Kelly, J. P.
N. Nur

Publication Date: 

Jan 2015

Type of Document: 

As top wetland predators that operate over large areas of the San Francisco Estuary, herons and egrets
depend on extensive tidal marshes, seasonal wetlands, and associated freshwater systems. The State of
the Estuary Report uses prefledging brood size among successful heron and egret nests to assess
ecological conditions across broad wetland landscapes. The section on “Feeding Chicks,” in the
“Processes” chapter of the 2015 State of the Estuary Report, summarizes the Heron and Egret Broodsize
Indicator, described more fully here. This indicator uses the number of young produced in
successful nests to index conditions that affect the availability of food, the productivity of estuarine food
webs, and the quality of wetland feeding areas.

Web Page Link: 


Kelly, J. P., and N. Nur. 2015. Processes–heron and egret brood size indicator. Technical summary and appendix, in State of the San Francisco Estuary 2015: Status and Trends Update on 33 Indicators of Ecosystem Health, San Francisco Estuary Partnership. []