In-situ (video) observations on the distribution and behavior of amphipods and Arctic cod (Boreogadus saida) under the sea ice of the High Arctic Canada Basin, August 2002Entry ID: ArcOD_2008I2
Abstract: The occurrence and behavior of sympagic amphipods and Arctic cod (Boreogadus saida) were studied in the High Arctic Canada Basin by diving under the ice at seven stations in summer 2002. The data set consists of 12 rows and two species. Still images of video-transects were used to obtain animal abundances and information on the structure of the ice environment. Mean amphipod abundances for the ... stations varied between 1 and 23 individuals m–2, with an increase towards the western part of the basin. The standard deviation within the 31–51 images analyzed per station was small (<1 individual m–2). Gammarus wilkitzkii was found in low abundances, often hiding in small ice gaps. Small amphipods (Onisimus spp., Apherusa glacialis, and juveniles of all species) tended to move freely along the bottom of the floes. B. saida occurred in narrow wedges of seawater along the edges of melting ice floes at three stations in water depths of 10–50 cm and was never found under the ice. The fish occurred in schools of 1–28 per wedge. Fish were inactive and did not escape the approaching diver. Resting in the wedges may be a strategy to reduce energetic requirements and avoid predators.
Purpose: To assess numbers and species of under-ice fauna
Data Set Citation
Dataset Originator/Creator: Rolf R. Gradinger, Bodil A. Bluhm
Dataset Title: In-situ (video) observations on the distribution and behavior of amphipods and Arctic cod (Boreogadus saida) under the sea ice of the High Arctic Canada Basin, August 2002
Dataset Series Name: Polar Biology
Dataset Release Date: 2004
Issue Identification: 27: 595-603
Data Presentation Form: documentOnline Resource: http://ak.aoos.org/ArcOD/data_table.php
This data set description is a member of a collection. The collection is described in
Start Date: 2002-08-20Stop Date: 2002-08-30
Quality ATTRIBUTE ACCURACY REPORT: Individual video frames at five second intervals were selected and analyzed Spatial accuracy unknown. Ask authors for details.
LOGICAL CONSISTENCY REPORT: The same procedures were used for all days; findings should be consistent.
Access Constraints None.
Use Constraints Although these data have been processed successfully on a computer system at the University of Alaska and ArcOD, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use ... with other data. It is strongly recommended that these data are directly acquired from a University of Alaska server, and not indirectly through other sources which may have changed the data in some way. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. The University of Alaska shall not be held liable for improper or incorrect use of the data described and/or contained herein.
Data Set Progress
Distribution Format: XLS
Phone: 1 907 474-7842
P.O.Box 757220 University of Alaska-Fairbanks
Province or State: Alaska
Postal Code: 99775-7220
Role: TECHNICAL CONTACT
Fax: +01-907 4746967
Email: fhuettmann at alaska.edu
419 Irving I, PO Box 757000
Province or State: AK
Postal Code: 99775-7000
Role: DIF AUTHOR
Email: alicia.m.aleman at nasa.gov
Goddard Space Flight Center Code 610.2
Province or State: MD
Postal Code: 20771
Creation and Review Dates
DIF Creation Date: 2009-03-27
Last DIF Revision Date: 2010-02-24