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Seasonal Variation in Pilayella Littoralis (Phaeophyceae) and its Consequences as a Food Source for the Amphipod, Gammarus Lawrencianus, in the Intertidal of Newfoundland

Published online by Cambridge University Press:  11 May 2009

D. H. Steele  and
A. Whittick
D. H. Steele
Affiliation:
Department of Biology, Memorial University of Newfoundland, St John's, Newfoundland, A1B 3X9, Canada
A. Whittick
Affiliation:
Department of Biology, Memorial University of Newfoundland, St John's, Newfoundland, A1B 3X9, Canada
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Extract

The brown alga Pilayella littoralis is common and widely distributed in the North Atlantic. In insular Newfoundland it is found year-round in the subtidal, but shows a distinct periodicity in the intertidal where it is a summer annual. Rapid growth begins in May and a maximum biomass is achieved in the summer with plants disappearing by October. Besides seasonal changes in abundance, seasonal changes in reproductive behaviour and calorific values of this alga also occur.

Pilayella littoralis is the most abundant consumable alga available to intertidal amphipods in Newfoundland. Newly hatched Gammarus lawrencianus grew faster and matured at a younger age on a diet of summer P. littoralis than on plants collected in the spring. Size at maturity and reproductive output (size of eggs, number of eggs) of maturing females did not vary with the time of collection of Pilayella.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 71 , Issue 4 , November 1991 , pp. 883 - 889
Copyright
Copyright © Marine Biological Association of the United Kingdom 1991

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