Free Content An Experimental Evaluation of Habitat Enhancement on Homogeneous Marine Bottoms in Southern Chile

 Download
(PDF 609.1 kb)
 
Download Article:

Abstract:

An experimental evaluation of habitat modification on species richness and abundance by enhancing spatial heterogeneity using artificial reefs was carried out in Seno Reloncaví, southern Chile (41°29′S, 72°54′W). Because of the potential applications of artificial reefs for fisheries, particular attention was paid to commercially valuable species. In October 1990, hollow (30 cm)3 concrete blocks with 20 cm diameter openings on their six sides were arranged in two layers to form 0.6 m high reefs of 0.81 m2 basal area. Five of these reefs were deployed at depths of 13 to 18 m on sandy and rubble bottoms. Colonization and community development was quantitatively recorded using SCUBA. Three major faunal groups—fish, crustaceans, and sea urchins—increased their abundance on the reefs. Commercially valuable species included adults of two crabs: Cancer edwardsi and Homalaspis plana. The reefs also served as recruiting sites for juvenile rockfish (Sebastes capensis) and as feeding and courtship arenas for tripterygids (Tripterygion cunninghami). A few other crab and fish species also appeared in and around the reefs but without becoming residents. Algal colonization was slow and their abundance was notably controlled by sea urchins (Arbacia dufresnei). Artificial habitats placed on low-relief bottoms of the Channel Region of Southern Chile can potentially enhance the abundance of some commercially valuable species. The effect of artificial reefs on species richness (especially fish) was not striking, however. This is most likely related to a natural paucity of species in the region.

Document Type: Research Article

Publication date: September 1, 1994

More about this publication?
  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • ingentaconnect is not responsible for the content or availability of external websites
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more