Lagrangian Fronts and Coherent Structures Favorable for Fishery and Foraging Strategy of Top Marine Predators

2017 ◽  
pp. 223-256 ◽  
Author(s):  
Sergey V. Prants ◽  
Michael Yu. Uleysky ◽  
Maxim V. Budyansky
Keyword(s):  
Coherent Structures ◽  
Foraging Strategy ◽  
Marine Predators

scholarly journals Top marine predators track Lagrangian coherent structures

2009 ◽  
Vol 106 (20) ◽  
pp. 8245-8250 ◽  
Author(s):  
E. Tew Kai ◽  
V. Rossi ◽  
J. Sudre ◽  
H. Weimerskirch ◽  
C. Lopez ◽  
...  
Keyword(s):  
Coherent Structures ◽  
Lagrangian Coherent Structures ◽  
Marine Predators

Diving plasticity in the ancestral range of the yellow-eyed penguin Megadyptes antipodes, an endangered marine predator

2020 ◽  
Vol 648 ◽  
pp. 191-205
Author(s):  
CG Muller ◽  
BL Chilvers ◽  
RK French ◽  
PF Battley
Keyword(s):  
New Zealand ◽  
Breeding Success ◽  
Success Factors ◽  
Foraging Behaviour ◽  
Prey Availability ◽  
Population Decline ◽  
Foraging Strategy ◽  
Diving Behaviour ◽  
Marine Predator ◽  
Marine Predators

In long-lived marine predators such as penguins, foraging behaviour is related to breeding success. Yellow-eyed penguins Megadyptes antipodes are thought to be predominantly benthic foragers around mainland New Zealand, with previous dive studies showing little variation in diving behaviour and minimal change by year or breeding status. This apparent absence of foraging flexibility may be linked to local prey availability and therefore also to foraging success, factors believed to contribute to the current population decline. Here, we undertook the first detailed study of yellow-eyed penguin diving and foraging behaviour in the subantarctic Auckland Islands, part of the original ancestral range of the species that colonised mainland New Zealand. We collected dive logs from 134 foraging trips made by 73 breeders from Enderby Island, Auckland Islands, in the New Zealand subantarctic. Pelagic dives and foraging trips were recorded in the subantarctic population—a foraging strategy not previously published in dive studies on this species. Changes between benthic and pelagic foraging were recorded for individuals within foraging trips, within a breeding season, and between years. Differences in diving behaviour between the subantarctic and that reported for mainland New Zealand are likely influenced by local bathymetry and environmental conditions, and prey availability. However, the subantarctic population shows a greater use of pelagic foraging not evident in the northern population, even in areas that have a similar depth to some mainland foraging areas. This observed foraging flexibility may have implications for breeding success and potentially the long-term population trends of these 2 genetically similar populations.

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

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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