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  • Fisheries  (5)
  • Chemical Engineering
  • GENERAL
  • Inorganic Chemistry
  • SPACECRAFT PROPULSION AND POWER
  • Avila Beach, CA  (5)
  • 2020-2022  (5)
  • 1990-1994
  • 1955-1959
  • 1
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    Diablo Canyon power plant site ecological study report; January 1, 1979 - June 30, 1980 (2021)
    California Department of Fish and Game, Marine Resources Region | Avila Beach, CA
    In:  http://aquaticcommons.org/id/eprint/228 | 8 | 2011-09-29 22:28:04 | 228 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-27
    Description: Full-scale field studies at the Diablo Canyon Nuclear Power Plant Site were resumed in early 1979 after a year of reduced effort to provide time for preparation of a final report of pre-operational studies. Since the power plant had not begun operation during this period (January 1,1979 - June 30, 1980), these data will be added to our pre-operational data base.Personnel time was spent at the site conducting intertidaland subtidal surveys, otter counts, conducting a shore survey of the Nereocystis in Diablo Cove, processing algae samples in the laboratory, and compiling the analyzed data.At permanent and random intertidal stations, red abalone numbers remained at very low levels; black abalone densities were higher than previous surveys at some stations.At subtidal stations, giant red sea urchin densities remained at low levels and, conversely, Laminaria and Pterygophora remained at a high level of abundance.Sea otters continued to forage in the study areas, with the highest observed numbers of otters occurring in the spring and summer, and the lowest numbers occurring in the fall and winter. (91pp.)
    Keywords: Ecology ; Fisheries ; Biology
    Repository Name: AquaDocs
    Type: monograph
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  • 2
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    Diablo Canyon power plant site ecological study Quarterly Report no. 20: April 1 - June 30, 1978 (2021)
    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
    Details
    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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    Diablo Canyon power plant site ecological study Quarterly Report no. 17: July 1 - September 30, 1977 (2021)
    California Department of Fish and Game, Marine Resources Region | Avila Beach, CA
    In:  http://aquaticcommons.org/id/eprint/46 | 8 | 2021-02-27 19:26:52 | 46 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-25
    Description: During the quarter a total of 38 random 30-m2and 152 random 1/4-m2 subtidal stations weresurveyed. Red abalone, Haliotis rufescens,densities remained very low. There was a continueddecline in densities of giant red seaurchins, Strongylocentrotus franciscanus, inDiablo Cove as well as the North Control area.The annual shore census of bull kelp, Nereocystisluetkeana, revealed the lowest number of plantsin the surface canopy in Diablo Cove since 1973. The subtidal station data supported this observation.Sea otter, Enhydra lutris, observations werecontinued. A small group of otters continuedto raft in the Cove east of Lion Rock. Someof these otters probably forage as far south asSouth Cove.The survey of 11 random intertidal stationscompleted our Upwelling sampling effort. (16pp.)
    Keywords: Ecology ; Fisheries ; Biology
    Repository Name: AquaDocs
    Type: monograph
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  • 4
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    Diablo Canyon power plant site ecological study Annual Report July 1, 1976 - June 30, 1977 and Quarterly Report no. 16 April 1, 1977 - June 30, 1977 (2021)
    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
    Details
    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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  • 5
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    Diablo Canyon power plant site ecological study Quarterly Report No. 14 (2021)
    California Department of Fish and Game, Marine Resources Region | Avila Beach, CA
    In:  http://aquaticcommons.org/id/eprint/134 | 8 | 2011-09-29 22:31:37 | 134 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-26
    Description: We surveyed eight of the permanent subtidal stations, and spent considerable time replacing surface and subsurface buoys on these stations. Little change was evident in densities of quantified invertebrates. Densities of some of the brown algae continued to increase. Surveys of random 30-m2 subtidal stations in the North Control were completed.Davidson current oceanographic period intertidal surveys were begun. High seas prevented us from occupying stations on several days of excellent minus tides; however, 12 random and 4 permanent stations were surveyed. The annual census of bull kelp, Nereocystis luetkeana, yielded a count of 11,323 surface canopy plants, a decrease from last year's estimate. Foam observations were continued in Diablo Cove. (15pp.)
    Keywords: Ecology ; Fisheries ; Diablo Canyon Power Plant ; California ; environmental impact
    Repository Name: AquaDocs
    Type: monograph
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