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USING CARBON AND NITROGEN ISOTOPE VALUES TO INVESTIGATE MATERNAL STRATEGIES IN NORTHEAST PACIFIC OTARIIDS
TLDR
The study indicates that nitrogen, and in some cases carbon, isotopes can be used to assess reproductive strategies in marine mammals and when coupled with accurate age estimates based on bone growth regressions can be applied to historical or fossil otariids to gain insight into the flexibility of maternal strategies within and across species.
Inferring spatial structure from time‐series data: using multivariate state‐space models to detect metapopulation structure of California sea lions in the Gulf of California, Mexico
Summary 1. Understanding spatial structure and identifying subpopulations are critical for estimating population growth rates and extinction risk, and as such essential for e!ective conservation
Multiple foraging strategies in a marine apex predator, the Galapagos sea lion Zalophus wollebaeki
TLDR
The Galapagos sea lion Z. wollebaeki's wide foraging range coupled with their use of multiple haul-out sites should be considered in future studies when determining foraging trip lengths and habitat utilization since presence/absence from the colony does not reflect foraged trip length.
Individual trophic specialisation and niche segregation explain the contrasting population trends of two sympatric otariids
TLDR
Behavioural constraints during the breeding season, intraspecific competition and a major dependence on resources of the Uruguayan coastal shelf may explain why SASL had a higher trophic individual specialisation and a larger vulnerability in a heavily exploited habitat by fisheries and, by consequence, a locally declining population trend.
Multiple foraging strategies in a marine apex predator, the Galapagos Sea Lion
TLDR
The Galapagos sea lion Z. wollebaeki’s wide foraging range coupled with their use of multiple haul-out sites should be considered in future studies when determining foraging trip lengths and habitat utilization since presence/absence from the colony does not reflect foraged trip length.
Prepartum and postpartum trophic segregation between sympatrically breeding female Arctocephalus australis and Otaria flavescens
TLDR
Stable isotope analysis suggested a lack of trophic overlap between lactating females; both serum and skin samples from sea lion pups had significantly greater &dgr;13C and &dGr;15N values than samples from fur seal pups, suggesting that lactating sea lions forage near shore, whereas lactating fur seals forage offshore.
Seasonal and Bathymetric Changes in Feeding Habits of the Benthic Red Crab Pleuroncodes Planipes (Decapoda, Anomura, Galatheidae) Off the Pacific Coast of Baja California Sur, Mexico
TLDR
The stomach contents in benthic red crabs indicate a decreasing availability of food in the area from winter-spring through the summer, which correlates well with the diminishing intensity of the coastal upwelling system and weakening of the California Current.
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