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Delaware 1983-1987


General Methods
Sampling & coverage of blocks

Each block consists of 1/6 of a USGS 7.5 minute topographic quad. Coverage was complete, and all 222 blocks were surveyed.

View blocks in the Mapping Tool >>

Coordination of coverage
Management of this project was accomplished with the help of coordinators in 6 regions.

Breeding Evidence Codes
Code Code description  (see handbook for full description & use suggestions)
OB Category - Observed: not breeding evidence
X Species (male or female) observed during its breeding season. Colonial birds, birds flying overhead, seen in unlikely breeding habitat, or outside of safe dates.
PO Category - possible breeding evidence
O Species (male or female) observed in suitable nesting habitat during its safe dates.
S Singing male present in suitable nesting habitat during its safe dates.
P Pair (sexes not distinguished) observed in suitable nesting habitat during its safe dates.
PR Category - probable breeding evidence
P* Dimorphic pair observed in suitable habitat during its safe dates.
T Permanent territory presumed through either defense (e.g. chasing of other birds) or song at same location on at least 2 occasions 7 days or more apart within safe dates.
C Courtship behavior or copulation. Not used for waterfowl.
N Visiting probable nest site.
A Agitated behavior or anxiety calls from adult.
B Nest building by wrens or excavation of holes by woodpeckers.
D Distraction display or injury feigning. Less than a strong display.
CO Category - confirmed evidence of breeding
DD Distraction display. Appearance of being life threatening.
NB Nest building by any species except wrens and woodpeckers.
PE Physiological evidence of breeding, e.g. highly vascularized, edematous brood patch or egg in oviduct based on bird in hand. (For banders.)
UN Used nests or egg shells found. Must be carefully identified, if they are to be accepted.
FL Recently fledged young (of altricial species) incapable of sustained flight or downy young (of precocial species) restricted to the natal area by dependance on adults or limited mobility.
ON Adults entering or leaving a nest site in circumstances indicating occupied nest. To be used for nests which are too high (e.g. the tops of trees) or enclosed (e.g. chimneys) for the contents to be seen. Also sitting birds that may be brooding young rather than incubating.
AY Attending young: adult carrying fecal sac or food for young; not used for terns or Osprey.
NE Nest with egg(s).
NY Nest with young seen or heard.
Habitat Codes
- - this atlas does not record habitat on the field card - -

Where this information came from
Most of the information on this page is from the project's publication or Handbook (guide for field work).
U.S. Department of the Interior || U.S. Geological Survey || Patuxent Wildlife Research Center  Laurel, MD, USA 20708-4038
This site is:
Information contained in this application does not necessarily have the endorsement of USGS.

Last updated: Site - May 2014; Content - various, depending on atlas.
Page generated on: 13-Nov-2018