Wildlife Gardeners - North American Wildlife Gardening  

Go Back   Wildlife Gardeners - North American Wildlife Gardening > Wildlife Gardeners of North America Unite > Birds Including Raptors & Hummers

Reply
 
LinkBack Thread Tools Display Modes
Old 11-16-2010, 03:53 PM   #1
WG Staff
 
Staff's Avatar
 
Join Date: Nov 2008
Default An Experimental Assessment of Vehicle Disturbance Effects on Migratory Shorebirds

An Experimental Assessment of Vehicle Disturbance Effects on Migratory Shorebirds
Nathan M. Tarr, Theodore R. Simons, and Kenneth H. Pollock

Wildlife Online - An Experimental Assessment of Vehicle Disturbance Effects on Migratory Shorebirds
Quote:
Abstract
Off-road vehicle (ORV) traffic is one of several forms of disturbance thought to affect shorebirds at migration stopover sites. Attempts to measure disturbance effects on shorebird habitat use and behavior at stopover sites are difficult because ORV disturbance is frequently confounded with habitat and environmental factors. We used a before-after-control-impact experimental design to isolate effects of vehicle disturbance from shorebird responses to environmental and habitat factors. We manipulated disturbance levels within beach closures along South Core Banks, North Carolina, USA, and measured changes in shorebird abundance and location, as well as the activity of one focal species, the sanderling (Calidris alba), within paired control and impact plots. We applied a discrete treatment level of one flee-response-inducing event every 10 minutes on impact plots. We found that disturbance reduced total shorebird and black-bellied plover (Pluvialis squatarola) abundance and reduced relative use of microhabitat zones above the swash zone (wet sand and dry sand) by sanderlings, black-bellied plovers, willets (Tringa semipalmata), and total shorebirds. Sanderlings and total shorebirds increased use of the swash zone in response to vehicle disturbance. Disturbance reduced use of study plots by sanderlings for resting and increased sanderling activity, but we did not detect an effect of vehicle disturbance on sanderling foraging activity. We provide the first estimates of how a discrete level of disturbance affects shorebird distributions among ocean beach microhabitats. Our findings provide a standard to which managers can compare frequency and intensity of disturbance events at other shorebird stopover and roosting sites and indicate that limiting disturbance will contribute to use of a site by migratory shorebirds.
__________________
The tendency of man's nature to good is like the tendency of water to flow downwards.
-Mencius
Staff is offline   Reply With Quote
Reply

Tags
assessment, atv, atv's, bird, bird disturbances, bird habitat, birds, disturbance, disturbance levels, effect, effects, experimental, four wheeler, habitat, microhabitats, migrate, migrating birds, migration, migratory, migratory birds, migratory shorebirds, noise, shorebirds, vehicle, vehicle disturbance

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 08:07 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.3.2