“Alex is an excellent project manager, team player and analyst. He embodies what is truely the "best" in team work environment, regardless if you are an internal customer or an external customer. He has the ability to quickly determine what the the goals for a project are and assess what is needed for it to succeed. I would put Alex on my team without hesitation.”
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Experienced Geospatial Analyst with a demonstrated history of working in the information…
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Three and half years ago I quarantined on an island for two weeks to safely board an insane research vessel with a crew and other scientists I'd…
Three and half years ago I quarantined on an island for two weeks to safely board an insane research vessel with a crew and other scientists I'd…
Liked by Alex G. Kesaris, GISP
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I’m pleased to share that I’ve accepted a position at the National Renewable Energy Laboratory. In my new role I’ll focus on understanding the…
I’m pleased to share that I’ve accepted a position at the National Renewable Energy Laboratory. In my new role I’ll focus on understanding the…
Liked by Alex G. Kesaris, GISP
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We’re pleased to announce that Dave Bernstein has been promoted to Vice President of Hydrospatial Operations at NV5. Dave spent over 20 years with…
We’re pleased to announce that Dave Bernstein has been promoted to Vice President of Hydrospatial Operations at NV5. Dave spent over 20 years with…
Liked by Alex G. Kesaris, GISP
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Northern Range Expansion of California Coastal Bottlenose Dolphins (Tursiops truncatus)
Aquatic Mammals
The California coastal stock of bottlenose dolphins (Tursiops truncatus) expanded its range north from the Southern California Bight, its historical range, into Central California coinci- dent with the 1982-1983 El Niño event. Since the late 1980s, bottlenose dolphin sightings north of Central California have been increasingly reported. To determine the present-day northern range limit for these dolphins, photo-identifica- tion efforts were carried out from 2007 to 2018 in San Francisco Bay and…
The California coastal stock of bottlenose dolphins (Tursiops truncatus) expanded its range north from the Southern California Bight, its historical range, into Central California coinci- dent with the 1982-1983 El Niño event. Since the late 1980s, bottlenose dolphin sightings north of Central California have been increasingly reported. To determine the present-day northern range limit for these dolphins, photo-identifica- tion efforts were carried out from 2007 to 2018 in San Francisco Bay and nearby coastal waters during which 84 individuals were identified. The results demonstrate a significant range expan- sion along the Northern California coast at least as far as Sonoma County (38.7o N). Comparisons with photo-identification catalogs compiled south of San Francisco from 1981 to 2015 revealed that 92% of the 84 dolphins were matched to Monterey Bay (n = 77), Santa Barbara (n = 27), Santa Monica Bay (n = 29), Orange County (n = 9), Corona Del Mar (n = 2), San Diego (n = 31), and Ensenada, Mexico (n = 1). Many of the 84 dolphins (54%) showed long-range movements across the stock’s range between the Southern California Bight and the San Francisco Bay Area. The greatest movement distance recorded was by two individuals first observed in San Diego, California, in the 1980s and subsequently in Puget Sound, Washington (47o N), in 2017, setting a coastal bottlenose dolphin long-distance move- ment record of at least 2,500 km.
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Coastal bottlenose dolphins off California and northern Baja, Mexico: Photo-identification catalog 1981-2014
NOAA-TM-NMFS-SWFSC-566
My contributions to analysis and integration of this 33-year dolphin photo-ID catalog are acknowledged by authors D. W. Weller and R. H. Defran. My analyst work included: (1) SDSU: field data collection 1989, photo-ID analysis of 1984-89 data; (2) Scripps: field data collection during 2010-11; (3) Sustenant Consulting: field data collection 2012; digital photo-ID analysis and integration of 1981-2014 data for San Diego, San Quintin, Ensenada; Orange County, and Santa Barbara, resulting in…
My contributions to analysis and integration of this 33-year dolphin photo-ID catalog are acknowledged by authors D. W. Weller and R. H. Defran. My analyst work included: (1) SDSU: field data collection 1989, photo-ID analysis of 1984-89 data; (2) Scripps: field data collection during 2010-11; (3) Sustenant Consulting: field data collection 2012; digital photo-ID analysis and integration of 1981-2014 data for San Diego, San Quintin, Ensenada; Orange County, and Santa Barbara, resulting in catalog of 1,291 dolphins; editing of catalog intro pages; and, production of photo catalog database and pages for 1,291 dolphins.
This catalog presents identification photographs of 1,291 Pacific coast bottlenose dolphins (Tursiops truncatus) obtained during dedicated research surveys carried out between 1981 and 2014 in five coastal study areas: Ensenada, Mexico; San Quintín, Mexico; San Diego, CA; Orange County, CA; and Santa Barbara, CA. These images were primarily collected by the Southwest Fisheries Science Center (National Marine Fisheries Service, NMFS), the Cetacean Behavior Laboratory (San Diego State University, CBL), and Scripps Whale Acoustics Lab (Scripps Institution of Oceanography, SIO). Some images were provided to the CBL by collaborators in the U.S. and Mexico.
The overarching objectives of making this catalog publically available are twofold: (1) to facilitate regional and international cooperation and collaboration between current and future research groups collecting data on Pacific coast bottlenose dolphins; and (2) to provide an individual identification numbering scheme and standardized images of Pacific coast bottlenose dolphins that can be used for comparison by other research groups and organizations. This catalog is available on request in PDF format and online at SWFSC https://swfsc.noaa.gov/ as part of the Cetacean Health and Life History Program and OBIS SEAMAP http://seamap.env.duke.edu/ as part of the California Dolphin Online Catalog (CDOC).Other authors -
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MARK-RECAPTURE ABUNDANCE ESTIMATE OF CALIFORNIA COASTAL STOCK BOTTLENOSE DOLPHINS: NOVEMBER 2009 TO APRIL 2011
NOAA-TM-NMFS-SWFSC-563 U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Marine Fisheries Service
The occurrence, distribution, group size and abundance of California coastal stock bottlenose dolphins (Tursiops truncatus) were assessed during a boat-based photo-identification study between November 2009 and April 2011 off San Diego, California. A total of 31 photographic surveys were completed and dolphin groups were encountered on 30 (97%) of them. A total of 115 dolphin groups were observed and 346 individuals photographically identified. All groups were sighted within approximately 1-2…
The occurrence, distribution, group size and abundance of California coastal stock bottlenose dolphins (Tursiops truncatus) were assessed during a boat-based photo-identification study between November 2009 and April 2011 off San Diego, California. A total of 31 photographic surveys were completed and dolphin groups were encountered on 30 (97%) of them. A total of 115 dolphin groups were observed and 346 individuals photographically identified. All groups were sighted within approximately 1-2 km of shore. The mean group size was 8.2 (SE = 0.6) and the average number of dolphins and groups encountered per survey was 31.5 (SE = 4.2) and 3.9 (SE = 0.5), respectively. Low resighting rates (mean = 2.2; SE = 0.8) and an ever-increasing rate of discovery for previously unidentified dolphins were observed. Strikingly, 258 of the 346 identified dolphins during this study were not represented in the prior 1981-2005 photo-identification catalog for San Diego. Dolphins were considered “marked” if they had two or more dorsal fin nicks. Mark-recapture analysis using POPAN as well as closed models in RMark produced abundance estimates of 515 marked dolphins (95% CI = 470-564, SE = 24.0) and 453 marked dolphins (95% CI = 411-524, SE = 28.1), respectively. Differences in encounter rates, group size and number of groups encountered per survey during the 2009-2011 study were apparent when compared to earlier studies in the same area between 1984 and 2005.
Other authors -
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Aerial sardine surveys in the Southern California Bight
California Fish and Game 100(2):260-275; 2014 STATE OF CALIFORNIA CALIFORNIA NATURAL RESOURCES AGENCY FISH AND GAME COMMISSION DEPARTMENT OF FISH AND WILDLIFE
Current survey indices used in annual stock assessments to manage the federal Pacific sardine (Sardinops sagax caerulea) fishery do not include nearshore sardine biomass in southern California waters. This survey uses direct observer estimates of sardine biomass in nearshore and offshore waters of the Southern California Bight to calculate an index of relative abundance. Surveys have been conducted since summer of 2012 and have continued through the spring and summer 2013 seasons. Aerial…
Current survey indices used in annual stock assessments to manage the federal Pacific sardine (Sardinops sagax caerulea) fishery do not include nearshore sardine biomass in southern California waters. This survey uses direct observer estimates of sardine biomass in nearshore and offshore waters of the Southern California Bight to calculate an index of relative abundance. Surveys have been conducted since summer of 2012 and have continued through the spring and summer 2013 seasons. Aerial identifications of fish school species have been validated using boat sampling of aerial sightings and demographic information obtained from collected samples. Additionally, habitat analyses compared sardine distribution with environmental variables (sea surface temperature and chlorophyll a concentrations).
Other authors -
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California Dolphin Online Catalog
American Cetacean Society 13th Annual Conference - Nov 9-11, 2012 San Diego, CA
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If you are interested in attending URISA_International’s inaugural Advanced GIS Leadership Academy (AGLA), the faculty got together and discussed…
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Pleased to announce that my poster proposal "Unveiling Geographical Dynamics of California Coastal Bottlenose Dolphins: A Multifaceted Exploration"…
Pleased to announce that my poster proposal "Unveiling Geographical Dynamics of California Coastal Bottlenose Dolphins: A Multifaceted Exploration"…
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