Additonal Information on Great Blue Heron Colonies in Manitoba

Vermeer, Kees; Hatch, David R. M.

doi:10.29173/bluejay3581

Cited by 4 publications

(5 citation statements)

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“…Heronries in Saskatchewan were surveyed in 1970 and in manitoba in 1969 and 1971. 16,17,18 A total of 123 active heronries with 3,764 nests were found in the three Prairie provinces during the 1969-1971 survey. 19 Based on that figure, it was estimated that the total breeding population of Great Blue Herons in those provinces consisted of at least 4,000 breeding pairs.…”

Section: Great Blue Herons In the Prairie Provincesmentioning

confidence: 99%

Pleas for Protection of Fish-eating Bird Colonies Reminiscences of a Biologist

Vermeer¹

2018

bluejay

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Section: Great Blue Herons In the Prairie Provincesmentioning

confidence: 99%

Pleas for Protection of Fish-eating Bird Colonies Reminiscences of a Biologist

Vermeer¹

2018

bluejay

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“…Data indicate a population shift or reduction in western Manitoba where Vermeer and Hatch (1972) recorded a dozen colonies in the Duck Mountain Provincial Park area compared to the one active colony there in 1979. Colonies in southern Lake Winnipegosis east of Duck Mountain and the Turtle Mountain colony to the south increased between 1971 and 1979.…”

Section: Great Blue Heron (Ardea Herodias)mentioning

confidence: 99%

“…Thompson (1891) listed this species as an uncommon erratic summer resident in Manitoba. Manitoba colonies have recently been considered to be more numerous and larger than those in Alberta and Saskatchewan combined (Vermeer and Hatch 1972):…”

Section: Great Blue Heron (Ardea Herodias)mentioning

confidence: 99%

Status of colonial waterbirds nesting in southern Manitoba

Koonz,

Rakowski

1985

The Canadian Field-Naturalist

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The southern Manitoba nesting abundance, colony location, historic and present regional and provincial status of 12 colonial nesting waterbird species have been assembled, with major field data collected in 1979. American White Pelican (Pelecanus erythrorhynchos), Double-crested Cormorant (Phalacrorax auritus), and Ring-billed Gull (Larus delawarensis) breeding populations were at or near historic peaks with cormorant and pelican numbers larger than recent estimates for all of Canada. Eared Grebe (Podiceps nigricollis), and Western Grebe (Aechmophorus occidentalis) populations were considered in decline as were Common Tern (Sterna hirundo) and Caspian Tern (Sterna caspia) numbers. Management should include stronger protective measures, public education, colony habitat management, and monitoring of known and suspected colony locations. Human encroachment, pesticides, marsh draining, water-level manipulation, and disturbance are major threats to all Manitoba waterbird species.

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“…Surveys of colonies of Great Blue Herons (Ardea herodias) were conducted in Alberta in 1967 (Vermeer 1969a), in Saskatchewan in 1970 (Vermeer and Anweiler 1970), and in Manitoba in 1969 (Vermeer 1970a) and in 1971 (Vermeer and Hatch 1972). Doublecrested Cormorant (Phalacrocorax auritus) colonies were surveyed in Alberta in 1967 (Vermeer 1969b), in Saskatchewan in 1968 (Vermeer 1970b), and in Manitoba in 1969 (Vermeer 1969c).…”

Section: Introductionmentioning

confidence: 99%