César I I, Armendáriz L C
División Zoología Invertebrados, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, La Plata, Argentina.
Braz J Biol. 2007 May;67(2):235-41. doi: 10.1590/s1519-69842007000200008.
Secondary production of Chasmagnathus granulatus was calculated at the Refugio de Vida Silvestre Bahía Samborombón, Argentina (36 degrees 16' S and 57 degrees 06' W). Sampling was conducted on nine occasions between March 2001 and February 2003, crabs were collected by hand, physico-chemical variables, granulometry and organic matter contents of the sediments were registered. Crabs were classified as male, female and undifferentiated, measured (total carapace width: CW) and weighed (wet and dry weight: DW at 60 degrees C, during 48 hours). A correlation analysis between CW and DW was made. Morphometric growth of C. granulatus was by the application of the power function (y = a x (b)), where the carapace width (CW) was used as an independent variable. Males, females and undifferentiated individuals were analysed separately as well as all together as a group. The data were fitted indicating a positive allometry (constant of allometry b > 3), the males showing the greatest allometric value. The individuals (n = 957 juveniles and adults) were separated in cohorts by the polymodal width-frequency distribution converted into normal curves. Three cohorts were found during the whole study period, and two cohorts coexisting in each sampling date. Ovigerous females were caught on December 2001, 2002 and February 2003. The size-frequency method was used to estimate the annual production. The major contribution to production was carried out by the mature individuals, in particular those with size between 25 and 30 mm, but on the other hand, only few individuals measuring from 10 to 20 mm were collected. The annual production of C. granulatus was estimated in 7.76 g.m(-2). The biomass (expressed as total dry weight) varied between 0.55 and 1.85 g.m(-2), with the greater values being registered during autumn and spring, and the lower values during summer.
在阿根廷的巴伊亚桑博罗蒙保护区（南纬36度16分，西经57度06分）计算了颗粒厚蟹的次级生产量。在2001年3月至2003年2月期间进行了9次采样，通过手工采集螃蟹，记录沉积物的理化变量、粒度和有机质含量。螃蟹被分为雄性、雌性和未分化个体，进行测量（甲壳总宽度：CW）和称重（湿重和干重：60摄氏度下48小时的DW）。对CW和DW进行了相关性分析。颗粒厚蟹的形态测量生长通过应用幂函数（y = a x (b)）进行，其中甲壳宽度（CW）用作自变量。对雄性、雌性和未分化个体分别进行分析，也将它们作为一个整体进行分析。数据拟合表明为正异速生长（异速生长常数b > 3），雄性显示出最大的异速生长值。通过将多峰宽度频率分布转换为正态曲线，将个体（n = 957只幼体和成体）按年龄组分开。在整个研究期间发现了三个年龄组，每个采样日期有两个年龄组共存。在2001年12月、2002年和2003年2月捕获了抱卵雌蟹。使用大小频率法估计年产量。对产量的主要贡献来自成熟个体，特别是那些大小在25至30毫米之间的个体，但另一方面，仅收集到很少的大小在10至20毫米之间个体。颗粒厚蟹的年产量估计为7.76 g·m(-2)。生物量（以总干重表示）在0.55至1.85 g·m(-2)之间变化，秋季和春季的值较高，夏季的值较低。
