Regina and Lumsden TV Tower Bird Mortalities, 1964

Lahrman, Fred W.

doi:10.29173/bluejay3167

bluejay

1965

DOI: 10.29173/bluejay3167

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Regina and Lumsden TV Tower Bird Mortalities, 1964

Fred W. Lahrman¹

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“…Again on September 10, 1961, two Bay-breasted Warblers were recovered at the CKCK tower. During the 1962 fall migration, five Bay-breasted and three Connecti¬ cut warblers were recovered at the CKCK-TV tower on September 7 (Lahrman, 1962) (Lahrman, 1965). The num¬ ber of these species that are consid¬ ered rare that are recovered regularly at Regina TV towers should prepare us for the occasional occurrence of rather numerous sight records of such species, when some peculiar combina¬ tion of circumstances "grounds'' the warblers that ordinarily fly over us without stopping in Regina.…”

mentioning

confidence: 99%

The 1965 Fall Warbler Migration at Regina

Belcher¹,

Binnie²,

Binnie³

1966

bluejay

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mentioning

confidence: 99%

The 1965 Fall Warbler Migration at Regina

Belcher¹,

Binnie²,

Binnie³

1966

bluejay

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Avian mortality at communication towers in the United States and Canada: which species, how many, and where?

Longcore

Rich

Mineau

et al. 2013

Biological Conservation

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a b s t r a c tBirds migrating to and from breeding grounds in the United States and Canada are killed by the millions in collisions with lighted towers and their guy wires. Avian mortality at towers is highly variable across species, and the importance to each population depends on its size and trajectory. Building on our previous estimate of avian mortality at communication towers, we calculated mortality by species and by regions. To do this, we constructed a database of mortality by species at towers from available records and calculated the mean proportion of each species killed at towers within aggregated Bird Conservation Regions. These proportions were combined with mortality estimates that we previously calculated for those regions. We then compared our estimated bird mortality rates to the estimated populations of these species in the United States and Canada. Neotropical migrants suffer the greatest mortality; 97.4% of birds killed are passerines, mostly warblers (Parulidae, 58.4%), vireos (Vireonidae, 13.4%), thrushes (Turdidae, 7.7%), and sparrows (Emberizidae, 5.8%). Thirteen birds of conservation concern in the United States or Canada suffer annual mortality of 1-9% of their estimated total population. Of these, estimated annual mortality is >2% for Yellow Rail (Coturnicops noveboracensis), Swainson's Warbler (Limnothlypis swainsonii), Pied-billed Grebe (Podilymbus podiceps), Bay-breasted Warbler (Setophaga castanea), Golden-winged Warbler (Vermivora chrysoptera), Worm-eating Warbler (Helmitheros vermivorum), Prairie Warbler (Setophaga discolor), and Ovenbird (Seiurus aurocapilla). Avian mortality from anthropogenic sources is almost always reported in the aggregate (''number of birds killed''), which cannot detect the species-level effects necessary to make conservation assessments. Our approach to per species estimates could be undertaken for other sources of chronic anthropogenic mortality.

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Regina and Lumsden TV Tower Bird Mortalities, 1964

Cited by 2 publications

References 0 publications

The 1965 Fall Warbler Migration at Regina

The 1965 Fall Warbler Migration at Regina

Avian mortality at communication towers in the United States and Canada: which species, how many, and where?

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