Evaluating the effect of lake calcium concentration on the acquisition of carapace calcium by freshwater crayfish

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• 作者：Brie A. Edwards (1)
  Donald A. Jackson (1)
  Keith M. Somers (1) (2)
  
• 关键词：Calcium limitation ; Crayfish carapace ; Crustacea ; Lake Ca ; Canadian shield
• 刊名：Hydrobiologia
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：744
• 期：1
• 页码：91-100
• 全文大小：417 KB
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• 作者单位：Brie A. Edwards (1)
  Donald A. Jackson (1)
  Keith M. Somers (1) (2)
  
  1. Department of Ecology and Evolutionary Biology, University of Toronto, 25 Harbord Street, Toronto, ON, M5S 3G5, Canada
  2. Ontario Ministry of the Environment, Environmental Monitoring and Reporting, Dorset Environmental Science Centre, 1026 Bellwood Acres Road, Dorset, ON, P0A 1E0, Canada
  
• ISSN：1573-5117

文摘

Aquatic systems in many parts of the world, including those on the Canadian Shield in central Ontario, Canada, are facing severe declines in aquatic calcium (Ca). The relationship between the Ca content of the carapace of freshwater crayfish, Orconectes virilis, O. rusticus and Cambarus bartonii, and lake Ca concentration was statistically evaluated across a broad [Ca] range in south-central Ontario. Carapace Ca content was significantly positively related to lake [Ca] in O. virilis but not C. bartonii or O. rusticus, probably because the latter two were only sampled over a comparatively small range of lake [Ca]. We evaluated additional variation in carapace Ca content potentially explained by the characteristics of O. virilis individuals, including size (carapace length), sex, and hardness (rigidity), using multiple linear regression. The carapace Ca content of O. virilis was significantly positively related to the hardness of the carapace, and to a lesser extent the size of the individual. For O. virilis, lake [Ca] appears to limit carapace Ca acquisition below approximately 8?mg?l?. O. virilis is therefore experiencing stress due to low [Ca] in the majority of soft-water boreal lakes where it occurs because they are undergoing [Ca] decline.