Effect of growth on reproduction in the freshwater amphipod, Hyalella azteca (Saussure)

Abstract

A gradient in H. azteca growth was created by reducing food ration. Tests were initiated with neonates (≤48 h old) and the effects of an altered food ration on survival and growth were examined after 10 and 49 days. Growth rates decreased significantly with reduced food ration (10 day growth rates ranged from 1.2 µg d−1 in the highest feeding regime to 0.5 µg d−1 in lowest feeding regime). Survival after 10 days was not affected by ration, ranging from 86 to 96%. A growth rate of 1.2 µg d−1 at day 10 resulted in mean dry weight (1.0 mg), survival (62%) and reproduction (9.3 neonates/female) at day 49 similar to reported values for this species. Growth rates ≤0.9 µg d−1 at day 10 corresponded to significantly reduced reproduction at day 49 (i.e., < 1 neonate per female). Time to the onset of amplexus increased with decreasing ration suggesting reduced ration may have delayed reproduction.

DOI: 10.1007/BF00018709

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Cite this paper

@article{Moore2004EffectOG, title={Effect of growth on reproduction in the freshwater amphipod, Hyalella azteca (Saussure)}, author={David W. Moore and J. Daniel Farrar}, journal={Hydrobiologia}, year={2004}, volume={328}, pages={127-134} }