California sea lions (Zalophus californianus californianus) have lower chlorinated hydrocarbon contents in northern Baja California, México, than in California, USA

2006 ◽  
Vol 142 (1) ◽  
pp. 83-92 ◽  
Author(s):  
Ligeia Del Toro ◽  
Gisela Heckel ◽  
Víctor F. Camacho-Ibar ◽  
Yolanda Schramm
Keyword(s):  
Baja California ◽  
Zalophus Californianus ◽  
California Sea Lions ◽  
Chlorinated Hydrocarbon ◽  
Sea Lions

Winter Migration of Subadult Male California Sea Lions (Zalophus californianus) in the Southern Part of Baja California

1983 ◽  
Vol 64 (3) ◽  
pp. 513-518 ◽  
Author(s):  
D. Aurioles ◽  
F. Sinsel ◽  
C. Fox ◽  
E. Alvarado ◽  
O. Maravilla
Keyword(s):  
Baja California ◽  
Zalophus Californianus ◽  
California Sea Lions ◽  
Subadult Male ◽  
Sea Lions ◽  
Winter Migration

Heavy Metal and Chlorinated Hydrocarbon Residues in California Sea Lions (Zalophus californianus californianus)

1975 ◽  
Vol 32 (12) ◽  
pp. 2391-2397 ◽  
Author(s):  
Donald R. Buhler ◽  
Robert R. Claeys ◽  
Bruce R. Mate
Keyword(s):  
Heavy Metal ◽  
Total Mercury ◽  
Chlorinated Hydrocarbons ◽  
Zalophus Californianus ◽  
Sea Lion ◽  
California Sea Lions ◽  
Oregon Coast ◽  
Chlorinated Hydrocarbon ◽  
Sea Lions

Samples of various tissues and organs from healthy California sea lions (Zalophus californianus californianus) and sick animals (apparently with leptospirosis) collected along the central Oregon coast in 1970, 1971, and 1973 were analyzed for total mercury, methylmercury, cadmium, and chlorinated hydrocarbons. Maximum mercury concentrations of 74–170 ppm occurred in sea lion liver, but only 1.6–3.7% of this was present as methylmercury. Cadmium was concentrated primarily in the kidney which contained 7.2–12.0 ppm of the metal. Chlorinated hydrocarbon residues in sea lion fat ranged between 253–475 ppm DDE, and 21.2 and 34.1 ppm PCB. Although mercury, cadmium, and chlorinated hydrocarbon residues in some of the sick sea lions were significantly higher than those present in healthy animals, it is not possible to relate these differences to the onset of leptospirosis.

New polymorphic microsatellite markers for California sea lions (Zalophus californianus)

2005 ◽  
Vol 5 (1) ◽  
pp. 140-142 ◽  
Author(s):  
F. D. HERNANDEZ-VELAZQUEZ ◽  
C. E. GALINDO-SANCHEZ ◽  
M. I. TAYLOR ◽  
J. DE LA ROSA-VELEZ ◽  
I. M. COTE ◽  
...  
Keyword(s):  
Microsatellite Markers ◽  
Zalophus Californianus ◽  
California Sea Lions ◽  
Sea Lions ◽  
Polymorphic Microsatellite

Quantifying errors associated with using fecal samples to determine the diet of the California sea lion (Zalophus californianus)

2001 ◽  
Vol 79 (6) ◽  
pp. 1080-1087 ◽  
Author(s):  
Anthony J Orr ◽  
James T Harvey
Keyword(s):  
Zalophus Californianus ◽  
Correction Factors ◽  
Sea Lion ◽  
California Sea Lions ◽  
California Sea Lion ◽  
Fecal Samples ◽  
Sea Lions ◽  
Mesh Bag ◽  
Estimate Number ◽  
Fish Otoliths

The purpose of this study was to quantify the errors associated with using fecal samples to determine the diet of the California sea lion (Zalophus californianus). Fishes and squids of known size and number were fed to five sea lions held in enclosures with seawater-filled pools. Enclosures were washed and pools were drained periodically so that sea lion feces could be collected using a 0.5 mm mesh bag. Fish otoliths and squid beaks were collected from feces and used to estimate number and size of prey eaten. An average of 50.7% (SE = 6.4%) of 430 fishes and 73.5% (SE = 12.0%) of 49 cephalopods fed to sea lions were represented by otoliths and beaks in feces, respectively. Estimated lengths of fish from feces were less than lengths of fish fed to sea lions by an average of 30.1% (SE = 2.8%). Beaks were not digested significantly; estimated lengths of squid were underestimated by an average of only 3.3% (SE = 1.5%) relative to actual lengths. Passage rates of otoliths varied, but more than 70% were recovered within 48 h after the fish was consumed. Passage rates of beaks were generally less than those of otoliths; six beaks (11%) were collected in feces 4 days after the squid were eaten. Correction factors were created to more reliably estimate the number and size of fishes and cephalopods eaten by California sea lions.

Prevalence of Urogenital Carcinoma in Stranded California Sea Lions (Zalophus californianus) from 2005–15

2018 ◽  
Vol 54 (3) ◽  
pp. 581-586 ◽  
Author(s):  
Alissa C. Deming ◽  
Kathleen M. Colegrove ◽  
Padraig J. Duignan ◽  
Ailsa J. Hall ◽  
James F. X. Wellehan ◽  
...  
Keyword(s):  
Zalophus Californianus ◽  
California Sea Lions ◽  
Sea Lions ◽  
Urogenital Carcinoma

scholarly journals Isolation of a novel adenovirus from California sea lions Zalophus californianus

2011 ◽  
Vol 94 (3) ◽  
pp. 243-248 ◽  
Author(s):  
T Goldstein ◽  
KM Colegrove ◽  
M Hanson ◽  
FMD Gulland
Keyword(s):  
Zalophus Californianus ◽  
California Sea Lions ◽  
Sea Lions

scholarly journals Determination of a Sedative Protocol for Use in California Sea Lions (Zalophus californianus) with Neurologic Abnormalities Undergoing Electroencephalographic Examination

2008 ◽  
Vol 39 (4) ◽  
pp. 542-547 ◽  
Author(s):  
Sophie Dennison ◽  
Martin Haulena ◽  
D. Colette Williams ◽  
John Dawson ◽  
Brian S. Yandell ◽  
...  
Keyword(s):  
Zalophus Californianus ◽  
California Sea Lions ◽  
Sea Lions

Pathology of Domoic Acid Toxicity in California Sea Lions (Zalophus californianus)

2005 ◽  
Vol 42 (2) ◽  
pp. 184-191 ◽  
Author(s):  
P. A. Silvagni ◽  
L. J. Lowenstine ◽  
T. Spraker ◽  
T. P. Lipscomb ◽  
F. M. D. Gulland
Keyword(s):  
Harmful Algal Blooms ◽  
Algal Blooms ◽  
Domoic Acid ◽  
Pyramidal Cells ◽  
Granular Cell ◽  
Zalophus Californianus ◽  
California Sea Lions ◽  
Neuronal Necrosis ◽  
Hydropic Degeneration ◽  
Sea Lions

Over 100 free-ranging adult California sea lions ( Zalophus californianus) and one Northern fur seal ( Callorhinus ursinus), predominantly adult females, were intoxicated by domoic acid (DA) during three harmful algal blooms between 1998 and 2000 in central and northern California coastal waters. The vector prey item was Northern anchovy ( Engraulis mordax) and the primary DA-producing algal diatom was Psuedonitzschia australis. Postmortem examination revealed gross and histologic findings that were distinctive and aided in diagnosis. A total of 109 sea lions were examined, dying between 1 day and 10 months after admission to a marine mammal rehabilitation center. Persistent seizures with obtundation were the main clinical findings. Frequent gross findings in animals dying acutely consisted of piriform lobe malacia, myocardial pallor, bronchopneumonia, and complications related to pregnancy. Gross findings in animals dying months after intoxication included bilateral hippocampal atrophy. Histologic observations implicated limbic system seizure injury consistent with excitotoxin exposure. Peracutely, there was microvesicular hydropic degeneration within the neuropil of the hippocampus, amygdala, pyriform lobe, and other limbic structures. Acutely, there was ischemic neuronal necrosis, particularly apparent in the granular cells of the dentate gyrus and the pyramidal cells within the hippocampus cornu ammonis (CA) sectors CA4, CA3, and CA1. Dentate granular cell necrosis has not been reported in human or experimental animal DA toxicity and may be unique to sea lions. Chronically, there was gliosis, mild nonsuppurative inflammation, and loss of laminar organization in affected areas.

Sign in / Sign up

Export Citation Format

Share Document