Guevara Emma, Alvarez Hernán, Mascaró Maite, Rosas Carlos, Sánchez Alberto
Universidad Autónoma del Carmen, Ave. Concordia, no. 4, Cd. del Carmen, Camp., México.
Rev Biol Trop. 2007 Sep-Dec;55(3-4):989-1004.
In Campeche, Mexico, the Laguna de Términos has Thalassia testudinum beds inhabited by the grey snapper, Lutjanus griseus (Linnaeus 1758). Along one year, we collected 994 individuals and 672 had food in their stomachs; we recorded number, weight, and frequency oftrophic groups, and the index of relative importance. Dominant food components were Farfantepenaeus duorarum and Palemonetes octaviae, Eucinostomus gula (Cuvier 1830) and Libinia dubia. Salinity and temperature were related to the number of individuals collected and with greater fish consumption by large L. griseus. The trophic niche breadth index was calculated for six size-classes of fish. The smallest and the largest fish had the lowest index values, whereas medium-size snappers had higher values. This snapper has a preference for habitats with submerged vegetation. The percentage of fish with food in their stomachs was higher during dark hours, providing evidence of the nocturnal habits of this fish.
在墨西哥坎佩切州，特尔米诺斯泻湖中有生长着泰来藻的海床，这里栖息着灰笛鲷（Lutjanus griseus，林奈，1758年）。在一年的时间里，我们收集了994条个体，其中672条胃中有食物；我们记录了食物种类的数量、重量和出现频率，以及相对重要性指数。主要食物成分有桃红对虾和八腕长臂虾、银口钻嘴鱼（居维叶，1830年）和多棘豆蟹。盐度和温度与采集到的个体数量有关，并且大型灰笛鲷的鱼类消费量更大。我们计算了六个体长等级鱼类的营养生态位宽度指数。最小和最大的鱼的指数值最低，而中等大小的笛鲷指数值较高。这种笛鲷偏爱有水下植被的栖息地。胃中有食物的鱼的比例在夜间更高，这证明了这种鱼的夜行习性。
