Effects of temperature and food abundance on grazing and short-term weight change in the marine copepod Acartia hudsonica

  • Durbin E
  • Durbin A
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Abstract

Ingestion and short-term weight change in adult female Acartia hudsonica were investigated at 4.5 degree , 8 degree , 12 degree , and 16 degree C with the solitary diatom Thalassiosira constricta as food. Narragansett Bay copepods were preadapted to the desired temperature and saturating food level for 3 d to standardize feeding history before the experiments. Maximal ingestion rates at the four temperatures were 16,460, 14,120, 21,470, and 29,960 cells copepod super(-1)d super(-1) or 43.9, 37.2, 67.9, and 92.9% body C (Q sub(10) = 2.3) and 34.2, 30.7, 42.6, and 74.7% body N d super(-1) (Q sub(10) = 2.4). The critical concentration varied between 840 and 1,900 cells/ml (0.17-0.23 mu g C/ml) and was not significantly related to temperature. Maximal clearance rate was similar at all temperatures (20.8-23.9 ml/copepod/d), but on a weight-specific basis increased from 3.3 to 6.0 ml ( mu g copepod C) super(-1)/d between 4.5 degree and 16 degree C (Q sub(10) = 1.8). Feeding rates at 4.5 degree and 8 degree C were similar; the seemingly low ingestion rates at 8 degree C were interpreted as evidence for a senescent population of adult copepods in the bay from late April to early May

Author-supplied keywords

  • Acartia
  • Acartia hudsonica
  • Autecology: Environmental effects 1422
  • Autecology: Nutrition and feeding habits 1425
  • Carcinology: General 1281
  • Narragansett Bay
  • Thalassiosira
  • Thalassiosira constricta
  • abundance
  • body weight
  • copepod
  • copepods
  • feeding
  • food
  • food availability
  • food consumption
  • grazing
  • ingestion
  • ingestion rates
  • marine
  • rate
  • temperature
  • temperature effects
  • water temperature

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Authors

  • E G Durbin

  • A G Durbin

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