[Source_Name: Short_Name='RADIO TRANSMITTERS']
Duke Marine Lab Albatross Tagging, 1997-1999Entry ID: seamap74
Abstract: Four female and one male black-footed albatross (Phoebastria nigripes) were tracked using satellite telemetry during their post-breeding summer dispersal (July ? September, 1997?1999). The females were tracked using transmitters that operated continuously, and the male was tracked using a duty-cycled transmitter programmed to transmit on 7-day ON:OFF cycles.
Purpose: Albatross movements and foraging grounds during the post-breeding dispersal are poorly understood, despite their important conservation implications. We tracked four female black-footed albatross (Phoebastria nigripes) for 100 days during their summer (July-September, 1997-1999) post-breeding dispersal off California, and compared their movements to the distribution of fishing effort from the ... Japanese Eastern Pacific Ocean (EPO) longline fishery. The tracked birds foraged largely along the transition zone between the California Current and the Central Pacific Gyre, and spent 25, 24, and 51% of their time at sea within the 200-mile exclusive economic zones (EEZs) of the USA and Mexico, and the high seas (international waters) respectively. The satellite-tracked birds occupied subtropical waters (18-20°C) targeted by longline fisheries for tuna (Thunnus spp.) and broad-bill swordfish (Xiphias gladius), and ranged disproportionately farther during daylight hours, when tuna fisheries operate. The available data suggest that albatrosses overlap temporally and spatially with longline fisheries in the northeast Pacific Ocean. However, this research cannot directly evaluate whether black-footed albatross bycatch occurs in these fisheries. The coarse temporal (monthly) and spatial (1°x1°) resolution of the fisheries data, and the dynamic nature of the fishing effort inhibited a fine-scale analysis of albatross overlap with longline fisheries. While we documented substantial spatial overlap between albatross distributions and the Japanese EPO longline fishing effort during the 1980s, we found no co-occurrence during the 1990s. This study illustrates the value of satellite telemetry to assess national conservation responsibilities, and to identify potential interactions of protected species with fisheries not currently monitored by observer programs. Furthermore, our results underscore the need to exercise caution when interpreting satellite telemetry data for conservation purposes, because of the highly dynamic nature of pelagic fisheries.
SUPPLEMENTAL INFORMATION: These telemetry data were collected through the Argos system, using Telonics ST-10 transmitters (Telonics, Mesa, AZ) programmed to operate on a 90-second repetition rate. Bench-mark tests before transmitter deployment revealed the following median positional errors (in km) for different Argos location quality classes: 1.47 (lc0), 0.77 (lc1), 0.50 (lc2), 0.30 (lc3), 1.86 (lcA), 7.26 (lcB). Class B locations reached errors of up to 50 km. After removing low-quality class B locations the dataset contained 34.81% (lc0), 24.13% (lc1), 11.97% (lc2), 5.52% (lc3), 23.57% (lcA).
CURRENTNESS REFERENCE: ground condition
SPATIAL REFERENCE INFORMATION - GEODETIC MODEL
Horizontal Datum Name: D_WGS_1984
Ellipsoid Name: WGS_1984
Semi-major Axis: 6378137.000000
Denominator of Flattening Ratio: 298.257224
Data Set Citation
Dataset Originator/Creator: Duke University Marine Laboratory
Dataset Title: Duke Marine Lab Albatross Tagging, 1997-1999
Dataset Series Name: OBIS-SEAMAP
Dataset Release Date: 2004-03-11 13:40:24.665122-05
Dataset Release Place: http://seamap.env.duke.edu/
Dataset Publisher: OBIS-SEAMAP
Data Presentation Form: vector digital dataOnline Resource: http://www.nicholas.duke.edu/marinelab
This data set description is a member of a collection. The collection is described in
Start Date: 1997-07-10Stop Date: 1999-09-20
Latitude Resolution: 0.000167 Decimal degrees
Longitude Resolution: 0.000167 Decimal degrees
Horizontal Resolution Range: 1 meter - < 30 meters
Access Constraints ACCESS CONSTRAINTS: All limits on data accessibility pertaining to the OBIS-SEAMAP system apply to this database.
DISTRIBUTION LIABILITY: Not to hold OBIS-SEAMAP liable for errors in the data. While we have made every effort to ensure the quality of the database, we cannot guarantee the accuracy of these datasets. Also please refer to Use Constraints.
Use Constraints 1. Not to use data contained in OBIS-SEAMAP in any publication, product, or commercial application without prior written consent of the original data provider. 2. To cite both the data provider and OBIS-SEAMAP appropriately after approval of use is obtained. 3. Not to hold OBIS-SEAMAP liable for errors in the data. While we have made every effort to ensure the quality of the database, we cannot guarantee the accuracy of these datasets.
Data Set Progress
Distribution Format: Shapefile
Role: TECHNICAL CONTACT
Role: DIF AUTHOR
Email: efujioka at duke.edu
LSRC A321 Box 90328
Province or State: NC
Postal Code: 27708
Role: TECHNICAL CONTACT
Phone: (206) 221-4494
Email: khyrenba at u.washington.edu
Email: khyrenba at duke.edu
School of Aquatic and Fishery Sciences University of Washington Box 355020
Province or State: WA
Postal Code: 98195
Hyrenbach, K.D., and Dotson, R.C. 2003. Assessing the susceptibility of female Black-footed Albatross (Phoebastria nigripes) to longline fisheries during their post-breeding dispersal: An integrated approach. Biological Conservation 112: 391-404.
Hyrenbach, K.D., and Dotson, R.C. 2001. Post-breeding movements of a male Black-footed Albatross Phoebastria nigripes. Marine Ornithology, 29:23-26.
Creation and Review Dates
DIF Creation Date: 2008-01-10
Last DIF Revision Date: 2008-01-13