Nocturnal Calling Frog Surveys at Marsh-Billings-Rockefeller NHP in Vermont, USA (1999-2000)

Study Extent

Marsh-Billings-Rockefeller NHP, Woodstock, Vermont, USA

Sampling

To inventory frogs, a protocol established for the Vermont Calling Frog Survey was modified and used to sample the Pogue, the Field-Wetland, and the Hardwood-Wetland. A total of 10 listening stations were established; 6 around the Pogue, and 2 at each of the wetlands (Fig. 1). Systematic aural surveys of calling frogs occurred on rainy or humid nights throughout the spring and summer. At each station, all frogs heard calling during a 10-minute period were identified to species and their relative abundance estimated based upon the following codes: Code 1: Can clearly hear all individuals of a species and can count them easily – there is ample space (time) between calling individuals. Code 2: There is some overlap of calls between individuals of a species, but not so much as to make an accurate count impossible. Code 3: A full chorus. Calls for a species are constant, continuous, and overlapping.

Method steps

1. see above

frogs

1. Anura
   common name: frogs rank: order

Marsh-Billings-Rockefeller NHP, Woodstock, Vermont, USA