Food habits as an ecological partitioning mechanism in the nearshore rockfishes (Sebastes) of Carmel Bay, California

Roberts, Dale Alan (1979) Food habits as an ecological partitioning mechanism in the nearshore rockfishes (Sebastes) of Carmel Bay, California. Masters Thesis, San Francisco State University, 74pp.

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Abstract

In the kelp forests of Carmel Bay there are six common rockfishes (Sebastes). Three are pelagic (S. serranoides, S. mystinus, and S. melanops) and two are demersal (S. chrysomelas and S. carnatus). The sixth (S. atrovirens) is generally found a few meters above the sea floor. The pelagic rockfishes which are spatially overlapping have different feeding habits. All rockfishes except S. mystinus utilize juvenile rockfishes as their primary food source during the upwelling season. Throughout the non-upwelling season, most species consume invertebrate prey. The pelagic rockfishes have shorter maxillary bones and longer gill rakers than their demersal congeners, both specializations for taking smaller prey. They also have longer intestines, enabling them to utilize less digestable foods. S. mystinus, which has the longest intestine, may be able to use algae as a food source. Fat reserves are accumulated from July through October, when prey is most abundant. Fat is depleted throughout the rest of the year as food becomes scarce and development of sexual organs takes place. Gonad development occurs from November through February for all species except S. atrovirens.

Item Type: Thesis
Title: Food habits as an ecological partitioning mechanism in the nearshore rockfishes (Sebastes) of Carmel Bay, California
Personal Creator/Author:
CreatorsEmail
Roberts, Dale Alan
Number of Pages: 74
Date: 1979
Latitude: 36.54
Longitude: -121.94
Institution: San Francisco State University
Contact Email Address: Dale_Roberts@nps.gov
Issuing Agency: San Francisco State University
Uncontrolled Keywords: Rockfishes; Sebastes; Carmel Bay; California
Subjects: Ecology
Fisheries
Biology
Item ID: 1804
Depositing User: Kit Johnston
Date Deposited: 11 Jan 2009 19:56
Last Modified: 29 Sep 2011 20:01
URI: http://aquaticcommons.org/id/eprint/1804

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