The University of Southampton
University of Southampton Institutional Repository

Anthropogenic Harvesting Pressure and Changes in Life History: Insights from a Rocky Intertidal Limpet

Anthropogenic Harvesting Pressure and Changes in Life History: Insights from a Rocky Intertidal Limpet
Anthropogenic Harvesting Pressure and Changes in Life History: Insights from a Rocky Intertidal Limpet
The importance of large breeding individuals for maintaining the health of marine fish and invertebrate populations has long been recognized. Unfortunately, decades of human harvesting that preferentially remove larger individuals have led to drastic reductions in body sizes of many of these species. Such size-selective harvesting is particularly worrisome for sequentially hermaphroditic species where the larger size classes are composed primarily of one sex. Whether these species can maintain stable sex ratios under sustained harvesting pressure depends on the level of plasticity of their life-history traits. Here, we show that populations of a marine limpet (Lottia gigantea) can adjust a fundamental aspect of their life history (the timing of sex change) when subjected to size-selective harvesting. As predicted by theoretical models, individuals from harvested populations change sex at smaller sizes and grow at slower rates compared to individuals from protected populations. In addition, the relative size at which the change from male to female occurs remains constant (?0.75; size at sex change/maximum size) across populations, regardless of harvesting pressure. Our results show that population-level demographic and life-history data, in conjunction with existing theory, can be sufficient to predict the responses of sequential hermaphrodites to harvesting pressure. Furthermore, they suggest such species can potentially adapt to size-selective harvesting.
life-history invariance, Lottia gigantea, size-selective harvesting, relative size at sex change, phenotypic plasticity, protandry
0003-0147
200-210
Fenberg, Phillip B.
c73918cd-98cc-41e6-a18c-bf0de4f1ace8
Roy, Kaustuv
a1a9a581-0508-4340-9065-a1cbc5a9a04e
Fenberg, Phillip B.
c73918cd-98cc-41e6-a18c-bf0de4f1ace8
Roy, Kaustuv
a1a9a581-0508-4340-9065-a1cbc5a9a04e

Fenberg, Phillip B. and Roy, Kaustuv (2012) Anthropogenic Harvesting Pressure and Changes in Life History: Insights from a Rocky Intertidal Limpet. The American Naturalist, 180 (2), 200-210. (doi:10.1086/666613).

Record type: Article

Abstract

The importance of large breeding individuals for maintaining the health of marine fish and invertebrate populations has long been recognized. Unfortunately, decades of human harvesting that preferentially remove larger individuals have led to drastic reductions in body sizes of many of these species. Such size-selective harvesting is particularly worrisome for sequentially hermaphroditic species where the larger size classes are composed primarily of one sex. Whether these species can maintain stable sex ratios under sustained harvesting pressure depends on the level of plasticity of their life-history traits. Here, we show that populations of a marine limpet (Lottia gigantea) can adjust a fundamental aspect of their life history (the timing of sex change) when subjected to size-selective harvesting. As predicted by theoretical models, individuals from harvested populations change sex at smaller sizes and grow at slower rates compared to individuals from protected populations. In addition, the relative size at which the change from male to female occurs remains constant (?0.75; size at sex change/maximum size) across populations, regardless of harvesting pressure. Our results show that population-level demographic and life-history data, in conjunction with existing theory, can be sufficient to predict the responses of sequential hermaphrodites to harvesting pressure. Furthermore, they suggest such species can potentially adapt to size-selective harvesting.

Text
Fenberg&Roy_2012.pdf - Version of Record
Download (355kB)

More information

Published date: August 2012
Keywords: life-history invariance, Lottia gigantea, size-selective harvesting, relative size at sex change, phenotypic plasticity, protandry
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 358572
URI: http://eprints.soton.ac.uk/id/eprint/358572
ISSN: 0003-0147
PURE UUID: d1117790-4bf1-489c-bdc2-44ed81846e96

Catalogue record

Date deposited: 08 Oct 2013 15:13
Last modified: 07 Jan 2022 21:32

Export record

Altmetrics

Contributors

Author: Kaustuv Roy

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×