Aquatic Conservation-Marine and Freshwater Ecosystems最新文献

{"title":"Identifying a Self-Sustaining Population, Spawning Site and Population Size of the Danube Salmon Hucho hucho Using the Citizen Science Approach","authors":"Goran Jakšić,&nbsp;Marina Piria,&nbsp;Neven Bočić","doi":"10.1002/aqc.4253","DOIUrl":"https://doi.org/10.1002/aqc.4253","url":null,"abstract":"<div>\u0000 \u0000 <p>The last populations of Danube salmon (<i>Hucho hucho</i>) in Croatia are found in the Kupa and Una rivers. However, the size of the suitable area that could serve as the best spawning ground for the remnant Danube salmon population in these rivers is not known. This study aimed to leverage anglers' experiences to determine the sections of the Una and Kupa rivers where the last populations of Danube salmon (<i>Hucho hucho</i>) in Croatia are most abundant, identify potential spawning sites and assess threats that could impact the species' existence. The Kupica river emerged as a tributary of the Kupa river with a large Danube salmon population in Croatia. Experienced divers conducted three dives along a 350-m transect in the Kupica river, estimating a total of 13 Danube salmon individuals ranging from 50 to 115 cm in total length, in pool and run mesohabitat types. In the Kupa and Kupica rivers, the survey identified 25 Danube salmon spawning sites. The primary local threats identified for the Danube salmon population include small hydropower plants, the construction of a radioactive waste disposal site, water abstraction, the removal of riparian vegetation, overfishing and climate change. Based on the results of this study, we strongly recommend the implementation of protective measures against these threats and the establishment of an ichthyological reserve specifically for Danube salmon in the Kupica river. This recommendation aligns with the EU Biodiversity Strategy, emphasizing the need to identify designated areas by 2030.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"34 9","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142244920","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":"Integrated Fatty Acid and Stable Isotope Niches Reveal Trophic Connections Among Sympatric Large-Bodied Sharks","authors":"Chloe N. Roberts,&nbsp;Lauren Meyer,&nbsp;Nigel E. Hussey,&nbsp;Bruce Davidson,&nbsp;Geremy Cliff,&nbsp;Charlie Huveneers","doi":"10.1002/aqc.4251","DOIUrl":"https://doi.org/10.1002/aqc.4251","url":null,"abstract":"<p>This study used a novel approach combining stable isotope data and condensed multivariate fatty acid data to define comparative niche space and overlap of six sympatric sharks from the south-west Indian Ocean: <i>Galeocerdo cuvier</i>, <i>Sphyrna zygaena</i>, <i>Sphyrna lewini</i>, <i>Carcharias taurus</i>, <i>Carcharodon carcharias</i> and <i>Carcharhinus obscurus</i>. <i>G. cuvier</i> had the smallest fatty acid niche space but exhibited the largest range in δ¹³C, suggestive of foraging across multiple environments (habitat generalist) but on nutritionally similar prey in a narrow trophic band (nutritional specialist). The remaining five species had comparatively higher δ¹⁵N, pelagic-based fatty acids and larger fatty acid niche spaces, suggesting they are nutritional generalists with a preference for higher trophic level prey. Niche space was not associated with conservation status despite declining populations for half of the species studied. This suggests that resource availability is not a limiting factor for these species and that their mobile nature provides them access to diverse habitats and resources, while exposing them to a broad range of anthropogenic threats, muting the relationship between conservation status and resource use. The combined approach allowed for a comprehensive representation of niche space, distinguishing species based on trophic level, basal carbon sources and pelagic and coastal prey consumption. The presented integrated approach provides greater detail and resolution of elasmobranch trophic ecology that could not be achieved with either fatty acid or stable isotope analysis alone.</p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"34 9","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.4251","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142234830","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":"Exploring the Potential of Seed-Based Dwarf Eelgrass (Zostera noltii) Restoration","authors":"Max L. E. Gräfnings,&nbsp;Nadia Hijner,&nbsp;Jannes H. T. Heusinkveld,&nbsp;Maarten Zwarts,&nbsp;Gabriela Maldonado,&nbsp;Henk Wiersema,&nbsp;Raven Cammenga,&nbsp;Quirin Smeele,&nbsp;Tjisse van der Heide,&nbsp;Laura L. Govers","doi":"10.1002/aqc.4235","DOIUrl":"https://doi.org/10.1002/aqc.4235","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"34 9","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.4235","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142230946","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":"An Invasive Predator Substantially Alters Energy Flux Without Changing Food Web Functional State or Stability","authors":"Hayley C. Glassic,&nbsp;James R. Junker,&nbsp;Christopher S. Guy,&nbsp;Lusha M. Tronstad,&nbsp;Michelle A. Briggs,&nbsp;Lindsey K. Albertson,&nbsp;Dominique R. Lujan,&nbsp;Travis O. Brenden,&nbsp;Timothy E. Walsworth,&nbsp;Todd M. Koel","doi":"10.1002/aqc.4240","DOIUrl":"https://doi.org/10.1002/aqc.4240","url":null,"abstract":"<p>Understanding how invasive species affect the stability and function of ecosystems is critical for conservation. Here, we quantified the effect of an actively suppressed invasive species on the Yellowstone Lake ecosystem using a food web energetics approach. We compared energy flux, functional state, and stability of four food web states: a pre-invasion network and three post-invasion networks undergoing active invasive species suppression, namely, initial invasion, expansion, and decline. Invasion caused ≥ 25% change (±) in energy flux for most consumers, and total flux increased twofold post-invasion. Flux to the species of conservation concern, Yellowstone cutthroat trout (<i>Oncorhynchus virginalis bouvieri</i>), was 2.8 times less post-invasion versus pre-invasion, whereas invasive lake trout (<i>Salvelinus namaycush</i>) flux was up to 17.3 times higher compared to the initial invasion network. The dominant functional state and food web stability did not change post-invasion, likely due to introduction of a generalist predator and the stabilizing effect of suppression. Lake trout invasion in Yellowstone Lake caused large changes to energy flux, shifting dominant fluxes away from the species of conservation concern, despite not changing functional state or stability. We demonstrate that changes in energy flux may signal invasions in ecosystems, but functional state or stability may not necessarily reflect the magnitude of invasion influences. For invaded fish communities, a better understanding of how the invasive species control the food web beyond just the direct influence on prey can be achieved by investigating energy flux, functional state, and food web stability. Furthermore, evaluating the effect of suppression beyond the invasive species can demonstrate the far-reaching value of suppression management actions for conservation.</p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"34 9","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.4240","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142174215","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":"Deep Learning for Multilabel Classification of Coral Reef Conditions in the Indo-Pacific Using Underwater Photo Transect Method","authors":"Xinlei Shao,&nbsp;Hongruixuan Chen,&nbsp;Kirsty Magson,&nbsp;Jiaqi Wang,&nbsp;Jian Song,&nbsp;Jundong Chen,&nbsp;Jun Sasaki","doi":"10.1002/aqc.4241","DOIUrl":"https://doi.org/10.1002/aqc.4241","url":null,"abstract":"<p>Because coral reef ecosystems face threats from human activities and climate change, coral reef conservation programmes are implemented worldwide. Monitoring coral health provides references for guiding conservation activities. However, current labour-intensive methods result in a backlog of unsorted images, highlighting the need for automated classification. Few studies have simultaneously utilized accurate labels along with updated algorithms and datasets. This study aimed to create a dataset representing common coral reef conditions and associated stressors in the Indo-Pacific. Concurrently, it assessed existing classification algorithms and proposed a new multilabel method for automatically detecting coral reef conditions and extracting ecological information. A dataset containing over 20,000 high-resolution coral images of different health conditions and stressors was constructed based on the field survey. Seven representative deep learning architectures were tested on this dataset, and their performance was quantitatively evaluated using the F1 metric and the match ratio. Based on this evaluation, a new method utilizing the ensemble learning approach was proposed. The proposed method accurately classified coral reef conditions as healthy, compromised, dead and rubble; it also identified corresponding stressors, including competition, disease, predation and physical issues. This method can help develop the coral image archive, guide conservation activities and provide references for decision-making for reef managers and conservationists. The proposed ensemble learning approach outperforms others on the dataset, showing state-of-the-art (SOTA) performance. Future research should improve its generalizability and accuracy to support global coral reef conservation efforts.</p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"34 9","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.4241","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142165549","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":"High-Resolution Ensemble Modelling of Coral Distributions in the Northern Gulf of Mexico Based on Geomorphometry: Coral Diversity and Benthic Habitat Fragmentation From Oil and Gas Infrastructure to Inform Spatial Planning","authors":"Vincent Lecours,&nbsp;Amy Oxton,&nbsp;Danny Khor,&nbsp;Julia Tiplea","doi":"10.1002/aqc.4234","DOIUrl":"https://doi.org/10.1002/aqc.4234","url":null,"abstract":"<p>The northern Gulf of Mexico is home to several species of corals that provide a wide range of ecosystem services to other organisms. Oil and gas infrastructure, such as platforms and pipelines, form an extensive network throughout the northern Gulf of Mexico. Detrimental impacts associated with oil and gas exploration and extraction have been recorded in this area at depths where corals are found. Due to these ecosystems' vulnerability to long-term impacts, it is necessary to determine areas of interest that would benefit from further exploration and informed spatial planning. This study aimed to identify potential areas of interest for coral studies in the northern Gulf of Mexico. Ensemble species distribution models for 13 species of corals including scleractinians, black corals, and octocorals were produced based on seafloor characteristics and combined to identify areas with relatively higher coral diversity potential than others. The ensemble modelling approach produced robust outputs, as evaluated by the area under the curve, Cohen's kappa coefficient, sensitivity, specificity and the proportion of correct predictions. The proximity of suitable habitat to active and proposed oil and gas infrastructure was evaluated; this spatial analysis showed that oil and gas infrastructures potentially impact 23.5% of all predicted suitable coral habitat in the study area and contribute to benthic habitat fragmentation. Twelve areas of interest greater than 100 km² and located outside a 4-km zone of potential influence from oil and gas infrastructure were delineated and deemed of interest for further exploration and spatial planning, and hypothetical prioritization scenarios for spatial planning are presented. The maps produced can inform discussions among stakeholders to reach the best spatial planning outcomes while considering other ecological, social, economic and governance factors.</p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"34 9","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.4234","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142165210","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":"Assessment of Octocoral-Dominated Benthic Assemblages Along a Mesophotic Gradient, With a Focus on the Impact of Lost Fishing Gears","authors":"Nils Lucas Jacobsen,&nbsp;Camilla Roveta,&nbsp;Torcuato Pulido Mantas,&nbsp;Martina Coppari,&nbsp;Cristina Gioia Di Camillo,&nbsp;Barbara Calcinai,&nbsp;Carlo Cerrano","doi":"10.1002/aqc.4248","DOIUrl":"https://doi.org/10.1002/aqc.4248","url":null,"abstract":"<p>Coralligenous, a typical Mediterranean mesophotic habitat, is a highly diverse assemblage, severely threatened by several stressors, including fishing litter. To characterise the coralligenous of the upper mesophotic of the Portofino Promontory (Ligurian Sea, Italy), video transects at 35 and 50 m depth were performed at four sites. Benthic assemblages and lost fishing gears were recorded, and the two depths compared. A higher coverage of taxa with complex 3D structures was found at 50 m, mainly due to the gorgonian <i>Paramuricea clavata</i>. However, the overall low density of this species (0.4–6.6 colonies/m²), together with the impact caused by 120 fishing lines found along the transects, highlights the need for tailored conservation measures. With climate change moving further down the water column and fishing impacts being a major cause of degradation, the design of marine protected areas needs to be extended to include mesophotic depths, contributing to the 30 × 30 targets agreed upon at the COP15.</p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"34 9","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.4248","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142165211","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":"Genetic Diversity and Population Dynamics of Lobodon carcinophaga in Danco Coast, Antarctica","authors":"Laura Prosdocimi,&nbsp;Ezequiel Alejandro Ibañez,&nbsp;María Constanza Gariboldi,&nbsp;Javier Negrete,&nbsp;Magalí Bobinac,&nbsp;Humberto Luis Cappozzo,&nbsp;Juan Ignacio Túnez","doi":"10.1002/aqc.4246","DOIUrl":"https://doi.org/10.1002/aqc.4246","url":null,"abstract":"<div>\u0000 \u0000 <p>The crabeater seal (<i>Lobodon carcinophaga</i>) is the most common Antarctic seal; however, it remains understudied regarding genetic aspects. This research examined the genetic diversity and population dynamics of the Danco Coast population in the Antarctic Peninsula and compared it with the Western Antarctica population. Twenty novel haplotypes were identified, revealing a stable population phase and a brief expansion. The high genetic diversity aligns with those found in similar species and environments. Historical population dynamics correlate with Pleistocene climate shifts, shedding light on climate change's impact on Antarctic ecosystems. This study increases our understanding of Antarctic seal species, contributing to the region's guidelines to improve environmental conservation policies in the Antarctic sector.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"34 9","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142100351","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":"Site Selection Criteria and Recommendations for the Restocking of Juveniles of River Prawn Cryphiops caementarius in the Semiarid Region of Chile: A Basin and Participatory Approach","authors":"Carlos Velásquez,&nbsp;Yeriko Alanís,&nbsp;Luis Henríquez-Antipa,&nbsp;P. Francisco Cárcamo","doi":"10.1002/aqc.4249","DOIUrl":"https://doi.org/10.1002/aqc.4249","url":null,"abstract":"<div>\u0000 \u0000 <p>The fishery of the river prawn <i>Cryphiops caementarius</i> in semiarid basins of northern Chile constitutes a small-scale artisanal activity, developed in fragmented habitats with extended periods of drought, which represents a severe threat for the conservation of its populations. Fishers filed an environmental complaint for massive prawn mortalities caused by river channellings in the Choapa River basin. The government promoted a participatory program with fishers to carry out a restocking initiative in this basin, releasing ~4000 hatchery reared juveniles. The aim of this study was to evaluate site selection criteria for the releases, which included ecological variables relevant to the life habits of juveniles. These criteria incorporated background of the natural history of the species, seasonal monitoring of habitat indicators (fluvial habitat index and hydraulic stress index) and recommendations of fishers (traditional ecological knowledge). This study demonstrated that the integration of these criteria and restocking sciences based on aquaculture is beneficial when selecting the release site, with a high coincidence of ecological characteristics for <i>C. caementarius</i> to thrive. The results of this experience are discussed, emphasizing the pioneering character of this type of measure in freshwater crustaceans in Chilean basins, the ecological framework used to responsibly assist these measures in basins with intense anthropogenic impacts and recommendations that allow the improvement of the releases and monitoring efforts of this species, considering the drought scenario that affects this region of Chile.</p>\u0000 </div>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"34 9","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142100259","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":"When Methodological Innovation Changes the Game: A 10-Year Review of Environmental DNA (eDNA) Applied to Crayfish","authors":"Thomas Baudry,&nbsp;Valentin Vasselon,&nbsp;Carine Delaunay,&nbsp;Michael Sweet,&nbsp;Frédéric Grandjean","doi":"10.1002/aqc.4245","DOIUrl":"https://doi.org/10.1002/aqc.4245","url":null,"abstract":"<p>The use of environmental DNA (eDNA) as a tool for monitoring represents a major innovative advance in environmental science, one that enables the detection of species without the need to observe or capture them. This article assesses the state of play of eDNA research targeting crayfish. We found a total of 41 peer-reviewed articles published between 2014 and 2023 on both native and invasive species. Most studies focused on invasive species (or a native/invasive species co-detection assessment) (65.8%). There was also a clear geographical bias across studies, with more than half conducted in Europe (51.2%) and a quarter in the United States (26.8%). In contrast, there were none conducted in Africa. The relatively large number of published studies has led to an interesting diversity of protocols designed or utilized, with most favouring the development of their own assays (69.33%). That said, filtration (as an eDNA capture method) was common (80.5%), along with the use of commercially available eDNA extraction kits (69.8%). The COI gene also appeared to be the preferred target region (89.33%). Such range of protocols is interesting, but is it optimal? Are the best protocols always being utilized? Or is the chance for novel application hampering our ability to explore larger trends across studies?</p>","PeriodicalId":55493,"journal":{"name":"Aquatic Conservation-Marine and Freshwater Ecosystems","volume":"34 9","pages":""},"PeriodicalIF":2.5,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/aqc.4245","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142100350","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}