Journal
MARINE ECOLOGY PROGRESS SERIES
Volume 375, Issue -, Pages 209-218Publisher
INTER-RESEARCH
DOI: 10.3354/meps07890
Keywords
Trophic cascade; Fishing; Predation; Population structure; Eucidaris galapagensis; Galapagos Marine Reserve; Ecuador
Categories
Funding
- Charles Darwin Research Station (CDRS)
- Galapagos National Park Service (GNPS)
- GNPS
- World Bank
- OEA/LASPAU
- AMELIS CONACYT [J37689-V]
- Inter-American Development Bank
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This article replaces Sonenholzner et al. (2007; Mar Ecol Prog Ser 343:77-85), which was retracted on September 19, 2007, due to errors in entry of data on sea urchins. We sampled 10 highly fished and 10 (putatively) lightly fished shallow rocky reefs in the southeastern area of the Galapagos Marine Reserve, Ecuador. After the correction, these are the new results: there was a negative association between slate-pencil urchins Eucidaris galapagensis and non-coralline algae. In addition, pencil urchins were less abundant where there were many predators. An indirect positive association between predators and non-coralline algae occurred. Fishing appeared to affect this trophic cascade. The spiny. lobster Panulirus penicillatus, the slipper lobster Scyllarides astori, and the Mexican hogfish Bodianus diplotaenia were significantly less abundant at highly fished sites. Urchin density was higher at highly fished sites. Non-coralline algae were nearly absent from highly fished sites, where a continuous carpet of the anemone Aiptasia sp. was recorded, and the algal assemblage was mainly structured by encrusting coralline and articulated calcareous algae.
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