RefDoc
Haut

Faire une nouvelle recherche
Make a new search
Lancer la recherche


Titre du document / Document title

Poleward shifts in winter ranges of north american birds

Auteur(s) / Author(s)

LA SORTE Frank A. (1) ; THOMPSON Frank R. (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Fisheries and Wildlife Sciences, University of Missouri, Columbia, Missouri 65211, ETATS-UNIS
(2) USDA Forest Service, Northern Research Station, University of Missouri, Columbia, Missouri 65211, ETATS-UNIS

Résumé / Abstract

Climate change is thought to promote the poleward movement of geographic ranges; however, the spatial dynamics, mechanisms, and regional anthropogenic drivers associated with these trends have not been fully explored. We estimated changes in latitude of northern range boundaries, center of occurrence, and center of abundance for 254 species of winter avifauna in North America from 1975 to 2004. After accounting for the effect of range size and the location of the northern boundary, positive latitudinal trends were evident for the northern boundary (1.48 km/yr), center of occurrence (0.45 km/yr), and center of abundance (1.03 km/yr). The northern boundary, when examined across individual species, had the most variable trends (SD = 7.46 km/yr) relative to the center of occurrence (SD = 2.36 km/yr) and center of abundance (SD = 5.57 km/yr). Trends did not differ based on migratory status, but there was evidence that trends differed for species with ranges centered in the southern vs. northern portion of the study area. Species occurred more sporadically over time at northern range boundaries, and northern boundaries were associated with a concentration of colonization and extirpation events, with a greater prevalence of colonization events likely promoting poleward trends. Regional anthropogenic drivers explained ∼8% of the trend for the northern boundary, 14% for the center of occurrence, and 18% for the center of abundance; however, these effects were localized in the northern portion of species' ranges and were associated with distributional changes within ranges, primarily abundance, producing patterns that mimicked poleward movements. We conclude that poleward distributional shifts represent the interaction between climate change and regional factors whose outcome is determined by the scale of the analysis and the biotic and abiotic features in the region, and how anthropogenic activities have impacted these features.

Revue / Journal Title

Ecology    ISSN  0012-9658   CODEN ECGYAQ 

Source / Source

2007, vol. 88, no7, pp. 1803-1812 [10 page(s) (article)] (1 p.1/4)

Langue / Language

Anglais

Editeur / Publisher

Ecological Society of America, Washington, DC, ETATS-UNIS  (1920) (Revue)

Mots-clés anglais / English Keywords

Vertebrata

;

America

;

Distribution range

;

Turnover

;

Planetary scale

;

Global change

;

Climate modification

;

Geographic distribution

;

Fauna

;

Animal community

;

Ecological abundance

;

Aves

;

North America

;

Mots-clés français / French Keywords

Vertebrata

;

Amérique

;

Aire de distribution

;

Turnover

;

Echelle planétaire

;

Changement global

;

Modification climat

;

Répartition géographique

;

Faune

;

Communauté animale

;

Abondance écologique

;

Aves

;

Amérique du Nord

;

Mots-clés espagnols / Spanish Keywords

Vertebrata

;

America

;

Area de distribución

;

Turnover

;

Escala planetaria

;

Cambio global

;

Modificación clima

;

Distribución geográfica

;

Fauna

;

Comunidad animal

;

Abundancia ecológica

;

Aves

;

America del norte

;

Mots-clés d'auteur / Author Keywords

abundance

;

Christmas Bird Count

;

common species

;

distribution of avifauna

;

geographical range

;

global climate change

;

North America

;

temporal turnover

;

winter range

;

Localisation / Location

INIST-CNRS, Cote INIST : 3018, 35400014656665.0200

Nº notice refdoc (ud4) : 18859236



Faire une nouvelle recherche
Make a new search
Lancer la recherche
Bas