Tracing the origins of Calanus sp. in the Saguenay‑St. Lawrence Marine Park (Québec, Canada) using δ13C as a marker

The Saguenay-St. Lawrence Marine Park (SSLMP) is a region that sustains a high abundance of zooplankton. The connectivity between zooplankton populations within the SSLMP and the surrounding areas was investigated for Calanus finmarchicus and C. hyperboreus. Deep-dwelling stage V copepodites (CVs) were collected in the Marine Park as well as in putative source regions in the St. Lawrence system in July 2009 (a time when they were entering into diapause). In May 2010, at the end of the overwintering period, diapausing CVs were sampled again in the Marine Park. To discriminate the origins and to predict the probable regions of origin of these deep-dwelling diapausing CVs in the SSLMP, a quadratic discriminant function analysis (QDFA) was performed. The classification algorithm was based on the carbon isotopic composition (δ13C) and percent carbon (%C) of individual copepods, as these variables are conservative when lipids are extracted prior to analysis. Our results suggest that about 23%...萨格奈-圣劳伦斯海洋公园（Saguenay-St. Lawrence Marine Park, SSLMP）是一处维持着极高浮游动物丰度的海域。针对芬马克哲水蚤（Calanus finmarchicus）与北极哲水蚤（Calanus hyperboreus），本研究对SSLMP内部及周边区域的浮游动物种群连通性展开了调查。2009年7月，正值这些桡足类进入滞育的时期，研究人员在该海洋公园以及圣劳伦斯水系的推定源区采集了深水栖息的第V期桡足幼体（stage V copepodites，以下简称CVs）。2010年5月，即越冬期结束时，研究人员再次在该海洋公园内对滞育状态的CVs进行了采样。为甄别这些滞育CVs的起源并预测其可能的来源区域，本研究实施了二次判别函数分析（quadratic discriminant function analysis, QDFA）。该分类算法以单个桡足类的碳同位素组成（δ¹³C）与碳百分含量（%C）为依据，因为在分析前提取脂质后，这两类变量具有保守性。研究结果表明，约23%……