Title Life under Antarctic pack ice; a krill perspective
Author Quetin, L.B.; Ross, R.M.
Author Affil Quetin, L.B., University of California at Santa Barbara, Marine Science Institute, Santa Barbara, CA
Source p.285-298, ; Smithsonian at the poles, Washington, DC, May 3-4, 2007, edited by I. Krupnik, M.A. Lang and S.E. Miller. Publisher: Smithsonian Institution Scholarly Press, Washington, DC, United States. ISBN: 978-0-9788460-1-50-9788460-1- X
Publication Date 2009
Notes In English. 109 refs. Ant. Acc. No: 86094. CRREL Acc. No: 63004407
Index Terms biogeography; biomass; ecology; ecosystems; ice; ice cover; pack ice; Antarctica--Antarctic Peninsula; Southern Ocean; Antarctic Peninsula; Antarctica; Arthropoda; Crustacea; habitat; ice cover distribution; International Polar Year 2007- 08; Invertebrata; IPY 2007-08 Research Publications; Mandibulata; sea ice
Abstract The life cycle of the Antarctic krill, Euphausia superba, intersects in space and time with the expansion and contraction of annual pack ice. Consequently, the circumpolar distribution of krill has often been defined as generally limited to an area bounded by the maximum extent of pack ice. Pack ice has both direct and indirect effects on the life cycle of krill. During the austral winter, larval krill are found in direct association with the underside of the ice and feed on the small plants and animals that constitute the sea ice microbial community, a food source relatively abundant in winter compared to food sources in the water column. Indirectly, melting pack ice in late winter or early spring stabilizes the water column and promotes growth of the preferred food of krill, which, in turn, likely provides the fuel for egg production during the summer months. Thus, the warming trend west of the Antarctic Peninsula with attendant changes in both the timing and duration of winter ice has implications for the population dynamics of krill. Given the complexity of the habitat-life cycle interaction, research on Antarctic krill involves diverse sampling tools that are dependent on the size and habitat of krill during a particular stage of their life cycle, and the nature of the study itself. In particular, and pertinent to the topic of diving in polar research, the research has been greatly enhanced by diving techniques developed to allow both observation and sampling of krill in their winter pack-ice habitat.
URL http://hdl.handle.net/10088/6822
Publication Type monograph
Record ID 292162