Library Open Repository

Impact of micropredatory gnathiid isopods on young coral reef fishes

Downloads

Downloads per month over past year

Grutter, AS and Pickering, JL and McCallum, HI and McCormick, MI (2008) Impact of micropredatory gnathiid isopods on young coral reef fishes. Coral Reefs, 27 (3). pp. 655-661. ISSN 0722-4028

[img] PDF
McCallum,_Impact_of_micropredatory...pdf | Request a copy
Full text restricted

Abstract

The ecological role of parasites in the early life-history stages of coral reef fish, and whether this varies between fish with and without a pelagic phase, was investigated. The susceptibility to, and effect of reef-based micropredatory gnathiid isopods on larval, recently settled, and juvenile fishes was tested using two damselfishes (Pomacentridae): Neopomacentrus azysron, which has pelagic larvae, and Acanthochromis polyacanthus, which does not. When larval and recently settled stages of N. azysron and very young A. polyacanthus juveniles (smaller than larval N. azysron) were exposed to one or three gnathiids, the proportion of infections did not vary significantly among the three host types or between the number of gnathiids to which the fish were exposed. The overall infection was 35%. Mortality, however, differed among the three gnathiid-exposed host types with most deaths occurring in larval N. azysron; no mortalities occurred for recently settled N. azysron exposed to one or three gnathiids, and A. polyacanthus exposed to one gnathiid. Mortality did not differ significantly between larval N. azysron and A. polyacanthus juveniles, failing to provide support for the hypothesis that reef-based A. polyacanthus juveniles are better adapted to gnathiid attack than fish with a pelagic phase. The study suggests that settling on the reef exposes young fish to potentially deadly micropredators. This supports the idea that the pelagic phase may allow young fish to avoid reef-based parasites.

Item Type: Article
Keywords: Coral reef fish larvae - Dispersal - Gnathiidae - Migration - Survival
Journal or Publication Title: Coral Reefs
Page Range: pp. 655-661
ISSN: 0722-4028
Identification Number - DOI: 10.1007/s00338-008-0377-4
Additional Information: The original publication is available at www.springerlink.com
Date Deposited: 30 Sep 2008 23:46
Last Modified: 18 Nov 2014 03:50
URI: http://eprints.utas.edu.au/id/eprint/7683
Item Statistics: View statistics for this item

Repository Staff Only (login required)

Item Control Page Item Control Page