Breeding farmland birds and the role of habitats created under agri-environment schemes

File Description SizeFormat 
McHugh-2015-PhD.pdfThesis6.87 MBAdobe PDFView/Open
Title: Breeding farmland birds and the role of habitats created under agri-environment schemes
Authors: Mc Hugh, Niamh
Item Type: Thesis or dissertation
Abstract: In this thesis, I aim to assess how farmland birds use insect-rich agri-environment scheme (AES) foraging habitats during the breeding season and how such birds might benefit from them. It is particularly focused on how the coverage and quality (measured by insect food levels and food accessibility) of AES habitats influence territory selection, foraging activities and breeding success. The thesis begins by explaining why farmland birds have declined, reviewing how AES may help reverse these trends, along with outlining why AES may fail to benefit breeding birds (Chapter one). I then investigated whether the addition of wildflowers to AES margins, boundary type, crop type, chick food availability or accessibility influenced the foraging activity of insectivores, mixed diet species and the passerine community in general (Chapter two). Next, I wanted to find out if territory selection by a declining farmland bird the yellowhammer Emberiza citronella related to the quantity of AES habitat available; models also accounted for chick food abundance, landscape diversity and nest site features (Chapter three). Subsequently I investigated how the availability of AES can affect chick diet and survival using the Eurasian tree sparrow Passer monatus as a focus species. I compared the abundance and diversity of tree sparrow chick food items between nest boxes with and without access to AES habitats aimed at foraging birds (Chapter four). I then documented whether tree sparrow productivity was limited by the availability of such invertebrate-rich foraging habitat (Chapter five). As the majority of AES studies use only short-term data sets, my final data chapter aimed to address this by linking trends in yellowhammer and common chaffinch Fringilla coelebs nest success to the total chick food abundance of available arable and AES habitats over an 10 year period (Chapter six). The thesis concludes by considering future research directions of AES and farmland bird studies in the United Kingdom (Chapter seven).
Content Version: Open Access
Issue Date: Apr-2015
Date Awarded: Dec-2015
Supervisor: Knight, Andrew
Holland, John
Leather, Simon
Sponsor/Funder: Biotechnology and Biological Sciences Research Council (Great Britain)
Game & Wildlife Conservation Trust
Natural England (Agency)
Department: Life Sciences
Publisher: Imperial College London
Qualification Level: Doctoral
Qualification Name: Doctor of Philosophy (PhD)
Appears in Collections:Life Sciences PhD theses

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Creative Commonsx