[MARMAM] New publication: Foraging movement behavior of humpback whales in Antarctica
corrie.curtice at duke.edu
Tue Jun 2 07:13:12 PDT 2015
On behalf of my co-authors, I'm please to announce a new open access publication on foraging movements of humpback whales in Antarctica.
Curtice, C., Johnston, D. W., Ducklow, H., Gales, N., Halpin, P. H., Friedlaender, A. S. (2015) Modeling the spatial and temporal dynamics of foraging movements of humpback whales (Megaptera novaeangliae) in the Western Antarctic Peninsula. Movement Ecology 3:13. doi: 10.1186/s40462-015-0041-x
Background: A population of humpback whales (Megaptera novaeangliae) spends the austral summer feeding on Antarctic krill (Euphausia superba) along the Western Antarctic Peninsula (WAP). These whales acquire their annual energetic needs during an episodic feeding season in high latitude waters that must sustain long-distance migration and fasting on low-latitude breeding grounds. Antarctic krill are broadly distributed along the continental shelf and nearshore waters during the spring and early summer, and move closer to land during late summer and fall, where they overwinter under the protective and nutritional cover of sea ice. We apply a novel space-time utilization distribution method to test the hypothesis that humpback whale distribution reflects that of krill: spread broadly during summer with increasing proximity to shore and associated embayments during fall.
Results: Humpback whales instrumented with satellite-linked positional telemetry tags (n=5), show decreased home range size, amount of area used, and increased proximity to shore over the foraging season.
Conclusions: This study applies a new method to model the movements of humpback whales in the WAP region throughout the feeding season, and presents a baseline for future observations of the seasonal changes in the movement patterns and foraging behavior of humpback whales (one of several krill-predators affected by climate-driven changes) in the WAP marine ecosystem. As the WAP continues to warm, it is prudent to understand the ecological relationships between sea-ice dependent krill and krill predators, as well as the interactions among recovering populations of krill predators that may be forced into competition for a shared food resource.
The publication can be accessed online for free at http://www.movementecologyjournal.com/content/3/1/13. Questions and comments may be directed to Corrie Curtice: corrie.curtice at duke.edu<mailto:corrie.curtice at duke.edu>.
Marine Geospatial Ecology Lab
Nicholas School of the Environment, Duke University
em: corrie.curtice at duke.edu<mailto:corrie.curtice at duke.edu>
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