Marine and Freshwater Research最新文献_第7页

Long-distance dispersal of the endangered Pacific nurse shark (Ginglymostoma unami, Orectolobiformes) in Costa Rica revealed through acoustic telemetry 通过声学遥测揭示哥斯达黎加濒危太平洋护士鲨（Ginglymostoma unami, Orectolobiformes）的远距离散布情况

IF 1.8 4区环境科学与生态学

Marine and Freshwater Research Pub Date : 2024-01-24 DOI: 10.1071/mf23162

Sergio Madrigal-Mora, Elpis J. Chávez, Randall Arauz, Christopher G. Lowe, Mario Espinoza

{"title":"Long-distance dispersal of the endangered Pacific nurse shark (Ginglymostoma unami, Orectolobiformes) in Costa Rica revealed through acoustic telemetry","authors":"Sergio Madrigal-Mora, Elpis J. Chávez, Randall Arauz, Christopher G. Lowe, Mario Espinoza","doi":"10.1071/mf23162","DOIUrl":"https://doi.org/10.1071/mf23162","url":null,"abstract":"Long-distance movements associated with environmental and ecological drivers are common in a wide array of mobile marine species. Understanding such movements and associated drivers is particularly important for management and conservation of threatened species, which may be exposed to anthropogenic threats throughout their range. Pacific nurse sharks (Ginglymostoma unami) are endangered because of their interactions with fisheries and a lack of biological knowledge as a recently described species. Little is known about this species’ movements throughout its broad distribution in the tropical Pacific coast of Latin America. Using passive acoustic telemetry, we report the longest ranging movement so far observed for Pacific nurse sharks. A male individual, measuring 176-cm total length at the time of tagging, travelled over 390 km within 46 days along the North Pacific coastline of Costa Rica. These findings highlight the importance of collaboration and data exchange among researchers to enable monitoring of broader geographical ranges and provide critical insight into the movement capabilities of this endangered species. Defining marine corridors and identifying essential habitats for Pacific nurse sharks may be necessary to mitigate fishing-related impacts if these longer distance movements are common across their population.","PeriodicalId":18209,"journal":{"name":"Marine and Freshwater Research","volume":"59 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139583830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Managing flows for frogs: wetland inundation extent and duration promote wetland-dependent amphibian breeding success 为青蛙管理水流：湿地淹没范围和持续时间可促进依赖湿地的两栖动物成功繁殖

IF 1.8 4区环境科学与生态学

Marine and Freshwater Research Pub Date : 2024-01-24 DOI: 10.1071/mf23181

J. F. Ocock, A. Walcott, J. Spencer, S. Karunaratne, R. F. Thomas, J. T. Heath, D. Preston

{"title":"Managing flows for frogs: wetland inundation extent and duration promote wetland-dependent amphibian breeding success","authors":"J. F. Ocock, A. Walcott, J. Spencer, S. Karunaratne, R. F. Thomas, J. T. Heath, D. Preston","doi":"10.1071/mf23181","DOIUrl":"https://doi.org/10.1071/mf23181","url":null,"abstract":" ContextRiver regulation is a key threat to amphibian communities that continue to face global declines. Prior work in regulated river catchments has indicated that wetland inundation from connecting river flows supports breeding in some frog species more than others. AimsOur aim was to identify flow metrics influencing breeding and recruitment success in flow-dependent frogs, to derive flow–ecology relationships. MethodsWe conducted repeat surveys of frog communities between 2015 and 2020 across two important wetlands in the northern Murray–Darling Basin, Australia. Using random forest analyses, we investigated the influence of 22 explanatory variables on breeding activity and success. Key resultsInundation extent was the most important driver of calling activity by flow-dependent species (increasing breeding attempts), whereas the volume of river flows in the preceding months was most important for increasing breeding success. ConclusionsTwo key features of the flow pulse are linked to breeding success for amphibians in floodplain wetland systems: (1) the size of the pulse as it relates to area of wetland inundated; and (2) the duration of connecting flows as a measure of wetland duration. ImplicationsBy establishing amphibian flow–ecology relationships, these species can be included in governmental environmental water objectives and management.","PeriodicalId":18209,"journal":{"name":"Marine and Freshwater Research","volume":"30 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139584162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Impacts of VIE tagging and Rhodamine B immersion staining on two measures of performance for a small-bodied fish VIE 标记和罗丹明 B 浸染对衡量小体型鱼类性能的两种方法的影响

IF 1.8 4区环境科学与生态学

Marine and Freshwater Research Pub Date : 2024-01-17 DOI: 10.1071/mf23187

P. A. Franklin, R. Crawford, W. B. van Ravenhorst, C. F. Baker

{"title":"Impacts of VIE tagging and Rhodamine B immersion staining on two measures of performance for a small-bodied fish","authors":"P. A. Franklin, R. Crawford, W. B. van Ravenhorst, C. F. Baker","doi":"10.1071/mf23187","DOIUrl":"https://doi.org/10.1071/mf23187","url":null,"abstract":" ContextPassage efficiency is an important metric for quantifying the success of fish-passage remediation. Mark–recapture methods are typically employed to estimate fish-passage efficiency. Although biotelemetry methods have become a benchmark standard for such studies, they remain unfeasible for many small-bodies species because of the excessive size of electronic tags. AimsThis study compares two commonly deployed marking methods that are potentially suitable for estimating passage efficiency for small-bodied species, namely, visible implant elastomer (VIE) tagging and batch immersion staining with Rhodamine B. MethodsThe critical swimming speeds and passage efficiency at a remediated culvert of Galaxias maculatus were compared for VIE-tagged, Rhodamine B-stained and control treatments. Key resultsBoth critical swimming speeds and passage efficiency at the culvert were significantly lower in VIE-tagged Galaxias maculatus than in both control fish and fish stained with Rhodamine B. ConclusionsRhodamine B may be a suitable batch immersion stain for short-term (<4 day), non-destructive mark–recapture studies in small-bodied fishes, but VIE-tagging methods may result in underestimation of passage efficiency. ImplicationsIt is important to evaluate the impact of marking techniques on the outcomes of mark–recapture studies to ensure that estimates of passage efficiency are accurate.","PeriodicalId":18209,"journal":{"name":"Marine and Freshwater Research","volume":"297 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139499914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

The suitability of a dynamic coastal lake to support the diadromous fish Galaxias maculatus 一个充满活力的沿岸湖泊是否适于养殖洄游鱼类 "鲶鱼" (Galaxias maculatus)

IF 1.8 4区环境科学与生态学

Marine and Freshwater Research Pub Date : 2024-01-09 DOI: 10.1071/mf23167

Christopher G. Meijer, Michael J. H. Hickford, Duncan P. Gray, David R. Schiel

{"title":"The suitability of a dynamic coastal lake to support the diadromous fish Galaxias maculatus","authors":"Christopher G. Meijer, Michael J. H. Hickford, Duncan P. Gray, David R. Schiel","doi":"10.1071/mf23167","DOIUrl":"https://doi.org/10.1071/mf23167","url":null,"abstract":" ContextGlobally, intermittently closed and open lakes and lagoons (ICOLLs) can constitute highly productive coastal environments that support a range of fisheries. With growing pressures on fish communities, understanding the role of ICOLL management in population dynamics is increasingly important for conservation. AimsTo determine whether the flood-driven management and environmental degradation of New Zealand’s largest coastal lake, Te Waihora–Lake Ellesmere, has created a conflict with the life history of diadromous īnanga, Galaxias maculatus Jenyns, potentially limiting persistence of this species. MethodsThe timing of post-larval migration of īnanga was assessed over 2 years (2021 and 2022) and compared with historic patterns of managed lake openings. Immigrating īnanga individuals were tagged to assess subsequent development, before potential reproductive output was quantified using artificial spawning substrates. Key resultsPeak migration periods were mismatched with the timing of most lake openings. After quickly transiting into tributaries, īnanga seemingly died within a few months. No spawning was detected. Conclusions and implicationsThe mismatch between lake opening management and the annual life history of īnanga prevents the reliable supply of post-larvae needed to sustain a persistent population, with severe environmental degradation being likely to restrict subsequent survival through summer conditions. This study has highlighted the need for management interventions to be tuned to the life histories of at-risk species.","PeriodicalId":18209,"journal":{"name":"Marine and Freshwater Research","volume":"81 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139408936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Salinity as a major influence on groundwater microbial communities in agricultural landscapes 盐度对农业景观中地下水微生物群落的主要影响

IF 1.8 4区环境科学与生态学

Marine and Freshwater Research Pub Date : 2024-01-08 DOI: 10.1071/mf23014

Tess Nelson, Grant C. Hose, Jodie Dabovic, Kathryn L. Korbel

{"title":"Salinity as a major influence on groundwater microbial communities in agricultural landscapes","authors":"Tess Nelson, Grant C. Hose, Jodie Dabovic, Kathryn L. Korbel","doi":"10.1071/mf23014","DOIUrl":"https://doi.org/10.1071/mf23014","url":null,"abstract":" ContextUnderstanding the impacts of salinity on groundwater microbial communities is imperative, because these communities influence groundwater chemistry, quality, and its suitability for use by humans and the environment. AimTo assess groundwater salinisation and its influence on groundwater microbial communities within the Murray–Darling Basin (MDB), Australia. MethodsAlluvial aquifers were sampled from 41 bores, within the Lachlan, Murrumbidgee and Murray catchments. Environmental DNA (eDNA), microbial activity and water-quality variables were measured to evaluate microbial communities, which were then correlated with electrical conductivity (EC) and other environmental variables. ResultsOur results indicated widespread groundwater salinisation within the MDB, with EC ranging from 63 to 51 257 μS cm−1. The highest EC values were recorded in the Murray catchment; however, mean EC values did not differ significantly among catchments (P > 0.05). The composition of microbial communities differed significantly between sites with low (<3000 μS cm−1) and high (>3000 μS cm−1) EC. Microbial activity, richness and abundances were all greater at low- than high-EC sites. ConclusionsChanges to microbial communities as demonstrated here may have impacts on biogeochemical cycling and ecosystem resilience. ImplicationsThe detrimental ecological impacts of salinity are not limited to groundwater microbes, but present a larger ecological issue affecting all groundwater-dependent ecosystems.","PeriodicalId":18209,"journal":{"name":"Marine and Freshwater Research","volume":"96 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139408435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Ineffective artificial mouth-breaching practices and altered hydrology confound eutrophic symptoms in a temporarily closed estuary 无效的人工清口做法和水文变化混淆了一个临时封闭河口的富营养化症状

IF 1.8 4区环境科学与生态学

Marine and Freshwater Research Pub Date : 2023-12-14 DOI: 10.1071/mf23053

Marelé Nel, Janine B. Adams, Lucienne R. D. Human, Monique Nunes, Lara Van Niekerk, Daniel A. Lemley

{"title":"Ineffective artificial mouth-breaching practices and altered hydrology confound eutrophic symptoms in a temporarily closed estuary","authors":"Marelé Nel, Janine B. Adams, Lucienne R. D. Human, Monique Nunes, Lara Van Niekerk, Daniel A. Lemley","doi":"10.1071/mf23053","DOIUrl":"https://doi.org/10.1071/mf23053","url":null,"abstract":" ContextArtificial breaching of intermittently closed estuaries has become more frequent in the face of global-change pressures. AimsThis study aimed to determine whether the ecological health of the Great Brak Estuary has been affected by the prolonged loss of marine connectivity arising from below-average inflow and failed breaching attempts. MethodsWe characterised primary eutrophic symptoms (inorganic nutrients, dissolved oxygen, microalgae) typical of the various mouth states, i.e. open, closed and semi-closed. Key resultsInitially, low inflow and closed mouth conditions facilitated the widespread occurrence of macroalgal blooms (Cladophora glomerata). Phytoplankton bloom conditions (>20 μg Chl-a L−1) ensued only in response to favourable hydrodynamic conditions (e.g. increased water residency, halocline formation) and increased nutrient availability from fluvial sources and macroalgal dieback. These blooms occurred in brackish conditions and comprised numerous taxa, including Cyclotella atomus var. marina, Cryptomonas sp. and Prorocentrum cordatum. Widespread hypoxia (<2 mg L−1) occurred during the semi-closed mouth phase because of the reduced flushing potential associated with the preceding high flow conditions. ConclusionsGlobal-change pressures and ineffective breaching practices will promote eutrophic conditions in intermittently closed estuaries in the future. ImplicationsAllocating sufficient environmental flows is key to preventing ecosystem degradation.","PeriodicalId":18209,"journal":{"name":"Marine and Freshwater Research","volume":"259 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138680581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Lobster predation on barren-forming sea urchins is more prevalent in habitats where small urchins are common: a multi-method diet analysis 在小海胆常见的栖息地，龙虾捕食贫瘠海胆的现象更为普遍：多方法饮食分析

IF 1.8 4区环境科学与生态学

Marine and Freshwater Research Pub Date : 2023-12-07 DOI: 10.1071/mf23140

Jennifer E. Smith, John Keane, Michael Oellermann, Craig Mundy, Caleb Gardner

{"title":"Lobster predation on barren-forming sea urchins is more prevalent in habitats where small urchins are common: a multi-method diet analysis","authors":"Jennifer E. Smith, John Keane, Michael Oellermann, Craig Mundy, Caleb Gardner","doi":"10.1071/mf23140","DOIUrl":"https://doi.org/10.1071/mf23140","url":null,"abstract":" ContextIn Tasmania, Australia, the government’s response to range-extending, barren-forming longspined sea urchin (Centrostephanus rodgersii) includes rebuilding of southern rock lobster (Jasus edwardsii) stocks to increase predation. But lobster preference for native species and continued barren expansion challenges the control efficacy. AimsTo determine the impact of lobster predation on C. rodgersii in different habitats. MethodsMulti-method dietary analysis consisting of stomach contents, faecal DNA and stable isotopes was performed on 64 lobsters from four habitats varying in barren extent and density of urchins and lobsters. Key resultsC. rodgersii contributed to lobster diet in all barren habitats and was found in lobsters of every size class. Stable isotope and DNA analyses showed that C. rodgersii was more common in lobster diet than were targeted native species at incipient barren sites. Surprisingly, in extensive barrens C. rodgersii is less prominent in lobster diet. ConclusionsCombined with site-specific urchin population data, our findings indicated that lobster predation may be less effective at sites where most C. rodgersii individuals have reached a size refuge than at sites dominated by small urchins. ImplicationsLobster predation may provide a useful control for smaller C. rodgersii, but top–down predatory control may be constrained at sites dominated by urchins that exceed the size suitable for lobster predation.","PeriodicalId":18209,"journal":{"name":"Marine and Freshwater Research","volume":"21 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138561148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Effects of mine tailings on aquatic macroinvertebrate structure within the first year after a major dam collapse 大坝溃决后第一年内矿山尾矿对水生大型无脊椎动物结构的影响

IF 1.8 4区环境科学与生态学

Marine and Freshwater Research Pub Date : 2023-12-07 DOI: 10.1071/mf23018

Juliana S. Leal, Bruno E. Soares, Joseph L. S. Ferro, Rafael Dellamare-Silva, Cláudia Teixeira, Virgílio José M. Ferreira Filho, Vinicius F. Farjalla

{"title":"Effects of mine tailings on aquatic macroinvertebrate structure within the first year after a major dam collapse","authors":"Juliana S. Leal, Bruno E. Soares, Joseph L. S. Ferro, Rafael Dellamare-Silva, Cláudia Teixeira, Virgílio José M. Ferreira Filho, Vinicius F. Farjalla","doi":"10.1071/mf23018","DOIUrl":"https://doi.org/10.1071/mf23018","url":null,"abstract":" ContextThe collapse of a tailings dam in Brumadinho (Brazil) is considered one of the largest mining disasters worldwide. The mine tailings polluted the water and sediment of the Paraopeba River downstream of the collapsed dam. The effects of the tailings on biological communities remain unknown. AimsWe evaluated the effects of the tailings dam collapse on aquatic macroinvertebrate assemblages in the Paraopeba River and highlighted a potential bioindicator for the cumulative effects of the mine tailings spill. MethodsWe sampled the macroinvertebrates upstream and downstream of the collapsed dam during the first dry and wet seasons following the collapse. Key resultsWe found that turbidity (likely non-related to the tailings) negatively affected the macroinvertebrates’ abundance, but the richness was negatively affected by the presence of the mine tailings. The riparian land use negatively affected the macroinvertebrate richness and composition. We identified Helicopsyche spp. as a bioindicator. ConclusionsWe provide circumstantial evidence of the effects of mine tailings on aquatic macroinvertebrates, suggesting that it may have affected their richness and caused the loss of Helicopsyche spp. in the most affected sites. ImplicationsWe suggest that the richness and Helicopsyche spp. are potential biomonitoring tools for evaluating the effects of the tailings dam collapse on the macroinvertebrate assemblages.","PeriodicalId":18209,"journal":{"name":"Marine and Freshwater Research","volume":"68 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138561270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Reproductive phenology and the influence of temperature in two sympatric New Zealand freshwater mussel species 新西兰两种同域淡水贻贝的繁殖物候和温度影响

IF 1.8 4区环境科学与生态学

Marine and Freshwater Research Pub Date : 2023-12-01 DOI: 10.1071/mf23072

Michele Melchior, S. Clearwater, Kevin J. Collier

{"title":"Reproductive phenology and the influence of temperature in two sympatric New Zealand freshwater mussel species","authors":"Michele Melchior, S. Clearwater, Kevin J. Collier","doi":"10.1071/mf23072","DOIUrl":"https://doi.org/10.1071/mf23072","url":null,"abstract":"Context Phenology plays a key role in shaping population dynamics, community structure and evolutionary adaptations. For freshwater mussels that rely on a parasitic larval (glochidia) phase on fish, shifts in reproductive phenology driven by environmental conditions may result in mismatches between glochidia release and host fish availability. Aims We investigated intra- and interspecific reproductive timing variations in sympatric Echyridella aucklandica and E. menziesii, and identified thermal cues (accumulated degree days, ADD) associated with brooding and glochidia maturation. Methods Brooding activity and glochidia maturation were assessed fortnightly–monthly over 1 year within four New Zealand streams. Results The previously unknown phenology of E. aucklandica showed earlier brooding (May–July) and longer gravidity (9–11 months) than for E. menziesii (August; 6–7 months). Both species exhibited peak brooding in late austral spring–summer (November–December). ADD played a key role in regulating the timing of brooding onset in both species, as evidenced by the narrow ADD range observed across sites, and the relationship between ADD and brooding onset in both species. Conclusion The demonstrated link between ADD and reproductive phenology has broad implications in the context of climate change. Specifically, it raises concerns about potential timing mismatches in glochidia release and host-fish availability, which could affect the survival and reproductive success of freshwater mussels.","PeriodicalId":18209,"journal":{"name":"Marine and Freshwater Research","volume":"84 s373","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138622083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

An integrated approach for assessing the survival of discarded sandbar sharks, Carcharhinus plumbeus, captured in scientific longlines 一种综合的方法来评估被丢弃的沙洲鲨鱼的生存，Carcharhinus plumbeus是用科学延绳钓捕获的

IF 1.8 4区环境科学与生态学

Marine and Freshwater Research Pub Date : 2023-11-27 DOI: 10.1071/mf22238

Taylor Grosse, Cynthia Awruch, Euan Harvey, Benjamin Saunders, Chris Dowling, Daniela Waltrick, Matias Braccini

{"title":"An integrated approach for assessing the survival of discarded sandbar sharks, Carcharhinus plumbeus, captured in scientific longlines","authors":"Taylor Grosse, Cynthia Awruch, Euan Harvey, Benjamin Saunders, Chris Dowling, Daniela Waltrick, Matias Braccini","doi":"10.1071/mf22238","DOIUrl":"https://doi.org/10.1071/mf22238","url":null,"abstract":" ContextThe sandbar shark (Carcharhinus plumbeus) has a global distribution and is caught by commercial fishers and recreational anglers. AimsTo assess the stress physiology, release condition, and post-release survival of sandbar sharks caught in longline surveys conducted in Western Australia. MethodsPost-release survival of sandbar sharks caught in longlining surveys was assessed using an integrated approach that combined the use of hook-timers, qualitative release conditions, satellite-tagging, and blood physiology. Key resultsOf 57 individuals examined, there was 100% post-capture survival after a maximum of 4 h on the hook. Most of these animals (88%) displayed a strong release condition, exhibiting minimal behavioural impairment. All 13 satellite-tagged individuals survived 30 days post-capture. Sharks dived up to 307 m deep and showed cyclical depth movement patterns, with some individuals moving through the water column both day and night, whereas others moved almost exclusively at night. The concentration of blood metabolites did not significantly change with time-on-hook. ConclusionPost-capture and post-release survival of 100% after up to 4 h on hooks suggested that the use of longlines for surveying sandbar shark abundance had no deleterious effects on captured sharks. ImplicationThis will support future stock assessments of sharks by quantifying the survival rates in the methods used for long-term monitoring of sandbar shark populations.","PeriodicalId":18209,"journal":{"name":"Marine and Freshwater Research","volume":"107 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138516545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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