scholarly journals Sexual segregation in a wide-ranging marine predator is a consequence of habitat selection

2015 ◽  
Vol 518 ◽  
pp. 1-12 ◽  
Author(s):  
IR Cleasby ◽  
ED Wakefield ◽  
TW Bodey ◽  
RD Davies ◽  
SC Patrick ◽  
...  
Keyword(s):  
Habitat Selection ◽  
Sexual Segregation ◽  
Marine Predator

Is there sexual segregation in habitat selection by Black-browed Albatrosses wintering in the south-west Atlantic?

2021 ◽  
pp. 1-11
Author(s):  
Jesica Andrea Paz ◽  
Juan Pablo Seco Pon ◽  
Lucas Krüger ◽  
Marco Favero ◽  
Sofía Copello
Keyword(s):  
Habitat Selection ◽  
Sexual Segregation ◽  
The South ◽  
South West

Sexual segregation in habitat use is smaller than expected in a highly dimorphic marine predator, the southern sea lion

2016 ◽  
Vol 554 ◽  
pp. 201-211 ◽  
Author(s):  
AMM Baylis ◽  
RA Orben ◽  
DP Costa ◽  
JPY Arnould ◽  
IJ Staniland
Keyword(s):  
Habitat Use ◽  
Sexual Segregation ◽  
Sea Lion ◽  
Marine Predator

scholarly journals Encounter success of free-ranging marine predator movements across a dynamic prey landscape

2006 ◽  
Vol 273 (1591) ◽  
pp. 1195-1201 ◽  
Author(s):  
David W Sims ◽  
Matthew J Witt ◽  
Anthony J Richardson ◽  
Emily J Southall ◽  
Julian D Metcalfe
Keyword(s):  
Random Walk ◽  
Habitat Selection ◽  
Multiple Scales ◽  
Zooplankton Biomass ◽  
Marine Predator ◽  
North East ◽  
The North ◽  
Top Predators ◽  
Large Predators ◽  
Free Ranging

Movements of wide-ranging top predators can now be studied effectively using satellite and archival telemetry. However, the motivations underlying movements remain difficult to determine because trajectories are seldom related to key biological gradients, such as changing prey distributions. Here, we use a dynamic prey landscape of zooplankton biomass in the north-east Atlantic Ocean to examine active habitat selection in the plankton-feeding basking shark Cetorhinus maximus . The relative success of shark searches across this landscape was examined by comparing prey biomass encountered by sharks with encounters by random-walk simulations of ‘model’ sharks. Movements of transmitter-tagged sharks monitored for 964 days (16 754 km estimated minimum distance) were concentrated on the European continental shelf in areas characterized by high seasonal productivity and complex prey distributions. We show movements by adult and sub-adult sharks yielded consistently higher prey encounter rates than 90% of random-walk simulations. Behavioural patterns were consistent with basking sharks using search tactics structured across multiple scales to exploit the richest prey areas available in preferred habitats. Simple behavioural rules based on learned responses to previously encountered prey distributions may explain the high performances. This study highlights how dynamic prey landscapes enable active habitat selection in large predators to be investigated from a trophic perspective, an approach that may inform conservation by identifying critical habitat of vulnerable species.

scholarly journals Sexual segregation in a highly pagophilic and sexually dimorphic marine predator

2021 ◽  
Vol 1 ◽  
Author(s):  
Christophe Barbraud ◽  
Karine Delord ◽  
Akiko Kato ◽  
Paco Bustamante ◽  
Yves Cherel
Keyword(s):  
Sexual Segregation ◽  
Sexually Dimorphic ◽  
Marine Predator

Does food-searching ability determine habitat selection? Foraging in sand of three species of gerbilline rodents

Ecography ◽  
2000 ◽  
Vol 23 (1) ◽  
pp. 122-129 ◽  
Author(s):  
Boris R. Krasnov ◽  
Georgy I. Shenbrot ◽  
Luis E. Rios ◽  
Maria E. Lizurume
Keyword(s):  
Habitat Selection ◽  
Searching Ability

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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