Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Spatial Distribution of Cyclograpsus cinereus Dana 1851 in Rocky Shores of Antofagasta (23º27’ S, Chile)

Version 1 : Received: 20 January 2022 / Approved: 24 January 2022 / Online: 24 January 2022 (11:48:21 CET)

How to cite: Rios-Escalante, P.D.L.; Esse, C.; Retamal, M.A.; Zuñiga, O.; Fajardo, M. Spatial Distribution of Cyclograpsus cinereus Dana 1851 in Rocky Shores of Antofagasta (23º27’ S, Chile). Preprints 2022, 2022010349 (doi: 10.20944/preprints202201.0349.v1). Rios-Escalante, P.D.L.; Esse, C.; Retamal, M.A.; Zuñiga, O.; Fajardo, M. Spatial Distribution of Cyclograpsus cinereus Dana 1851 in Rocky Shores of Antofagasta (23º27’ S, Chile). Preprints 2022, 2022010349 (doi: 10.20944/preprints202201.0349.v1).

Abstract

The decapod fauna in intertidal rocky shore in continental Chile has high species diversity mainly in northern and central Chile due high productivity of these coast due influence of cold Humboldt stream. One of the abundant species in these ecosystems is decapod Cyclograpsus cinereus Dana, 1851. The aim of the present study was determine the spatial distribution pattern of C. cinereus along rocky shore in Antofagasta bay, north of Chile between spring and summer 2018-2020. Data was obtained counting individuals from random quadrants in intertidal zones, to the obtained data was applied the variance mean ratio for determine if the specimens have random, aggregate or uniform distribution, that are associated to Poisson, negative binomial or positive binomial distributions respectively. Data obtained revealed the existence of associated distribution with respective negative binomial distribution pattern in 16 observations, and uniform distribution for 3 observations. The sites corresponds to rocky shores in urban zones, and in a protected zone, and the density does not have significant differences for both kind of sites. The observed data about aggregated pattern agree with observations for decapods for rocky shore in central and southern Chile, specifically in interpretative probabilistic models.

Keywords

Cyclograpsus cinereus; spatial distribution; intertidal; rocky shore; negative binomial distribution.

Subject

BIOLOGY, Ecology

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