Spatial distribution of Echinolitorina peruviana (Lamarck, 1882) for intertidal rocky shore in Antofagasta (23° S, Chile).

P De Los Ríos-Escalante,P Adikesavan,C Stella,O Zúñiga,C Esse

doi:10.1590/1519-6984.246889

Abstract

The intertidal rocky shores in continental Chile have high species diversity mainly in northern Chile (18-27° S), and one of the most widespread species is the gastropod Echinolittorina peruviana (Lamarck, 1822). The aim of the present study is do a first characterization of spatial distribution of E. peruviana in along rocky shore in Antofagasta town in northern Chile. Individuals were counted in nine different sites that also were determined their spectral properties using remote sensing techniques (LANDSAT ETM+). The results revealed that sites without marked human intervention have more abundant in comparison to sites located in the town, also in all studied sites was found an aggregated pattern, and in six of these sites were found a negative binomial distribution. The low density related to sites with human intervention is supported when spectral properties for sites were included. These results would agree with other similar results for rocky shore in northern and southern Chile.

Highlights

The rocky intertidal environments in Chilean coast is characterized by the high species diversity, including molluscs, that has a marked geographic distribution pattern (Santelices, 1992; Broitman et al, 2001; Lee et al, 2008)
The obtained results revealed that the sites without human intervention have marked high abundances in comparison to sites located in the town, and the results of spatial distribution, revealed the presence of aggregated pattern for eight sites, and one site with uniform distribution (Barrio Histórico) (Table 1)
The results revealed that seven sites has negative binomial distribution, and only two sites (Caleta Coloso and El Lenguado 1) have not negative binomial distribution (Figure 2)

Summary

Introduction

The rocky intertidal environments in Chilean coast is characterized by the high species diversity, including molluscs, that has a marked geographic distribution pattern (Santelices, 1992; Broitman et al, 2001; Lee et al, 2008). The rocky shore is markedly exposed to waves among a wide latitudinal gradient in Chile (17-41°S), whereas in extreme southern Chile the coast is characterized by the presence of islands and inner seas with different patterns in species reported (Santelices, 1992; Camus et al, 2013; Velásquez et al, 2016). Considering these antecedents, there are interspecific competence between intertidal gastropods and monoplacophora due shelter availabilities (Aguilera and Navarrete, 2011; 2012), that can generate that some species can have diurnal or nocturnal activity (Aguilera and Navarrete, 2011)

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