Distribution and size of colonies of white pelicans, Pelecanus erythrorhynchos, in Canada

1970 ◽  
Vol 48 (5) ◽  
pp. 1029-1032 ◽  
Author(s):  
Kees Vermeer
Keyword(s):  
Rocky Mountains ◽  
Food Supply ◽  
Breeding Population ◽  
Canadian Shield ◽  
Southern Boundary ◽  
Breeding Range ◽  
Eastern Boundary ◽  
Pelecanus Erythrorhynchos ◽  
Mammalian Predators ◽  
Nesting Sites

On the basis of a count of 14 103 nests, the total breeding population of white pelicans in Canada was estimated to consist of 30 000 birds for the years 1967–1969, seven times higher than previous estimates. The boundaries of the Canadian breeding range of pelicans were found to coincide closely with the 0 °C isotherm in April, the southern boundary of the Canadian Shield, and the eastern boundary of the Rocky Mountains. As those factors appeared to be closely related to the availability of fish, it is concluded that the extent of the breeding range of the pelicans in Canada is mainly determined by the food supply. Besides availability of fish, pelicans appeared to require nesting sites inaccessible to mammalian predators.

scholarly journals White Pelican Reproduction in the Molly Islands Breeding Colony, Yellowstone National Park

1984 ◽  
Vol 8 ◽  
pp. 85-88
Author(s):  
Kenneth Diem
Keyword(s):  
National Park ◽  
Breeding Population ◽  
Breeding Colony ◽  
Yellowstone Lake ◽  
The North ◽  
Pelecanus Erythrorhynchos ◽  
Nesting Sites ◽  
A Minor ◽  
American White Pelican ◽  
Continue Monitoring

Compared to other North American White Pelican, Pelecanus erythrorhynchos, breeding colonies, the Molly Islands Colony is a minor colony consisting of 400-600 adults (Lier and Behle, 1966; Diem and Condon, 1967; Sloan, 1973; Diem, 1976). Despite its small size, the colony is unique for these reasons: 1) it is the only White Pelican breeding colony in a national park; 2) the location of the colony at an elevation of 7,733 ft (2,357 m) is the highest recorded for any breeding colony of the species; 3) discovered in 1890, the colony has had variable surveillance since 1917, with relatively intense monitoring since 1965; 4) the breeding population is composed of birds from both coasts of North America; and 5) the colony's nesting sites on the two Molly Islands change frequently with no predictable pattern. In addition, a cumulative sutstrate uplift along the north shore of Yellowstone Lake appears to have significantly raised the stable water level of the southern arms of the lake. Consequently, the major objective of this project is to continue monitoring changes in the reproductive success of the Molly Islands White Pelican colony and to continue studies of the factors influencing those changes.

scholarly journals White Pelican Reproduction in the Molly Islands Breeding Colony, Yellowstone National Park

1978 ◽  
Vol 2 ◽  
pp. 79-81
Author(s):  
Kenneth Diem
Keyword(s):  
National Park ◽  
Breeding Population ◽  
Breeding Colony ◽  
Major Objective ◽  
Pelecanus Erythrorhynchos ◽  
Predictable Pattern ◽  
Nesting Sites ◽  
A Minor ◽  
American White Pelican ◽  
Continue Monitoring

Compared to other North American white pelican, Pelecanus erythrorhynchos, breeding colonies, the Molly Islands Colony is a minor colony consisting of +450 adults (Lier and Behle, 1966; Diem and Condon, 1967; Sloan, 1973; Diem, 1976). Despite its small size, the colony is unique for these reasons: (1) it is the only white pelican breeding colony in a national park; (2) the location of the colony at an elevation of 7,733 ft (2,357 m) is the highest recorded for any breeding colony of the species; (3) discovered in 1890, the colony has had variable surveillance since 1917, with relatively intense monitoring since 1965; (4) the breeding population is composed of birds from both coasts of North America; and (5) the colony's nesting sites on the two Molly Islands change frequently with no predictable pattern. The major objective of this project is to continue monitoring changes in the reproductive success of the Molly Islands white pelican colony and to continue studies of the factors influencing those changes.

scholarly journals White Pelican Reproduction in the Molly Islands Breeding Colony, Yellowstone National Park

1985 ◽  
Vol 9 ◽  
pp. 140-143
Author(s):  
Kenneth Diem
Keyword(s):  
National Park ◽  
Breeding Population ◽  
Breeding Colony ◽  
Yellowstone Lake ◽  
The North ◽  
Pelecanus Erythrorhynchos ◽  
Nesting Sites ◽  
A Minor ◽  
American White Pelican ◽  
Continue Monitoring

Compared to other North American White Pelican, Pelecanus erythrorhynchos, breeding colonies, the Molly Islands Colony is a minor colony consisting of 400-600 adults (Lier and Behle, 1966; Diem and Condon, 1967; Sloan, 1973; Diem, 1976). Despite its small size, the colony is unique for these reasons: 1) it is the only White Pelican breeding colony in a national park; 2) the location of the colony at an elevation of 7,733 ft (2,357 m) is the highest recorded for any breeding colony of the species; 3) discovered in 1890, the colony has had variable surveillance since 1917, with relatively intense monitoring since 1965; 4) the breeding population is composed of birds from both coasts of North America; and 5) the colony's nesting sites on the two Molly Islands change frequently with no predictable pattern. In addition, a cumulative substrate uplift along the north shore of Yellowstone Lake appears to have significantly raised the stable water level of the southern arms of the lake. Consequently, the major objective of this project is to continue monitoring changes in the reproductive success of the Molly Islands White Pelican colony and to continue studies of the factors influencing those changes.

scholarly journals White Pelican Reproduction in the Molly Islands Breeding Colony, Yellowstone National Park

1983 ◽  
Vol 7 ◽  
pp. 103-106
Author(s):  
Kenneth Diem
Keyword(s):  
National Park ◽  
Breeding Population ◽  
Breeding Colony ◽  
Yellowstone Lake ◽  
The North ◽  
Pelecanus Erythrorhynchos ◽  
Nesting Sites ◽  
A Minor ◽  
American White Pelican ◽  
Continue Monitoring

Compared to other North American White Pelican, Pelecanus erythrorhynchos, breeding colonies, the Molly Islands Colony is a minor colony consisting of 400-600 adults (Lier and Behle, 1966; Diem and Condon, 1967; Sloan, 1973; Diem, 1976). Despite its small size, the colony is unique for these reasons: 1) it is the only White Pelican breeding colony in a national park; 2) the location of the colony at an elevation of 7,733 ft (2,357 m) is the highest recorded for any breeding colony of the species; 3) discovered in 1890, the colony has had variable surveillance since 1917, with relatively intense monitoring since 1965; 4) the breeding population is composed of birds from both coasts of North America; and 5) the colony's nesting sites on the two Molly Islands change frequently with no predictable pattern. In addition, a cumulative substrate uplift along the north shore of Yellowstone Lake appears to have significantly raised the stable water level of the southern arms of the lake. Consequently, the major objective of this project is to continue monitoring changes in the reproductive success of the Molly Islands White Pelican colony and to continue studies of the factors influencing those changes.

scholarly journals White Pelican Reproduction in the Molly Islands Breeding Colony, Yellowstone National Park

1981 ◽  
Vol 5 ◽  
pp. 128-130
Author(s):  
Kenneth Diem
Keyword(s):  
National Park ◽  
Breeding Population ◽  
Breeding Colony ◽  
Major Objective ◽  
Pelecanus Erythrorhynchos ◽  
Predictable Pattern ◽  
Nesting Sites ◽  
A Minor ◽  
American White Pelican ◽  
Continue Monitoring

Compared to other North American White Pelican, Pelecanus erythrorhynchos, breeding colonies, the Molly Islands Colony is a minor colony consisting of 400-600 adults (Lier and Behle, 1966; Diem and Condon, 1967; Sloan, 1973; Diem, 1976). Despite its small size, the colony is unique for these reasons: 1) it is the only White Pelican breeding colony in a national park; 2) the location of the colony at an elevation of 7,733 ft (2,357 m) is the highest recorded for any breeding colony of the species; 3) discovered in 1890, the colony has had variable surveillance since 1917, with relatively intense monitoring since 1965; 4) the breeding population is composed of birds from both coasts of North America; and 5) the colony's nesting sites on the two Molly Islands change frequently with no predictable pattern. The major objective of this project is to continue monitoring changes in the reproductive success of the Molly Islands White Pelican colony and to continue studies of the factors influencing those changes.

The potential breeding range of Slender-billed Curlew Numenius tenuirostris identified from stable-isotope analysis

2017 ◽  
Vol 28 (2) ◽  
pp. 228-237
Author(s):  
GRAEME M. BUCHANAN ◽  
ALEXANDER L. BOND ◽  
NICOLA J. CROCKFORD ◽  
JOHANNES KAMP ◽  
JAMES W. PEARCE-HIGGINS ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Western Siberia ◽  
Isotope Analysis ◽  
Breeding Population ◽  
Calibration Equation ◽  
Breeding Sites ◽  
Breeding Range ◽  
Nest Sites ◽  
Nesting Sites ◽  
Southern Russia

SummaryThe breeding areas of the Critically Endangered Slender-billed Curlew Numenius tenuirostris are all but unknown, with the only well-substantiated breeding records being from the Omsk province, western Siberia. The identification of any remaining breeding population is of the highest priority for the conservation of any remnant population. If it is extinct, the reliable identification of former breeding sites may help determine the causes of the species’ decline, in order to learn wider conservation lessons. We used stable isotope values in feather samples from juvenile Slender-billed Curlews to identify potential breeding areas. Modelled precipitation δ2H data were compared to feather samples of surrogate species from within the potential breeding range, to produce a calibration equation. Application of this calibration to samples from 35 Slender-billed Curlew museum skins suggested they could have originated from the steppes of northern Kazakhstan and part of southern Russia between 48°N and 56°N. The core of this area was around 50°N, some way to the south of the confirmed nesting sites in the forest steppes. Surveys for the species might be better targeted at the Kazakh steppes, rather than around the historically recognised nest sites of southern Russia which might have been atypical for the species. We consider whether agricultural expansion in this area may have contributed to declines of the Slender-billed Curlew population.

scholarly journals White Pelican Reproduction in the Molly Islands Breeding Colony, Yellowstone National Park

1986 ◽  
Vol 10 ◽  
pp. 185-188
Author(s):  
Kenneth Diem
Keyword(s):  
National Park ◽  
Breeding Population ◽  
Breeding Colony ◽  
Yellowstone Lake ◽  
The North ◽  
Pelecanus Erythrorhynchos ◽  
Nesting Sites ◽  
A Minor ◽  
American White Pelican ◽  
Continue Monitoring

Compared to other North American White Pelican, Pelecanus erythrorhynchos, breeding colonies, the Molly Islands Colony is a minor colony consisting of 400-600 adults (Lier and Behle, 1966; Diem and Condon, 1967; Sloan, 1973; Diem, 1976). Despite its small size, the colony is unique for these reasons: 1) it is the only White Pelican breeding colony in a national park; 2) the location of the colony at an elevation of 7,733 ft (2,357 m) is the highest recorded for any breeding colony of the species; 3) discovered in 1890, the colony has had variable surveillance since 1917, with relatively intense monitoring since 1965; 4) the breeding population is composed of birds from both coasts of North America; and 5) the colony's nesting sites on the two Molly Islands change frequently with no predictable pattern. In addition, a cumulative substrate uplift along the north shore of Yellowstone Lake appears to have significantly raised the stable water level of the southern arms of the lake. Consequently, the major objective of this project is to continue monitoring changes in the reproductive success of the Molly Islands White Pelican colony and to continue studies of the factors influencing these changes.

scholarly journals White Pelican Reproduction in the Molly Islands Breeding Colony, Yellowstone National Park

1982 ◽  
Vol 6 ◽  
pp. 115-119
Author(s):  
Kenneth Diem
Keyword(s):  
National Park ◽  
Breeding Population ◽  
Breeding Colony ◽  
Major Objective ◽  
Pelecanus Erythrorhynchos ◽  
Predictable Pattern ◽  
Nesting Sites ◽  
A Minor ◽  
American White Pelican ◽  
Continue Monitoring

Compared to other North American White Pelican, Pelecanus erythrorhynchos, breeding colonies, the Molly Islands Colony is a minor colony consisting of 400-600 adults (Lier and Behle, 1966; Diem and Condon, 1967; Sloan, 1973; Diem, 1976). Despite its small size, the colony is unique for these reasons: 1) it is the only White Pelican breeding colony in a national park; 2) the location of the colony at an elevation of 7,733 ft. (2,357 m) is the highest recorded for any breeding colony of the species; 3) discovered in 1890, the colony has had variable surveillance since 1917, with relatively intense monitoring since 1965; 4) the breeding population is composed of birds from both coasts of North America; and 5) the colony's nesting sites on the two Molly Islands change frequently with no predictable pattern. The major objective of this project is to continue monitoring changes in the reproductive success of the Molly Islands White Pelican colony and to continue studies of the factors influencing those changes.

scholarly journals White Pelican Reproduction in the Molly Islands Breeding Colony, Yellowstone National Park

1979 ◽  
Vol 3 ◽  
pp. 90-92
Author(s):  
Kenneth Diem
Keyword(s):  
National Park ◽  
Breeding Population ◽  
Breeding Colony ◽  
Major Objective ◽  
Pelecanus Erythrorhynchos ◽  
Predictable Pattern ◽  
Nesting Sites ◽  
A Minor ◽  
American White Pelican ◽  
Continue Monitoring

Compared to other North American white pelican, Pelecanus erythrorhynchos, breeding colonies, the Molly Islands Colony is a minor colony consisting of +450 adults (Lier and Behle, 1966; Diem and Condon, 1967; Sloan, 1973; Diem, 1976). Despite its small size, the colony is unique for these reasons: (1) it is the only white pelican breeding colony in a national park; (2) the location of the colony at an elevation of 7,733 ft (2,357 m) is the highest recorded for any breeding colony of the species; (3) discovered in 1890, the colony has had variable surveillance since 1917, with relatively intense monitoring since 1965; (4) the breeding population is composed of birds from both coasts of North America; and (5) the colony's nesting sites on the two Molly Islands change frequently with no predictable pattern. The major objective of this project is to continue monitoring changes in the reproductive success of the Molly Islands white pelican colony and to continue studies of the factors influencing those changes.

scholarly journals White Pelican Reproduction in the Molly Islands Breeding Colony, Yellowstone National Park

1987 ◽  
Vol 11 ◽  
pp. 160-164
Author(s):  
Kenneth Diem
Keyword(s):  
National Park ◽  
Breeding Population ◽  
Breeding Colony ◽  
Yellowstone Lake ◽  
The North ◽  
Pelecanus Erythrorhynchos ◽  
Nesting Sites ◽  
A Minor ◽  
American White Pelican ◽  
Continue Monitoring

Compared to other North American White Pelican, Pelecanus erythrorhynchos, breeding colonies, the Molly Islands Colony is a minor colony consisting of 400-600 adults (Lier and Behle, 1966: Diem and Condon, 1967: Sloan, 1973; Diem, 1976). Despite its small size, the colony is unique for these reasons: 1) it is the only White Pelican breeding colony in a national park; 2) the location of the colony at an elevation of 2,357 m is the highest recorded for any breeding colony of the species; 3) discovered in 1890, the colony has had variable surveillance since 1917, with relatively intense monitoring since 1965: 4) the breeding population is composed of birds from both coasts of North America; and 5) the colony's nesting sites on the two Molly Islands change frequently with no predictable pattern. In addition, a cumulative substrate uplift along the north shore of Yellowstone lake appears to have significantly raised the stable water level of the southern arms of the lake. Consequently, the major objective of this project is to continue monitoring changes in the reproductive success of the Molly Islands White Pelican colony and to continue studies of the factors influencing those changes.

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