Heron and egret monitoring results at Marin Islands National Wildlife Refuge: 2020 and 2021 nesting seasons. Report to the San Pablo Bay National Wildlife Refugert

Author(s): 

Jennings, S.

Publication Date: 

Dec 2021

Type of Document: 

Technical Report

Audubon Canyon Ranch (ACR) has been monitoring the number of nesting herons and egrets at Marin Islands since 1979, and the annual reproductive success of Great Egrets and Great Blue Herons there since 1993. The Marin Islands supported large numbers of nesting herons and egrets from at least as early as 1979 through 2015 (Table 1). In 2015, all the nesting Snowy Egrets and Black-crowned Night-Herons abandoned the site before completing the nesting cycle and there were substantially reduced numbers of Great Egrets and Great Blue Herons (Kelly and Fischer 2018).

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the full text.

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Citation: 

Jennings, S. 2021. Heron and egret monitoring results at Marin Islands National Wildlife Refuge: 2020 and 2021 nesting season. Report to the San Pablo Bay National Wildlife Refuge. ACR Technical Report 90-3-51 © December 2021. Audubon Canyon Ranch, Cypress Grove Research Center, P. O. Box 808, Marshall, CA 93940

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