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Dietary effects on life history traits of riverine Bosmina
Author(s) -
ACHARYA KUMUD,
JACK JEFFREY D.,
BUKAVECKAS PAUL A.
Publication year - 2005
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.2005.01379.x
Subject(s) - seston , bosmina , fecundity , biology , polyunsaturated fatty acid , branchiopoda , scenedesmus , zooplankton , eicosapentaenoic acid , cladocera , ecology , zoology , botany , fatty acid , algae , phytoplankton , population , biochemistry , demography , sociology , nutrient
Summary 1. We compared growth, reproduction and life history characteristics of Bosmina raised on Ohio River seston versus a unialgal culture ( Scenedesmus acutus ), to assess potential nutritional constraints experienced by riverine populations. 2. Bosmina grew well in both treatments during their juvenile stage. Analysis of variance showed that Bosmina growth prior to the start of reproduction did not differ significantly between the treatments. After the onset of reproduction Bosmina fed on Scenedesmus grew faster and exhibited higher fecundity than their counterparts fed river seston. 3. Significant quantities of triacylglycerol (visible lipid droplets) were gradually accumulated in Bosmina fed on Scenedesmus . Visual lipid ovary indices were positively correlated with adult growth rate and fecundity and negatively correlated with longevity. 4. Biochemical analysis showed that Scenedesmus had significantly greater total ω 3, ω 6 and polyunsaturated fatty acids (PUFA) whereas river seston had more eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). Thus, in contrast to Daphnia , EPA and DHA do not appear to influence Bosmina growth or reproductive performance, but linolenic acid or total PUFA may be important. 5. Comparatively weak performance by Bosmina feeding on river seston suggest that nutritional constraints may be important despite high particulate organic carbon and low C : N and C : P of river seston.