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Spatial distribution and coexistence of monogenean gill parasites inhabiting two damselfishes from Moorea island in French Polynesia

Published online by Cambridge University Press:  12 April 2024

C. M. Lo  and
S. Morand
C. M. Lo*
Affiliation:
Ecole Pratique des Hautes Etudes (URA-CNRS 1453)
S. Morand*
Affiliation:
Centre de Biologie et d'Ecologie Tropicale et Méditerranéenne (UMR-CNRS 5555), Université de Perpignan Av. de Villeneuve, 66860 Perpignan Cedex, France
*
†Present address: Centre de Recherches Insulaires et Observatoires de l'Environnement (CRIOBE), BP 1013, Papetoai Moorea, French Polynesia
*Author for correspondence Fax: (33) 68 66 22 81 E-mail: morand@univ-perp.fr
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Abstract

The ectoparasite fauna of two damselfishes, Stegastes nigricans and Dascyllus aruanus, from Moorea Island in French Polynesia was investigated. Gills of these damselfishes were infected with congeneric Monopisthocotylea Monogenea belonging to the genus Haliotrema. Stegastes nigricans were found to harbour a guild of three Haliotrema species whereas only one species inhabited D. aruanus. Microhabitat distribution, inter- and intraspecific competition and interspecific associations on the gill were studied. Observations on site preference revealed no spatial segregation between the three congeneric species inhabiting the gills of S. nigricans. Juvenile and adult monogeneans of that guild occurred on the same microhabitat. The dominant species Haliotrema sp. 1 did not expand on the microhabitat when the intensity of infection increased. Interspecific association tests revealed positive and negative associations. Haliotrema sp. 4 expanded its distribution on the gills of Dascyllus aruanus when the intensity of infection increased suggesting the likelihood of intraspecific competition. Juvenile and adult monogeneans of Haliotrema sp. 4 appeared to segregate as a result of intraspecific competition. This competition may exist to enhance resource availability when the gill habitat is limited. Overlaps between niche breadth and species microhabitat were revealed for monogenean species inhabiting S. nigricans. Interspecific competition did not appear to play an important role in the distribution of S. nigricans congeneric ectoparasites. Reinforcement of reproductive barriers may have led to the avoidance of hybridization.

Type
Research Article
Information
Journal of Helminthology , Volume 74 , Issue 4 , December 2000 , pp. 329 - 336
Copyright
Copyright © Cambridge University Press 2000

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