Factors affecting the reproductive success of American Oystercatchers Haematopus palliatus on the outer banks of North Carolina

Marine Ornithology: Journal of Seabird Research and Conservation
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Abstract

We used an information-theoretic approach to assess the factors affecting the reproductive success of American Oystercatchers Haematopus
palliatus on the Outer Banks of North Carolina. We evaluated survival with respect to nesting island, year, time of season, brood age, distance
to tide (m), presence of off-road vehicles and proximity of foraging habitat. The daily nest survival (mean 0.981, standard error [SE] 0.002)
was affected by year and island, and declined over the nesting season. Mammals were responsible for 54% of identified nest failures. Daily
brood survival (mean 0.981, SE 0.002) varied by island and increased non-linearly with age, with highest mortality in the seven days after
hatching. Model results indicate direct access to foraging sites has a positive effect on brood survival, whereas presence of off-road vehicles
has a negative effect. We studied chick behavior and survival using radio telemetry and direct observation and found that vehicles caused
mortality and affected behavior and resource use by oystercatcher chicks. We identified the source of mortality for 37 radio-tagged chicks.
Six (16%) were killed by vehicles, 21 (57%) by predators, and 10 (27%) by exposure and starvation. From 1995 to 2008, 25 additional
oystercatcher chicks were found dead, 13 (52%) killed by vehicles. Chicks on beaches closed to vehicles used beach and intertidal zones
more frequently than chicks on beaches open to vehicles. Chick predators included Great Horned Owls Bubo virginianus, Fish Crows
Corvus ossifragus, cats Felis catus, mink Mustela vison, raccoons Procyon lotor, and ghost crabs Ocypode albicans. The factors affecting
reproductive success differed between the incubation and chick-rearing stages.  Management actions that influence chick survival will have a larger effect on total productivity than actions affecting nest survival.

Study Area

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Factors affecting the reproductive success of American Oystercatchers Haematopus palliatus on the outer banks of North Carolina
Series title Marine Ornithology: Journal of Seabird Research and Conservation
Volume 43
Issue 1
Year Published 2015
Language English
Publisher Pacific Seabird Group
Contributing office(s) Coop Res Unit Atlanta
Description 11 p.
First page 37
Last page 47
Country United States
State North Carolina
Other Geospatial Cape Hatteras; Cape Lookout
Online Only (Y/N) N
Additional Online Files (Y/N) N
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