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Grassland Bird Responses to Three Edge Types in a Fragmented Mixed-Grass Prairie
Sliwinski, Maggi S. ; Koper, Nicola
Avian conservation and ecology, 2012-12, Vol.7 (2), p.6-6, Article art6
Resilience Alliance
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Título:
Grassland Bird Responses to Three Edge Types in a Fragmented Mixed-Grass Prairie
Autor:
Sliwinski, Maggi S.
;
Koper, Nicola
Assuntos:
Anthus spragueii
;
Calcarius ornatus
;
Chestnut-collared Longspur
;
edge effects
;
fragmentation
;
mixed-grass prairie
;
nonlinear regression
;
road ecology
;
Sprague's Pipit
É parte de:
Avian conservation and ecology, 2012-12, Vol.7 (2), p.6-6, Article art6
Notas:
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
Descrição:
One possible factor that may have contributed to the decline of grassland bird populations is edge avoidance. In the mixed-grass prairie, habitat fragmentation is often caused by juxtaposition of habitats with vegetation that is structurally similar to prairie, making it difficult to understand why birds avoid habitat edges. We hypothesized that display height or resource-use strategy, i.e., the degree to which a species depends on grassland habitat, might explain variation in sensitivity to habitat edges among different species of grassland birds. To test our hypotheses, we used data on the abundance of grassland birds in native mixed-grass prairie fields in southern Alberta, Canada, from 2000 to 2002. Point counts were conducted up to 4.1 km from croplands, 2.2 km from roads, and 1.8 km from wetlands. We used nonlinear regression models to determine the distance at which relative abundance of 12 bird species changed in response to edge, and linear regression to determine if display height or resource-use strategy explained variation in response to different types of edges. Variation in response to edge was not explained by display height or resource-use strategy. However, six species avoided wetland edges, two avoided roads, and four avoided cropland. Two species of conservation concern, Chestnut-collared Longspurs (Calcarius ornatus) and Sprague's Pipits (Anthus spragueii), declined in abundance by 25% or more within 1.95 km and 0.91 km, respectively, of cropland edges. Because Chestnut-collared Longspurs avoided croplands to at least 1.95 km, it will be important to prevent further fragmentation of mixed-grass prairies by agriculture.Original Abstract: L'evitement des bordures est un des facteurs avances dans le declin des populations d'oiseaux de prairie. Dans la prairie mixte, la fragmentation d'habitat se presente souvent sous la forme d'une juxtaposition de milieux dont la vegetation est structurellement similaire a la prairie, ce qui rend difficile de comprendre pourquoi les oiseaux evitent les bordures d'habitat. Nous avons emis l'hypothese voulant que la hauteur de parade ou la strategic d'utilisation des ressources, c'est-a-dire a quel degre une espece depend de l'habitat de prairie, expliquerait peut-etre la variation de sensibilite aux bordures chez differentes especes d'oiseaux de prairie. Afin de tester notre hypothese, nous avons utilise des donnees d'abondance des oiseaux de prairie dans des champs de prairie mixte naturelle du sud de l'Alberta, au Canada, de 2000 a 2002. Des denombrements par points d'ecoute ont ete effectues jusqu'a 4,1 km de terres cultivees, jusqu'a 2,2 km de routes et jusqu'a 1,8 km de milieux humides. Nous avons utilise la regression non lineaire dans le but de determiner la distance a laquelle l'abondance relative de 12 especes d'oiseaux changeait en reaction aux bordures, et la regression lineaire pour etablir si la hauteur de parade ou la strategic d'utilisation des ressources expliquait la variation de reaction selon les differents types de bordure. La variation dans la reaction aux bordures n'a pas ete expliquee par la hauteur de parade ni par la strategic d'utilisation des ressources. Toutefois, six especes ont evite les bordures avec les milieux humides, deux ont evite celles avec les routes et quatre, celles avec les terres cultivees. L'abondance de deux especes dont la conservation est preoccupante, le Plectrophane a ventre noir (Calcarius ornatus) et le Pipit de Sprague (Anthus spragueii), a decline d'au moins 25% en deca de 1,95 km et de 0,91 km d'une bordure de terre cultivee, respectivement. Etant donne que le plectrophane a evite les terres cultivees par 1,95 km au minimum, il sera important d'empecher davantage la fragmentation des prairies mixtes par l'agriculture.
Editor:
Resilience Alliance
Idioma:
Inglês;Francês
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