Aquatic Conservation-Marine and Freshwater Ecosystems最新文献

{"title":"Towards an Abundance Estimate for New Zealand Fur Seal in New Zealand","authors":"Alasdair A. Hall,&nbsp;B. Louise Chilvers,&nbsp;Jody Suzanne Weir","doi":"10.1002/aqc.70142","DOIUrl":"https://doi.org/10.1002/aqc.70142","url":null,"abstract":"<p>A lack of population abundance and trajectory data is a conservation and management issue relevant to numerous pinniped species, many of which are exposed to a variety of threats. New Zealand fur seal (<i>Arctocephalus forsteri</i>; ‘NZFS’) populations in different parts of New Zealand have experienced both substantial increases and decreases to their abundance over the last 50 years, since the last nationwide census. Here, existing data and stage-structured matrix modelling were used to provide a contemporary nationwide estimate of NZFS abundance. Graphical depictions demonstrate the spatial inconsistencies in NZFS monitoring in New Zealand through time. A minimum population estimate of 131,338–168,269 NZFS was calculated by combining the most recently available pup production data from around New Zealand and using established multipliers. A second estimate of 181,646–239,473 NZFS was calculated using stage-structured matrix models to project contemporary abundance. Inconsistent NZFS population monitoring and sparse vital rate data for New Zealand's NZFS limited this study, and both population ranges are likely underestimates. However, they still represent substantial increases on the most cited nationwide abundance figure (100,000 NZFS). From these findings, we suggest that a regularised program of monitoring is adopted for New Zealand's NZFS, as has been achieved for similar species in other countries. This would both aid in the management of NZFS in the face of emerging risks, such as H5N1 avian influenza, and enable their use as a sentinel for the health of New Zealand's marine ecosystems.</p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.70142","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143865933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Natural History and Conservation Status of the Endangered Andean Water Frog Telmatobius fronteriensis in Northern Chile","authors":"Gabriel Lobos,&nbsp;Nicolás Rebolledo,&nbsp;Jesús Cornejo-Campos,&nbsp;Pablo Fibla,&nbsp;Paola A. Sáez,&nbsp;Claudio Azat,&nbsp;Gabriela Sáez,&nbsp;Marco A. Méndez","doi":"10.1002/aqc.70137","DOIUrl":"https://doi.org/10.1002/aqc.70137","url":null,"abstract":"<div>\u0000 \u0000 <p><i>Telmatobius fronteriensis</i> is a microendemic species from the arid Puna of northern Chile and is currently classified as Critically Endangered by the IUCN Red List. Here, we provide ecological information for <i>T. fronteriensis</i>. We evaluated its microhabitat, density, biometry, diet, presence of emerging pathogens, temporal changes in its habitat and conservation status. The habitat of <i>T. fronteriensis</i> is restricted to a small thermal-water stream in its type locality, covering a total area of 2.7 km². The species has a moderate density, with no differences in body condition between males and females across seasons. The diet varied between seasons, as did the preference for certain prey items. There is an apparent absence of <i>Batrachochytrium dendrobatidis</i> and Ranavirus. The information obtained is valuable for the management and conservation of this microendemic species, considering that water use pressure and mining activities are the primary threats to this Andean water frog. Future actions should consider the implementation of a binational conservation plan, as well as in situ and ex situ conservation programs to protect the species.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143857067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Skin Marks in Capitoline Dolphins Shed Light on Threats to the Population at the Tiber River Estuary (Mediterranean Sea)","authors":"Alice Turchi,&nbsp;Giulia Pedrazzi,&nbsp;Alex Mattiussi,&nbsp;Maria Silvia Labriola,&nbsp;Daniele Petrone,&nbsp;Sofia Rinalduzzi,&nbsp;Giancarlo Giacomini,&nbsp;Daniela Silvia Pace","doi":"10.1002/aqc.70135","DOIUrl":"https://doi.org/10.1002/aqc.70135","url":null,"abstract":"<p>The analysis of skin marks and lesions is used for many cetacean species to assess the general health status of the populations with the purpose of developing effective conservation strategies. This study applies mark analysis to characterise common bottlenose dolphin (<i>Tursiops truncatus</i>) skin marks and lesions, and their variation at the individual level across years, in the Tiber River Estuary area (Mediterranean Sea, Italy), to test their efficacy as proxies of individual or population health. Using high-quality photographic data collected between 2016 and 2023 during 205 sightings, marks were identified, classified, counted and measured on 39 individuals photographed on multiple occasions. Marks related to intraspecific interactions (e.g. tooth-rakes), anthropogenic activities (e.g. signs of interaction with fishery) and health conditions (e.g. skin diseases and emaciation) were selected as indicators, and five indices were applied to estimate their extension and progression through time. Prevalent marks in all individuals were of social origin and aggressive nature. Marks related to skin diseases and emaciation were present in 97% and 70% of individuals, respectively. Almost half of the individuals showed physical signs of interaction with fishing gears. No significant temporal trends were observed. These results highlight that the local population is under the pressure of multiple stressors, mostly related to human activities, both directly (fishing) and indirectly (malnutrition, aggression). The consequences of stressor interactions may be complex to predict and raise challenges for the conservation of this protected species—and of the ecosystem it belongs to—in a highly anthropised and currently unmanaged area.</p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.70135","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143857080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"New York Timeshare: Staggered Habitat Use of Small Cetaceans in the New York–New Jersey Harbour Estuary","authors":"Sarah G. Trabue,&nbsp;Melinda L. Rekdahl,&nbsp;Carissa D. King-Nolan,&nbsp;Howard C. Rosenbaum","doi":"10.1002/aqc.70115","DOIUrl":"https://doi.org/10.1002/aqc.70115","url":null,"abstract":"<div>\u0000 \u0000 <p>Sympatric species that occupy similar niches use a variety of strategies to minimise competitive exclusion. Bottlenose dolphins and harbour porpoises are both small cetaceans that occur in coastal areas and, in many areas where there is overlap, have been shown to use the habitat in different ways or at different times. In the New York–New Jersey Harbour Estuary (NY–NJ Harbour Estuary), bottlenose dolphins and harbour porpoises are found seasonally. We used passive acoustic monitoring to compare the acoustic presence of dolphins and porpoises from October 2018 to October 2020 in the NY–NJ Harbour Estuary, which revealed spatiotemporal differences in habitat use between the two species. The peak in acoustic presence for bottlenose dolphins occurred during summer and autumn, while porpoises were primarily detected during winter and spring. Porpoises were more acoustically active during the daytime, with some variability across months, while dolphins were consistently more active at night. Generally, dolphins were more commonly detected than porpoises, but porpoises were detected more often in the Upper Bay where bottlenose dolphin detections were rare. Dolphins and porpoises were more acoustically active around ebb and slack tides, respectively. Establishing baselines for species occurrence and identifying possible ecological influences on spatiotemporal patterns is important and time-sensitive given current and forthcoming anthropogenic activities, including activities related to offshore wind development.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143857151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of Taxonomic and Functional Diversity of Mayfly Assemblages Along the Course of a Large European River","authors":"Marina Vilenica,&nbsp;Bojana Tubić,&nbsp;Krešimir Žganec,&nbsp;Andreja Brigić,&nbsp;Lea Ružanović,&nbsp;Nataša Popović,&nbsp;Momir Paunović","doi":"10.1002/aqc.70139","DOIUrl":"https://doi.org/10.1002/aqc.70139","url":null,"abstract":"<p>Large rivers are complex freshwater systems with high habitat heterogeneity providing home and resources for numerous species. Even though they are considered biodiversity hotspots, our knowledge about the ecological requirements of inhabiting biota is still not sufficient. In this study, we investigated mayfly assemblages along the course of a large European river, Sava, with the main aim of identifying their taxonomic and functional diversity patterns along the river's course, as well as their relationship with environmental variables (water parameters and land use). A total of 29 mayfly species were recorded. We observed a downstream decreasing gradient in mayfly taxonomic assemblage metrics, influenced by habitat characteristics and anthropogenic pressures. Mayfly assemblages were highly determined by altitude, distance from the source and water parameters, such as temperature and conductivity. Higher taxa richness and abundance were recorded in colder upstream sections compared to downstream ones, characterized by higher conductivity (and higher anthropogenic impact). However, functional diversity was comparable along the river's course, with distinct traits compensating for each other and maintaining overall functional complementarity. Despite the present human impacts, some rare and sensitive species, such as <i>Ephoron virgo</i>, were recorded in the lower section of the studied river, indicating its conservation value. Hence, our study highlights the need for conservation measures for large rivers and the protection of the rare species they provide habitat for.</p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.70139","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143852679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pathogen and Gene Expression Profiles of Atlantic Salmon From an Endangered Population","authors":"Robert J. Lennox,&nbsp;Angela D. Schulze,&nbsp;Kristi M. Miller,&nbsp;Trond Einar Isaksen,&nbsp;Eirik Straume Normann,&nbsp;Cecilie Iden Nilsen,&nbsp;Lotte S. Dahlmo,&nbsp;Bjørn T. Barlaup,&nbsp;Elisabeth Stöger,&nbsp;Sindre H. Eldøy,&nbsp;Knut Wiik Vollset","doi":"10.1002/aqc.70131","DOIUrl":"https://doi.org/10.1002/aqc.70131","url":null,"abstract":"<p>The role of pathogens in impacting the behaviour and fate of salmonids has been studied extensively for some selected pathogens such as sea lice. However, the whole pathobiome of the fish are seldom considered and may confound and influence the study species in situ. In this study, we investigated the presence of pathogens in returning adult wild and hatchery salmon in the river Vosso using gill samples analysed in high-throughput PCR with a selection of assays targeting different fish pathogens. In addition, the samples were analysed for gene expressions that have been previously linked to imminent mortality, thermal stress, and inflammation related biomarkers. These data were linked to the behaviour of the individual fish collected from acoustic telemetry tags inserted in the abdomen of the fish. Previous analyses have suggested that the behaviour of the hatchery and wild salmon in this study area is different; however, there was no evidence that the pathobiome or the gene expression of the two groups of salmon (39 wild and 14 hatchery) could explain the behavioural differences between these two groups. Furthermore, neither pathogen profile nor gene expressions had a significant relationship between metrics of behaviour or survival of the fish. Results suggest that gene expression and pathogen screenings are insufficient to predict fates of migrating salmon. The Vosso salmon is a threatened population in Norway after collapsing in the 1980s; these data contribute to ongoing efforts to identify factors that are limiting the recovery of this population after decades of poor returns.</p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.70131","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Detecting Threatened Ichthyofauna in a Mediterranean Intensive Agricultural Landscape: From DNA Traces to Electrofishing","authors":"Panagiota Xanthopoulou,&nbsp;Argyrios Sapounidis,&nbsp;Paraskevi Papadopoulou,&nbsp;Fotios Arapoglou,&nbsp;Georgia Kalantaridou,&nbsp;Chrysoula Gubili","doi":"10.1002/aqc.70132","DOIUrl":"https://doi.org/10.1002/aqc.70132","url":null,"abstract":"<div>\u0000 \u0000 <p>Intensive agriculture and farming activities, industry, as well as human settlement can seriously affect freshwater ecosystems and the species they host. These disturbances have been previously monitored using traditional catch surveys. New methods, such as environmental DNA (eDNA) metabarcoding, can significantly improve biodiversity mapping by accessing rarely visited areas and by enhancing detection of rare and invasive species. We conducted an eDNA survey in a complex river and tributary system at Tenagi, Philippi that hosts approximately 12.5% of Greek freshwater ichthyofauna. A primer pair targeting the 12S rRNA was used to analyse eDNA samples from 30 sites. A reference sequence database was generated to improve regional diversity monitoring of endemic, native and invasive fishes. Results were compared with data collected using electrofishing from stations that allowed access. Two endemic, three invasive, two translocated and 10 native species were detected in their current known distribution using both methods. Overall, eDNA metabarcoding being more sensitive, consistently detected more freshwater species than traditional methods on a single fieldwork expedition. Co-occurrence of species was also investigated for the first time, revealing minor variations in species composition within fish communities. Stations in intensive agricultural zones with potentially high accumulation of organic and inorganic pollutants (Tributary D), exhibited lower number of reads and species richness than other tributaries at Tenagi. Our results demonstrate the need for complementary use of both eDNA metabarcoding and electrofishing to assess fish assemblages in freshwater habitats, as a combined approach can address reliability issues and biases associated with each method.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fish Diversity Patterns and Their Responses to Environmental Factors in a Global Biodiversity Hotspot","authors":"Yi Zhou,&nbsp;Hongfei Hu,&nbsp;Chongguang Chen,&nbsp;Manli Qian,&nbsp;Chaohui Feng,&nbsp;Bin Bao,&nbsp;Xiongjun Liu,&nbsp;Shan Ouyang,&nbsp;Xiaoping Wu","doi":"10.1002/aqc.70129","DOIUrl":"https://doi.org/10.1002/aqc.70129","url":null,"abstract":"<div>\u0000 \u0000 <p>Biodiversity loss has increased interest in understanding biodiversity patterns and their driving mechanisms in global. A growing of empirical evidence suggests that, in addition to purely species diversity, studies of phylogenetic diversity can provide distinct but complementary information about biodiversity patterns and their driving mechanisms. However, there was still a lack of research on integrating species and phylogenetic diversity to analyse the spatial patterns and driving mechanisms of fish diversity. Here, we evaluated the response of species diversity and phylogenetic diversity of fish assemblages to environmental factors in Jiangxi Province. The results showed that 243 fish species were recorded in Jiangxi province, including 14 invasive species. There were 126 species native to China and 33 species endemic to the Yangtze River Basin. The Red List of China and IUCN assessments showed that 31 (12.8%) and 16 (6.6%) species were Threatened or Near Threatened (1 Extinct; 6 and 1 Critically Endangered; 3 and 3 Endangered, 8 and 5 Vulnerable, 14 and 6 Near Threatened), respectively. The number of species in carnivorous (111), demersal (143) and resident (153) fish were higher than other functional taxa. Fish species diversity was not significantly spatial differences (<i>p</i> = 0.521), and phylogenetic diversity exhibited significantly spatial differences (<i>p</i> = 0.001). The species spatial turnover (0.53) was higher than the nestedness (0.17), a larger number of protected areas would be necessary to conserve the regional biodiversity. Environmental and geographic factors generally had no significant effect on the species and phylogenetic diversity, and only nitrate nitrogen was significantly correlated with the species diversity and phylogenetic diversity. The results highlight the importance of evaluating both species and phylogenetic diversity when identifying biodiversity patterns and their driving mechanisms and provide useful implications and guidance for biodiversity conservation in the Yangtze River and in other regions facing human disturbances.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143836151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ocean Acidification Research on Ecologically and Economically Important Sea Cucumbers Is Limited Globally","authors":"Samson Job,&nbsp;Amrit Kumar Mishra","doi":"10.1002/aqc.70128","DOIUrl":"https://doi.org/10.1002/aqc.70128","url":null,"abstract":"&lt;p&gt;Ocean acidification (OA) caused by increasing levels of partial pressure of carbon dioxide (CO&lt;sub&gt;2&lt;/sub&gt;) and subsequent changes in seawater carbonate chemistry exerts knock-on effects on various calcifying organisms. However, little is known about the echinoderms (e.g., sea cucumbers) that are being overexploited globally for economic benefits. Most importantly, less is known about the impacts of OA on these organisms. Within this framework, the current study synthesized the available global data on the effects of OA on various sea cucumber species. Results indicate studies on OA impacts on sea cucumbers are limited to 10 species across eight countries globally, with &lt;i&gt;Apostichopus japonicus&lt;/i&gt; being highly utilized under experimental conditions. Our results suggest that OA impacts reproduction, spawning events and sperm flagellar motility of sea cucumbers under low pH. This leads to the loss of energy allocations and reduction in somatic growth. Under low pH, the effects on Ca&lt;sup&gt;2+&lt;/sup&gt; and Mg&lt;sup&gt;2+&lt;/sup&gt; composition of calcareous ring and ossicles were species-specific and enzymatic activity was reduced. This study highlights the existing gaps that need to be addressed to prevent various knock-on effects of OA on sea cucumbers. This information is critical to managers and conservationists to manage the globally declining sea cucumber populations.&lt;/p&gt;&lt;p&gt;Ocean acidification (OA) caused by the unprecedented increase of atmospheric carbon dioxide (CO&lt;sub&gt;2&lt;/sub&gt;) levels and subsequent changes in seawater carbonate chemistry is one of the pressing environmental challenges of the 21st century (Jiang et al. &lt;span&gt;2019&lt;/span&gt;). OA results in decreasing the pH of seawater, leading to alterations in physiology and energy balance in marine organisms (e.g., calcifying organisms such as corals or bivalves) (Doney et al. &lt;span&gt;2020&lt;/span&gt;). Echinoderms such as sea urchin and sea cucumbers (class: Holothuroidea) are calcifiers and are predicted to be more sensitive than other noncalcifying organisms to the effects of OA. However, studies related to the effects of OA on the class Holothuroidea are very limited despite their high ecological and economic significance (Yuan et al. &lt;span&gt;2018&lt;/span&gt;; González-Durán et al. &lt;span&gt;2024&lt;/span&gt;; Yuan and Xie &lt;span&gt;2024&lt;/span&gt;).&lt;/p&gt;&lt;p&gt;Sea cucumbers are widespread from intertidal habitats to various depths and contribute to the ecological functioning of these habitats (Mishra et al. &lt;span&gt;2024&lt;/span&gt;; Woo et al. &lt;span&gt;2013&lt;/span&gt;). These organisms also act as the source of food to various other marine organisms such as fish and crabs; hence, they transfer animal tissue and nutrients to higher trophic levels (Purcell et al. &lt;span&gt;2016&lt;/span&gt;). Ecologically, sea cucumbers are deposit feeders that feed on sediment organic matter, therefore, reducing the organic matters load and redistribution of sediments. Additionally, they also excrete inorganic nitrogen and phosphorus, thereby facilitating primary productivit","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.70128","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Incidental Mortality of Black-Browed Albatross and White-Chinned Petrel in Argentine Longline Fisheries: A Comprehensive Estimation Addressing Spatial and Temporal Stratification and Cryptic Mortality","authors":"Maximiliano Manuel Hernandez,&nbsp;Juan Pablo Seco Pon,&nbsp;Yvan Richard,&nbsp;Marco Favero","doi":"10.1002/aqc.70127","DOIUrl":"https://doi.org/10.1002/aqc.70127","url":null,"abstract":"<div>\u0000 \u0000 <p>The continental shelf and shelf-break of the Southwest Atlantic are among the most productive and biodiverse regions globally. Incidental mortality from fishing activities poses a significant threat to seabird populations in this area. The overlap between fishing operations and seabird distributions leads to bycatch, particularly in longline fisheries where seabirds get hooked during setting or hauling operations. This study is the first in Argentina to assess seabird incidental mortality considering cryptic mortality. We estimated potential annual mortalities between 2005 and 2009 for two keystone species that predominantly interact with fishing vessels. For black-browed albatrosses, the estimated annual mortality was 686 individuals (95% CI: 582–800), whereas for white-chinned petrels was 2278 individuals (95% CI: 1981–2606). We evaluated the differential impact of three longline fleets, distinguished by their operating areas, gear configurations and target species. For both seabird species, the estimated mortality levels in the fleet targeting kingklip were an order of magnitude higher than the fleets targeting skate and Patagonian toothfish. The highest incidental mortality levels were concentrated in the central continental shelf between 44° S and 49° S near the slope. Identifying bycatch patterns may inform and improve the spatial management of fisheries, which is crucial as their cumulative bycatch significantly impacts the sustainability of seabird populations. We emphasise the need to increase the observer coverage in fisheries and improve data quality. Future research should aim to evaluate the effects of incidental mortality on the sustainability of seabird populations across multiple fisheries.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 4","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}