The importance of nonnative Pacific oyster reefs as supplementary feeding areas for coastal birds on estuary mudflats

Authors: Herbert, R.J.H., Davies, C., Bowgen, K., hatton, J. and Stillman, R.

http://eprints.bournemouth.ac.uk/31069/

Journal: Aquatic Conservation: Marine and Freshwater Ecosystems

Volume: 28

Pages: 1294-1307

Publisher: Wiley-Blackwell

ISSN: 1052-7613

DOI: 10.1002/aqc.2938

1. A combined empirical and modelling approach was used to investigate the value of a Pacific oyster reef to feeding shorebirds and to observe and predict the impact of reef clearance on bird populations in the Colne Estuary, a protected area in south‐east England. Macro‐invertebrate biomass and numbers of feeding birds were measured on a Pacific oyster reef, an adjacent uncolonized mudflat, and an area of mudflat that had been cleared of oysters 6 months previously. These data were used to parameterize an individual‐basedmodel (MORPH) to predict the impact of clearance of the reef on winter bird survival. Feeding success and intake rates of Eurasian oystercatcher, Eurasian curlew, and Eurasian common redshank were also recorded during the course of a winter.

2. Themacro‐invertebrate diversity and biomass within both the oyster reef and the cleared area were significantly greater than the adjacent uncolonized mudflat. The density and biomass of large invertebrate prey in the mudflat were low, yet the Pacific oyster reef hadmuch higher densities and biomass of large prey, especially annelids and shore crabs.

3. The winter assemblage of feeding birds differed significantly between each of the areas. The mean total number of feeding birds was significantly greater on the uncolonized mudflat; however, mean peak counts, feeding success rate and prey intake rate of Eurasian oystercatcher were greater on the reef. Significantly greater intake rates and feeding success rates were also observed on the reef for Eurasian curlew, a species of conservation concern.

4. Field data and model predictions show that Pacific oyster reefs can provide valuable supplementary feeding areas for some shorebirds, yet other species avoided the reef. However, as estuaries vary in available feeding resources, it is important that the value of reefs and their management is determined regionally.

This data was imported from Scopus:

Authors: Herbert, R.J.H., Davies, C.J., Bowgen, K.M., Hatton, J. and Stillman, R.A.

http://eprints.bournemouth.ac.uk/31069/

Journal: Aquatic Conservation: Marine and Freshwater Ecosystems

Volume: 28

Issue: 6

Pages: 1294-1307

eISSN: 1099-0755

ISSN: 1052-7613

DOI: 10.1002/aqc.2938

© 2018 The Authors. Aquatic Conservation: Marine and Freshwater Ecosystems Published by John Wiley & Sons Ltd A combined empirical and modelling approach was used to investigate the value of a Pacific oyster reef to feeding shorebirds and to observe and predict the impact of reef clearance on bird populations in the Colne Estuary, a protected area in south-east England. Macro-invertebrate biomass and numbers of feeding birds were measured on a Pacific oyster reef, an adjacent uncolonized mudflat, and an area of mudflat that had been cleared of oysters 6 months previously. These data were used to parameterize an individual-based model (MORPH) to predict the impact of clearance of the reef on winter bird survival. Feeding success and intake rates of Eurasian oystercatcher, Eurasian curlew, and Eurasian common redshank were also recorded during the course of a winter. The macro-invertebrate diversity and biomass within both the oyster reef and the cleared area were significantly greater than the adjacent uncolonized mudflat. The density and biomass of large invertebrate prey in the mudflat were low, yet the Pacific oyster reef had much higher densities and biomass of large prey, especially annelids and shore crabs. The winter assemblage of feeding birds differed significantly between each of the areas. The mean total number of feeding birds was significantly greater on the uncolonized mudflat; however, mean peak counts, feeding success rate and prey intake rate of Eurasian oystercatcher were greater on the reef. Significantly greater intake rates and feeding success rates were also observed on the reef for Eurasian curlew, a species of conservation concern. Field data and model predictions show that Pacific oyster reefs can provide valuable supplementary feeding areas for some shorebirds, yet other species avoided the reef. However, as estuaries vary in available feeding resources, it is important that the value of reefs and their management is determined regionally.

This data was imported from Web of Science (Lite):

Authors: Herbert, R.J.H., Davies, C.J., Bowgen, K.M., Hatton, J. and Stillman, R.A.

http://eprints.bournemouth.ac.uk/31069/

Journal: AQUATIC CONSERVATION-MARINE AND FRESHWATER ECOSYSTEMS

Volume: 28

Issue: 6

Pages: 1294-1307

eISSN: 1099-0755

ISSN: 1052-7613

DOI: 10.1002/aqc.2938

The data on this page was last updated at 04:58 on April 25, 2019.