Report 468
A comparison of trends and geographical variation in mammal abundance in the Breeding Bird Survey and the National Gamebag Census
(2012)
Noble, D.G., Aebischer, N.J., Newson, S.E., Ewald, J.A. and Dadam, D.
This work is an element of the addendum to the JNCC-BTO Monitoring of Birds and the Environment contract 2010/11-2015/16. This report covers two annual monitoring schemes for mammals, each reporting on a suite of mammal species that overlap in scheme coverage and allow patterns of temporal and spatial change to be compared.
 

Introduction

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In the UK, monitoring schemes and surveys for mammals vary markedly in methodologies and geographical and temporal extent among species, mainly due to the specialised protocols required to detect and identify most species. In this report, we compare results from two very different current annual monitoring schemes – the BTO/JNCC/RSPB Breeding Bird Survey (BBS) and the GWCT National Gamebag Census (NGC). Both schemes cover the entire UK, have been running for at least 15 years, and provide quantitative measures of abundance for multiple species, with considerable but not complete overlap in species coverage. This makes it possible to compare both temporal and geographic patterns of abundance and to explore possibilities for combining results across the two schemes.
 
 
ISSN 0963 8091
 
Please cite as: Noble, D.G., Aebischer, N.J., Newson, S.E., Ewald, J.A. and Dadam, D., (2012), A comparison of trends and geographical variation in mammal abundance in the Breeding Bird Survey and the National Gamebag Census, JNCC Report 468, ISSN 0963 8091