USAP-DC

Abstract

The Ross Sea is believed to contributes a huge portion (~1/3) of the primary productivity of the Southern Ocean and is home to a similar large portion of the top predators (e.g. 38% of Adelie, 28% of Emperor penguins) of the Antarctic sea ice ecosystem. The trophic pathways in this system are complex in both space and time. One scenario for the Ross Sea ecosystem is that diatoms are grazed by krill, which are in turn the preferred food of fish, penguins and other predators. Phaeocystis colonies, on the other hand lead to grazing by pteropods and other organisms that are a non-favoured food source for top predators. Remotely sensed chlorophyll, indicating all phytoplankton, is then suggested to be a relatively poor predictor of penguin foraging efforts. This is also consistent with notion that algal species composition is very important to penguin grazing pressure, mediated by krill, and perhaps resulting in selective depletion.

This collaborative research sets out to use an autonomous glider, equipped with a range of sensors, and informed by satellite chlorophyll imagery to be combined with 3-dimenisonal active penguin tracking to their preferred foraging sites. The effect of localized grazing pressure of krill on the appearance and disappearance of algal blooms will also be followed. Overall the objective of the research is to reconcile and explain several years of the study of the foraging habits and strategies of (top predator) penguins at the Cape Crozier site (Ross Island), with the dynamics of krill and their supporting algal food webs. The use of a glider to answer a primarily ecological questions is subject to moderate to high risk, and is potentially transformative.

Person	Role
Smith, Walker	Investigator
Ballard, Grant	Investigator

Antarctic Organisms and Ecosystems	Award # 1142174
Antarctic Organisms and Ecosystems	Award # 1142074

NSF-ANT11-42174_1
NSF-ANT-1142074-penguins_1.0

None in the Database

Repository	Title (link)	Format(s)	Status
CADC	Access to data	None	exist
BCO-DMO	Glider data from the southern Ross Sea collected from the iRobot Seaglider during the RVIB Nathaniel B. Palmer (AUV-SG-503-2012, NBP1210) cruises in 2012 (Penguin Glider project)	None	exist
Project website	Penguin Science file sharing site	None	exist
USAP-DC	Experimental analyses of phytoplankton temperature response	None	exist

1. Jones, R. M., & Smith, W. O. (2017). The influence of short-term events on the hydrographic and biological structure of the southwestern Ross Sea. Journal of Marine Systems, 166, 184–195. (doi:10.1016/j.jmarsys.2016.09.006)