On the Spinicaudata (Branchiopoda) from Lake Cuitzeo, Michoacán, México: First report of a clam shrimp fishery

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• 作者：Mar铆a Araceli Mart铆nez-Pantoja ; Javier Alcocer and Alejandro M. Maeda-Mart铆nez
• 关键词：conchilla ; Eocyzicus digueti ; Leptestheria compleximanus ; tropical lake ; shallow lake ; turbid lake ; ephemeral lake ; saline lake ; astatic lake ; soda ; alkaline lake ; fisheries ; Central Mé ; xico
• 刊名：Hydrobiologia
• 出版年：2002
• 出版时间：October, 2002
• 年：2002
• 卷：486
• 期：1
• 页码：207-213
• 全文大小：278.7 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Hydrobiology
  Ecology
  
• 出版者：Springer Netherlands
• ISSN：1573-5117

文摘

Cuitzeo is the second largest lake in México (ca. 425 km2). Indigenous people collect clam shrimp (locally known as `conchilla') and sell them dry as pets' food; the income is important for the local economy. To our knowledge, this is the first report of a clam shrimp fishery. Two conchilla species co-occur: Eocyzicus digueti (Richard) and Leptestheria compleximanus (Packard). They were restricted to the saline, soda-alkaline, and temporally astatic W and NW portions of the lake. E. digueti constituted 70% of the total clam shrimp abundance, and L. compleximanus the remainder. Populations were dominated by juveniles, followed by females and males, with sex ratios (male:female) of 1:1.2 to 1:1.4. E. digueti was larger (3–11 mm) than L. compleximanus (3–8.5 mm), and males were larger than females in both species. There were highly significant correlations between carapace size and the number of growth lines and carapace size and the number of eggs. Although previously reported from México, both species are new records for Lake Cuitzeo and for Michoacán state.