If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

Positive relationship between non-native and native squirrels in an urban landscape

$50.00 plus tax (Refund Policy)

Buy Article:

Abstract:

Paradoxically, non-native species sometimes displace native species that appear to be well adapted to local landscapes. That many landscapes have been altered by humans, creating habitat suitable for non-native species, helps explain this apparent paradox. We asked whether the abundance of native Douglas (Tamiasciurus douglasii (Bachman, 1839)) and northern flying (Glaucomys sabrinus (Shaw, 1801)) squirrels was best explained by the abundance of non-native eastern grey squirrels (Sciurus carolinensis Gmelin, 1788), the proportion of urban development, or both using available squirrel abundance data from wildlife shelters and land-use maps. There was no evidence that non-native squirrels replaced native squirrels given that their abundances were positively related, whereas native squirrels varied negatively with the amount of development. The best model explaining variation in the abundance of Douglas and northern flying squirrels incorporated both eastern grey squirrels and development, which is consistent with the hypothesis that regional declines in native squirrels are more likely to be predicated by the alteration of native conifer habitats by humans independent of the effects of non-native squirrels.

Il arrive paradoxalement que des espèces non indigènes évincent des espèces indigènes qui semblent bien adaptées aux paysages locaux. Le paradoxe apparent s’explique en partie par la modification anthropique de nombreux paysages, ce qui crée des habitats pour les espèces non indigènes. Nous nous demandons si les abondances des écureuils de Douglas (Tamiasciurus douglasii (Bachman, 1839)) et du grand polatouche (Glaucomys sabrinus (Shaw, 1801)) s’expliquent mieux par l’abondance de l’écureuil gris (Sciurus carolinensis Gmelin, 1788) non indigène ou par l’importance du développement urbain, ou encore par les deux phénomènes; nous utilisons les données d’abondance des sciuridés disponibles dans les refuges de faune sauvage, ainsi que des cartes d’utilisation des terres. Il n’y a aucune indication que les écureuils non indigènes évincent les sciuridés indigènes puisqu’il y a une corrélation positive entre leurs abondances respectives; en revanche, l’abondance des écureuils indigènes est en corrélation négative avec l’importance du développement. Le meilleur modèle explicatif de l’abondance des écureuils de Douglas et des grands polatouches tient compte à la fois des écureuils gris et du développement, ce qui s’accorde avec l’hypothèse selon laquelle les déclins régionaux de sciuridés indigènes sont plus vraisemblablement attribuables à la modification des habitats indigènes de conifères par les humains, indépendamment des effets des écureuils non indigènes.

Document Type: Research Article

Publication date: May 1, 2008

More about this publication?
  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Terms & Conditions
  • Sample Issue
  • Reprints & Permissions
  • ingentaconnect is not responsible for the content or availability of external websites
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more