Summary of nesting American Oystercatcher monitoring 2002-2004 on Fisherman Island NWR.
2002a 2003a 2004No. pairs monitored 41 48 50No. nesting attempts 53 84 60No young fledged 17 10 5Productivity est. 0.41 0.21 0.10Hatched youngb (%) 30(56.6) 28 (33.3) 27 (45.0)Pairs that hatched young 17 (35.4) 26 (52)
a results taken from Wilkeb number nests known to have hatched from all attempts
3%
17%
20%
7%
53%
mammal
avian
wash out
over due
unknown
Nest fate of unhatched clutches (n=33) in 2004 on Fisherman Island.
Summary of nesting American Oystercatcher monitoring 2002-2004 on Fisherman Island NWR.
2002a 2003a 2004No. pairs monitored 41 48 50No. nesting attempts 53 84 60No young fledged 17 10 5Hatched youngb (%) 30(56.6) 28 (33.3) 27 (45.0)Pairs that hatched young 17 (35.4) 26 (52)Productivity est. 0.41 0.21 0.10
a results taken from Wilkeb number nests known to have hatched from all attempts
Summary of nesting American Oystercatcher monitoring 2002-2004 on Fisherman Island NWR.
2002a 2003a 2004No. pairs monitored 41 48 50No. nesting attempts 53 84 60No young fledged 17 10 5Hatched youngb (%) 30(56.6) 28 (33.3) 27 (45.0)Pairs that hatched young 17 (35.4) 26 (52)Productivity est. 0.41 0.21 0.10
a results taken from Wilkeb number nests known to have hatched from all attempts
Conclusions
50 pair produced 5 chicks in 2004
Impacts from predation need to be qualified and quantified
Cameras in 2005 may provide nest fate information
Mammalian trapping may have improved hatch rate but did not affect fledge rate
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