Differences in foraging ecology align with genetically divergent ecotypes of a highly mobile marine top predator

@article{Jeglinski2015DifferencesIF,
  title={Differences in foraging ecology align with genetically divergent ecotypes of a highly mobile marine top predator},
  author={Jana W. E. Jeglinski and Jochen B. W. Wolf and Christiane Werner and Daniel P. Costa and Fritz Trillmich},
  journal={Oecologia},
  year={2015},
  volume={179},
  pages={1041-1052}
}
Foraging differentiation within a species can contribute to restricted gene flow between ecologically different groups, promoting ecological speciation. Galapagos sea lions (Zalophus wollebaeki) show genetic and morphological divergence between the western and central archipelago, possibly as a result of an ecologically mediated contrast in the marine habitat. We use global positioning system (GPS) data, time-depth recordings (TDR), stable isotope and scat data to compare foraging habitat… 
Intraspecific variation in feeding strategies of Galapagos sea lions: A case of trophic specialization
TLDR
Results constitute a relevant finding in the evolutionary behavior of the species, showing that Z. wollebaeki has developed a high degree of foraging flexibility, thus increasing its survival rate in an ecosystem that is highly demanding in terms of resource availability.
Pup Vibrissae Stable Isotopes Reveal Geographic Differences in Adult Female Southern Sea Lion Habitat Use during Gestation
TLDR
Habitat use was unrelated to the proximity of breeding colonies to the Patagonian Shelf, and points towards other factors, such as local oceanography and its influence on resource distribution, playing a prominent role in inshore and offshore habitat use.
Geographic variation in the foraging behaviour of South American fur seals
The implicit assumption of many ecological studies is that animal behaviour and resource use are geographically uniform. However, central place foraging species often have geographically isolated
Reproductive performance of a tropical apex predator in an unpredictable habitat
TLDR
The long-term dataset for Galapagos sea lion females, a tropical apex predator, shows that the trade-off between current and future reproduction figures prominently in their life history, and they produce a low, but stable reproductive output largely unaffected by variation in early life history traits and largely independent of environmental unpredictability.
Is recolonization pattern related to female philopatry? An insight into a colonially breeding mammal
TLDR
The recolonization of SASL may be the effect of weak female philopatry attenuated and/or interacting with other processes like site fidelity to near-by feeding grounds, breeding success, terrestrial habitat selection for breed and dispersal.
Individuality counts: A new comprehensive approach to foraging strategies of a tropical marine predator.
TLDR
This study used high-resolution measures of depth, GPS position and acceleration collected from 39 lactating sea lion females to analyze their foraging strategies at an unprecedented level of detail using a novel combination of automated broken stick algorithm, hierarchical cluster analysis and individually fitted multivariate hidden Markov models.
δ13C and δ15N values in pup whiskers as a proxy for the trophic behavior of Galapagos sea lion females
TLDR
Through the analysis of pup samples, insights are obtained into the trophic ecology and metabolic processes behind the isotopic signatures of Z. wollebaeki females that give an insight into the foraging ecology of their mothers during the pre- and post-partum stages.
Decadal-scale variation in diet forecasts persistently poor breeding under ocean warming in a tropical seabird
TLDR
The indirect effect of ocean warming on a top predator, Nazca boobies in the equatorial Galápagos Islands, is forecast, where rising water temperature is expected to exceed the upper thermal tolerance of a key prey item in the future, severely reducing its availability within the Boobies’ foraging envelope.
Changes in the Galapagos sea lion diet as a response to El Niño-Southern Oscillation
TLDR
This apex predator exhibited trophic flexibility during ENSO, evidenced by a rapid response to anomalous environmental conditions that included reducing the foraging niche and increasing the consumption of prey from greater depths.
Diving deep into trouble: the role of foraging strategy and morphology in adapting to a changing environment
TLDR
A systematic review of diving behaviour and physiology revealed that a foraging strategy (epipelagic vs mesopelagic or benthic) was more important in predicting dive behaviour than morphology.
...
1
2
3
...

References

SHOWING 1-10 OF 80 REFERENCES
Tracing early stages of species differentiation: Ecological, morphological and genetic divergence of Galápagos sea lion populations
TLDR
This study challenges the view that geographical barriers are strictly needed for the build-up of genetic divergence and suggests a key role of intra- as well as inter-specific niche segregation in the evolution of genetic structure among populations of a highly mobile species under conditions of free movement.
Population structure of adult female Australian sea lions is driven by fine-scale foraging site fidelity
TLDR
It is proposed that foraging specialization within discrete fine-scale foraging areas and habitats at the individual level limits the dispersive capacity of adult female Australian sea lions which in turn drives population structure.
Ecological opportunities and specializations shaped genetic divergence in a highly mobile marine top predator
TLDR
It is suggested that ecological opportunity to specialize is a major driver of genetic and morphological divergence in bottlenose dolphins.
Oxygen stores plasticity linked to foraging behaviour and pregnancy in a diving predator, the Galapagos sea lion
TLDR
The Galapagos sea lion (GSL) Zalophus wollebaeki is endangered and its population is declining, and inter and intraseasonal physiological response coupled with diving behaviour in the same sex and age class of an air-breathing diving vertebrate is document for the first time.
Ecological separation in a polymorphic terrestrial salamander.
TLDR
A polymorphic population of Plethodon cinereus (red-backed salamanders) is examined for evidence of sympatric ecological separation by colour morphology and it is concluded that the two colour morphs exhibit some degree of ecological separation and tend to mate assortatively.
Sex-specific foraging strategies and resource partitioning in the southern elephant seal (Mirounga leonina)
TLDR
The possibility that individual southern elephant seals are pursuing specialist foraging strategies to avoid competition, both with one another, and with the South American sea lions that breed nearby is discussed.
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.
Gut length plasticity in Eurasian perch : Into the bowels of resource polymorphisms
TLDR
It is concluded that small scaled genetic differentiation might be more common than currently acknowledged, that more multi-factorial studies are needed if the authors are to fully understand the mechanisms behind trait diversity, and that competition not always favors divergence.
Colony-specific foraging behaviour and co-ordinated divergence of chick development in the wedge-tailed shearwater Puffinus pacificus
TLDR
Examination of divergence in foraging, provisioning and chick developmental patterns between wedge-tailed shearwaters Puffinus pacificus breeding at a temperate and sub-tropical location suggests co-ordinated environmentally determined divergent coevolution of chick and adult life-history parameters between these 2 locations.
Detecting alternate foraging ecotypes in Australian sea lion (Neophoca cinerea) colonies using stable isotope analysis
TLDR
The development of a screening technique to identify different foraging ecotypes and assess their relative frequencies in Australian sea lion breeding colonies using stable isotope ratios in pups is reported and ecological partitioning over such a small spatial scale has not been described in any other otariid species.
...
1
2
3
4
5
...