Feeding ecology of the crab Cancer polyodon in La Herradura Bay, northern Chile. I. Feeding chronology, food intake, and gross growth and ecological efficiency
Feeding activity pattern and food intake of the crab Cancer polyodon were determined from crab stomach samples taken at 3 to 4 h intervals on 2 days per season in 1988 and 1989. The gross growth efficiency (K1) and the ecological (= population production) efficiency (EE) were calculated in conjunction with growth and production data from a previous study. C. polyodon feeds at night and to a lesser extent during the day. Feeding chronology differed markedly among seasons: in winter, night feeding lasted about twice as long (13 to 15 h) as in spring, but maximum stomach fullness reached only 0.35 % BW (body weight) compared to 0.62 % BW in spring. Summer feeding resembled the spring pattern and autumn feeding the winter pattern. Daily food intake was estimated from the stomach content data and a laboratory-derived evacuation rate using the Elliott & Persson model. Daily rations increased from 2.8 (+/- 0.71) % BW in winter to 4.4 (+/- 0.64) % BW in summer and decreased to 2.7 (+/- 0.37) % BW in autumn (annual average: 3.19 % BW). K1 (weight gain as % of total food ingested) was lower for females (5.3) than for males (10.3), as females convert a high fraction of ingested food into egg production instead of growth. EE [(population biomass production)/(food ingested)] was estimated at 17.8 %.
Wolff M. and Cerda G. (1992) Feeding ecology of the crab Cancer polyodon in La Herradura Bay, northern Chile. I. Feeding chronology, food intake, and gross growth and ecological efficiency. Marine Ecology Progress Series 89: 213-219. 10.3354/meps089213
@article{Wolff1992,
Title = {Feeding ecology of the crab Cancer polyodon in La Herradura Bay, northern Chile. I. Feeding chronology, food intake, and gross growth and ecological efficiency},
Author = {Wolff, Matthias and Cerda, G},
Editor = {},
Journal = {Marine Ecology Progress Series},
Year = {1992},
Pages = {213-219},
Volume = {89},
Doi = {10.3354/meps089213},
Abstract = {Feeding activity pattern and food intake of the crab Cancer polyodon were determined from crab stomach samples taken at 3 to 4 h intervals on 2 days per season in 1988 and 1989. The gross growth efficiency (K1) and the ecological (= population production) efficiency (EE) were calculated in conjunction with growth and production data from a previous study. C. polyodon feeds at night and to a lesser extent during the day. Feeding chronology differed markedly among seasons: in winter, night feeding lasted about twice as long (13 to 15 h) as in spring, but maximum stomach fullness reached only 0.35 % BW (body weight) compared to 0.62 % BW in spring. Summer feeding resembled the spring pattern and autumn feeding the winter pattern. Daily food intake was estimated from the stomach content data and a laboratory-derived evacuation rate using the Elliott & Persson model. Daily rations increased from 2.8 (+/- 0.71) % BW in winter to 4.4 (+/- 0.64) % BW in summer and decreased to 2.7 (+/- 0.37) % BW in autumn (annual average: 3.19 % BW). K1 (weight gain as % of total food ingested) was lower for females (5.3) than for males (10.3), as females convert a high fraction of ingested food into egg production instead of growth. EE [(population biomass production)/(food ingested)] was estimated at 17.8 %.},
}
TY - JOUR
AU - Wolff, Matthias
AU - Cerda, G
TI - Feeding ecology of the crab Cancer polyodon in La Herradura Bay, northern Chile. I. Feeding chronology, food intake, and gross growth and ecological efficiency
T2 - Marine Ecology Progress Series
PY - 1992
SP - 213-219
VL - 89
DO - 10.3354/meps089213
AB - Feeding activity pattern and food intake of the crab Cancer polyodon were determined from crab stomach samples taken at 3 to 4 h intervals on 2 days per season in 1988 and 1989. The gross growth efficiency (K1) and the ecological (= population production) efficiency (EE) were calculated in conjunction with growth and production data from a previous study. C. polyodon feeds at night and to a lesser extent during the day. Feeding chronology differed markedly among seasons: in winter, night feeding lasted about twice as long (13 to 15 h) as in spring, but maximum stomach fullness reached only 0.35 % BW (body weight) compared to 0.62 % BW in spring. Summer feeding resembled the spring pattern and autumn feeding the winter pattern. Daily food intake was estimated from the stomach content data and a laboratory-derived evacuation rate using the Elliott & Persson model. Daily rations increased from 2.8 (+/- 0.71) % BW in winter to 4.4 (+/- 0.64) % BW in summer and decreased to 2.7 (+/- 0.37) % BW in autumn (annual average: 3.19 % BW). K1 (weight gain as % of total food ingested) was lower for females (5.3) than for males (10.3), as females convert a high fraction of ingested food into egg production instead of growth. EE [(population biomass production)/(food ingested)] was estimated at 17.8 %.
ER -
