Artículos (Zoología)

URI permanente para esta colecciónhttps://hdl.handle.net/11441/10929

Examinar

Mostrando 1 - 20 de 475

Environmental effects of maintenance dredging works in a highly modified estuary: A short-term approach
(Elsevier, 2024-11-01) Donazar Aramendia, Íñigo; Megina Martínez, César; Miro Recio-Mensaque, Juan Miguel; Florido Capilla, Marta; Reyes Martínez, M. J.; Olaya Ponzone, Liliana; García Gómez, José Carlos; Universidad de Sevilla. Departamento de Zoología
Dredging operations present significant environmental risks in estuaries, which can potentially result in alter- ations to the physicochemical parameters of water and sediment, as well as the biota of the ecosystem. The assessment of environmental impacts in estuaries is challenging due to the dynamic nature of these systems. Furthermore, the inconsistent findings in studies examining these impacts emphasize the necessity of a case-by- case approach for evaluating the environmental consequences. It is crucial to employ various temporal and methodological approaches to evaluate environmental impacts, draw valid conclusions, and propose suitable management measures. However, there is a limited availability of studies that investigate short-term ecological processes. Therefore, the objective of this study is to characterize the short-term responses of physicochemical characteristics in the water column and sediment, particularly focusing on the content of heavy metals, as well as the impacts on community structure. Additionally, the study aims to assess the suitability of stable isotope analysis in two species as bioindicators of nutrient enrichment. The findings of this research indicated no discernible impact from dredging activities on any of the evaluated physicochemical parameters in the water column, sediment, or biological communities. However, the nitrogen stable isotope signals of the goby Poma- toschistus sp. exhibited an effect associated with an increase in certain nutrient levels suggesting its suitability as a bioindicator of nutrient enrichment in human activities. Interestingly, a flood event prior to the latest survey had a more significant influence on all measured parameters compared to the dredging operation. Changes in salinity and other factors related to freshwater management in the Guadalquivir estuary may have a more substantial impact on soft-bottom communities than other pressures. Consequently, management efforts should be directed towards mitigating these pressures to foster more stable communities.
Evaluating Fish Foraging Behaviour on Non-indigenous Asparagopsis Taxiformis Using a Remote Video Foraging System
(Elsevier, 2024) Chebaane, Sahar; Engelen, Aschwin Hillebrand; Pais, Miguel Pessanha; Silva, Rodrigo; Gizzi, Francesca; Triay Portella, Raül; Florido Capilla, Marta; Monteiro, João Gama; Universidad de Sevilla. Departamento de Zoología; Fundação para a Ciência e a Tecnologia. Portugal; European Union (UE); Agência Regional para o Desenvolvimento da Investigação, Tecnologia e Inovação (ARDITI). Portugal
The proliferation of pest and invasive marine macroalgae threatens coastal ecosystems, with biotic interactions, including direct effects such as grazing and indirect effects such as the trophic cascades, where one species indirectly affects another through its interactions with a third species, play a critical role in determining the resistance of local communities to these invasions. This study examines the foraging behaviour and preference of native fish communities toward native (Halopteris scoparia, Sargassum vulgare) and non-indigenous (Asparagopsis taxiformis) macroalgae using the Remote Video Foraging System (RVFS). Fifty-four weedpops were deployed across three locations to present these macroalgae, while associated epifaunal assemblages were also collected. Video analysis revealed that four common fish species displayed preference towards native macroalgae, possibly due to by the presence of zoobenthos rather than herbivory. This observation suggests that these fish species identified the macroalgae as a habitat that harboured their preferred food items. In contrast, A. taxiformis was consistently avoided, suggesting limited integration into the local food web. Site-specific variations in fish-macroalgae interactions and epifaunal diversity highlighted the complexity of these dynamics. This study contributes to understanding of the ecological implications of invasive macroalgae and supports the use of RVFS as a tool for assessing local biotic resistance against non-indigenous species in coastal ecosystems globally.
Fin Whale Balaenoptera physalus Historical Sightings and Strandings, Ship Strikes, Breeding Areas and Other Threats in the Mediterranean Sea: A Review (1624–2023)
(Multidisciplinary Digital Publishing Institute (MDPI), 2024-05-21) Espada, Rocío; Camacho Sánchez, Adrián; Olaya Ponzone, Liliana; Martín Moreno, Estefanía; Patón, Daniel; García Gómez, José Carlos; Universidad de Sevilla. Departamento de Zoología
A review of the last 399 years (1624–2023) on fin whales (Balaenoptera physalus) in the Mediterranean Sea was conducted, based on an extensive compilation of records published in the scientific literature, technical reports, public databases, journals, and social media. A total of 10,716 sightings and 575 mortality events have been computed, analysed by semesters and mapped in order to compare the summer–winter seasons especially and their implications on migration–residence. Visual and acoustic detections, feedings, migrations, primary production areas (chlorophyll), threats and causes of death and their relations have been addressed, and a mini-review on heavy metals and pollutants has been carried out on fin whales in the Mediterranean Sea. Mortality events were most frequent between November and April, coinciding with the decreased sighting period. Ship strikes posed the greatest threat, peaking between May and October, when marine traffic tends to increase in the Mediterranean Sea. Two populations coexist in the Mediterranean Sea, one resident and the other migratory, the latter using the Strait of Gibraltar for its biannual movements. Two areas with a presence of calves (up to 7 m in length) between October and February were detected: one scattered in the northern Mediterranean and the Strait of Gibraltar and its surroundings. A critical zone for collisions has been established according to the results for fin whales in the Mediterranean Sea.
Understanding Carbon Footprint in Sustainable Land-Based Marine Aquaculture: Exploring Production Techniques
(MDPI, 2024-07-16) Castilla Gavilán, Marta; Guerra García, José Manuel; Hachero Cruzado, Ismael; Herrera, Marcelino; Universidad de Sevilla. Departamento de Zoología
In aquaculture, it is crucial to understand and mitigate the carbon footprint for sustainable production. As demand for seafood increases, various production techniques compete for an eco-friendly status. This review examines the carbon footprint of various land-based marine aquaculture systems, highlighting their environmental impact. Through exploring innovations and best practices, it navigates the complexities of reducing emissions and promoting carbon sequestration. Some proposals for this purpose are based on diversification through low-trophic-level species, the preservation of high-carbon sequestration sites, polyculture, organic aquaculture and improvements in nutrition, feeding, waste and energy management. In this sense, some land-based aquaculture systems are progressively adapting and updating their zootechnical procedures. Recirculating Aquaculture Systems (RASs) offer interesting advantages such as water conservation, pollution reduction and biosecurity. Integrated Multi-Trophic Aquaculture systems (IMTAs) aim to address two major issues in aquaculture: efficient water usage and the environmental impact of effluents, which are rich in organic particles and dissolved nutrients from undigested food and feces; hence, these systems involve cultivating multiple species (polyculture). Biofloc Technology (BFT) is based on the formation of bioflocs in a culture medium. These systems can enhance feeding efficiency and waste management, thus optimizing nutrient utilization and minimizing environmental impact, achieved through reduced water and fertilizer usage. Traditional (extensive) aquaculture systems operate with minimal input of feed and chemicals, relying heavily on the natural productivity of the ecosystems; thus, the need for manufactured feed, the environmental impact associated with feed production and the transportation and overall costs are significantly reduced. Overall, while RASs, BFT and extensive systems in general offer significant sustainability benefits, IMTA’s holistic approach to ecosystem management and nutrient recycling makes it, in our estimation, the most effective method in terms of ecological footprint in aquaculture. However, its quantitative evaluation is extremely complex, and there is currently a lack of references about its global carbon footprint. Therefore, further research and development are required, as well as collaboration and knowledge-sharing among stakeholders.
Microbiota and the volatile profile of avian nests are associated with each other and with the intensity of parasitism
(Oxford University Press, 2024-07-24) Mazorra Alonso, Mónica; Peralta Sánchez, Juan Manuel; Heeb, Philipp; Jacob, Staffan; Martín Vivaldi, Manuel; Martínez Bueno, Manuel; Soler, Juan José; Universidad de Sevilla. Departamento de Zoología; Ministerio de Ciencia e Innovación (MICIN). España; Agencia Estatal de Investigación. España; European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Bacteria have been suggested as being partially responsible for avian nest odours and, thus, volatiles from their metabolism could influence the intensity of selection pressures due to parasites detecting olfactory cues of their hosts. Here, we tested this hypothesis by exploring intraspecific and interspecific variability in microbial environments, volatile profiles and intensity of ectoparasitism by Carnus hemapterus in the nests of 10 avian species. As expected, we found that (i) alpha and beta diversity of microbial and volatile profiles were associated with each other. Moreover, (ii) alpha diversity of bacteria and volatiles of the nest environment, as well as some particular bacteria and volatiles, was associated with the intensity of parasitism at early and late stages of the nestling period. Finally, (iii) alpha diversity of the nest microbiota, as well as some particular bacteria and volatiles, was correlated with fledging success. When considering them together, the results support the expected links between the microbial environment and nest odours in different bird species, and between the microbial environment and both ectoparasitism intensity and fledging success. Relative abundances of particular volatiles and bacteria predicted ectoparasitism and/or fledging success. Future research should prioritise experimental approaches directed to determine the role of bacteria and volatiles in the outcomes of host–ectoparasite interactions.
Microalgae and phytase dietary supplementation improved growth and gut microbiota in juvenile European seabass (Dicentrarchus labrax)
(BioMed Central, 2024-09-06) Peralta Sánchez, Juan Manuel; Rabelo Ruiz, Miguel; Martín Platero, Antonio Manuel; Vizcaíno, Antonio Jesús; Flores Moreno, Sara; Macías Vidal, Judit; Martínez Bueno, Manuel; Universidad de Sevilla. Departamento de Zoología; Ministerio de Ciencia e Innovación (MICIN). España; Agencia Estatal de Investigación. España; European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER); Universidad de Almería; Ministerio de Ciencia, Innovación y Universidades (MICIU). España; European Union (UE). H2020
Fishmeal and fish oil have been the main sources of protein and fatty acid for aquaculture fish. However, their increasing price and low sustainability have led the aquafeed industry to seek sustainable alternative feedstuffs to meet the nutritional requirements of fish and improve their health and performance. Plant proteins have been successfully used to replace fishery derivatives in aquafeeds, but the presence of anti-nutritional substances is a potential drawback of this approach. Thus, it has been reported that phytate breakdown can be caused by feed supplementation with exogenous phytase. The inclusion of microalgae has been proposed to improve gut functionality in fish fed diets with a high vegetable protein content. The aim of this study was to evaluate the effect on the growth and gut microbiota of European seabass (Dicentrarchus labrax) juveniles of a diet containing a blend of microalgae (Arthrospira platensis and Nannochloropsis gaditana) and different concentrations of phytase. An 83-day feeding trial was conducted, comprising four experimental diets with 2.5% microalgae and 500, 1,000, 2,000, or 10,000 phytase units (FTU)/kg feed and a microalgae- and phytase-free control diet. At the end of the trial, a significantly increased body weight was observed in fish fed the diet with the highest phytase concentration (10,000 FTU/kg) versus controls, although the gut bacterial composition did not differ from controls in alpha or beta diversity with either majority (Weighted UniFrac) or minority bacterial strains (Unweighted UniFrac). In comparison to the control group, the groups fed diets with 1,000 or 2,000 FTU/kg diets had a lower alpha diversity (Shannon’s diversity index), while those fed diets with 500 FTU/kg or 1,000 FTU/kg showed distinct clusters in beta diversity (involving minority ASVs). According to these findings, the diet containing the 2.5% microalgae blend with 10,000 FTU/kg may be useful to increase the aquafeed quality and sustain the growth performance of juvenile European seabass.
Long-term anthropogenic drivers of diet composition and niche breadth in an endangered avian scavenger: The scant role of sanitary regulations
(Elsevier, 2024-10) De Tena, C.; Donázar Aramendía, Iñigo Javier; Ceballos, O.; Arrondo, E.; Cortés Avizanda, Ainara; Donázar, J. A.; Universidad de Sevilla. Departamento de Biología Vegetal y Ecología; Universidad de Sevilla. Departamento de Zoología; Ministerio de Ciencia, Innovación y Universidades (MICIU). España; Agencia Estatal de Investigación. España
The widespread and accelerated transformation experienced by our planet results in populations of endangered species having to survive in highly-altered environments and increasingly relying on resources provided by human subsidies. Presently, vultures rank among the most imperiled functional groups of large vertebrates globally, a situation that is largely attributed to the rapid intensification of agriculture and the subsequent transformation of farming practices and agro-grazing landscapes. Hence, documenting the long-term fluctuations in the vultures’ dietary patterns in response to environmental changes, particularly in livestock management, is of utmost significance. Here, by means of bulk stable isotope analysis (δ13C and δ15N), we examined long-term variations in diet composition and niche breadth in a population of the endangered Egyptian vulture (Neophron percnopterus) in the north of the Iberian Peninsula. We specifically focused on the effect of European sanitary regulations enacted in 2014, which allow sheep farmers to abandon livestock remains for consumption by scavenging birds, except for pig carcasses. We found that the implementation of these new regulations did not cause a change in the diet of vultures. Changes were only detected in scrubland areas and were driven by an increase in the consumption of wild rabbit which, in turn, lead to expansion of the trophic niche. These results indicate that these endangered vultures are heavily dependent on food sources derived from intensive farming, mostly of pigs illegally disposed in the wild, and moreover, highlight the importance of carcasses of small vertebrates, often disregarded in conservation programs in favor of the contribution of livestock remains. Our research provides valuable insights into the spatiotemporal dynamics of trophic strategies among avian scavengers, specifically in the context of changes resulting from intensified human-pressures on agro-grazing Mediterranean landscapes.
Variability of Faecal Microbiota and Antibiotic Resistance Genes in Flocks of Migratory Gulls and Comparison with the Surrounding Environment
(Elsevier, 2024) Jarma, D.; Sacristán Soriano, O.; Borrego, C. M.; Hortas, F.; Peralta Sánchez, Juan Manuel; Balcázar, J. L.; Green, A. J.; Alonso Álvarez, Esteban; Sánchez Melsió, A.; Sánchez Ordóñez, Marta Isabel; Universidad de Sevilla. Departamento de Química Analítica; Universidad de Sevilla. Departamento de Zoología; Gobierno de España; Ministerio de Ciencia, Innovación y Universidades (MICIU). España; Generalitat de Catalunya
Gulls commonly rely on human-generated waste as their primary food source, contributing to the spread of antibiotic-resistant bacteria and their resistance genes, both locally and globally. Our understanding of this process remains incomplete, particularly in relation to its potential interaction with surrounding soil and water. We studied the lesser black-backed gull, Larus fuscus, as a model to examine the spatial variation of faecal bacterial communities, antibiotic resistance genes (ARGs), and mobile genetic elements (MGEs) and its relationship with the surrounding water and soil. We conducted sampling campaigns within a connectivity network of different flocks of gulls moving across functional units (FUs), each of which represents a module of highly interconnected patches of habitats used for roosting and feeding. The FUs vary in habitat use, with some gulls using more polluted sites (notably landfills), while others prefer more natural environments (e.g., wetlands or beaches). Faecal bacterial communities in gulls from flocks that visit and spend more time in landfills exhibited higher richness and diversity. The faecal microbiota showed a high compositional overlap with bacterial communities in soil. The overlap was greater when compared to landfill (11%) than to wetland soils (6%), and much lower when compared to bacterial communities in surrounding water (2% and 1% for landfill and wetland water, respectively). The relative abundance of ARGs and MGEs were similar between FUs, with variations observed only for specific families of ARGs and MGEs. When exploring the faecal carriage of ARGs and MGEs in bird faeces relative to soil and water compartments, gull faeces were enriched in ARGs classified as High-Risk. Our results shed light on the complex dynamics of antibiotic resistance spread in wild bird populations, providing insights into the interactions among gull movement and feeding behavior, habitat characteristics, and the dissemination of antibiotic resistance determinants across environmental reservoirs.
Hidden gems: Scattered knowledge hampered freshwater jellyfish research over the past one-and-a-half centuries
(Wiley, 2024-09-29) Lüskow, Florian; Bezio, Nicholas; Caputo, Luciano; Chi, Xupeng; Dumont, Henri J.; Karunarathne, Krishan D.; López González, Pablo José; Pakhomov, Evgeny A.; Universidad de Sevilla. Departamento de Zoología; Natural Sciences and Engineering Research Council of Canada (NSERC)
Freshwater jellyfish (= limnic medusa-budding hydrozoans, FWJ) are a small group of cnidarians found on all continents except Antarctica in temperate to tropical latitudes. Members of this group belong primarily to three genera: Astrohydra, Craspedacusta, and Limnocnida. While Astrohydra and Limnocnida are typically restricted to the islands of Japan, Africa, and the Indian subcontinent, one species or potential species complex, Craspedacusta sowerbii, became globally invasive. Despite research going back about one-and-a-half centuries, little is known about their phylogeny and ecology compared to marine jellyfish. Recent species distribution modelling, however, showed that by 2050, C. sowerbii will potentially extend their distribution ranges due to global warming to high-latitude ecosystems and be present (medusa stage) for an extended time in the seasonal limnic production cycle. An increase in their relative ecological importance with temporal and spatial spreading is hypothesised. Only recently, it has been shown that the trophic roles of polyps and medusae and their prey overlap with other ecosystem members. In addition, medusa behaviour may cause trophic cascades and alter vertical nutrient distributions. However, polyps and other benthic life cycle stages are understudied. In globally, changing freshwater ecosystems that may become more accommodating for FWJ, an improved understanding of their population biology and ecosystem ecology is urgently needed. In this integrative review, we, therefore, explore reasons for the hampered historical research progress, contrast developments with those of marine cnidarians, compile and publish alongside an extensive and unprecedented literature database, and formulate avenues for future directions in FWJ research.
Genomic, morphological and physiological data support fast ecotypic differentiation and incipient speciation in an alpine diving beetle
(Wiley, 2024-08-07) Pallarés Párraga, Susana; Ortego, Joaquín; Carbonell Hernández, José Antonio; Franco Fuentes, Eduardo; Bilton, David T.; Millán, Andrés; Abellán Ródenas, Pedro; Universidad de Sevilla. Departamento de Zoología; Ministerio de Ciencia e Innovación (MICIN). España; Agencia Estatal de Investigación. España; Universidad de Sevilla
An intricate interplay between evolutionary and demographic processes has frequently resulted in complex patterns of genetic and phenotypic diversity in alpine lineages, posing serious challenges to species delimitation and biodiversity conservation planning. Here we integrate genomic data, geometric morphometric analyses and thermal tolerance experiments to explore the role of Pleistocene climatic changes and adaptation to alpine environments on patterns of genomic and phenotypic variation in diving beetles from the taxonomically complex Agabus bipustulatus species group. Genetic structure and phylogenomic analyses revealed the presence of three geographically cohesive lineages, two representing trans-Palearctic and Iberian populations of the elevation-generalist A. bipustulatus and another corresponding to the strictly-alpine A. nevadensis, a narrow-range endemic taxon from the Sierra Nevada mountain range in southeastern Iberia. The best-supported model of lineage divergence, along with the existence of pervasive genetic introgression and admixture in secondary contact zones, is consistent with a scenario of population isolation and connectivity linked to Quaternary climatic oscillations. Our results suggest that A. nevadensis is an alpine ecotype of A. bipustulatus, whose genotypic, morphological and physiological differentiation likely resulted from an interplay between population isolation and local altitudinal adaptation. Remarkably, within the Iberian Peninsula, such ecotypic differentiation is unique to Sierra Nevada populations and has not been replicated in other alpine populations of A. bipustulatus. Collectively, our study supports fast ecotypic differentiation and incipient speciation processes within the study complex and points to Pleistocene glaciations and local adaptation along elevational gradients as key drivers of biodiversity generation in alpine environments.
Year-round Carryover Effects are Driven by Migration Phenology for Hirundo Rustica (Barn Swallow) Wintering in West Africa
(Oxford, 2024) López Calderón, Cosme; Magallanes, S.; García Longoria, Luz; Marzal, A.; Balbontín Arenas, Javier; Universidad de Sevilla. Departamento de Zoología; Junta de Andalucía; Ministerio de Economía y Competitividad (MINECO). España; Junta de Extremadura
Recently, population declines have been reported for many migratory birds. Because of complex life cycles, determining the causes for such declines is often difficult. Thus, migratory birds are of special conservation interest. We studied the migratory behavior of Hirundo rustica (Barn Swallow) tagged with solar geolocators and determined carryover effects during the entire annual cycle from one breeding season to the next. We used a partial least squares path model (PLS-PM) to disentangle migratory and breeding events that occur in chronological order. In addition, we controlled for broad environmental conditions in the wintering grounds (NDVI and latitude) and the specific molting habitat (δ13C). We did not find a carryover effect from reproduction investment in the attachment year to breeding success in the subsequent year. Individuals that invested more in reproduction departed earlier from the breeding colonies, but this in turn did not affect the onset of autumn migration. Thus, the premigratory period should be acting as a buffer stage counteracting any previous carryover effects from reproduction investment. On the other hand, we found a long-lasting domino effect from the onset of autumn migration to subsequent breeding success, consistent with the notion of a migratory race. Specifically, individuals which started earlier in the autumn migration arrived earlier to the wintering grounds, started earlier in the spring migration arrived earlier to the breeding colonies, and had a higher breeding success. We highlight that the premigratory period (i.e., the time elapsed between departure from breeding areas and the onset of autumn migration) should be important for the life cycle of migratory species, but it has been frequently overlooked.
Marine artificial micro-reserves: a possibility for the conservation of endangered species living on artificial substrata
(Wiley, 2010-10-12) García Gómez, José Carlos; López-Fé de la Cuadra, Carlos María; Espinosa Torre, Free; Guerra García, José Manuel; Universidad de Sevilla. Departamento de Zoología
The installation of urban and commercial infrastructures on the coast has a severe impact on the marine environment. This impact is mostly negative but, simultaneously, some of the species that colonize artificial substrata (sometimes rare or threatened) find refuge in man-made structures. The protection of endangered species is usually provided by marine protected areas or by laws that punish their damage or collection, but effective enclosure and custody must be achieved in the case of easily accessible intertidal species. We used the ferruginous limpet, Patella ferruginea, as a case study because it is the most endangered invertebrate in the Mediterranean. This species, which lives in the intertidal zone and is very accessible to people, is a free-spawning, protandric hermaphrodite, highly dependent on population density and individual size for its reproductive success. Previous work by the authors found the species is especially abundant on artificial substrates on both shores of the Strait of Gibraltar, where people collect fewer of them. Spanish laws of coastal management do not allow the enclosure of the natural coastline, but artificial installations like harbour breakwaters may be closed or guarded, and visits for educational purposes may be carried out under control. The possibility of declaring some kind of environmental protection for these artificial areas would be a very helpful tool for conservation and management purposes. Protected individuals would grow larger and eventually produce exponentially more offspring, which could be transported by currents to adjacent habitats. Here we propose a protection concept for artificial sites termed Artificial Marine Micro-Reserve (AMMR), where some endangered species experience a refuge from human disturbance. This concept is a modification of the land micro-reserves that have been recently declared in small natural sites that keep rare plant species. A network of AMMRs would be the final objective, allowing the creation of a great metapopulation of P. ferruginea and also giving refuge to other endangered species that have been found to grow in this type of substratum. Critically, the declaration of a micro-reserve cannot be used as a reason in favour of new construction because of the negative influence of such structures on the marine environment, together with the fact that there is no certainty that valuable species will settle on them.
Some bathyal cheilostome Bryozoa (Bryozoa, Cheilostomata) from the Canary Islands (Spain, Eastern Atlantic), with descriptions of three new species, a new genus, and a new family
(Taylor and Francis Group, 2006) López-Fé de la Cuadra, Carlos María; Universidad de Sevilla. Departamento de Zoología
Five bathyal species of cheilostome Bryozoa have been found on a submarine volcano off the Canary Islands, on dead skeletons of the madreporarian Madrepora oculata Linnaeus. Three of them are new to science. For one species, the introduction of a new genus and family is necessary. In addition, the generic assignation of Cribrilina alcicornis Jullien is revised, including this species in Distansescharella d’Orbigny. Tessaradoma boreale (Busk) is cited for the first time from the Canary Islands.
Artificial Marine Micro-Reserves Networks (AMMRNs): an innovative approach to conserve marine littoral biodiversity and protect endangered species
(Willey, 2014-05-16) García Gómez, José Carlos; Guerra García, José Manuel; Espinosa Torre, Free; Maestre Delgado, Manuel Jesús; Rivera Ingraham, Georgina Alexandra; González, Alexander R.; Ruiz Tabares, Aurora; López-Fé de la Cuadra, Carlos María; Universidad de Sevilla. Departamento de Zoología
Coastal engineering works, especially the outer breakwaters of ports where environmental conditions are usually good, often constitute new habitats for marine littoral species. Their potential indirect contribution to the regeneration and conservation of protected species opens up a new perspective in protection of marine biodiversity. This is particularly true when these works harbour, as we show here, important reproductive populations of species that are threatened or even in danger of extinction. We provide integrated data on protected marine species in Southern Iberia established on different substrata (quarried dolomitic rocks, concrete cubic blocks, concrete tetrapods and vertical concrete walls) that are used in the construction of artificial levees that could potentially be Artificial Marine Micro-Reserves (AMMRs). We also present the first evidence of the ‘reserve effect’ in potential AMMRs and we discuss the need for the creation of AMMRs including their effective networking (AMMRNs), supporting data for which has been observed by studying coastal facilities subjected to strict access restrictions (for security reasons, not conservation). These facilities have acted as valuable proxies and, in reality, potentially act as AMMRs, as well as having a role in helping to detect and control invasive species. We discuss the ecological engineering aspects related to the design and type of materials used in coastal constructions with a view to aiding the integration of these into existing coastal ecosystems as well as promoting greater settlement of species and therefore increases in biodiversity. Finally, the environmental implications of AMMRNs within the future implementation strategy of the Water Framework Directive 2000/60 EC are also discussed.
Influence of fouling communities on the establishment success of alien caprellids (Crustacea: Amphipoda) in Southern Spain
(Taylor and Francis Group, 2012-12-03) Ros Clemente, Macarena; Guerra García, José Manuel; González Macías, Manuel; Saavedra, Ángela; López-Fé de la Cuadra, Carlos María; Universidad de Sevilla. Departamento de Zoología; Ministerio de Educación. España; European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER)
Recently, two non-native caprellid amphipods, Caprella scaura and Paracaprella pusilla, were found for the first time in southern Spain. In order to assess their establishment success, monitoring of the caprellid fauna associated with the marina's fouling community was carried out from summer 2010 to spring 2011 in Cádiz marina, southern Spain. Three caprellid species were found, the non-native C. scaura and P. pusilla, and the native Caprella equilibra. Caprella scaura was the dominant species with ovigerous females and juveniles throughout the whole study period, reflecting both that it reproduces all year around and that it is able to support the differences measured in water temperature, salinity and turbidity among seasons. It showed a high ability to colonize different fouling substrates, although it was significantly more abundant in the introduced bryozoan Bugula neritina. The tropical caprellid P. pusilla was found in lower abundance than C. scaura as it only was present in summer, associated exclusively with the native hydroid Eudendrium racemosum. The native C. equilibra, very common in other nearby harbours where alien caprellids were absent, was scarcely represented in the study area. The results suggest first that P. pusilla is an introduced species with less invasiveness than C. scaura, and second, that fouling bryozoans, especially B. neritina, are suitable habitat for the establishment success of C. scaura, harbouring high densities of this invasive species, while fouling hydroids, particularly in the case of the native hydroid E. racemosum, are more suitable for the establishment success of P. pusilla.
The Cheilostomate Bryozoa (Bryozoa : Cheilostomatida) collected by the Spanish 'Antartida 8611' expedition to the Scotia Arc and South Shetland Islands
(Taylor and Francis Group, 2010-12-03) López-Fé de la Cuadra, Carlos María; García Gómez, José Carlos; Universidad de Sevilla. Departamento de Zoología; Comisión Interministerial de Ciencia y Tecnología (CICYT). España
The Cheilostome Bryozoa of the ‘Antartida 8611’ Expedition, collected by the Spanish Oceanographic Institution (Instituto Espanol de Oceanografia, IEO) during the Antarctic summer 1986–87 are listed. This expedition collected abundant material of benthic invertebrates at many stations in the Scotia Sea archipelagos and South Shetland Islands, of which 70 yielded Cheilostomate Bryozoa. Of 85 species found, 32 have been collected in areas where they were not previously known. Twenty of them are recorded north of their known limit of distribution and two recorded south. Most of these species are cited for the first time for the Scotia Arc, thus supporting the generally admitted homogeneity of the Antarctic fauna. The presence of Arachnopusia monoceros in the Southern Ocean is confirmed; a previously unknown variability in the colony shape of Kymella polaris is reported and the ovicell of Exochella umbonata is described. In addition, four species have been proposed as new to science, three of them, belonging to the genera Cellaria, Klugerella and Hippomonavella, described in the present work and one, Macropora georgiensis, included in a previous work. Together with the discussion of the new species of Klugerella, the specific composition of this genus is updated, with the assignation of Membraniporella aragoi (Audouin) and Membraniporella marcusi Cook to Klugerella. The examination of the inner side of the orifice and the frontal wall of three species of Hippomonavella reveals that the frontal is at least partially umbonuloid and that this genus is better accommodated in the family Bitectiporidae MacGillivray, 1895 than in Smittinidae Levinsen, 1909. Se presenta un listado de los Briozoos Queilostomados obtenidos en la campana ‘Antartida 8611’ del Instituto Espanol de Oceanografia (IEO) durante el verano antartico de 1986-87. Esta expedicion recolecto un abundante material de invertebrados bentonicos en un alto numero de estaciones de los archipielagos del arco del Scotia y las islas Shetland del Sur, de las cuales 70 contenian briozoos. De las 85 especies encontradas, 32 se han recogido en areas en las que no eran conocidas previamente. De ellas, 22 aumentan hacia el norte su limite de distribucion y dos hacia el sur. Muchas de estas especies se citan por primera vez en el arco del Scotia, corroborando la generalmente admitida homogeneidad de la fauna antartica. La presencia de Arachnopusia monoceros en aguas antarticas, que habia sido puesta en duda, se confirma; se describe una variabilidad antes no conocida de la forma colonial de Kymella polaris, asi como la ovicela de Exochella umbonata, que no habia sido encontrada. Ademas, cuatro especies se han propuesto como nuevas para la Ciencia, de las que tres, pertenecientes a los generos Cellaria, Klugerella e Hippomonavella, se describen en este trabajo, y la otra, Macropora georgiensis, se ha incluido en una revision del genero publicada anteriormente. En la discusion de la nueva especie de Klugerella, se actualiza la composicion especifica de este genero, anadiendo al mismo Membraniporella aragoi (Audouin) y Membraniporella marcusi Cook. Se pone de manifiesto que la pared frontal de Hippomonavella es al menos parcialmente umbonuloide y, dadas las caracteristicas de dicha pared y del orificio, se propone que el genero Hippomonavella esta mejor situado en la familia Bitectiporidae MacGillivray, 1895 que en Smittinidae Levinsen, 1909.
Environmental consequences of dredged-material disposal in a recurrent marine dumping area near to Guadalquivir estuary, Spain
(Elsevier, 2020-12) Donázar Aramendía, Iñigo Javier; Sánchez Moyano, Juan Emilio; García Asencio, Isabel; Miró Recio-Mensaque, Juan Miguel; Megina Martínez, César; García Gómez, José Carlos; Universidad de Sevilla. Departamento de Zoología; Universidad de Sevilla
In this study we assessed the effects of the recurrent disposal of dredged material from the Guadalquivir estuary (south-western Spain) in a marine disposal area. We analysed shifts in sediment characteristics as well as bioaccumulation and biomagnification of heavy metals through the benthic food web. Results showed that the significant increase in concentration of some heavy metals observed in the marine disposal area after the latest disposal event could be attributed to the deposition of river-dredged sediments. This increase could also explain the decreased amphipod survival in the ecotoxicology analysis. Heavy metal concentrations in organisms indicated some bioaccumulation in deposit feeders and predators but with no clear patterns nor biomagnification through the food web. Hence, combining studies that monitor shifts in sediment characteristics and their possible consequences for the food web seems to be an interesting approach that should be assessed further in this type of studies.
Habitat-complexity Regulates the Intensity of Facilitation along an Environmental Stress Gradient
(John Wiley & Sons, 2022) Navarro Barranco, Carlos; Gribben, Paul E.; Ledet J, Janine; Alistair Poore, G.B.; Universidad de Sevilla. Departamento de Zoología
Positive interactions between foundation species and their associated species are expected to be influenced by the degree of environmental stress as well as trait variations of the species involved. However, there is scarce empirical evidence regarding how these two factors interact and shape the intensity of facilitation. To test how facilitation varies with stress, a colonization experiment using artificial algal units that varied in a functional trait (morphological complexity) was conducted at different intertidal height levels. The isolated effects of shore-height and host-complexity are as expected: the number of species and overall abundance of epifauna decreased with lower complexity host units and greater exposure to environmental stress. However, in contrast to the initially proposed model, based on the stress gradient hypothesis, the magnitude of positive interactions increased at lower tidal heights (those levels with, presumably, milder environmental conditions). An additional predation exclusion experiment ruled out the effects of predation pressure as a major factor driving the structure of mobile epifaunal assemblages in these intertidal habitats. Thus, further studies are needed to identify the factors that explain the patterns of facilitation intensity found in the present study.
Evaluating the Vulnerability of Coralligenous Epifauna to Macroalgal Invasions
(John Wiley & Sons, 2021) Navarro Barranco, Carlos; Moreira, Juan; Espinosa Torre, Free; Ros Clemente, Macarena; Rallis, Ioannis; Sempere Valverde, Juan; Ostalé Valriberas, Enrique; Altamirano, María; García Gómez, José Carlos; Guerra García, José Manuel; Universidad de Sevilla. Departamento de Zoología
This work constitutes the first comprehensive study of the epifaunal response to biological invasions in coralligenous habitats, which are one of the main hotspots of biodiversity in the Mediterranean. The epifaunal community inhabiting the invasive macroalga Rugulopteryx okamurae and other dominant sessile hosts on coralligenous habitats (i.e. the sponge Spongia lamella, the gorgonian Paramuricea clavata, and the macroalga Sphaerococcus coronopifolius) was characterized. A total of 137 taxa were found. There was a lack of functional equivalence between macroalgal species (both native and invasive) and sessile invertebrates. Despite the absence of significant differences in mean density values and number of species per replicate among host species, epifaunal composition on gorgonians and sponges differed significantly from that on both macroalgae. Epifaunal assemblages, especially those inhabiting macroalgal species, were dominated by generalist detritivorous species that can inhabit different hosts, while specialized interactions between mobile epifauna and sessile hosts were observed almost exclusively on sessile invertebrates. Moreover, epifaunal community associated with invertebrate hosts showed higher spatial heterogeneity in comparison with native and invasive macroalgae. A competitive displacement of native hosts by the spreading of R. okamurae on coralligenous habitats would likely result in a biotic impoverishment in terms of overall number of species and a taxonomical and functional homogenization of the epifaunal community. Specialist species with a heterogeneous distribution could be gradually replaced by a spatially homogeneous assemblage dominated by generalist species.
Understanding the Effects of Coastal Defence Structures on Marine Biota: The Role of Substrate Composition and Roughness in Structuring Sessile, Macro- and Meiofaunal Communities
(Elsevier, 2020) Sedano Vera, Francisco; Navarro Barranco, Carlos; Guerra García, José Manuel; Espinosa Torre, Free; Universidad de Sevilla. Departamento de Zoología; Ministerio de Educación, Cultura y Deporte (MECD). España
The increasing deployment of artificial structures into the marine environment is creating new hard substrates that differ from natural ones in physical and biological aspects. However, studies of macrofaunal and meiofaunal communities associated with artificial structures are very limited. Seawalls, cubes, acropods and rip-raps in Algeciras Bay (southern Spain) were each compared with the nearest natural hard substrate and their community structure was related to substrate roughness, composition, carbonates content, crystallinity and age, using db-RDA. The results showed clear differences between substrates for the three community levels (sessile, macro- and meiofauna). Overall, rip-raps were the most similar to natural substrates. Under similar environmental conditions, substrate roughness, composition (only for sessile) and age of the structures seemed to play important roles in structuring those communities. They especially affected the sessile community, initiating strong cascading effects that were detectable at high taxonomic level in the associated fauna.

Examinar

Envíos recientes