Results 51 to 60 of about 4,725 (205)

Ontogenetic changes and sexual dimorphism in the cranium and mandible of the Atlantic walrus (Odobenus rosmarus rosmarus L.)

The Anatomical Record, EarlyView.
Abstract Walruses have been an important subsistence and cultural resource for humans and have been exploited for millennia across their distribution. This exploitation has contributed to severe declines in several populations and local extirpations.
Katrien Dierickx, Oliver Kersten, Youri van den Hurk, Brenna A. Frasier, Richard Sabin, Bastiaan Star, James H. Barrett   +6 more
wiley   +1 more source

A systematic review of the agents and factors influencing California sea lion health

Frontiers in Marine Science
Marine ecosystems are increasingly affected by climate-driven disturbances such as sea-level rise, marine heatwaves, ocean acidification, and pollution. Monitoring sentinel species is essential for detecting long-term environmental changes and informing ...
Yeimy A. Rojas-Castellanos, Lili Pelayo-González, Claudia J. Hernández-Camacho   +2 more
doaj   +1 more source

Can Sea Lions’ (Zalophus californianus) Use Mirrors to Locatean Object? [PDF]

International Journal of Comparative Psychology, 2015
Although California sea lions (Zalophus californianus) are capable of forming complex mental concepts, they have failed to demonstrate mirror self-recognition, a skill that requires both a mental representation of one’s physical features and knowledge of a reflective surface.
Hill, Heather M., Webber, Krista, Kemery, Alicia, Garcia, Melissa, Kuczaj, II, Stan A   +4 more
openaire   +3 more sources

Spatial and temporal variation in the diet of the California sea lion (Zalophus californianus) in the Gulf of California, Mexico [PDF]

, 2004
Between June 1995 and May 1996 seven rookeries in the Gulf of California were visited four times in order to collect scat samples for studying spatial and seasonal variability California sea lion prey.
Aurioles-Gamboa, David, Garcia-Rodriguez, Francisco J.   +1 more
core  

Patterns of spinal motion, kinematic spaces and the land‐to‐sea transition in carnivorans

The Anatomical Record, EarlyView.
Using 3D reconstructions, we quantify intervertebral joint mobility to investigate how cervical, thoracic, and lumbar vertebral regions evolved distinct kinematic roles in pinnipeds. The findings reveal lineage‐specific adaptations for swimming and highlight the functional significance of vertebral joint flexibility in ecological transitions.
Juan Miguel Esteban, Alberto Martín‐Serra, Alejandro Pérez‐Ramos, Borja Figueirido   +3 more
wiley   +1 more source

Serum cortisol in California sea lion pups (Zalophus californianus californianus)

Animal Welfare, 2010
AbstractMarine ecosystems are exposed to a wide variety of factors that may produce disturbances in their structure and functioning. The Gulf of California supports fisheries, tourism, intensive agriculture, mining, and more recently, shrimp aquaculture.
C Pedernera-Romano, D Aurioles-Gamboa, RA Valdez, DM Brousset, MC Romano, F Galindo   +5 more
openaire   +1 more source

First Non‐Invasive Monitoring of Fecal Steroids in Greater Caribbean Manatees (Trichechus manatus manatus)

Zoo Biology, EarlyView.
This study established the first fecal hormonal reference values (P4/E2) for the Greater Caribbean manatee. Using non‐invasive ELISA, the authors found no significant differences between mature and immature females, highlighting that long‐term monitoring and ultrasounds are essential to fully understand their complex reproductive cycles.
Vanessa Bermúdez‐Cardona, Roberto Sánchez‐Okrucky, José A. Sandoval‐Zárate, Nataly Castelblanco‐Martínez   +3 more
wiley   +1 more source

Using the Diet Composition of Adult Chinook Salmon to Understand the Regional Structure of Salish Sea Forage Communities

Fisheries Oceanography, EarlyView.
ABSTRACT Small pelagic fish and other forage species are patchily distributed over space and time, resulting in variable foraging conditions experienced by their predators. The high‐resolution data necessary to understand the spatiotemporal structure of forage communities are challenging to collect with expensive fishery‐independent surveys, meaning ...
Wesley L. Greentree, William D. P. Duguid, Micah J. Quindazzi, Bridget Maher, Francis Juanes   +4 more
wiley   +1 more source

Trends and Potential Interactions Between Pinnipeds and Fisheries of New England and the U.S. West Coast [PDF]

, 2000
Long-term trends in the abundance and distribution of several pinniped species and commercially important fisheries of New England and the contiguous U.S. west coast are reviewed, and their actual and potential interactions discussed.
Baraff, Lisa S., Loughlin, Thomas R.
core  

Microhaplotype Methods Enable Relationship Inference in a Bottlenecked Mammalian Species

Animal Conservation, Volume 29, Issue 2, Page 136-145, April 2026.
Northern elephant seals (Mirounga angustirostris) are among the most genetically depauperate mammals in the world. A near‐total population bottleneck in the 19th century, coupled with the breeding system of extreme polygyny, has challenged efforts to estimate individual reproductive success with genetic methods.
Keith M. Hernandez, Anthony J. Clemento, Juliette E. Linossier, Daniel E. Crocker, Daniel P. Costa, Colleen Reichmuth, John Carlos Garza   +6 more
wiley   +1 more source