Communal roosting behaviour of the black kite (Milvus migrans govinda) in an urban metropolis

Communal roosting behaviour of the black kite (Milvus migrans govinda) in an urban metropolis Research on raptors in general in India is scanty, and it is practically non-existent on black kites (Milvus migrans govinda) which are the major scavenging raptor in many urban areas. The aim of this study was to analyse the seasonal abundance and roosting behaviour of black kites in an urban metropolis. Data on the abundance and behaviour of roosting black kites in this setting were collected using evening roost counts and ad-libitum sampling, respectively. Analysis was performed using separate generalized linear models considering roosting kite abundance, number of black kites arriving to roost and number of black kites showing pre-roosting display as response variables, respectively. We found that black kites roosted communally and that their number varied in different years and seasons, with the abundance highest in the summer and lowest during the winter. Pre-roosting displays also varied seasonally, being highest during the monsoon and at a minimum in the winter. In our urban setting, black kites arrived at the roosting sites mostly after sunset, and their arrival was influenced by sunset time, temperature, relative humidity and season. Some behavioural aspects of black kites within the roosts were also documented. This is the first quantitative assessment of roosting black kite abundance in Kolkata, India, and our data provide insight on the roosting behaviour of these birds relative to various environmental parameters. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Ethology Springer Journals

Communal roosting behaviour of the black kite (Milvus migrans govinda) in an urban metropolis

Communal roosting behaviour of the black kite (Milvus migrans govinda) in an urban metropolis

J Ethol (2017) 35:269–277 DOI 10.1007/s10164-017-0516-x ARTICLE Communal roosting behaviour of the black kite (Milvus migrans govinda) in an urban metropolis 1,2 3 2 • • Subhendu Mazumdar Dipankar Ghose Goutam Kumar Saha Received: 7 October 2016 / Accepted: 8 April 2017 / Published online: 10 May 2017 Japan Ethological Society and Springer Japan 2017 Abstract Research on raptors in general in India is scanty, roosting behaviour of these birds relative to various envi- and it is practically non-existent on black kites (Milvus ronmental parameters. migrans govinda) which are the major scavenging raptor in many urban areas. The aim of this study was to analyse the Keywords Milvus migrans govinda  Roost count seasonal abundance and roosting behaviour of black kites Pre-roosting display  Kolkata  Sunset in an urban metropolis. Data on the abundance and beha- Weather parameters viour of roosting black kites in this setting were collected using evening roost counts and ad-libitum sampling, respectively. Analysis was performed using separate gen- Introduction eralized linear models considering roosting kite abundance, number of black kites arriving to roost and number of black ‘Communal roosts’ are sites where various individuals of kites showing pre-roosting display as response variables, the same species gather to spend the night (Newton 1979). respectively. We found that black kites roosted commu- These sites have been repeatedly identified as highly vul- nally and that their number varied in different years and nerable locations as they attract many birds and often seasons, with the abundance highest in the summer and require adequate conservation measures (Donazar et al. lowest during the winter. Pre-roosting displays also varied 1996). Communal roosting behaviour and activity budgets seasonally, being highest during the monsoon and at a in many avian species are influenced by day length, light minimum in the winter. In our urban...
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Publisher
Springer Japan
Copyright
Copyright © 2017 by Japan Ethological Society and Springer Japan
Subject
Life Sciences; Zoology; Behavioral Sciences; Animal Ecology; Evolutionary Biology
ISSN
0289-0771
eISSN
1439-5444
D.O.I.
10.1007/s10164-017-0516-x
Publisher site
See Article on Publisher Site

Abstract

Research on raptors in general in India is scanty, and it is practically non-existent on black kites (Milvus migrans govinda) which are the major scavenging raptor in many urban areas. The aim of this study was to analyse the seasonal abundance and roosting behaviour of black kites in an urban metropolis. Data on the abundance and behaviour of roosting black kites in this setting were collected using evening roost counts and ad-libitum sampling, respectively. Analysis was performed using separate generalized linear models considering roosting kite abundance, number of black kites arriving to roost and number of black kites showing pre-roosting display as response variables, respectively. We found that black kites roosted communally and that their number varied in different years and seasons, with the abundance highest in the summer and lowest during the winter. Pre-roosting displays also varied seasonally, being highest during the monsoon and at a minimum in the winter. In our urban setting, black kites arrived at the roosting sites mostly after sunset, and their arrival was influenced by sunset time, temperature, relative humidity and season. Some behavioural aspects of black kites within the roosts were also documented. This is the first quantitative assessment of roosting black kite abundance in Kolkata, India, and our data provide insight on the roosting behaviour of these birds relative to various environmental parameters.

Journal

Journal of EthologySpringer Journals

Published: May 10, 2017

References

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