Evidence for Bottom-Up Control of Upper-Trophic-Level Marine Populations


in Whales, Whaling, and Ocean Ecosystems

Published by University of California Press

Published in print January 2007 | ISBN: 9780520248847
Published online March 2012 | e-ISBN: 9780520933200 | DOI:
Evidence for Bottom-Up Control of Upper-Trophic-Level Marine Populations

Show Summary Details


This chapter examines the evidence for a bottom-up limitation of upper-trophic-level fish, marine birds, and marine mammals. It presents evidence of the role of food limitation on population size and on individual body condition and growth, both of which can affect fecundity in fish. In marine birds and mammals, body condition similarly affects fecundity and the potential for survival to age of first breeding, as well as adult survival. The discussion then examines briefly aspects of the life history characteristics that would argue for a weak role of predation in the regulation of populations of upper-trophic-level species in the marine environment, the spatial scales at which one might expect top-down or bottom-up control to play a more decisive role, and how the relative mobility of predator and prey affect the likelihood of top-down control.

Keywords: upper-trophic-level fish; marine mammals; food limitation; fecundity; life history characteristics; predation

Chapter.  14185 words. 

Subjects: Aquatic Biology

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.