Emergence rates from the benthos of the parasitic juveniles of gnathiid isopods

Grutter, Alexandra S., Lester, Robert J. G. and Greenwood, Jack (2000) Emergence rates from the benthos of the parasitic juveniles of gnathiid isopods. Marine Ecology Progress Series, 207 123-127. doi:10.3354/meps207123


Author Grutter, Alexandra S.
Lester, Robert J. G.
Greenwood, Jack
Title Emergence rates from the benthos of the parasitic juveniles of gnathiid isopods
Journal name Marine Ecology Progress Series   Check publisher's open access policy
ISSN 0171-8630
1616-1599
Publication date 2000-01-01
Sub-type Article (original research)
DOI 10.3354/meps207123
Open Access Status DOI
Volume 207
Start page 123
End page 127
Total pages 5
Place of publication Oldendorf, Germany
Publisher Inter-Research
Collection year 2000
Language eng
Abstract Variation in the rate at which parasitic gnathiid isopod juveniles emerged from the benthos at Lizard Island, Great Barrier Reef, Australia, was examined (I) every 4 or 8 h throughout the day and night over a 24 h period, (2) over a 12 h period during the day or night, and (3) during different lunar phases (weeks). The number of gnathiids sampled per 4 or 8 h was low, with only 30% of the traps containing gnathiids and the abundance ranging from 0 to 3 gnathiids m(-2). The number of gnathiids that emerged over 12 h, in contrast, ranged from 0 to 36 m(-2). During the third and fifth weeks sampled, more gnathiids emerged during the day than at night. This coincided with the full moon and new moon. Most gnathiids that emerged from the reef during the day (98 %) had not fed, in contrast to those sampled at night (71%). Of the gnathiids with no engorged gut, most (97 %) of those collected during the day were small (II. mm) compared to those collected at night (19%), the latter being mostly >1 mm. Of the gnathiids with an engorged gut, most were sampled at night (83 %) and 97 % were >1 mm in size. These percentages suggest differences in the emergence behaviour among Life stages or species of gnathiids. This study, which shows that gnathiids do emerge during the day and supports other studies showing that gnathiids also attack fishes during the day, has important implications for understanding the role of cleaner fish and their main food source, gnathiids, as it shows there is a constant source of gnathiids emerging from the reef during the day and night in search of hosts.
Keyword Ecology
Marine & Freshwater Biology
Oceanography
Crustacea
Gnathiidae
Isopoda
Ectoparasites
Great Barrier Reef
Demersal Zooplankton
Emergence Behaviour
Emergence Traps
Lunar Periodicity
Great-barrier-reef
Wrasse Labroides Dimidiatus
Cleaner Fish
Lizard-island
Heron-island
Zooplankton
Crustacea
Ectoparasites
California
Abundance
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemistry and Molecular Biosciences
Ecology Centre Publications
 
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Created: Mon, 20 Aug 2007, 01:17:33 EST