Diablo Canyon power plant site ecological study Quarterly Report no. 20: April 1 - June 30, 1978
Although we continue to monitor permanent stationson a regular basis, we have suspended our 30-m2random subtidal and 1/4-m2 random intertidal studiesduring this interim year. The 1/4-m2 random subtidal study is being continued and we have added a new subtidal method of determining fish abundance.Giant red sea urchin, Strongylocentrotus franciscanus,numbers continue to decline at their last "stronghold"in our subtidal study area, permanent station15. The recruitment of juvenile blue rockfish,Sebastes mystinus, appears to be either late orlow this year in our study areas. The most abundantfish, so far, from the new method of assessment,are adult blue rockfish, kelp greenling,Hexagrammos decagrammus, and gopher rockfish,Sebastes carnatus.Various trends of abalone abundance at the permanentintertidal stations, increasing at some,decreasing at others, were observed during thisquarter.Sea otters, Enhydra lutris, seem to have reachedtheir annual springtime peak in abundance duringApril and May. Several otters were seen raftingand foraging around and near the intake covebreakwaters, apparently becoming emboldened tohuman presence. (18pp.)
| Main Authors: | , , |
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| Format: | monograph biblioteca |
| Language: | English |
| Published: |
California Department of Fish and Game, Marine Resources Region
1979
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| Subjects: | Ecology, Fisheries, Biology, |
| Online Access: | http://hdl.handle.net/1834/18000 |
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