scholarly journals Late Summer Distribution of Cetaceans near Barrow, Alaska: Results from Aerial Surveys Conducted During the Bowhead Whale Feeding Ecology Study, 2007–11

2018 ◽  
Vol 79 (2) ◽  
pp. 1-22
Author(s):  
Kim E. W. Shelden ◽  
Julie A. Mocklin ◽  
Kimberly T. Goetz ◽  
David J. Rugh ◽  
Linda Vate Brattström ◽  
...  
Keyword(s):  
Feeding Ecology ◽  
Late Summer ◽  
Bowhead Whale ◽  
Aerial Surveys ◽  
Summer Distribution

scholarly journals Late summer distribution and abundance of ice-associated whales in the Norwegian High Arctic

2017 ◽  
Vol 32 ◽  
pp. 59-70 ◽  
Author(s):  
J Vacquié-Garcia ◽  
C Lydersen ◽  
TA Marques ◽  
J Aars ◽  
H Ahonen ◽  
...  
Keyword(s):  
Late Summer ◽  
High Arctic ◽  
Summer Distribution

Distribution of ringed seals in the southeastern Beaufort Sea during late summer

1992 ◽  
Vol 70 (5) ◽  
pp. 891-900 ◽  
Author(s):  
Lois A. Harwood ◽  
Ian Stirling
Keyword(s):  
Relative Abundance ◽  
Late Summer ◽  
Beaufort Sea ◽  
General Area ◽  
Phoca Hispida ◽  
Sea State ◽  
Ringed Seals ◽  
Aerial Surveys ◽  
Early Fall

The distribution and relative abundance of ringed seals (Phoca hispida) in the southeastern Beaufort Sea were examined through systematic aerial surveys in August–September of 1982 and 1984–1986. All data analyzed were collected by the same observer when sea state was ≤ 2 on the Beaufort Scale and when there was no forward glare. In late summer and early fall of 1982, 1984, and 1986, ringed seals occurred singly and in groups, to an observed maximum of 21 seals. Groups of seals were clumped into large areas of aggregation which appeared to persist for several weeks. Densities in aggregation areas ranged from 121 to 326 seals/100 km2, approximately 6–13 times greater than regional mean densities. The geographic extent of aggregation areas (350–2800 km2) and the numbers (1 in 1984, 2 in 1982, 3 in 1986) and locations of aggregations varied among years. Ringed seals tended to aggregate most frequently and in greatest numbers in waters north of the Tuktoyaktuk Peninsula, in the general area where the Cape Bathurst polynya occurs in winter. The relative abundance of ringed seals varied among the years of the study, reaching a maximum in 1982 (42.20 seals/100 km2), declining through 1984 (14.73/100 km2) and 1985 (7.92/100 km2), and increasing again in 1986 (19.35/100 km2).

Feeding ecology of migrating Red-necked Phalaropes (Phalaropus lobatus) in the Quoddy region, New Brunswick, Canada

1985 ◽  
Vol 63 (5) ◽  
pp. 1062-1067 ◽  
Author(s):  
F. M. Mercier ◽  
D. E. Gaskin
Keyword(s):  
New Brunswick ◽  
Feeding Ecology ◽  
Late Summer ◽  
Calanus Finmarchicus ◽  
Bay Of Fundy ◽  
Zooplankton Species ◽  
Breeding Grounds ◽  
Sinusoidal Pattern ◽  
Early Fall ◽  
Prey Items

During the summers of 1981 and 1982, feeding ecology was studied in migrating populations of Red-necked Phalaropes (Phalaropus lobatus) at their late summer – early fall staging ground in the Quoddy region of the Bay of Fundy (44°55′ – 45°00′ N, 66°54′–66°59′ W). This species was particularly abundant during August 1982 when 5 000 to 20 000/km2 were present in the study area at the peak of occupation. Calanus finmarchicus was both the major prey item and the most plentiful zooplankton species in the area in which the phalaropes fed (mean density, 117 individuals/m2). The birds were consistently found in sectors of the study area corresponding to maximum C. finmarchicus concentrations, made readily available at the surface by upwelling activity. The phalaropes fed almost exclusively on this species, which made up 88.6% of the total number of prey items found in the stomachs; smaller copepods, seeds, and insects made up the rest, with a size limit for ingested prey of 6 mm. The birds fed by pecking constantly at the surface of the water while swimming in a sinusoidal pattern; this differs markedly from the spinning behavior observed near the breeding grounds.

Satellite-monitored movements of radio-tagged bowhead whales in the Beaufort and Chukchi seas during the late-summer feeding season and fall migration

2000 ◽  
Vol 78 (7) ◽  
pp. 1168-1181 ◽  
Author(s):  
Bruce R Mate ◽  
Gregory K Krutzikowsky ◽  
Martha H Winsor
Keyword(s):  
Shallow Water ◽  
Late Summer ◽  
Open Water ◽  
Beaufort Sea ◽  
River Delta ◽  
Bowhead Whale ◽  
Balaena Mysticetus ◽  
Bowhead Whales ◽  
Russian Waters ◽  
Summer Feeding

From 30 August to 6 September 1992, we tagged 12 juvenile bowhead whales (Balaena mysticetus) with Argos satellite-monitored radio tags in the Canadian Beaufort Sea off the Mackenzie River Delta. Eight tags documented [Formula: see text]9820 km of movements between 392 locations during 111 whale-tracking days. The whales did not move in unison. Individual movements and average speeds (1.1-5.8 km/h) varied widely. One whale stayed in Mackenzie Bay for 23.5 d, while the rest stayed an average of only 2.4 d. The majority of locations for all whales were in shallow water: 65% at <50 m depth and 87% at <100 m depth. Seven whales went into water >100 m deep and four were in water >500 m deep. The whale with the longest record traveled [Formula: see text]3886 km to Siberia in 32.5 d, averaging 5.0 km/h. Its westerly route through the Beaufort and Chukchi seas was between 70° and 72°N and primarily in heavy ice ([Formula: see text]90% coverage), which was continuous west of 151°W. This whale's speed was faster, though not significantly, in heavy ice than in more open water. This is the first detailed documentation of the route and speed of a bowhead whale during its fall migration from Canadian to Russian waters.

scholarly journals Distribution and relative abundance of caribou in the Hudson Plains Ecozone of Ontario

Rangifer ◽  
2005 ◽  
Vol 25 (4) ◽  
pp. 105 ◽  
Author(s):  
Audrey J. Magoun ◽  
Kenneth F. Abraham ◽  
John E. Thompson ◽  
Justina C. Ray ◽  
Michel E. Gauthier ◽  
...  
Keyword(s):  
Relative Abundance ◽  
Rangifer Tarandus ◽  
Distribution Patterns ◽  
Hudson Bay ◽  
Research Projects ◽  
Sources Of Information ◽  
The Past ◽  
Aerial Surveys ◽  
Wintering Areas ◽  
Summer Distribution

To determine past distribution and relative abundance of caribou (Rangifer tarandus caribou) in the Hudson Plains Ecozone (HPE) of Ontario, we reviewed past HPE-wide winter systematic aerial surveys, partial winter systematic surveys, summer photographic surveys, incidental observations of caribou, and other sources of information from the period 1950—2003. We conducted new HPE-wide aerial surveys in February 2003 and 2004 to evaluate current distribution patterns. From this information, we defined 9 core wintering areas in the HPE and differentiated between 3 catego¬ries of relative abundance. Wintering areas for the January—March period have changed relatively little over the past 45 years. Summer distribution of caribou along the Hudson Bay coast apparently shifted or expanded from the area west of the Severn River to the central and eastern portions of the coast since the 1980s, and caribou observations have become much more common in the area east of the Winisk River since 1998. Because major resource development activities in the HPE are proposed and some are imminent, we recommend additional caribou surveys to document current caribou population identity, size, and distribution, and research projects to better define caribou wintering areas, calving areas, and movement patterns in the HPE.

scholarly journals Modeling Late-Summer Distribution of Golden Eagles (Aquila chrysaetos) in the Western United States

PLoS ONE ◽  
2016 ◽  
Vol 11 (8) ◽  
pp. e0159271 ◽  
Author(s):  
Ryan M. Nielson ◽  
Robert K. Murphy ◽  
Brian A. Millsap ◽  
William H. Howe ◽  
Grant Gardner
Keyword(s):  
United States ◽  
Late Summer ◽  
Western United States ◽  
Aquila Chrysaetos ◽  
Golden Eagles ◽  
Summer Distribution

Bowhead whale acoustic activity in the southeast Beaufort Sea during late summer 2008–2010

2013 ◽  
Vol 134 (6) ◽  
pp. 4323-4334 ◽  
Author(s):  
Russell A. Charif ◽  
Ashakur Rahaman ◽  
Charles A. Muirhead ◽  
Michael S. Pitzrick ◽  
Ann M. Warde ◽  
...  
Keyword(s):  
Late Summer ◽  
Beaufort Sea ◽  
Bowhead Whale ◽  
Acoustic Activity

scholarly journals Observations of Habitat Use by Polar Bears, Ursus maritimus, in the Alaskan Beaufort, Chukchi, and Northern Bering Seas

2004 ◽  
Vol 118 (3) ◽  
pp. 395 ◽  
Author(s):  
Donald J. Hansen
Keyword(s):  
Habitat Use ◽  
Polar Bear ◽  
Beaufort Sea ◽  
Ice Cover ◽  
Ursus Maritimus ◽  
Bowhead Whale ◽  
Polar Bears ◽  
Management Service ◽  
Aerial Surveys ◽  
Sea Coast

A total of 1112 Polar Bears (Ursus maritimus) at 482 sightings were recorded during aerial surveys in the Beaufort, Chukchi, and northern Bering Seas conducted primarily during September and October from 1979-1999. Of these bears, 784 were observed offshore at 400 sightings. The surveys were conducted by the Naval Ocean Systems Center and Minerals Management Service; they were designed to monitor the fall Bowhead Whale (Balaena mysticetus) migration. Over the 20-year period, 1,096,620 kilometers of surveys were flown. The majority of the offshore Polar Bears, 595 bears at 290 sightings, and most of the kill sites and polar bear tracks were recorded in 80-100% ice cover. The number of bears per kilometer increased substantially in >24% ice cover, with the highest number observed in 80-100% ice cover. This habitat use probably is related to the availability of seals, their primary prey. There were 328 bears (83 sightings) recorded on land, and most of them were associated with whale carcasses and bowhead whale subsistence harvest sites along the Alaskan Beaufort Sea coast.

Habitat selection by juvenile coho salmon in response to food and woody debris manipulations in suburban and rural stream sections

2000 ◽  
Vol 57 (9) ◽  
pp. 1804-1813 ◽  
Author(s):  
Guillermo Roberto Giannico
Keyword(s):  
Habitat Selection ◽  
Coho Salmon ◽  
Woody Debris ◽  
Dominant Role ◽  
Oncorhynchus Kisutch ◽  
Late Summer ◽  
Abundant Food ◽  
Summer Distribution ◽  
Habitat Enhancement

This study explored the effects of food and woody debris manipulations on the summer distribution of juvenile coho salmon (Oncorhynchus kisutch) in small suburban streams. To examine fish responses to these factors, three different experiments were carried out in modified sections of two streams. The results showed that the distribution of juvenile coho salmon in a stream section was primarily controlled by the availability and distribution of food among pools and by the presence and density of woody debris. Food, however, played a dominant role because the foraging quality of a pool not only affected the density of fish in it but also the response of those fish towards instream debris. In food-rich stream sections, low proportions of juvenile coho salmon occupied pools with dense woody debris in the spring, which changed towards late summer. In contrast, in food-poor reaches, high proportions of fish were found in pools with abundant debris in the spring. Pools that combined abundant food with sparse woody debris were the most favoured by the fish. It is important that salmonid habitat enhancement projects consider that open foraging areas interspersed with woody debris characterize the type of summer habitat that juvenile coho salmon prefer.

scholarly journals Bowhead Whale Distribution and Feeding near Barrow, Alaska, in Late Summer 2005–06

ARCTIC ◽  
2010 ◽  
Vol 63 (2) ◽  
Author(s):  
Sue E. Moore ◽  
J.C. "Craig" George ◽  
Gay Sheffield ◽  
Joshua Bacon ◽  
Carin J. Ashjian
Keyword(s):  
Late Summer ◽  
Bowhead Whale
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