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Shell colour polymorphism in the chiton Ischnochiton striolatus (Gray, 1828) (Mollusca: Polyplacophora) and habitat heterogeneity Gonçalves Rodrigues, L.T.; Absalão, R.S. (2005). Shell colour polymorphism in the chiton Ischnochiton striolatus (Gray, 1828) (Mollusca: Polyplacophora) and habitat heterogeneity. Biol. J. Linn. Soc. 85(4): 543-548. https://dx.doi.org/10.1111/j.1095-8312.2005.00513.x In: Biological Journal of the Linnean Society. Academic Press: London; New York. ISSN 0024-4066; e-ISSN 1095-8312

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Beschikbaar in	Auteurs
VLIZ: Non-open access 305123 [ aanvragen ]

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Trefwoorden

ASW, Brazil, Rio de Janeiro Fauna > Aquatic organisms > Aquatic animals > Shellfish > Marine organisms > Marine molluscs Polymorphism Polymorphism Spermatophyta > Angiosperms > Monocotyledons > Cyperales > Poaceae > Crypsis Ischnochiton (Ischnochiton) striolatus (J. E. Gray, 1828) [WoRMS]; Mollusca [WoRMS]; Polyplacophora [WoRMS] Rio de Janeiro [Marine Regions] Marien/Kust

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Auteurs		Top
Gonçalves Rodrigues, L.T. Absalão, R.S.

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Abstract

Shell colour polymorphism was examined in a population of the polyplacophoran Ischnochiton striolatus (Gray, 1828) living on intertidal rocks in Búzios, Rio de Janeiro State, Brazil. Nine shell colours were identified: green (most common), grey, pink, cream, brown, orange, white, black and purple. The species habitat was also examined using three rock characteristics: volume; turnover frequency, caused by hydrodynamic disturbance; and chromatic composition. Chitons were most frequently encountered on the undersides of rocks of intermediate volume which experienced medium-intensity hydrodynamic disturbance, and which harboured a chromatically rich biotic community. These findings were in agreement with the Intermediate Disturbance Hypothesis. As chitons depend on the biotic community on rocks for food and shelter, a greater variety of colours could increase the chances of camouflage of the morphs against the background, favouring crypsis. It is likely that the frequency at which intermediate-volume rocks are overturned thus exposing the chitons on them to light would be sufficient for visual predators to act as selective agents.

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