Freshwater Crayfish最新文献_第3页

Relaxed attitude towards spreading of alien crayfish species affects protection of native crayfish species: case studies and lessons learnt from a Fennoscandian viewpoint 对外来小龙虾物种传播的放松态度影响了对本地小龙虾物种的保护：案例研究和从芬诺斯坎迪观点吸取的教训

IF 0.8

Freshwater Crayfish Pub Date : 2020-04-15 DOI: 10.5869/fc.2020.v25-1.039

J. Jussila, L. Edsman

{"title":"Relaxed attitude towards spreading of alien crayfish species affects protection of native crayfish species: case studies and lessons learnt from a Fennoscandian viewpoint","authors":"J. Jussila, L. Edsman","doi":"10.5869/fc.2020.v25-1.039","DOIUrl":"https://doi.org/10.5869/fc.2020.v25-1.039","url":null,"abstract":"\u0000 The spreading of the alien signal crayfish (Pacifastacus leniusculus) is posing an ongoing threat to native European crayfish species in Fennoscandia, like the native noble crayfish (Astacus astacus). The signal crayfish is commonly a chronic carrier of the crayfish plague (Aphanomyces astaci), thus, in addition to being more competitive than noble crayfish, it also has a competitive advantage in this disease over the noble crayfish. The challenges rising from the introduction of the alien signal crayfish to Sweden, Finland and finally also Norway, are similar in nature. The licensed and unlicensed spreading of this species also has a similar history in these countries. In this paper we describe some of the patters of the spread of alien signal crayfish and highlight the detrimental nature of an alien crayfish, accompanied by a highly virulent disease, to native Fennoscandian crayfish and also to native Fennoscandian ecosystems. A halt to the further spreading of alien signal crayfish in Fennoscandia is the only means to ensure successful conservation outcomes for the noble crayfish.","PeriodicalId":29940,"journal":{"name":"Freshwater Crayfish","volume":"1 1","pages":""},"PeriodicalIF":0.8,"publicationDate":"2020-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46905259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Life History of the Endemic Saddleback Crayfish, Faxonius medius (Faxon, 1884), (Decapoda: Cambaridae) in Missouri, USA 美国密苏里州特有的鞍背小龙虾Faxonius medius (Faxon, 1884)，(十足目:驼背科)的生活史

IF 0.8

Freshwater Crayfish Pub Date : 2019-02-28 DOI: 10.5869/FC.2019.V24-1.1

R. DiStefano, J. Westhoff, Christopher J. Rice, A. Rosenberger

{"title":"Life History of the Endemic Saddleback Crayfish, Faxonius medius (Faxon, 1884), (Decapoda: Cambaridae) in Missouri, USA","authors":"R. DiStefano, J. Westhoff, Christopher J. Rice, A. Rosenberger","doi":"10.5869/FC.2019.V24-1.1","DOIUrl":"https://doi.org/10.5869/FC.2019.V24-1.1","url":null,"abstract":"\u0000 The saddleback crayfish, Faxonius medius (Faxon, 1884), is endemic to a single drainage in eastern Missouri, USA, that is affected by heavy metals mining, and adjacent to a rapidly-expanding urban area. We studied populations of F. medius in two small streams for 18 months to describe the annual reproductive cycle and gather information about fecundity, sex ratio, size at maturity, and size-class structure. We also obtained information about the speciesâ€™ density at supplemental sites. The species, though rare in a geographic context, is locally abundant; we captured a monthly average of more than 75 F. medius from each of the two study populations. Densities of F. medius were high relative to several sympatric species of Faxonius Cope, 1872 and Cambarus Erichson, 1846. The species exhibited traits of an r-strategist life history; it was relatively short-lived and early to maturity. Its fecundity and egg size were comparable to Ozark congeners. Breeding season occurred in autumn, perhaps extending into early winter. Egg brooding occurred primarily in April. Young-of-year first appeared in samples in June. We estimated that these populations contained 2 to 3 size-classes, and most individuals became sexually mature in their first year of life. Life history information presented herein will be important for future conservation efforts.","PeriodicalId":29940,"journal":{"name":"Freshwater Crayfish","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48300104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Sexual Dichromatism of “Rusty” Spots in a Population of Faxonius rusticus (Girard) 黄褐法虱种群“锈斑”的性别二色性

IF 0.8

Freshwater Crayfish Pub Date : 2019-02-28 DOI: 10.5869/FC.2019.V24-1.39

Sean M. Hartzell

引用次数: 0

Body Size in Freshwater Crayfish: An Intercontinental Comparison 淡水小龙虾的体型:洲际比较

IF 0.8

Freshwater Crayfish Pub Date : 2019-02-28 DOI: 10.5869/FC.2019.V24-1.43

A. Richardson

引用次数: 2

Geographical Variation in the Giant Freshwater Crayfish, Astacopsis gouldi: Deductions from a Large Opportunistic Database 巨型淡水小龙虾Astacopsis gouldi的地理变异：来自大型机遇数据库的推断

IF 0.8

Freshwater Crayfish Pub Date : 2019-02-28 DOI: 10.5869/FC.2019.V24-1.15

A. Richardson, T. S. Walsh

引用次数: 0

The Distribution and Conservation Status of the White Colour Morph of Faxonius propinquus (Northern Clearwater Crayfish) in Lake Simcoe, Ontario, Canada 加拿大安大略省西姆科湖北部清水小龙虾(Faxonius propinquus)白色形态的分布与保护现状

IF 0.8

Freshwater Crayfish Pub Date : 2019-02-28 DOI: 10.5869/FC.2019.V24-1.33

P. Hamr, M. Hoel, Kathryn L. Eales

引用次数: 3

Flood pulse characteristics and physicochemical influences on harvested Procambarus clarkii and Procambarus zonangulus populations in the Atchafalaya River basin, Louisiana 路易斯安那州Atchafalaya河流域洪水脉冲特征及其对收获的克氏原江豚和带状原江豚种群的物理化学影响

IF 0.8

Freshwater Crayfish Pub Date : 2019-02-28 DOI: 10.5869/FC.2019.V24-1.23

Lauren Kong, Alex Ballinger, C. Bonvillain

{"title":"Flood pulse characteristics and physicochemical influences on harvested Procambarus clarkii and Procambarus zonangulus populations in the Atchafalaya River basin, Louisiana","authors":"Lauren Kong, Alex Ballinger, C. Bonvillain","doi":"10.5869/FC.2019.V24-1.23","DOIUrl":"https://doi.org/10.5869/FC.2019.V24-1.23","url":null,"abstract":"\u0000 The majority of Louisiana’s wild crayfish landings are harvested from the Atchafalaya River Basin (ARB) during floodplain inundation from the annual flood pulse. Spatial and temporal heterogeneity in ARB physicochemical characteristics are associated with flood pulse characteristics and floodplain inundation, and extensive areas of the ARB experience environmental hypoxia (dissolved oxygen [DO] < 2.0 mg·L-1) for several weeks to months during the annual flood pulse. The purpose of this research was to evaluate the effects of flood pulse characteristics and physicochemistry on harvested crayfish populations at 14 sites in the ARB that were sampled biweekly during the 2016 and 2017 crayfish seasons. Despite dissimilar 2016 and 2017 flood pulse characteristics, red swamp crawfish Procambarus clarkii and southern white river crawfish P. zonangulus carapace length and CPUE were similar between sample years. Comparisons of P. clarkii populations among physicochemical location groupings indicated that DO concentration, particularly chronically hypoxic water, is the principal abiotic variable influencing P. clarkii population characteristics. Although not significant, normoxic locations produced larger crayfish and yielded higher CPUE values for the majority of both crayfish seasons. Furthermore, hemolymph protein concentrations in P. clarkii from normoxic areas were significantly and consistently higher than individuals from chronically hypoxic locations.","PeriodicalId":29940,"journal":{"name":"Freshwater Crayfish","volume":" ","pages":""},"PeriodicalIF":0.8,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48341768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3