Methods of extinction risk assessment developed for US West Coast salmon     

Wainwright  T. C.; Kope  R. G. 《ICES Journal of Marine Science》1999,56(4):444-448

  相似文献   

The incidence of escaped farmed Atlantic salmon, Salmo salar L., in the Faroese fishery and estimates of catches of wild salmon     

Hansen  L. P.; Jacobsen  J. A.; Lund  R. A. 《ICES Journal of Marine Science》1999,56(2):200-206

  相似文献   

Depletion and extinction of Pacific salmon (Oncorhynchus spp.): A different perspective     

Lichatowich  J.; Mobrand  L.; Lestelle  L. 《ICES Journal of Marine Science》1999,56(4):467-472

  相似文献   

Stream temperature response to variable glacier coverage in coastal watersheds of Southeast Alaska   总被引：1，自引：0，他引：1       下载免费PDF全文

Jason B. Fellman  Sonia Nagorski  Sanjay Pyare  Andrew W. Vermilyea  Durelle Scott  Eran Hood 《水文研究》2014,28(4):2062-2073

We measured stream temperature continuously during the 2011 summer run‐off season (May through October) in nine watersheds of Southeast Alaska that provide spawning habitat for Pacific salmon. The nine watersheds have glacier coverage ranging from 0% to 63%. Our goal was to determine how air temperature and watershed land cover, particularly glacier coverage, influence stream temperature across the seasonal glacial meltwater hydrograph. Multiple linear regression models identified mean watershed elevation (related to glacier extent) and watershed lake coverage (%) as the strongest landscape controls on mean monthly stream temperature, with the weakest (May) and strongest (July) models explaining 86% and 97% of the temperature variability, respectively. Mean weekly stream temperature was significantly correlated with mean weekly air temperature in seven streams; however, the relationships were weak to non‐significant in the streams influenced by glacial run‐off. Streams with >30% glacier coverage showed decreasing stream temperatures with rising summer air temperatures, whereas those with <30% glacier coverage exhibited summertime warming. Glaciers also had a cooling effect on monthly mean stream temperature during the summer (July through September) equivalent to a decrease of 1.1 °C for each 10% increase in glacier coverage. The maximum weekly average temperature (an index of thermal suitability for salmon) in the six glacial streams was substantially below the lower threshold for optimum salmon growth. This finding suggests that although glaciers are important for moderating summer stream temperatures, future reductions in glacier run‐off may actually improve the thermal suitability of some glacially dominated streams in Southeast Alaska for salmon. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献   

Polychlorinated biphenyl (PCB) concentrations and congener composition in masu salmon from Japan: A study of all 209 PCB congeners by high-resolution gas chromatography/high-resolution mass spectrometry (HRGC/HRMS)     

Reiko Matsumoto  Nguyen Phuc Cam Tu  Shinsuke Haruta  Masahide Kawano  Ichiro Takeuchi 《Marine pollution bulletin》2014

We collected two subspecies of masu salmon: Oncorhynchus masou masou from four localities (southern Sea of Japan northward to Hokkaido) and O. masou ishikawae from upstream from Ise Bay close to a heavy industrial area. All 209 PCB congeners were analyzed using HRGC/HRMS. PCA ordination of congener concentrations divided data into three groups: (i) ssp. masou from Hokkaido, (ii) ssp. masou from the other regions and (iii) ssp. ishikawae. The highest ∑ PCB concentration (40.39 ng/wet wt) was in ssp. ishikawae followed by ssp. masou from southern waters; however the TEQ_{dioxin-like PCBs} was highest in ssp. masou from southern water (1.96 pg-TEQ_{dioxin-like PCBs}/g wet wt.) due to the high proportion of congener #126 in its complement (#126 has the highest toxic equivalency factor among congeners). There is likely a contamination source offshore in the southern Sea of Japan and/or along the migratory route of ssp. masou.  相似文献   

Modelling storage‐driven connectivity between landscapes and riverscapes: towards a simple framework for long‐term ecohydrological assessment          下载免费PDF全文

C. Soulsby  C. Birkel  D. Tetzlaff 《水文研究》2016,30(14):2482-2497

The importance of conceptualizing the dynamics of storage‐driven saturation area connectivity in runoff generation has been central to the development of TOPMODEL and similar low parameterized rainfall–runoff models. In this contribution, we show how we developed a 40‐year hydrometric data base to simulate storage–discharge relationships in the Girnock catchment in the Scottish Highlands using a simple conceptual model. The catchment is a unique fisheries reference site where Atlantic salmon populations have been monitored since 1966. The modelling allowed us to track storage dynamics in hillslopes, the riparian zone and groundwater, and explicitly link non‐linear changes of streamflows to landscape storage and connectivity dynamics. This provides a fundamental basis for understanding how the landscape and riverscape are hydrologically connected and how this regulates in‐stream hydraulic conditions that directly influence salmonids. We use the model to simulate storage and discharge dynamics over the 40‐year period of fisheries records. The modelled storage‐driven connectivity provides an ecohydological context for understanding the dynamics in stream flow generation which determine habitat hydraulics for different life stages of salmon population. This new, long‐term modelling now sets this variability in the riverscape in a more fundamental context of the inter‐relationships between storage in the landscape and stream flow generation. This provides a simple, robust framework for future ecohydrological modelling at this site, which is an alternative to more increasingly popular but highly parameterized and uncertain commercial ecohydrological models. It also provides a wider, novel context that is a prerequisite for any model‐based scenario assessment of likely impacts resulting from climate or land use change. Copyright © 2016 The Authors Hydrological Processes Published by John Wiley & Sons Ltd. Copyright © 2016 The Authors Hydrological Processes Published by John Wiley & Sons Ltd.  相似文献   

兔抗鲑鱼降钙素抗血清的制备与鉴定   总被引：1，自引：1，他引：0  

张宝红  张学成  臧晓南 《中国海洋大学学报(自然科学版)》2005,35(3):507-510

探讨降钙素抗血清制备的简便方法,用IPTG诱导重组鲑鱼降钙素(sCT)基因工程菌BL21(pGEX-4T—sCT),超声波裂解后,用亲和层析凝胶纯化蛋白GsT—sCT,并以此融合蛋白为抗原制备抗血清。实验证明：降钙素是1种半抗原;大肠杆菌表达的融合蛋白GST—sCT只具有鲑鱼降钙素免疫原性,而无谷胱甘肽免疫原性。经鉴定,制备的免疫血清具有良好的特异性和敏感性。  相似文献   

Formalizing expert knowledge to compare alternative management plans: Sociological perspective to the future management of Baltic salmon stocks     

Päivi Haapasaari  Timo P. Karjalainen 《Marine Policy》2010

Designing and implementing long-term management plans is difficult both because of the complexity of the fisheries system, and the behaviour of humans. We compared four alternative management plans for the Baltic salmon stocks through approaching experts who interpreted and expressed the views of different stakeholder groups on the options. The focus of the study was on stakeholders’ commitment to the alternative management plans. Committing enhances the probability of achieving the ultimate objective of a plan, while if stakeholders do not commit, the effects of the plan may be less predictable. Thus commitment is an important part of implementation uncertainty in fisheries management. We present how we coupled qualitative analysis with probabilistic Bayesian networks in analysing expert knowledge related to alternative long term management plans in terms of group commitment. Using a Bayesian net provides potential for creating a holistic picture of a fishery by combining the data describing fishers’ commitment with biological data regarding fish stock dynamics and with economic data analyzing economically sound fisheries management.  相似文献   

Introducing run-size driven fisheries management for the coastal fishery of Atlantic salmon: Preseason forecasts for policy makers     

Petri Suuronen  Pekka Jounela 《Marine Policy》2010

The Finnish coastal fishery of Atlantic salmon (Salmo salar) in the northern Baltic Sea is regulated using multi-annual, pre-fixed, opening dates of harvests that aim to enhance spawning escapement of early migrating wild salmon. Such an inflexible management regime does not set regulations that track varying run sizes of salmon. We introduce an array of computational intelligence techniques to estimate and forecast coastal run size and escapement of salmon into three spawning rivers in the northern Baltic Sea. Our results indicated that the present management pattern, driven largely by regional fisheries policy, contrasts greatly with a “run-size driven” (i.e. abundance-based) management approach. Introducing run-size driven management, i.e. setting regulations annually by tracking preseason forecasts, would better ensure adequate escapement and at the same time allow the maintenance of coastal catch at sustainable level. Setting regulations annually would allow effective harvesting in years when the run is high, and would effectively restrict harvests when the run is low.  相似文献   

气候变化对鲑鱼丰富度和繁殖影响的研究进展     

王志萍  李家薰  Dave Fillion  霍耀明  周文慧 《海洋科学》2019,43(4):98-104

鲑鱼是人类重要的食品来源之一,具有巨大的经济价值。同时,鲑鱼资源通过输送营养物质对维持溪流和陆地生态系统的结构、功能和过程等有重要作用。而鲑鱼是对温度极为敏感的冷水性鱼类,对气候变化的反应尤为明显。作者通过文献综述法梳理相关研究,从气候变化引起的温度变化、淡水和海洋环境的变化以及鱼病传播4个方面探讨对鲑鱼丰富度和繁殖的影响,并提出研究展望。研究显示:温度变化对鲑鱼的产卵和迁徙有较大影响;溪流和河流流量的改变会影响鲑鱼的迁徙和幼年鲑鱼的存活数量;温度和二氧化碳浓度的变化使海洋食物供应减少,鲑鱼丰富度降低;水温的升高使病原体增加,鲑鱼死亡率增加。本研究成果可为鲑鱼种群应对气候变化的研究及管理提供一定的理论支持。  相似文献