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

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

doi:10.1590/1519-6984.246889

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Brazilian Journal of Biology

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Original Article • Braz. J. Biol. 83 • 2023 • https://doi.org/10.1590/1519-6984.246889 copy

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

Distribuição espacial de Echinolitorina peruviana (Lamarck, 1882) para costa rochosa entremarés em Antofagasta (23 ° S, Chile)

Authorship SCIMAGO INSTITUTIONS RANKINGS

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.

Keywords:
Echinolittorina peruviana; rocky shore; intertidal environment; spectral properties; negative binomial distribution

Site	El Lenguado 4	El Lenguado 3	El Lenguado 2	El Lenguado 1	Coloso	Las Garumas	Barrio Historico	El Carboncillo	Trocadero 2	Trocadero 1
Geographical location	23°46’25.2’’S 70°28’38.9’’ W	23°46’25.5’’S 70°28’31.4’’W	23°46’21.7’’S 70°28’26.1’’W	23°46’09.5’’S 70°28’22.2’’W	23°45’35.6’’S 70°27’41.9’’W	23°43’38.2’’S 70°26’16.5’’W	23°38’31.4’’S 70°23’49.5’’W	23°38’20.7’’S 70°23’57.2’’W	23°34’57.2’’S 70°23’40.5’’W	23°34’48.4’’S 70°23’36.4’’W
Abundances	7.475	7.975	10.800	2.550	5.375	0.000	3.075	2.725	11.050	2.525
Variance	2.77	24.98	31.20	31.95	40.96	0.000	2.61	3.97	3.74	18.56
Variance /Mean ratio	1.08	2.31	3.91	4.27	7.62	No data	0.96	1.29	1.48	1.68
B1	0.155	0.155	0.155	0.155	0.147	0.154	0.159	0.143	0.189	0.143
B2	0.137	0.137	0.137	0.137	0.125	0.130	0.138	0.121	0.170	0.119
B3	0.123	0.123	0.123	0.123	0.092	0.108	0.118	0.092	0.154	0.081
B4	0.124	0.124	0.124	0.124	0.067	0.080	0.079	0.064	0.123	0.062
B5	0.147	0.147	0.147	0.147	0.047	0.047	0.052	0.038	0.111	0.041
B6	0.162	0.162	0.162	0.162	0.026	0.023	0.035	0.023	0.052	0.022
B7	0.127	0.127	0.127	0.127	0.017	0.022	0.023	0.016	0.033	0.014

	B1	B2	B3	B4	B5	B6	B7
Abundance	0.5734	0.6479	0.6461	0.6764	0.6454	0.4966	0.4636
Abundance	P = 0.0830	P = 0.0427	P = 0.0435	P = 0.0317	P = 0.0438	P = 0.1442	P = 0.1771
B1		0.9872	0.8957	0.5607	0.3583	0.0899	0.0588
B1		P < 0.0001	P = 0.0004	P = 0.0917	P = 0.3093	P = 0.8048	P = 0.8716
B2			0.9470	0.6733	0.4918	0.2373	0.2051
B2			P < 0.0001	P = 0.0328	P = 0.1487	P = 0.5090	P = 0.5696
B3				0.8379	0.6877	0.4863	0.4627
B3				P = 0.0024	P = 0.0279	P = 0.1540	P = 0.1780
B4					0.9694	0.8702	0.8570
B4					P < 0.0001	P = 0.0010	P = 0.0015
B5						0.9582	0.9475
B5						P < 0.0001	P < 0.0001
B6							0.9985
B6							P = 0.0021

Eigenvalue	Variance percent	Cumulative variance	Percentage
Abun	14.0000	99.0000	99.9420
B1	0.0077	0.0534	99.9954
B2	0.0006	0.0044	99.9998
B3	< 0.0001	0.0001	100.0000
B4	< 0.0001	< 0.0001	100.0000
B5	< 0.0001	< 0.0001	100.0000
B6	< 0.0001	< 0.0001	100.0000
B7	< 0.0001	< 0.0001	100.0000

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