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  • 1
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    California Department of Fish and Game, Marine Resources Region | Avila Beach, CA
    In:  http://aquaticcommons.org/id/eprint/21 | 8 | 2011-09-29 22:41:38 | 21 | California Department of Fish and Game
    Publication Date: 2021-06-25
    Description: Rough seas and the hiring freeze further delayed completionof our field and laboratory work.All random 1/4-m2 stations were completed in Diablo Covebut ten stations remain in the North Control. Ninerandom fish species counts were conducted in Diablo Cove.Very few sea otters, Enhydra lutris, were observed duringthis quarter, none in Diablo Cove. (10pp.)
    Keywords: Ecology ; Biology
    Repository Name: AquaDocs
    Type: monograph
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  • 2
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    California Department of Fish and Game, Marine Resources Region | Avila Beach, CA
    In:  http://aquaticcommons.org/id/eprint/23 | 8 | 2011-09-29 22:42:01 | 23 | California Department of Fish and Game
    Publication Date: 2021-06-25
    Description: 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.)
    Keywords: Ecology ; Fisheries ; Biology
    Repository Name: AquaDocs
    Type: monograph
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  • 3
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    California Department of Fish and Game, Marine Resources Region | Avila Beach, CA
    In:  http://aquaticcommons.org/id/eprint/26 | 8 | 2011-09-29 22:42:06 | 26 | California Department of Fish and Game
    Publication Date: 2021-06-25
    Description: Field work for this quarter consisted of completion of random 1/4-m2 subtidal stations from the summer sampling season. In addition, one permanent subtidal station was surveyed. No intertidal stations were surveyed. Sea otters, Enhydra lutris, remained scarce in the vicinity of the power plant.Lab work was comprised of processing subtidal algaesamples and sorting and identifying invertebrates fromintertidal samples. Analysis of preoperational datafor final report proceeded apace. (7pp.)
    Keywords: Ecology ; Biology ; Power plants ; sea otters ; algae ; invertebrates
    Repository Name: AquaDocs
    Type: monograph
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  • 4
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    California Department of Fish and Game, Marine Resources Region | Avila Beach, CA
    In:  http://aquaticcommons.org/id/eprint/51 | 8 | 2011-09-29 22:39:16 | 51 | California Department of Fish and Game
    Publication Date: 2021-06-25
    Description: Field work was limited to monitoring permanentintertidal and subtidal stations. Only a fewstations were surveyed due to a long series ofwinter storms which produced large seas.Office and laboratory work was devoted to completing computer data sheets for keypunching, completing the 1976/77 annual report and several quarterly reports, and processing the remaining algae samples collected at subtidal and intertidal stations in 1977.Sea otter activity increased in South Cove andDiablo Cove where sea otters were observed onfive out of 20 observation days. (11pp.)
    Keywords: Ecology ; Biology
    Repository Name: AquaDocs
    Type: monograph
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  • 5
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    California Department of Fish and Game, Marine Resources Region | Avila Beach, CA
    In:  http://aquaticcommons.org/id/eprint/57 | 8 | 2011-09-29 22:38:41 | 57 | California Department of Fish and Game
    Publication Date: 2021-06-25
    Description: More stations were surveyed during this report periodthan during any previous period. A total of 818 mandayswas spent surveying 18 permanent and 67 randomsubtidal stations, 19 permanent and 50 random intertidalstations, and 64 sportfish catch-per-unit-of-effortstations, as well as conducting corollary laboratorywork.In the subtidal areas, Laminaria dentigera and Pterygophoracalifornica, both important subsurface kelpspecies, increased in their combined total numbers fromthe 1976 survey. However, Nereocystis luetkeana, thebull kelp, declined substantially in all study areas.Population trends of many of the dominant subtidalmacro-invertebrates have varied depending on the speciesand on the type of method utilized. Regression analyseshave been performed on selected species for numbersversus depth. Red algal abundance and diversity appearto have increased in both subtidal study areas.Of the three observation areas, sea otters were observedleast frequently in Diablo Cove. However, there continuesto be fresh evidence of otter foraging withinDiablo Cove.Several seasons' data for intertidal algae and invertebrates have been summarized for one study area. While the algae biomass shows a fairly clear seasonality ofabundance, the trends in numbers of the six invertebratespecies considered are not as well defined.Because of high variability in the data, the sportfishcatch-per-unit-of-effort and hook-and-line study wascancelled in December.Populations of intertidal red and black abalones,Haliotis rufescens and H. cracherodii, respectively,appear to have remained fairly stable during the1976-77 period.Two other ancillary studies were also terminated duringthis period: interviews of commercial abalone andurchin fishermen, and observations of foam in Diablo Cove. (107pp.)
    Keywords: Ecology ; Fisheries ; Biology
    Repository Name: AquaDocs
    Type: monograph
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  • 6
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    California Department of Fish and Game, Marine Resources Region | Avila Beach, CA
    In:  http://aquaticcommons.org/id/eprint/74 | 8 | 2011-09-29 22:37:46 | 74 | California Department of Fish and Game
    Publication Date: 2021-06-25
    Description: Large storm-generated swells prevented us fromcompleting the random stations in the North Control.The project has shifted to a low level of field work to allow for analysis of all data and preparation of the final report. Field work during the next year will be confined to monitoring permanent stations.Four permanent subtidal stations were surveyed during the quarter, including a new station located at the entrance of Diablo Cove. Nine random 30m2 stations and 32 - 1/4m2 quadrats were also completed. It appears, from this year's subtidal studies, that there has been a decline in theabundance of lingcod, Ophiodon elongatus, and kelp greenling, Hexagrammos decagrammus, in the Diablo Canyon area since our studies began in 1974.A few sea otters continue to raft and forage inLion Rock Cove. (12pp.)
    Keywords: Ecology ; Biology ; Diablo Canyon Power Plant ; California ; environmental impact
    Repository Name: AquaDocs
    Type: monograph
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  • 7
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    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/1439 | 8 | 2011-09-29 20:37:31 | 1439 | California Department of Fish and Game
    Publication Date: 2021-07-08
    Description: (Document pdf contains 16 pages)
    Keywords: Management ; Fisheries ; Biology
    Repository Name: AquaDocs
    Type: monograph
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  • 8
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    California Department of Fish and Game | Long Beach, CA
    In:  http://aquaticcommons.org/id/eprint/775 | 8 | 2011-09-29 21:37:36 | 775 | California Department of Fish and Game
    Publication Date: 2021-07-02
    Description: Biologists of the California Department of Fish and Game, under contract with the Pacific Gas and Electric Company, conducted surveys or intertidal and subtidal plants and animals 1n the vicinity of the Diablo Canyon Nuclear PowerPlant for the summer of 1973 through 1978. Abundances of the dominant plants and animals were obtained at random as well as permanent stations in Diablo Cove as well as nearby control areas. A total of 643 permanent and random stations were surveyed, 262 in the intertidal and 381 in the subtidal.Natural as well as man-caused occurrences have resulted in several significant changes in plant and animal abundance in the study areas; these include the arrival of the southern front or the sea otter population in Diablo Cove in 1974; a strong red tide bloom in the fall of 1974; and the release of copper ions from the power plant condenser tubes into Diablo Cove during the summer of 1974.Our intertidal and subtidal random station data have shown a strong decline in giant red sea urchin, Strongylocentrotus franciscanus, densities and the surface canopy kelp, Nereocystis/leutkeana, and a corresponding increase in thesubcanopy kelps, Pterygophora and Laminaria. Seasonal patterns of abundance of foliose red algae at random intertidal stations occurred at all study areas. Several species intertidal and subtidal invertebrates showed increasing or decreasing trends in levels of abundance during the five year study period covered by the report. Some of these changes in abundance may be related tothe natural man-caused impacts mentioned above. (Document has 728 pages)
    Keywords: Ecology ; Biology ; Diablo Canyon power plant ; California ; intertidal survey ; subtidal survey ; giant red sea urchin ; Strongylocentrotus franciscanus ; Nereocystis leutkeana
    Repository Name: AquaDocs
    Type: monograph
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  • 9
    Publication Date: 2007-05-01
    Print ISSN: 1001-0602
    Electronic ISSN: 1748-7838
    Topics: Biology , Medicine
    Published by Springer Nature
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  • 10
    Publication Date: 2008-03-01
    Print ISSN: 1674-2052
    Electronic ISSN: 1752-9867
    Topics: Biology
    Published by Cell Press
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