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| Comparative ecology of the copepods Calanoides carinatus and Calanus agulhensis - the influence of temperature and food |  |
| Huggett, J.A.; Richardson, A.J.; Field, J. (2007). Comparative ecology of the copepods Calanoides carinatus and Calanus agulhensis - the influence of temperature and food Afr. J. Mar. Sci. 29(3): 473-490 |
| In: African Journal of Marine Science. NISC: Grahamstown. ISSN 1814-232X , meer |
| Abstract |
Hypotheses regarding temperature, food abundance and food size were tested to explore niche separation between Calanoides carinatus, an abundant copepod in the cool and food-rich southern Benguela upwelling system, and Calanus agulhensis, the dominant copepod on the warmer, relatively food-poor Agulhas Bank off the south coast of South Africa. Under non-limiting food conditions, egg production by both species increased linearly with temperatures between 9°C and 18°C. Egg production by C. carinatus was relatively faster at 21°C, but was offset by greater mortality. Both species showed similar functional responses to food concentration in the field, reaching satiation at ~15mg Chl a m-3, or ~3-4ppm. Food abundance was the most important predictor of egg production, whether measured as Chl a or as particle volume. |
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