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Energy Partitioning in Semelparous and Iteroparous Triclads
A. S. Woollhead
Journal of Animal Ecology
Vol. 52, No. 2 (Jun., 1983), pp. 603-620
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/4575
Page Count: 18
You can always find the topics here!Topics: Species, Starvation, Capsules, Mortality, Food supply, Perennials, Degrowth, Mucus, Animal ecology, Fresh water
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(1) Under conditions of total starvation, B. punctata maintained capsule production and suffered greater rates of degrowth than controls; P. torva also maintained capsule production and suffered rates of degrowth that were not significantly different to controls; P. nigra ceased capsule output upon starvation. (2) The effect of partial starvation was a reduction in capsule output for all species. B. punctata preserved capsule output to a greater extent than P. torva or D. lugubris. Degrowth rates were greater for P. torva and B. punctata than for D. lugubris at normal feeding levels. As F.S.I. reduced, similar rates of degrowth were suffered by all species. (3) Mortality levels during reproduction and starvation were high for B. punctata and P. torva but low for D. lugubris. (4) Reproductive energy loss, in absolute terms, was greater for B. punctata than for P. torva or D. lugubris. Reproductive efficiency increased as F.S.I. reduced for B. punctata and D. lacteum but either remained constant or reduced for P. torva, P. tenuis and D. lugubris. (5) The hatchlings of the annual species, B. punctata and P. torva, were better able to cope with nutritive stress than the hatchlings of the perennial species, D. lugubris.
Journal of Animal Ecology © 1983 British Ecological Society