Moon phase effects and timing of emerging macrobenthic assemblages in a sheltered soft-bottom sublittoral habitat

Aldo Santiago Pacheco Velasquez, Gonzalo E. Gómez, Pablo A. Santoro, Maritza Malebran, Cynthia Cortés, José M. Riascos

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Several species of benthic macro and meio-invertebrates actively emerge from the seabed to the water column during the night. Such diel vertical migrations have important consequences for benthic-pelagic coupling, dispersal, connectivity and recovery after disturbance of benthic assemblages. However, this process has never been studied in the coast of the Humboldt Current ecosystem. Herein we examined the relationship between the emerging assemblage and moon phases (and co-variables) and the timing of emergence during the day/night cycle, in a sublittoral soft-bottom habitat. Sampling using emergence traps was conducted at 7. m depth in the zone of Bolsico, a sheltered cove with low bottom hydrodynamics in northern Chile. Multivariable analysis showed that changes in the dissimilarity of the emerging assemblage were related to each moon phase. The percentage of moon illumination, bottom illumination and tide amplitude explained most of the variation of the emerging assemblage. Species showed differential responses to each moon phase; some were abundant at intermediate phases (e.g., harpacticoids), or peaked at full moon (e.g. ostracods) and others such as mysids emerged in equal abundances at all moon phases. The timing of assemblage emergence followed a consecutive sequence through the night/day period. Most of the studies dealing with the emergence processes have described species-specific responses. Our research shows that the examination at assemblage level may reveal new and distinct patterns of emergence in sublittoral soft-bottom habitats.

Original languageEnglish
Pages (from-to)34-42
Number of pages9
JournalJournal of Sea Research
Volume86
DOIs
StatePublished - Feb 2014
Externally publishedYes

Bibliographical note

Funding Information:
We thank P. Ayón and D. Araya for helping us with copepods taxonomy. E. Montanares, G. Benavides, R. Uribe and K. González are thanked for supporting field and laboratory work. Two anonymous reviewers provided helpful comments on an early version of this manuscript. This study was financed by FONDECYT N° 11110030 research fund granted to A.S. Pacheco.

Keywords

  • Active dispersal
  • Humboldt current upwelling ecosystem
  • Macrozoobenthos
  • Nocturnal behavior
  • Soft bottom

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