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CalCOFICalifornia Cooperative Oceanic Fisheries Investigations
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For all CalCOFI surveys, observations were made on daytime tracklines between stations, and no visual observation effort was conducted while the vessel was stationary.
Furthermore, they were not distinguished on SWFSC cruises before 1991 or on CalCOFI cruises before August 2004.
Although sea state has been shown to be an important predictor of sighting rates in other cetacean habitat and trend models (Becker, 2007), the condition of the sea surface was not recorded in early CalCOFI observations and, therefore, sea state was not included in this analysis.
Of the 9 models, 7 models included the SurveyType variable; the 1987-2004 CalCOFI cruises ranked lowest and the SWFSC cruises ranked highest in sighting numbers for most species.
Sighting and effort data from the 16 CalCOFI cruises were split into 2 effort categories: 1) on-effort sightings on the 6 CalCOFI transect lines, the sightings that form the basis of all analyses and findings; and 2) opportunistic effort (sightings made off effort or when a vessel was not on a CalCOFI transect line), which is presented to show species diversity and presence or absence of species.
Including all survey effort from the southern CalCOFI transect lines, observers collected visual data on marine mammals over 267 days and searched 25,079 km of transect lines.
Our observations from the 16 CalCOFI surveys conducted between 2004 and 2008 provide the most current and consistent data set on seasonal shifts in movements and abundance for the most commonly encountered marine mammal species in the Southern California region.
2], is larger than the study area of the CalCOFI surveys by 25%.
We used CalCOFI data to model the likelihood of capturing Pacific mackerel larvae as a function of water temperature, zooplankton displacement volume, geostrophic flow (i.
Pacific mackerel larvae and oceanographic data were collected during CalCOFI cruises from 1951 to 2008.
Samples of eggs from CalCOFI tows collected during 1988-2009 were resorted to identify those of Pacific mackerel.
Detailed sampling protocols for the CalCOFI bottle and CTD samples are described by Lynn et al.