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Janet T. Clarke
Leidos
33Publications
9H-index
357Citations
Publications 33
Newest
#1Megan C. Ferguson (NMFS: National Marine Fisheries Service)H-Index: 4
#2R.P. Angliss (NMFS: National Marine Fisheries Service)H-Index: 1
Last.Janet T. Clarke (Leidos)H-Index: 9
view all 8 authors...
Manned aerial surveys have been used successfully for decades to collect data to infer cetacean distribution, density (number of whales/km2), and abundance. Unmanned aircraft systems (UAS) have potential to augment or replace some manned aerial surveys for cetaceans. We conducted a three-way comparison among visual observations made by marine mammal observers aboard a Turbo Commander aircraft; imagery autonomously collected by a Nikon D810 camera system mounted to a belly port on the Turbo Comma...
6 CitationsSource
#1Janet T. ClarkeH-Index: 9
#2Megan C. FergusonH-Index: 12
Last.Amelia A. BrowerH-Index: 5
view all 4 authors...
We analyzed data from line-transect aerial surveys for marine mammals conducted in the western Beaufort Sea (shore to 72˚ N, 140˚–157˚ W) from July to October of 2009–16 to investigate the distribution, behaviors, sighting rates, and habitat use preferences of bowhead and beluga whales. The habitat use data allowed for direct comparison with data collected in the same area from 1982 to 1991. Both species are ice-adapted, migrating through leads in sea ice in spring, and are seasonal inhabitants ...
1 CitationsSource
#1Amelia A. Brower (UW: University of Washington)H-Index: 1
#2Janet T. Clarke (Leidos)H-Index: 9
Last.Megan C. FergusonH-Index: 12
view all 3 authors...
Cetacean occurrence in the Chukchi Sea is seasonal and primarily driven by annual sea ice retreat and prey occurrence in spring through fall. Humpback whales (Megaptera novaeangliae), fin whales (Balaenoptera physalus), and minke whales (Balaenoptera acutorostrata), although often found in polar waters elsewhere, are not common in the eastern Chukchi Sea, and here are referred to as “subArctic” species. Increasing numbers of these subArctic cetacean species were documented during aerial surveys ...
3 CitationsSource
#1Amy L. WilloughbyH-Index: 1
#2Megan C. FergusonH-Index: 12
Last.Amelia A. BrowerH-Index: 5
view all 4 authors...
Source
#1Amelia A. Brower (Joint Institute for the Study of the Atmosphere and Ocean)H-Index: 5
#2Megan C. Ferguson (NMFS: National Marine Fisheries Service)H-Index: 4
Last.Janet T. Clarke (Leidos)H-Index: 9
view all 5 authors...
Abstract The shallow continental shelf waters of the Bering and Chukchi seas are the northernmost foraging grounds of North Pacific gray whales (Eschrichtius robustus). Benthic amphipods are considered the primary prey of gray whales in these waters, although no comprehensive quantitative analysis has been performed to support this assumption. Gray whale relative abundance, distribution, and behavior in the northeastern Chukchi Sea (69°–72°N, 155–169°W) were documented during aerial surveys in J...
9 CitationsSource
#1Matthew L. Druckenmiller (CU: University of Colorado Boulder)H-Index: 3
#2John J. Citta (Alaska Department of Fish and Game)H-Index: 10
Last.Lori T. Quakenbush (Alaska Department of Fish and Game)H-Index: 17
view all 6 authors...
Abstract The range of the Bering-Chukchi-Beaufort (BCB) population of bowhead whales (Balaena mysticetus) extends across the seasonally ice-covered waters of the Pacific Arctic region. The majority of whales summer in the eastern Beaufort Sea and winter in the Bering Sea, migrating across the Chukchi Sea in fall and spring. As arctic sea-ice extent rapidly diminishes, the increasing length and variability of the open water season is changing bowhead habitat substantially, with many areas now reg...
2 CitationsSource
#1Jordann K. Young (University of Texas at Austin)H-Index: 1
#2Bryan Andrew Black (University of Texas at Austin)H-Index: 28
Last.Kenneth H. Dunton (University of Texas at Austin)H-Index: 40
view all 5 authors...
Abstract The northeastern Chukchi Sea is a shallow subarctic shelf ecosystem that supports a substantial benthic infaunal community of which bivalves are a major component. We assessed the patterns in population abundance, biomass, and caloric content of ten dominant bivalve taxa in relation to the distribution of the upper trophic level consumer Pacific walrus (Odobenus rosmarus divergens). Bivalves were collected over four cruises in the northeastern Chukchi Sea (2009, 2010, 2012, 2013). Our s...
4 CitationsSource
#1Lloyd F. LowryH-Index: 22
Last.Robert SuydamH-Index: 19
view all 5 authors...
The eastern Chukchi Sea (ECS) stock of beluga whales is one of three stocks in western Alaska that are co-managed by the National Marine Fisheries Service and the Alaska Beluga Whale Committee. Abundance of this stock was estimated as 3710 in 1991 from incomplete data. Analysis of data from satellite-linked time-depth recorders (SDRs) attached to belugas in summer concentration areas of the ECS and Beaufort Sea (BS) stocks provided an overview of beluga distribution and movements and allowed the...
2 CitationsSource
#1Janet T. ClarkeH-Index: 9
#2Amelia A. BrowerH-Index: 5
Last.Amy L. WilloughbyH-Index: 1
view all 4 authors...
Source
#1Kathleen M. Stafford (UW: University of Washington)H-Index: 26
#2Megan C. FergusonH-Index: 12
Last.Robert S. SuydamH-Index: 9
view all 10 authors...
Abstract The seasonal and geographic patterns in the distribution, residency, and density of two populations (Chukchi and Beaufort) of beluga whales ( Delphinapterus leucas ) were examined using data from aerial surveys, passive acoustic recordings, and satellite telemetry to better understand this arctic species in the oceanographically complex and changing western Beaufort Sea. An aerial survey data-based model of beluga density highlights the Beaufort Sea slope as important habitat for beluga...
6 CitationsSource
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