NDLI: The Effect of Bald Eagles and Boat Traffic on Nesting Double-crested Cormorants (Phalacrocorax auritus) In the Strait of Georgia

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The Effect of Bald Eagles and Boat Traffic on Nesting Double-crested Cormorants (Phalacrocorax auritus) In the Strait of Georgia

Content Provider	Semantic Scholar
Author	Giesbrecht, Tanya
Copyright Year	2001
Abstract	It is suspected that boat traffic or Bald Eagle disturbance cause declines in Double-crested Cormorants in the Strait of Georgia. The purpose of this study was to determine the relative significance of disturbance to nesting Doublecrested Cormorants from Bald Eagles and boat traffic. Double-crested Cormorants were observed from late May to late August at four sites in the Strait of Georgia: Chain Island, Mandarte Island, Crofton dolphins, and Five-fingers Island. Disturbance types included Bald Eagles, fishing boats, tourist boats, and kayaks. The total number of possible disturbances was summarized from the colony observations, as were flushing events caused by each category of disturbance. Eagles were found to disturb nesting cormorants when they came within ten metres of a nest, causing the cormorants to vacate the colony. Nesting cormorants were not observed to vacate their nests as a result of any category of boat traffic. Introduction Disturbance of marine fauna has become a major concern to wildlife managers. Eco-tourism in British Colombia is growing by about 10-30% annually, which means that every year there are more vessels on the water observing marine fauna. However, the effect of boat traffic on marine fauna is not known. If boat traffic is adversely affecting marine animals, then guidelines and regulations should be developed and implemented (Malcolm & Lochbaum, 1999). Double-crested Cormorants (Phalacrocorax auritus) are of particular interest to wildlife managers because they are on the edge of their range in the Strait of Georgia. Furthermore, Double-crested Cormorants have not always
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://a100.gov.bc.ca/appsdata/acat/documents/r32412/CormorantDisturbanceStudy_map__1350659194360_cc11cb6b3a6a5548e044cb3372873059ef8329f318d6f7ce770097595516c6be.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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