Fisherman Island National Wildlife Refuge American Oystercatcher 2004 Productivity.

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Fisherman Island National Wildlife Refuge American Oystercatcher 2004 Productivity

Transcript of Fisherman Island National Wildlife Refuge American Oystercatcher 2004 Productivity.

Fisherman IslandNational Wildlife Refuge

American Oystercatcher2004 Productivity

2004 AMOY Attempts

2004 AMOY Fledged Chicks

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.

Brood Loss

11 broods lost <7 days

5 broods lost 7-11 days

5 broods lost 22-30 days

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

Alex Wilke 2004