Zooplankton growth rates: the influence of size and resources in tropical marine copepodites

被引:52
|
作者
Hopcroft, RR
Roff, JC
Webber, MK
Witt, JDS
机构
[1] Univ Guelph, Dept Zool, Guelph, ON N1G 2W1, Canada
[2] Univ W Indies, Dept Zool, Mona, Jamaica
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1007/s002270050372
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Growth rates were determined for copepodites of the genera: Acartia, Centropages, Corycaeus, Oithona, Paracalanus, Parvocalanus and Temora in nearshore waters of Jamaica from in situ microcosm incubations. At these high local temperatures (similar to 28 degrees C), total copepodite development time was as short as 4 to 5 d. Mean instantaneous growth rates (g) ranged from as high as 1.2 d(-1) to as low as 0.1 d(-1). In general, cyclopoid copepods appeared to grow more slowly than calanoids of the same size. Enhancement of resources by nutrient addition caused a 32% increase in growth rates in experiments from a mesotrophic site, but only a 17% increase at a more eutrophic site. Additionally, copepodites at both sites showed faster development and generally larger size at stage in response to nutrient addition. Growth rates were positively related to chlorophyll concentration in the >2 mu m size-fraction. A significant relationship of growth rate to body size (r(2) = 0.45) emerged across a wide range of trophic status, but it was confounded with resource availability. It appears that growth in tropical copepod copepodites may be frequently limited by resources in a size-dependent manner.
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页码:67 / 77
页数:11
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