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Apparent nest success and daily nest survival (DNS) of Saltmarsh Sparrows in the northeastern USA from studies conducted prior to 2004; nest success averages higher than in more recent studies (see text for details).

Source

Years of study

State

N (nests)

Success (%)

DNS

Post & Greenlaw 1982

1977-1980

NY

176

27

0.94

DeRagon 1988

1981-1982

RI

101

441

0.96

DiQuinzo et al. 2002

1993-1998

RI

136

27

0.942

Gjerdrum et al. 2005

2002-2003

CT

125

27

0.94

Greenberg et al. 20063

2002-2003

MD

18

36

0.95

Shriver et al. 2007

1998-2001

ME

69

53

0.97

1DeRagon (1988) reported a crude success rate. Greenberg et al. (2006) estimated a corrected value (100-56% total loss) from a regression of Mayfield rates on crude rates.

2DNS over a 21-day nest-cycle.

3Data originally from P. Marra and B. Schmeling (unpublished).