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Conserv Biol. 2014 Jun;28(3):724-34. doi: 10.1111/cobi.12259. Epub 2014 Mar 11.

Direct effects of cattle on grassland birds in Canada.

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Golder Associates Ltd, 102, 2535 - 3rd Avenue SE, Calgary, AB, T2A 7W5, Canada.


Effects of grazing on grassland birds are generally thought to be indirect, through alteration of vegetation structure; however, livestock can also affect nest survival directly through trampling and other disturbances (e.g., livestock-induced abandonment). We extracted data on nest fates from 18 grazing studies conducted in Canada. We used these data to assess rates of nest destruction by cattle among 9 ecoregions and between seasonal and rotational grazing systems. Overall, few nests were destroyed by cattle (average 1.5% of 9132 nests). Nest destruction was positively correlated with grazing pressure (i.e., stocking rate or grazing intensity), but nest survival was higher in more heavily grazed areas for some species. Because rates of destruction of grassland bird nests by cattle are low in Canada, management efforts to reduce such destruction may not be of ecological or economic value in Canada.


destrucción de nidos; grazing; nest destruction; nest survival; pastoreo; pisoteo; supervivencia de nidos; trampling

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