To this end, CalCOFI conducts quarterly cruises offshore of southern California collecting a suite of hydrographic and biological data at 66 core and 9 coastal stations. Data collected at depths down to 500 m include: temperature, salinity, oxygen, phosphate, silicate, nitrate and nitrite, chlorophyll, C14 primary productivity, phytoplankton biodiversity, zooplankton biomass, and zooplankton biodiversity. Ancillary data collected include bio-optics, air-sea interface, and atmospheric measurements, continuous underway sea surface measurements (temperature, salinity, fluorescence); Acoustic Doppler Current Profiler (ADCP) data; trace metals; sediments; MOCNESS net sampling; and the Continuous Underway Fish Egg Sampler (CUFES). Sea bird visual surveys are conducted during transits between stations. Recently, the CCE-LTER project has expanded CalCOFI goals and added additional sampling including seasonal process cruises and autonomous gliders along lines 83 and 90 (see maps).
In April 2004, our lab added a visual and acoustic marine mammal survey component to the CalCOFI project to study cetacean ecology and habitat. Visual monitoring is conducted during quarterly cruises by experienced marine mammal observers using handheld 7x binoculars. Supplementary Bigeyes (25x) or image stabilizer hand-held binoculars (18x) are used for species identification when necessary. Visual monitoring provides excellent data for highly visible species in calm to moderate weather. Concurrently, acoustic technicians survey with a towed hydrophone array during the transit between CalCOFI stations and with sonobuoys while on station, allowing collection of distribution data on vocal animals that may have been missed visually due to darkness, rough weather, distance from transect line, being underwater, or other reasons. Additionally, long-term acoustic monitoring is conducted at seven CalCOFI stations using bottom-mounted, HARPs. These data will provide information on the annual and seasonal presence of cetaceans, and may be used to evaluate daily patterns of vocalization behavior. By integrating CalCOFI environmental and cetacean data, we plan to develop ecological models for cetacean habitat in the region offshore of southern California and to improve our understanding of their role in the California Current ecosystem.
The most commonly sighted species on visual surveys conducted between July 2004 and
November 2005 were blue, fin, humpback, and sperm whales, and Pacific white-sided, short-beaked common, and long-beaked common dolphins. Blue, fin, and sperm
whales were sighted more frequently in summer to fall months, while northern right whale dolphins and Dall’s porpoises were sighted more frequently in winter and
spring. Spatial patterns of occurrence are evident for all species within the study area.
Bjorkstadt et al. State of the California Current 2010-2011: Regionally Variable Responses to a Strong (but Fleeting?) La Nina. CalCOFI Rep., Vol. 52, 2011.
Bjorkstadt et al. State of the California Current 2009-2010: Regional Variation Persists Through Transition from La Nina to El Nino (and back?). CalCOFI Rep., Vol. 51, 2010.
McClatchie et al. State of the California Current, Spring 2008-2009: Cold Conditions Drive Regional Differences in Coastal Production. CalCOFI Rep., Vol. 50, 2009.
McKinnell et al. Marine Ecosystems of the North Pacific Ocean, 2003-2008.
Munger et al. Baleen Whale Distribution Relative to Surface Temperature and Zooplankton Abundance Off Southern California, 2004-2008. CalCOFI Rep., Vol. 50, 2009.
Soldevilla et al. Marine Mammal Monitoring and Habitat Investigations During CalCOFI Surveys. CalCOFI Rep., Vol. 47, 2006.
Campbell et al. CalCOFI Cruises: 2010-2011.
Campbell et al. CalCOFI Cruises: 2009-2010.
Hildebrand. Marine Mammal Acoustic Monitoring and Habitat Investigation, Southern California Offshore Region. 2007.
Merkens et al. Cetacean distribution relative to zooplankton biomass along southern CalCOFI survey lines, 2004-2008. CalCOFI Conference 2008.
Merkens et al. Sperm whale season presence in the southern CalCOFI region. CalCOFI Conference 2009.
Campbell et al. Modeling Trends in Cetacean Habitat Use and Density on the Southern CalCOFI Lines. CalCOFI Conference 2011.
Campbell et al. Acoustic and Visual Detections of Odontocetes from Line Transect Surveys of Southern California. SMM Conference 2009.
Campbell et al. CalCOFI Marine Mammal Monitoring. CCE LTER Conference 2011.
Camacho. Influence of ocean fronts on cetacean habitat selection and diversity within the CalCOFI study area. SIO MAS Symposium 2010.
Oedekoven et al. Using spatio-temporal models of line transect abundance estimates for trend estimation. SMM Conference 2011.
Munger et al. Cetacean visual and acoustic surveys during CalCOFI season cruises in Southern California, 2004-2009: Baleen Whales. SMM Conference 2009.