Author:
Smith Susan E.,Au David W.,Show Christina
Abstract
A demographic technique is used to compare the intrinsic rates of population
increase of 26 shark species hypothetically exposed to fishing mortality.
These rates (r2M) are used as a
measure of the relative ability of different sharks to recover from fishing
pressure. The method incorporates concepts of density dependence from standard
population modelling and uses female age at maturity, maximum reproductive
age, and average fecundity. A compensatory response to population reduction is
assumed in pre-adult survival to the extent possible given the constraints of
the life-history parameters. ‘Rebound’ productivity was strongly
affected by age at maturity and little affected by maximum age. Species with
lowest values (r2M < 0.04)
tended to be late-maturing medium- to large-sized coastal sharks, whereas
those with the highest (> 0.08) were small coastal, early-maturing species.
Sharks with mid-range values (r2M
= 0.04–0.07) were mostly large (> 250 cm maximum size) pelagic
species, relatively fast growing and early maturing. Possible selection
pressures for these three shark groups, management implications, practical
applications for the derived parameter
r2M, and recommended areas of
research are discussed.
Subject
Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics,Oceanography
Cited by
371 articles.
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