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Mapping the Global Impact of Mining Activities on Freshwater Biodiversity to Inform Conservation Priorities
IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2025-02-25 DOI: 10.1002/aqc.70094
Christophe Brabant, Nakiya Noorbhai, Mette Bendixen, Lars L. Iversen

Natural resource mining is a vital global industry serving sectors such as construction, infrastructure and electronics. The negative impacts of mining, exacerbated by poor governance and lax legislation, have detrimental consequences on the environment, especially in freshwater systems. Mining is shown to disrupt hydrological regimes, sediment dynamics and vegetation structure, which affect water quality, species composition and overall ecosystem health. However, little is known about the global extent of mining impacts on freshwater biodiversity, ultimately hindering mitigation efforts and effective policy implementation. Here, we address this knowledge gap by developing an impact probability model to generate global threat maps based on the impact of mining for freshwater fish, macrophytes and odonatan. We show that the impact of mining differs significantly between taxonomic groups, with hotspots of risk coinciding with high-biodiversity and wilderness areas. Using a random forest machine learning model, we show that the extent of mining impacts is driven primarily by environmental and anthropogenic variables, such as land surface runoff and the Human Development Index. This overview of the global distribution of mining's threat is urgently needed for conservation plans to mitigate the impact of mining on biodiversity.

{"title":"Mapping the Global Impact of Mining Activities on Freshwater Biodiversity to Inform Conservation Priorities","authors":"Christophe Brabant,&nbsp;Nakiya Noorbhai,&nbsp;Mette Bendixen,&nbsp;Lars L. Iversen","doi":"10.1002/aqc.70094","DOIUrl":"https://doi.org/10.1002/aqc.70094","url":null,"abstract":"<p>Natural resource mining is a vital global industry serving sectors such as construction, infrastructure and electronics. The negative impacts of mining, exacerbated by poor governance and lax legislation, have detrimental consequences on the environment, especially in freshwater systems. Mining is shown to disrupt hydrological regimes, sediment dynamics and vegetation structure, which affect water quality, species composition and overall ecosystem health. However, little is known about the global extent of mining impacts on freshwater biodiversity, ultimately hindering mitigation efforts and effective policy implementation. Here, we address this knowledge gap by developing an impact probability model to generate global threat maps based on the impact of mining for freshwater fish, macrophytes and odonatan. We show that the impact of mining differs significantly between taxonomic groups, with hotspots of risk coinciding with high-biodiversity and wilderness areas. Using a random forest machine learning model, we show that the extent of mining impacts is driven primarily by environmental and anthropogenic variables, such as land surface runoff and the Human Development Index. This overview of the global distribution of mining's threat is urgently needed for conservation plans to mitigate the impact of mining on biodiversity.</p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 3","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.70094","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481348","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}
引用次数: 0
The Apparent Change in Population Structure of Green Turtles (Chelonia mydas) at a Northern Great Barrier Reef Foraging Site Over Three Decades and an Evaluation of Potential Causes
IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2025-02-25 DOI: 10.1002/aqc.70078
Ian P. Bell, Alastair B. Freeman, Len J. McKenzie, Rudi L. Yoshida, Jeffrey D. Miller, Ellen Ariel, Colin J. Limpus

Green Island lies approximately 11 km off the north Queensland coast of Australia. The associated 710-ha reef flat supports a Chelonia mydas foraging population, which has been monitored by the Queensland Government's Threatened Species Program since 1988. Population census data for this area show a significant adult age-class-specific population decline for C. mydas. Preliminary evaluation indicates the decline in adult age-classed turtles is unlikely to be caused by incidental capture, habitat degradation, pollution, change of foraging sites or climate change. Traditional take (locally or during reproductive migrations) provides a plausible explanation. A continuation of this trend may threaten the existence of C. mydas in this part of the Great Barrier Reef World Heritage Area.

{"title":"The Apparent Change in Population Structure of Green Turtles (Chelonia mydas) at a Northern Great Barrier Reef Foraging Site Over Three Decades and an Evaluation of Potential Causes","authors":"Ian P. Bell,&nbsp;Alastair B. Freeman,&nbsp;Len J. McKenzie,&nbsp;Rudi L. Yoshida,&nbsp;Jeffrey D. Miller,&nbsp;Ellen Ariel,&nbsp;Colin J. Limpus","doi":"10.1002/aqc.70078","DOIUrl":"https://doi.org/10.1002/aqc.70078","url":null,"abstract":"<div>\u0000 \u0000 <p>Green Island lies approximately 11 km off the north Queensland coast of Australia. The associated 710-ha reef flat supports a <i>Chelonia mydas</i> foraging population, which has been monitored by the Queensland Government's Threatened Species Program since 1988. Population census data for this area show a significant adult age-class-specific population decline for <i>C. mydas</i>. Preliminary evaluation indicates the decline in adult age-classed turtles is unlikely to be caused by incidental capture, habitat degradation, pollution, change of foraging sites or climate change. Traditional take (locally or during reproductive migrations) provides a plausible explanation. A continuation of this trend may threaten the existence of <i>C. mydas</i> in this part of the Great Barrier Reef World Heritage Area.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 3","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481595","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}
引用次数: 0
Wild or Farmed: Carbon and Nitrogen Stable Isotope Values as Natural Biomarkers to Improve the Traceability of Endangered Totoaba (Totoaba macdonaldi, Sciaenidae)
IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2025-02-20 DOI: 10.1002/aqc.70091
Julián Gamboa-Delgado, Ricardo Sánchez-Díaz

Totoaba macdonaldi is a large Sciaenid fish listed as a vulnerable species. The illegal commerce of its swimming bladder has caused severe overfishing, which has in turn been associated to the population decline of vaquita, a porpoise endemic to the Gulf of California. The present study had two objectives; the first was to use the natural carbon and nitrogen stable isotope values of wild and farmed totoaba as biomarkers to identify their origin. In the second part of the study, a group of juvenile totoabas was maintained under controlled feeding conditions to explore their rates of isotopic change and estimate the time required for the dietary isotopic values to be transferred into muscle tissue. Results from the feeding experiment indicated that muscle tissue of fish reached an isotopic equilibrium with the offered diet after 28 days for carbon and 43 days for nitrogen. Muscle samples collected from wild and farmed totoaba were analysed and data revealed that the isotopic values (carbon and nitrogen) were significantly different between both groups of organisms. A discriminant analysis using dual isotopic measurements showed a significant separation of classes, indicating that the isotopic values measured at natural abundance levels, can be effectively applied as biomarkers to support the traceability processes of farmed totoaba. The implications to promote a reduction of product mislabelling and to improve detection of illegally extracted fish are addressed.

{"title":"Wild or Farmed: Carbon and Nitrogen Stable Isotope Values as Natural Biomarkers to Improve the Traceability of Endangered Totoaba (Totoaba macdonaldi, Sciaenidae)","authors":"Julián Gamboa-Delgado,&nbsp;Ricardo Sánchez-Díaz","doi":"10.1002/aqc.70091","DOIUrl":"https://doi.org/10.1002/aqc.70091","url":null,"abstract":"<div>\u0000 \u0000 <p><i>Totoaba macdonaldi</i> is a large Sciaenid fish listed as a vulnerable species. The illegal commerce of its swimming bladder has caused severe overfishing, which has in turn been associated to the population decline of vaquita, a porpoise endemic to the Gulf of California. The present study had two objectives; the first was to use the natural carbon and nitrogen stable isotope values of wild and farmed totoaba as biomarkers to identify their origin. In the second part of the study, a group of juvenile totoabas was maintained under controlled feeding conditions to explore their rates of isotopic change and estimate the time required for the dietary isotopic values to be transferred into muscle tissue. Results from the feeding experiment indicated that muscle tissue of fish reached an isotopic equilibrium with the offered diet after 28 days for carbon and 43 days for nitrogen. Muscle samples collected from wild and farmed totoaba were analysed and data revealed that the isotopic values (carbon and nitrogen) were significantly different between both groups of organisms. A discriminant analysis using dual isotopic measurements showed a significant separation of classes, indicating that the isotopic values measured at natural abundance levels, can be effectively applied as biomarkers to support the traceability processes of farmed totoaba. The implications to promote a reduction of product mislabelling and to improve detection of illegally extracted fish are addressed.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 2","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143447019","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}
引用次数: 0
Satellite Tracking and Photographic-Identification as Connectivity-Based Tools Towards Conservation Planning of Pilot Whales
IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2025-02-20 DOI: 10.1002/aqc.70053
Mieke Weyn, Jacobo Marrero-Pérez, Anna Sánchez Mora, Atenary Pimentel González, Rita Ferreira, Annalisa Sambolino, Ana Dinis, Catarina Sofia Mateus, Marc Fernandez, Filipe Alves

Identifying biogeographical patterns and important biological (blue) corridors can greatly contribute to conservation planning. Yet, this is particularly challenging when addressing pelagic species. In this study, satellite telemetry and photographic-identification data of short-finned pilot whales (Globicephala macrorhynchus) were used to identify preferred areas and pathways in the Macaronesia biogeographical region, namely between Madeira and two regions in the Canary Islands, the Western (WCI, La Palma and El Hierro) and the Central (CCI, Tenerife and La Gomera). Home-range and time-varying move persistence analyses from tracking data of four whales that moved between both archipelagos over 578 days revealed preferred areas in Madeira and the WCI, new connectivity pathways and the importance of both regions for area-restricted behaviours. These findings were corroborated by a high number (n = 71) of photographic matches between Madeira (catalogue of 1276 individuals) and the WCI (456 individuals), compared to only four between Madeira and the CCI (717 individuals). The high linkage of the WCI with Madeira and the CCI (n = 48) suggests that the WCI constitute a key habitat for potential mixing of pilot whales from different groups. This study emphasizes that a combined methodological approach provides robust baseline information for pilot whales' conservation management, which could be valuable for other scenarios and species. Furthermore, shown connectivity patterns contribute to broadening our knowledge on potential blue corridors in the eastern North Atlantic and highlight the importance of considering wide and international geographic areas for conservation planning of highly mobile marine species.

{"title":"Satellite Tracking and Photographic-Identification as Connectivity-Based Tools Towards Conservation Planning of Pilot Whales","authors":"Mieke Weyn,&nbsp;Jacobo Marrero-Pérez,&nbsp;Anna Sánchez Mora,&nbsp;Atenary Pimentel González,&nbsp;Rita Ferreira,&nbsp;Annalisa Sambolino,&nbsp;Ana Dinis,&nbsp;Catarina Sofia Mateus,&nbsp;Marc Fernandez,&nbsp;Filipe Alves","doi":"10.1002/aqc.70053","DOIUrl":"https://doi.org/10.1002/aqc.70053","url":null,"abstract":"<div>\u0000 \u0000 <p>Identifying biogeographical patterns and important biological (blue) corridors can greatly contribute to conservation planning. Yet, this is particularly challenging when addressing pelagic species. In this study, satellite telemetry and photographic-identification data of short-finned pilot whales (<i>Globicephala macrorhynchus</i>) were used to identify preferred areas and pathways in the Macaronesia biogeographical region, namely between Madeira and two regions in the Canary Islands, the Western (WCI, La Palma and El Hierro) and the Central (CCI, Tenerife and La Gomera). Home-range and time-varying move persistence analyses from tracking data of four whales that moved between both archipelagos over 578 days revealed preferred areas in Madeira and the WCI, new connectivity pathways and the importance of both regions for area-restricted behaviours. These findings were corroborated by a high number (<i>n</i> = 71) of photographic matches between Madeira (catalogue of 1276 individuals) and the WCI (456 individuals), compared to only four between Madeira and the CCI (717 individuals). The high linkage of the WCI with Madeira and the CCI (<i>n</i> = 48) suggests that the WCI constitute a key habitat for potential mixing of pilot whales from different groups. This study emphasizes that a combined methodological approach provides robust baseline information for pilot whales' conservation management, which could be valuable for other scenarios and species. Furthermore, shown connectivity patterns contribute to broadening our knowledge on potential blue corridors in the eastern North Atlantic and highlight the importance of considering wide and international geographic areas for conservation planning of highly mobile marine species.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 2","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455968","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}
引用次数: 0
Correction to “Tackling fish passage problems: Conservation implications of fish ascending hypobaric pressure gradients in a pipe”
IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2025-02-20 DOI: 10.1002/aqc.70093

Jeremy, Y., Martino, J., Felder, S., Kingsford, R. and Suthers, I. (2025), Tackling Fish Passage Problems: Conservation Implications of Fish Ascending Hypobaric Pressure Gradients in a Pipe. Aquatic Conserv: Mar Freshw Ecosyst, 35: e70050. https://doi.org/10.1002/aqc.70050.

The source of funding “UNSW University International Postgraduate Award” was incorrectly listed as the first author of the publication in a previous version of the article, which carried over to the citation format for the article. Yoel Jeremy is the first author of this article, and the award should have been listed solely as a source of funding.

We apologize for this error.

{"title":"Correction to “Tackling fish passage problems: Conservation implications of fish ascending hypobaric pressure gradients in a pipe”","authors":"","doi":"10.1002/aqc.70093","DOIUrl":"https://doi.org/10.1002/aqc.70093","url":null,"abstract":"<p>\u0000 <span>Jeremy, Y.</span>, <span>Martino, J.</span>, <span>Felder, S.</span>, <span>Kingsford, R.</span> and <span>Suthers, I.</span> (<span>2025</span>), <span>Tackling Fish Passage Problems: Conservation Implications of Fish Ascending Hypobaric Pressure Gradients in a Pipe</span>. <i>Aquatic Conserv: Mar Freshw Ecosyst</i>, <span>35</span>: e70050. https://doi.org/10.1002/aqc.70050.\u0000 </p><p>The source of funding “UNSW University International Postgraduate Award” was incorrectly listed as the first author of the publication in a previous version of the article, which carried over to the citation format for the article. Yoel Jeremy is the first author of this article, and the award should have been listed solely as a source of funding.</p><p>We apologize for this error.</p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 2","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.70093","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143447078","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}
引用次数: 0
Comparing eDNA and eRNA Sampling Methodologies From Pond Environments
IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2025-02-18 DOI: 10.1002/aqc.70083
Katarzyna Janik-Superson, Dawid Krawczyk, Monika Baranowska, Klaudyna Królikowska, Michał Seweryn, Jakub Lach, Grzegorz Tończyk, Dominik Strapagiel, Karolina Bącela-Spychalska, Annette Taugbøl

Molecular traces are increasingly being applied to assess the presence of species and communities. Studies on environmental DNA (eDNA) have, to a large extent, become common practice in species detection, but less studies have compared biodiversity estimations with the more temporary environmental RNA (eRNA). This study compares metabarcoding results from pond water obtained from both molecule types by sequencing the V4 region in the 18S rRNA marker. Water was collected from two depths, 20 and 80 cm, and filtered sequentially through two filter porosities, 0.45 and 0.22 μm. Each filter was cut in half before fixation in either 96% ETOH or RNAlater. The results showed no differences between the fixatives for either molecule. Overall, biodiversity estimates from eDNA significantly overperformed eRNA, likely due to higher concentrations of eDNA from terrestrial sources. Comparisons of the two depths showed variation for eDNA only, with increasing levels of biodiversity found at the upper water layer. Both filter pore sizes captured distinctive compositions of taxa, where about 30% of the diversity was uniquely identified from the second, finer filter. Taken together, these findings imply that the choice of molecular marker, depth and filter pore size affects the obtained biodiversity estimations in a pond.

{"title":"Comparing eDNA and eRNA Sampling Methodologies From Pond Environments","authors":"Katarzyna Janik-Superson,&nbsp;Dawid Krawczyk,&nbsp;Monika Baranowska,&nbsp;Klaudyna Królikowska,&nbsp;Michał Seweryn,&nbsp;Jakub Lach,&nbsp;Grzegorz Tończyk,&nbsp;Dominik Strapagiel,&nbsp;Karolina Bącela-Spychalska,&nbsp;Annette Taugbøl","doi":"10.1002/aqc.70083","DOIUrl":"https://doi.org/10.1002/aqc.70083","url":null,"abstract":"<p>Molecular traces are increasingly being applied to assess the presence of species and communities. Studies on environmental DNA (eDNA) have, to a large extent, become common practice in species detection, but less studies have compared biodiversity estimations with the more temporary environmental RNA (eRNA). This study compares metabarcoding results from pond water obtained from both molecule types by sequencing the V4 region in the 18S rRNA marker. Water was collected from two depths, 20 and 80 cm, and filtered sequentially through two filter porosities, 0.45 and 0.22 μm. Each filter was cut in half before fixation in either 96% ETOH or RNAlater. The results showed no differences between the fixatives for either molecule. Overall, biodiversity estimates from eDNA significantly overperformed eRNA, likely due to higher concentrations of eDNA from terrestrial sources. Comparisons of the two depths showed variation for eDNA only, with increasing levels of biodiversity found at the upper water layer. Both filter pore sizes captured distinctive compositions of taxa, where about 30% of the diversity was uniquely identified from the second, finer filter. Taken together, these findings imply that the choice of molecular marker, depth and filter pore size affects the obtained biodiversity estimations in a pond.</p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 2","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.70083","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431586","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}
引用次数: 0
Spatial Variability in Juvenile Sea Trout Data Collection and Assessment Methods Across Europe: Limitations and Opportunities for Standardising Analyses
IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2025-02-17 DOI: 10.1002/aqc.70040
Carlos M. Alexandre, Madeleine Berry, Katarina Magnusson, Sara Silva, Pauliina Louhi, Alan Walker, Johan Höjesjö, Iain A. Malcolm

Brown trout (Salmo trutta L.) is a widely distributed fish species native to Europe, with high phenotypic plasticity, including resident and anadromous (sea trout) forms. Many populations are in decline, especially the anadromous ecotype towards the southern edge of their range. Evidence-based management is dependent on reliable assessment methods to characterise underperforming populations and identify mitigation actions. Assessment methods based on juvenile data are useful for trout given the species' plasticity. These typically involve comparisons between observed and expected juvenile densities, which vary geographically and with habitat quality. These estimates are mostly obtained through wading electrofishing and field-based habitat surveys. Although some national and regional trout assessment methods have been developed, efforts to develop range-wide evaluations have been constrained by a lack of common protocols. This paper summarises the national methods used to characterise juvenile trout and associated habitat based on information compiled by national representatives of the ICES WGTRUTTA. It then considers opportunities for harmonising data with the aim of developing a range-wide assessment. Survey methods varied substantially within and between countries but showed no clear spatial patterns of coherence. Development of a single set of survey and data collection methods appears highly unlikely. A more pragmatic approach could involve harmonising existing data to make them broadly comparable. This could involve selective use of fish survey data, integration of range-wide macro-scale spatial and habitat data obtained from spatial datasets and use of appropriate modelling frameworks. We also emphasise the critical importance of population data from index rivers to validate and scale juvenile assessments and to compare sampling methods.

{"title":"Spatial Variability in Juvenile Sea Trout Data Collection and Assessment Methods Across Europe: Limitations and Opportunities for Standardising Analyses","authors":"Carlos M. Alexandre,&nbsp;Madeleine Berry,&nbsp;Katarina Magnusson,&nbsp;Sara Silva,&nbsp;Pauliina Louhi,&nbsp;Alan Walker,&nbsp;Johan Höjesjö,&nbsp;Iain A. Malcolm","doi":"10.1002/aqc.70040","DOIUrl":"https://doi.org/10.1002/aqc.70040","url":null,"abstract":"<div>\u0000 \u0000 <p>Brown trout (<i>Salmo trutta</i> L.) is a widely distributed fish species native to Europe, with high phenotypic plasticity, including resident and anadromous (sea trout) forms. Many populations are in decline, especially the anadromous ecotype towards the southern edge of their range. Evidence-based management is dependent on reliable assessment methods to characterise underperforming populations and identify mitigation actions. Assessment methods based on juvenile data are useful for trout given the species' plasticity. These typically involve comparisons between observed and expected juvenile densities, which vary geographically and with habitat quality. These estimates are mostly obtained through wading electrofishing and field-based habitat surveys. Although some national and regional trout assessment methods have been developed, efforts to develop range-wide evaluations have been constrained by a lack of common protocols. This paper summarises the national methods used to characterise juvenile trout and associated habitat based on information compiled by national representatives of the ICES WGTRUTTA. It then considers opportunities for harmonising data with the aim of developing a range-wide assessment. Survey methods varied substantially within and between countries but showed no clear spatial patterns of coherence. Development of a single set of survey and data collection methods appears highly unlikely. A more pragmatic approach could involve harmonising existing data to make them broadly comparable. This could involve selective use of fish survey data, integration of range-wide macro-scale spatial and habitat data obtained from spatial datasets and use of appropriate modelling frameworks. We also emphasise the critical importance of population data from index rivers to validate and scale juvenile assessments and to compare sampling methods.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 2","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431617","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}
引用次数: 0
Phylogeography of the Pacific Angel Shark (Squatina californica) in the Eastern Pacific
IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2025-02-17 DOI: 10.1002/aqc.70087
Massiel Alfonso-González, Felipe Galván-Magaña, Giovanna Sotil, Omar Domínguez Domínguez, Eduardo Espinoza Herrera, Píndaro Díaz-Jaimes

Squatina californica is a near-threatened angel shark distributed in coastal areas of eastern Pacific. Despite its wide distribution and the conservation threats, basic knowledge of the species populations, evolutionary history and genetic diversity is scarce. In this study, we use two mitochondrial genetic markers (Control Region of mtDNA and Cytochrome C Oxidase subunit I) to explore the species' phylogeography. We included samples from locations in the Southern Californian Pacific (SCP), the Gulf of California (GC) and the Southeast Pacific (SEP). We identified three populations of the Pacific Angel Shark, corresponding to the regions SCP, GC and SEP. These results show an antitropical distribution for the species, which may be a consequence of the climatic instability of Central America during the Pliocene. Additionally, we infer that the divergence of the SCP populations from those of the GC coincided closely with the formation of the Baja California Peninsula, without current migration through the southern end of the peninsula. Finally, we detected a signal of population expansion and substructure within the GC, probably promoted by environmental heterogeneity in this area. Our results indicate that the three populations identified herein should be considered separate management units, because they exhibited independent evolutionary histories that may influence their levels of resilience to fishing pressure.

{"title":"Phylogeography of the Pacific Angel Shark (Squatina californica) in the Eastern Pacific","authors":"Massiel Alfonso-González,&nbsp;Felipe Galván-Magaña,&nbsp;Giovanna Sotil,&nbsp;Omar Domínguez Domínguez,&nbsp;Eduardo Espinoza Herrera,&nbsp;Píndaro Díaz-Jaimes","doi":"10.1002/aqc.70087","DOIUrl":"https://doi.org/10.1002/aqc.70087","url":null,"abstract":"<div>\u0000 \u0000 <p><i>Squatina californica</i> is a near-threatened angel shark distributed in coastal areas of eastern Pacific. Despite its wide distribution and the conservation threats, basic knowledge of the species populations, evolutionary history and genetic diversity is scarce. In this study, we use two mitochondrial genetic markers (Control Region of mtDNA and Cytochrome C Oxidase subunit I) to explore the species' phylogeography. We included samples from locations in the Southern Californian Pacific (SCP), the Gulf of California (GC) and the Southeast Pacific (SEP). We identified three populations of the Pacific Angel Shark, corresponding to the regions SCP, GC and SEP. These results show an antitropical distribution for the species, which may be a consequence of the climatic instability of Central America during the Pliocene. Additionally, we infer that the divergence of the SCP populations from those of the GC coincided closely with the formation of the Baja California Peninsula, without current migration through the southern end of the peninsula. Finally, we detected a signal of population expansion and substructure within the GC, probably promoted by environmental heterogeneity in this area. Our results indicate that the three populations identified herein should be considered separate management units, because they exhibited independent evolutionary histories that may influence their levels of resilience to fishing pressure.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 2","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143431549","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}
引用次数: 0
Internesting Period and Clutch Frequency of the Endangered Loggerhead Turtle Population of Cabo Verde
IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2025-02-17 DOI: 10.1002/aqc.70075
Ana Raposo, Rui Rebelo, Adolfo Marco

Knowledge about the reproductive success of sea turtles is essential for their conservation. These nest preferentially on the beaches where they were born and may nest more than once during each nesting season, with a variable number of nests per female. Several factors can lead to variations in reproductive output. This study estimated the clutch frequency and internesting period of the threatened subpopulation of the loggerhead turtle (Caretta caretta) from the island of Boa Vista, Cabo Verde. This archipelago hosts the second-largest (or perhaps largest) population of C. caretta globally, with Boa Vista being the most important nesting island. Female distinctions were made on their previous experience (neophytes and remigrants) and their body size. Data were collected between 2013 and 2020 through marking and recapture, on João Barrosa beach, in the Reserva Natural das Tartarugas. In years with more females nesting on beaches, a smaller percentage of nests are studied because of the difficulty in reporting them all. As such, only the first 25% of the nests were analysed. Minimum clutch frequency ranged between 3.8 and 4.1. Remigrants had a larger body size and higher clutch frequency than neophytes, without differences in the internesting period. This study also showed differences between neophyte and remigrant females, specifically only in their measured clutch frequency. However, neophytes likely switch between nesting grounds more often, evading monitoring, and highlighting their potential to move to other islands or to breed out of the main season. These findings enhance our understanding of reproductive strategies, enabling the application of distinct conservation strategies tailored to each group. Satellite telemetry could address study limitations regarding clutch frequency values and provide a better understanding of nesting patterns and the impact of environmental factors on reproduction. This could improve conservation strategies by identifying critical habitats and guiding targeted protective measures, supporting population recovery.

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引用次数: 0
Social Clustering and Conservation Implications for Critically Endangered Taiwanese Humpback Dolphins (Sousa chinensis taiwanensis)
IF 2.5 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Pub Date : 2025-02-15 DOI: 10.1002/aqc.70089
Mei-Ling Bai, Chieh Ning Huang, Yu-Yi Lien

In social species, social relationships of an individual play a crucial role in its fitness, and the social structure of a population can be vital to its viability. This study investigated the social network of the critically endangered Taiwanese humpback dolphin (Sousa chinensis taiwanensis) population during the periods 2017–2020 and 2021–2023. We observed a reduction in the strength and reach of the social network compared with a decade ago. The population could be divided into three clusters, each characterized by distinct age compositions and network metrics, with limited intercluster associations and minimal overlap in core areas. The decline and ageing of the northern cluster suggested the need for further research into its habitat quality. In the central cluster, which previously had high calf sighting rates, low intracluster association and a limited number of young individuals raised concerns about reproductive constraints. The southern cluster, although most socially vigorous, partly occupied areas outside the protected zone. Our findings emphasized the need for cluster-specific management strategies to enhance conservation efforts.

{"title":"Social Clustering and Conservation Implications for Critically Endangered Taiwanese Humpback Dolphins (Sousa chinensis taiwanensis)","authors":"Mei-Ling Bai,&nbsp;Chieh Ning Huang,&nbsp;Yu-Yi Lien","doi":"10.1002/aqc.70089","DOIUrl":"https://doi.org/10.1002/aqc.70089","url":null,"abstract":"<div>\u0000 \u0000 <p>In social species, social relationships of an individual play a crucial role in its fitness, and the social structure of a population can be vital to its viability. This study investigated the social network of the critically endangered Taiwanese humpback dolphin (<i>Sousa chinensis taiwanensis</i>) population during the periods 2017–2020 and 2021–2023. We observed a reduction in the strength and reach of the social network compared with a decade ago. The population could be divided into three clusters, each characterized by distinct age compositions and network metrics, with limited intercluster associations and minimal overlap in core areas. The decline and ageing of the northern cluster suggested the need for further research into its habitat quality. In the central cluster, which previously had high calf sighting rates, low intracluster association and a limited number of young individuals raised concerns about reproductive constraints. The southern cluster, although most socially vigorous, partly occupied areas outside the protected zone. Our findings emphasized the need for cluster-specific management strategies to enhance conservation efforts.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"35 2","pages":""},"PeriodicalIF":2.5,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423516","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}
引用次数: 0
期刊
Aquatic Conservation-Marine and Freshwater Ecosystems
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