scholarly journals Taking movement data to new depths: Inferring prey availability and patch profitability from seabird foraging behavior

2017 ◽  
Vol 7 (23) ◽  
pp. 10252-10265 ◽  
Author(s):  
Marianna Chimienti ◽  
Thomas Cornulier ◽  
Ellie Owen ◽  
Mark Bolton ◽  
Ian M. Davies ◽  
...  
Keyword(s):  
Foraging Behavior ◽  
Prey Availability ◽  
Movement Data

Edge effects created by fenced conservation reserves benefit an invasive mesopredator

2020 ◽  
Vol 47 (8) ◽  
pp. 677
Author(s):  
Hugh McGregor ◽  
John Read ◽  
Christopher N. Johnson ◽  
Sarah Legge ◽  
Brydie Hill ◽  
...  
Keyword(s):  
Prey Availability ◽  
South Australia ◽  
Management Tool ◽  
Gps Tracking ◽  
Source Population ◽  
Detection Rates ◽  
Feral Cats ◽  
Movement Data ◽  
Invasive Predators ◽  
Surrounding Landscape

Abstract ContextFenced reserves from which invasive predators are removed are increasingly used as a conservation management tool, because they provide safe havens for susceptible threatened species, and create dense populations of native wildlife that could act as a source population for recolonising the surrounding landscape. However, the latter effect might also act as a food source, and promote high densities of invasive predators on the edges of such reserves. AimsOur study aimed to determine whether activity of the feral cat is greater around the edges of a fenced conservation reserve, Arid Recovery, in northern South Australia. This reserve has abundant native rodents that move through the fence into the surrounding landscape. MethodsWe investigated (1) whether feral cats were increasingly likely to be detected on track transects closer to the fence over time as populations of native rodents increased inside the reserve, (2) whether native rodents were more likely to be found in the stomachs of cats caught close to the reserve edge, and (3) whether individual cats selectively hunted on the reserve fence compared with two other similar fences, on the basis of GPS movement data. Key resultsWe found that (1) detection rates of feral cats on the edges of a fenced reserve increased through time as populations of native rodents increased inside the reserve, (2) native rodents were far more likely to be found in the stomach of cats collected at the reserve edge than in the stomachs of cats far from the reserve edge, and (3) GPS tracking of cat movements showed a selection for the reserve fence edge, but not for similar fences away from the reserve. ConclusionsInvasive predators such as feral cats are able to focus their movements and activity to where prey availability is greatest, including the edges of fenced conservation reserves. This limits the capacity of reserves to function as source areas from which animals can recolonise the surrounding landscape, and increases predation pressure on populations of other species living on the reserve edge. ImplicationsManagers of fenced conservation reserves should be aware that increased predator control may be critical for offsetting the elevated impacts of feral cats attracted to the reserve fence.

Fish Size and Prey Availability Affect Growth, Survival, Prey Selection, and Foraging Behavior of Larval Yellow Perch

2004 ◽  
Vol 133 (3) ◽  
pp. 504-514 ◽  
Author(s):  
Brian D. S. Graeb ◽  
John M. Dettmers ◽  
David H. Wahl ◽  
Carla E. Cáceres
Keyword(s):  
Foraging Behavior ◽  
Yellow Perch ◽  
Prey Availability ◽  
Prey Selection ◽  
Fish Size

Seasonal patterns of prey availability and the foraging behavior of arctic foxes (Alopex lagopus) in a waterfowl nesting area

1991 ◽  
Vol 69 (11) ◽  
pp. 2853-2859 ◽  
Author(s):  
Alice Stickney
Keyword(s):  
Foraging Behavior ◽  
Migratory Birds ◽  
Prey Availability ◽  
Limited Resource ◽  
Seasonal Patterns ◽  
Alopex Lagopus ◽  
Arctic Foxes ◽  
Community Types ◽  
One Year ◽  
Nest Initiation

The foraging behavior of arctic foxes was observed in a waterfowl nesting area on the Yukon–Kuskokwim Delta of Alaska in 1985–1986. Observations were made during peak fox activity from two towers, 3 m high, located in different community types. Data were collected continuously for individual foxes on specific activities, the community in which activities occurred, and the type of food obtained. After migratory birds started nesting in the area, the food potentially available to foxes changed from microtines, old caches, and carrion to include eggs and birds. This change was reflected in the foraging behavior of the foxes as they switched to predation on eggs. After nesting began, the search success rate of foxes increased (from <30% to >50%) and search duration decreased (mean 19.7 s before nest initiation versus mean 9.4 s in mid-incubation) as the rate of food acquisition increased. Over 80% of the eggs taken by foxes were cached rather than eaten immediately, which extended the availability of this temporally limited resource to foxes. Eggs were the primary prey of arctic foxes during the nesting stages in both years, even though microtine populations were high in one year (1985) and low in the other (1986).

scholarly journals Adaptive foraging behaviour increases vulnerability to climate change

2021 ◽  
Author(s):  
Benoit Gauzens ◽  
Benjamin Rosenbaum ◽  
Gregor Kalinkat ◽  
Thomas Boy ◽  
Malte Jochum ◽  
...  
Keyword(s):  
Climate Change ◽  
Foraging Behavior ◽  
Dynamic Models ◽  
Species Coexistence ◽  
Prey Availability ◽  
Stomach Contents ◽  
Optimal Foraging Theory ◽  
Trophic Niche ◽  
Feeding Strategies ◽  
Adaptive Foraging

Abstract Adaptative foraging behavior should promote species coexistence and biodiversity under climate change as predators are expected to maximize their energy intake, according to principles of optimal foraging theory. We test these assumptions using a dataset comprising 22,185 stomach contents of fish species across functional groups, feeding strategies, and prey availability in the environment over 12 years. Our results show that foraging shifts from trait-dependent prey selectivity to density dependence in warmer and more productive environments. This behavioral change leads to lower consumption efficiency as species shift away from their optimal trophic niche, undermining species persistence and biodiversity. By integrating this adaptive foraging behavior into dynamic models, our study reveals higher risk profiles for ecosystems under global warming.

Sound and movement data from two overlapping populations of killer whales reveal noise effects on foraging behavior

2021 ◽  
Vol 150 (4) ◽  
pp. A250-A250
Author(s):  
Jennifer B. Tennessen ◽  
Marla M. Holt ◽  
Brianna Wright ◽  
M. Bradley M. Hanson ◽  
Candice Emmons ◽  
...  
Keyword(s):  
Foraging Behavior ◽  
Killer Whales ◽  
Noise Effects ◽  
Movement Data
Sign in / Sign up

Export Citation Format

Share Document