Vertical distribution of rocky subtidal assemblages along the exposed coast of north-central Chile

• Published in: Journal of sea research Vol. 107; pp. 34 - 47
• Main Authors: Stotz, Wolfgang B., Aburto, Jaime, Caillaux, Luis M., González, Sergio A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2016
• Subjects: Chile; Coastal environments; Coastlines; Communities; Community monitoring; Echinoidea; Environmental monitoring; Feeding; Grounds; Lessonia trabeculata; Marine; Psittacus; Pyura chilensis; Sea urchins; Shores; Southeastern Pacific; Subtidal; Tetrapygus niger; Zonation pattern; ISE, Chile; Community monitoring; Subtidal; Zonation pattern; Chile; Southeastern Pacific
• ISSN: 1385-1101; 1873-1414
• DOI: 10.1016/j.seares.2015.11.006

Through a systematic study of a stretch of coast in north central Chile, the variety and vertical zonation patterns of the rocky subtidal communities are described, thereby revising apparent uniformity and lack of vertical zonation of the rocky subtidal of southeastern Pacific shores previously reported in the literature. Over the 600km of coast studied, the following pattern of depth-zonation is described: an upper fringe (lower part of the sublittoral fringe) characterized by barren grounds dominated by calcareous encrusting algae and the sea urchin Tetrapygus niger; an intermediate fringe (upper Infralittoral sub-zone) characterized either by deep barren grounds similar to the former, or kelp beds of Lessonia trabeculata, or an assemblage of suspension feeding organisms, as the big barnacle Austromegabalanus psittacus and/or the tunicate Pyura chilensis; and a deep fringe (Circalittoral sub-zone) dominated by small encrusting or mobile invertebrates. This basic vertical zonation pattern of the shallow rocky subtidal communities seems to be common to most of the temperate coasts of the world. The analysis, first of the occurrence of the general zonation pattern and second of the species composition within the assemblages corresponding to each sub-zone, offers a useful framework for the assessment of the eventual impacts and changes within the shallow rocky subtidal habitat, for example within environmental monitoring programs. •600km of sampled Chilean coast shows a common zonation pattern of subtidal species assemblages.•A review of subtidal communities around the world shows a recurrent zonation pattern.•Equivalence to the universal intertidal zonation pattern proposed 60years ago is suggested.•Subtidal zonation pattern facilitates environmental impact assessments in data poor situations.