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On some ecological aspects of the lugworm Abarenicola affinis chiliensis Wells, 1963 (Polychaeta: Scolecida: Arenicolidae) from shallow soft bottoms of northern Chile

On some ecological aspects of the lugworm Abarenicola affinis chiliensis Wells, 1963 (Polychaeta: Scolecida: Arenicolidae) from shallow soft bottoms of northern Chile
On some ecological aspects of the lugworm Abarenicola affinis chiliensis Wells, 1963 (Polychaeta: Scolecida: Arenicolidae) from shallow soft bottoms of northern Chile
We conducted an ecological study of a population of the polychaete Abarenicola affinis chiliensis in the shallow subtidal zone of Caleta Guardiamarina Riquelme in northern Chile. The study area is characterized by a hypoxic bottom consisting of fine sands and a silt-clay mixture, with high values of total organic matter content (TOM > 20%). During the two study periods (spring 1996 and 1997), the numerical contribution of A. affinis chiliensis to the total macrofauna was greater than 80%. A similar pattern was recorded for biomass, with A. affinis chiliensis surpassing 95% of the total macrofauna biomass. Statistical analyses did not detect significant differences in environmental and biotic variables between years (with the exception of salinity, which increased slightly),
indicating temporal stability of these variables over the study period. Our results do not support the hypothesis of Wells that seawater temperatures act as a physical barrier impeding the dispersal of Abarenicola species. This hypothesis should be reexamined for some representatives of Abarenicola on the Pacific coast of South America.
1438-387X
1-7
Moreno, Rodrigo A.
36b35aa6-fb07-445d-ab7f-e2ca4e2f5f9c
Rozbaczylo, Nicolas
fc1c8fbb-352d-4c7c-856f-4f0039a3afde
Sepulveda, Roger D.
a154a110-21ff-4723-b4ca-2daf30befd31
Marinkovic, Milko I.
e29be358-7d3c-43ea-b266-8f421baf81cb
Arntz, Wolf E.
b6a07f61-65ed-46d8-ab00-4dde6df82724
Thatje, Sven
f1011fe3-1048-40c0-97c1-e93b796e6533
Moreno, Rodrigo A.
36b35aa6-fb07-445d-ab7f-e2ca4e2f5f9c
Rozbaczylo, Nicolas
fc1c8fbb-352d-4c7c-856f-4f0039a3afde
Sepulveda, Roger D.
a154a110-21ff-4723-b4ca-2daf30befd31
Marinkovic, Milko I.
e29be358-7d3c-43ea-b266-8f421baf81cb
Arntz, Wolf E.
b6a07f61-65ed-46d8-ab00-4dde6df82724
Thatje, Sven
f1011fe3-1048-40c0-97c1-e93b796e6533

Moreno, Rodrigo A., Rozbaczylo, Nicolas, Sepulveda, Roger D., Marinkovic, Milko I., Arntz, Wolf E. and Thatje, Sven (2007) On some ecological aspects of the lugworm Abarenicola affinis chiliensis Wells, 1963 (Polychaeta: Scolecida: Arenicolidae) from shallow soft bottoms of northern Chile. Helgoland Marine Research, 61 (1), 1-7. (doi:10.1007/s10152-006-0047-2).

Record type: Article

Abstract

We conducted an ecological study of a population of the polychaete Abarenicola affinis chiliensis in the shallow subtidal zone of Caleta Guardiamarina Riquelme in northern Chile. The study area is characterized by a hypoxic bottom consisting of fine sands and a silt-clay mixture, with high values of total organic matter content (TOM > 20%). During the two study periods (spring 1996 and 1997), the numerical contribution of A. affinis chiliensis to the total macrofauna was greater than 80%. A similar pattern was recorded for biomass, with A. affinis chiliensis surpassing 95% of the total macrofauna biomass. Statistical analyses did not detect significant differences in environmental and biotic variables between years (with the exception of salinity, which increased slightly),
indicating temporal stability of these variables over the study period. Our results do not support the hypothesis of Wells that seawater temperatures act as a physical barrier impeding the dispersal of Abarenicola species. This hypothesis should be reexamined for some representatives of Abarenicola on the Pacific coast of South America.

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Published date: 2007

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Local EPrints ID: 44188
URI: http://eprints.soton.ac.uk/id/eprint/44188
ISSN: 1438-387X
PURE UUID: 88c37e9d-42ff-4429-95d0-026e0f891009

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Date deposited: 19 Feb 2007
Last modified: 15 Mar 2024 09:01

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Contributors

Author: Rodrigo A. Moreno
Author: Nicolas Rozbaczylo
Author: Roger D. Sepulveda
Author: Milko I. Marinkovic
Author: Wolf E. Arntz
Author: Sven Thatje

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