At-sea seabird censuses. Data on the species encountered (including marine mammals), their abundance, distribution and behavior. Data collected aboard cruises off the coast of the Western Antarctic Penninsula, 1993 - 2018.

The objectives of the LTER seabird component during the 92-93 season cruises were similar. These objectives included 1) determining the pelagic abundance and distribution of Adelie Penguins, 2) examining how the physical and biological characteristics of the marine environment influence these parame...

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Main Authors: LTER, Palmer Station Antarctica, Fraser, William
Format: Dataset
Language:English
Published: Environmental Data Initiative 2020
Subjects:
Online Access:https://dx.doi.org/10.6073/pasta/daa3753c4d20470b0ff1a0caa9dc19e2
https://portal.edirepository.org/nis/mapbrowse?packageid=knb-lter-pal.95.5
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spelling ftdatacite:10.6073/pasta/daa3753c4d20470b0ff1a0caa9dc19e2 2023-05-15T14:00:39+02:00 At-sea seabird censuses. Data on the species encountered (including marine mammals), their abundance, distribution and behavior. Data collected aboard cruises off the coast of the Western Antarctic Penninsula, 1993 - 2018. LTER, Palmer Station Antarctica Fraser, William 2020 https://dx.doi.org/10.6073/pasta/daa3753c4d20470b0ff1a0caa9dc19e2 https://portal.edirepository.org/nis/mapbrowse?packageid=knb-lter-pal.95.5 en eng Environmental Data Initiative dataset Dataset dataPackage 2020 ftdatacite https://doi.org/10.6073/pasta/daa3753c4d20470b0ff1a0caa9dc19e2 2021-11-05T12:55:41Z The objectives of the LTER seabird component during the 92-93 season cruises were similar. These objectives included 1) determining the pelagic abundance and distribution of Adelie Penguins, 2) examining how the physical and biological characteristics of the marine environment influence these parameters and, 3) using these data to identify foraging areas that may be important to Adelie populations being studied as part of land-based work at Palmer Station. Secondary objectives included documenting the abundance and distribution of other seabirds and marine mammals within the LTER study area. The focus of the January cruise was the nearshore foraging habitat, which required sampling at smaller scales. All seabird censuses were thus conducted within approximately 100 kms of Palmer Station while traversing a sampling grid with stations at 10km intervals. The first two days (18-20 January) of this cruise were spent covering the selected grid as rapidly as possible resulting in 45 transects spaced at 45-60 minute intervals. There were no stops at the 10km stations during this Fast Grid phase. Upon completion of the Fast Grid, a force 12 gale suspended data collection for 24 hours. From January 22-25 the grid direction was reversed and the grid repeated. During this Slow Grid phase, 2-M net tows were done at 10km intervals and BOPS and 1-M and 2-M net tows every 20 km. All seabird censuses during the cruise were done using the procedures outlined in the previous paragraph. Seventy-two 30-minute transects and 15 station censuses were completed during the January cruise. Athough seabirds were widely distributed throughout the study area, the highest densities and greatest biomass occurred consistently within 2-5 km of Anvers Island and several major island groups to the south and west near the Antarctic Peninsula. Adelie Penguins were the dominant component of this seabird assemblage in terms of both abundance and biomass. South Polar Skuas ranked second and Black-browed Albatross third, with the latter becoming the dominant assemblage member at distances greater than 10km from land. Although South Polar Skuas had been expected to occur in more pelagic habitats, few were censused at distances greater than 10km from land. The presence of both skuas and penguins so close to land was unexpected. The most important variable accounting for variation in the distribution and abundance of seabirds appeared to be the location of the 200m contour, which throughout the study area occurred 2-5km from the adjoining land masses. Approximately 65% of the seabirds censused during this cruise (85% of the biomass) occurred in association with this contour. Dataset Antarc* Antarctic Antarctic Peninsula Anvers Island South Polar Skuas DataCite Metadata Store (German National Library of Science and Technology) Antarctic Antarctic Peninsula Anvers ENVELOPE(-63.500,-63.500,-64.600,-64.600) Anvers Island ENVELOPE(-63.500,-63.500,-64.600,-64.600) Major Island ENVELOPE(-96.292,-96.292,55.728,55.728) Palmer Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) Palmer-Station ENVELOPE(-64.050,-64.050,-64.770,-64.770) The Antarctic
institution Open Polar
collection DataCite Metadata Store (German National Library of Science and Technology)
op_collection_id ftdatacite
language English
description The objectives of the LTER seabird component during the 92-93 season cruises were similar. These objectives included 1) determining the pelagic abundance and distribution of Adelie Penguins, 2) examining how the physical and biological characteristics of the marine environment influence these parameters and, 3) using these data to identify foraging areas that may be important to Adelie populations being studied as part of land-based work at Palmer Station. Secondary objectives included documenting the abundance and distribution of other seabirds and marine mammals within the LTER study area. The focus of the January cruise was the nearshore foraging habitat, which required sampling at smaller scales. All seabird censuses were thus conducted within approximately 100 kms of Palmer Station while traversing a sampling grid with stations at 10km intervals. The first two days (18-20 January) of this cruise were spent covering the selected grid as rapidly as possible resulting in 45 transects spaced at 45-60 minute intervals. There were no stops at the 10km stations during this Fast Grid phase. Upon completion of the Fast Grid, a force 12 gale suspended data collection for 24 hours. From January 22-25 the grid direction was reversed and the grid repeated. During this Slow Grid phase, 2-M net tows were done at 10km intervals and BOPS and 1-M and 2-M net tows every 20 km. All seabird censuses during the cruise were done using the procedures outlined in the previous paragraph. Seventy-two 30-minute transects and 15 station censuses were completed during the January cruise. Athough seabirds were widely distributed throughout the study area, the highest densities and greatest biomass occurred consistently within 2-5 km of Anvers Island and several major island groups to the south and west near the Antarctic Peninsula. Adelie Penguins were the dominant component of this seabird assemblage in terms of both abundance and biomass. South Polar Skuas ranked second and Black-browed Albatross third, with the latter becoming the dominant assemblage member at distances greater than 10km from land. Although South Polar Skuas had been expected to occur in more pelagic habitats, few were censused at distances greater than 10km from land. The presence of both skuas and penguins so close to land was unexpected. The most important variable accounting for variation in the distribution and abundance of seabirds appeared to be the location of the 200m contour, which throughout the study area occurred 2-5km from the adjoining land masses. Approximately 65% of the seabirds censused during this cruise (85% of the biomass) occurred in association with this contour.
format Dataset
author LTER, Palmer Station Antarctica
Fraser, William
spellingShingle LTER, Palmer Station Antarctica
Fraser, William
At-sea seabird censuses. Data on the species encountered (including marine mammals), their abundance, distribution and behavior. Data collected aboard cruises off the coast of the Western Antarctic Penninsula, 1993 - 2018.
author_facet LTER, Palmer Station Antarctica
Fraser, William
author_sort LTER, Palmer Station Antarctica
title At-sea seabird censuses. Data on the species encountered (including marine mammals), their abundance, distribution and behavior. Data collected aboard cruises off the coast of the Western Antarctic Penninsula, 1993 - 2018.
title_short At-sea seabird censuses. Data on the species encountered (including marine mammals), their abundance, distribution and behavior. Data collected aboard cruises off the coast of the Western Antarctic Penninsula, 1993 - 2018.
title_full At-sea seabird censuses. Data on the species encountered (including marine mammals), their abundance, distribution and behavior. Data collected aboard cruises off the coast of the Western Antarctic Penninsula, 1993 - 2018.
title_fullStr At-sea seabird censuses. Data on the species encountered (including marine mammals), their abundance, distribution and behavior. Data collected aboard cruises off the coast of the Western Antarctic Penninsula, 1993 - 2018.
title_full_unstemmed At-sea seabird censuses. Data on the species encountered (including marine mammals), their abundance, distribution and behavior. Data collected aboard cruises off the coast of the Western Antarctic Penninsula, 1993 - 2018.
title_sort at-sea seabird censuses. data on the species encountered (including marine mammals), their abundance, distribution and behavior. data collected aboard cruises off the coast of the western antarctic penninsula, 1993 - 2018.
publisher Environmental Data Initiative
publishDate 2020
url https://dx.doi.org/10.6073/pasta/daa3753c4d20470b0ff1a0caa9dc19e2
https://portal.edirepository.org/nis/mapbrowse?packageid=knb-lter-pal.95.5
long_lat ENVELOPE(-63.500,-63.500,-64.600,-64.600)
ENVELOPE(-63.500,-63.500,-64.600,-64.600)
ENVELOPE(-96.292,-96.292,55.728,55.728)
ENVELOPE(-64.050,-64.050,-64.770,-64.770)
ENVELOPE(-64.050,-64.050,-64.770,-64.770)
geographic Antarctic
Antarctic Peninsula
Anvers
Anvers Island
Major Island
Palmer Station
Palmer-Station
The Antarctic
geographic_facet Antarctic
Antarctic Peninsula
Anvers
Anvers Island
Major Island
Palmer Station
Palmer-Station
The Antarctic
genre Antarc*
Antarctic
Antarctic Peninsula
Anvers Island
South Polar Skuas
genre_facet Antarc*
Antarctic
Antarctic Peninsula
Anvers Island
South Polar Skuas
op_doi https://doi.org/10.6073/pasta/daa3753c4d20470b0ff1a0caa9dc19e2
_version_ 1766269892006248448