Scientia Marina, Vol 69, No 2 (2005)

Habitat use by the pearly razorfish, Xyrichtys novacula (Pisces: Labridae)


https://doi.org/10.3989/scimar.2005.69n2223

Stelios Katsanevakis
Department of Zoology-Marine Biology, School of Biology, National and Kapodistrian University of Athens, Greece

Abstract


The population density of the pearly razorfish, Xyrichtys novacula, was estimated in eastern Mediterranean areas and was related to specific environmental variables, laying emphasis on the sediment granulometry. The density of X. novacula ranged from 0 to 20.0 individuals per 1000 m2. No correlation between X. novacula density and season, depth or the presence of common prey species was found. The X. novacula density was significantly correlated to the granulometry of the sediment, specifically to the median grain diameter Md? and the quartile deviation QD?, according to the model Density1/4 = 1.626 – 0.354Md? – 0.491QD?. The highest X. novacula densities occur in moderately or well sorted, coarse or very coarse sand. The density and distribution of X. novacula seem to largely depend on the sediment characteristics, due to the sand-diving behaviour of the species that necessitates the existence of appropriate substrate. Evidence is presented against the reported theory that during the cold season the species spends most of the time buried in the sand.

Keywords


behavioural ecology; Mediterranean; sand-diving; burying behaviour; sediment granulometry

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