scholarly journals Methods for detecting and quantifying individual specialisation in movement and foraging strategies of marine predators

2017 ◽  
Vol 578 ◽  
pp. 151-166 ◽  
Author(s):  
APB Carneiro ◽  
AS Bonnet-Lebrun ◽  
A Manica ◽  
IJ Staniland ◽  
RA Phillips
Keyword(s):  
Foraging Strategies ◽  
Marine Predators ◽  
Individual Specialisation

scholarly journals Larger foraging range but similar habitat selection in non-breeding versus breeding sub-Antarctic penguins

2011 ◽  
Vol 23 (2) ◽  
pp. 117-126 ◽  
Author(s):  
Jean-Baptiste Thiebot ◽  
Amélie Lescroël ◽  
David Pinaud ◽  
Philip N. Trathan ◽  
Charles-André Bost
Keyword(s):  
Habitat Selection ◽  
Foraging Strategies ◽  
Breeding Period ◽  
Mahalanobis Distances ◽  
Juvenile Dispersal ◽  
Marine Predators ◽  
Eudyptes Chrysolophus ◽  
Breeding Grounds ◽  
Suitability Maps ◽  
Suitable Habitats

AbstractFor land-breeding marine organisms such as seabirds, knowledge about their habitat use has mainly been gained through studies of breeding individuals that are constrained to return frequently to their breeding grounds. In this study we set out to measure whether: a) habitat selection in the non-breeding period predicts habitat selection in the breeding period, and b) whether breeding individuals concentrated their activity on the closest suitable habitats. MacaroniEudyptes chrysolophusand gentooPygoscelis papuapenguins, two marine predators with contrasting foraging strategies, were tracked from the Iles Kerguelen and their habitat selection investigated through Mahalanobis distances factorial analysis. This study presents the first data about gentoo penguins’ juvenile dispersal. For both species, results showed 6.9 times larger maximum ranges and up to 12.2 times greater distances travelled during the non-breeding period. Habitat suitability maps suggested both species made similar environmental selections whatever the period. Macaroni penguins targeted pelagic areas beyond the shelf break while gentoo penguins always remained over the shelf. We consider the ecological significance of larger scale movements made outside the breeding period and suggest that this non-breeding period is of particular interest when attempting to understand an animal's habitat selection.

scholarly journals Activity seascapes highlight central place foraging strategies in marine predators that never stop swimming

2018 ◽  
Vol 6 (1) ◽  
Author(s):  
Yannis P. Papastamatiou ◽  
Yuuki Y. Watanabe ◽  
Urška Demšar ◽  
Vianey Leos-Barajas ◽  
Darcy Bradley ◽  
...  
Keyword(s):  
Central Place ◽  
Foraging Strategies ◽  
Central Place Foraging ◽  
Marine Predators

scholarly journals Prey Patch Patterns Predict Habitat Use by Top Marine Predators with Diverse Foraging Strategies

PLoS ONE ◽  
2013 ◽  
Vol 8 (1) ◽  
pp. e53348 ◽  
Author(s):  
Kelly J. Benoit-Bird ◽  
Brian C. Battaile ◽  
Scott A. Heppell ◽  
Brian Hoover ◽  
David Irons ◽  
...  
Keyword(s):  
Habitat Use ◽  
Foraging Strategies ◽  
Prey Patch ◽  
Marine Predators

Population organisation in reef sharks: new variations in coastal habitat use by mobile marine predators

2016 ◽  
Vol 544 ◽  
pp. 197-211 ◽  
Author(s):  
A Chin ◽  
MR Heupel ◽  
CA Simpfendorfer ◽  
AJ Tobin
Keyword(s):  
Habitat Use ◽  
Coastal Habitat ◽  
Marine Predators ◽  
Reef Sharks

Influence of shelf oceanographic variability on alternate foraging strategies in long-nosed fur seals

2019 ◽  
Vol 615 ◽  
pp. 189-204 ◽  
Author(s):  
D Foo ◽  
C McMahon ◽  
M Hindell ◽  
S Goldsworthy ◽  
F Bailleul
Keyword(s):  
Foraging Strategies ◽  
Fur Seals

Spatiotemporal distribution of foraging in a marine predator: behavioural drivers of hotspot formation

2020 ◽  
Vol 635 ◽  
pp. 187-202
Author(s):  
T Brough ◽  
W Rayment ◽  
E Slooten ◽  
S Dawson
Keyword(s):  
Time Of Day ◽  
Spatiotemporal Distribution ◽  
Temporal Effects ◽  
Marine Predator ◽  
Marine Predators ◽  
Additive Mixed Models ◽  
Density Analysis ◽  
The Times ◽  
Passive Acoustic ◽  
Spatial Locations

Many species of marine predators display defined hotspots in their distribution, although the reasons why this happens are not well understood in some species. Understanding whether hotspots are used for certain behaviours provides insights into the importance of these areas for the predators’ ecology and population viability. In this study, we investigated the spatiotemporal distribution of foraging behaviour in Hector’s dolphin Cephalorhynchus hectori, a small, endangered species from New Zealand. Passive acoustic monitoring of foraging ‘buzzes’ was carried out at 4 hotspots and 6 lower-use, ‘reference areas’, chosen randomly based on a previous density analysis of visual sightings. The distribution of buzzes was modelled among spatial locations and on 3 temporal scales (season, time of day, tidal state) with generalised additive mixed models using 82000 h of monitoring data. Foraging rates were significantly influenced by all 3 temporal effects, with substantial variation in the importance and nature of each effect among locations. The complexity of the temporal effects on foraging is likely due to the patchy nature of prey distributions and shows how foraging is highly variable at fine scales. Foraging rates were highest at the hotspots, suggesting that feeding opportunities shape fine-scale distribution in Hector’s dolphin. Foraging can be disrupted by anthropogenic influences. Thus, information from this study can be used to manage threats to this vital behaviour in the locations and at the times where it is most prevalent.

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