Parental resource allocation among offspring varies with increasing brood age in Black-legged Kittiwakes Rissa tridactyla

Robertson, G. S., Bolton, M. and Monaghan, P. (2015) Parental resource allocation among offspring varies with increasing brood age in Black-legged Kittiwakes Rissa tridactyla. Bird Study, 62(3), pp. 303-314. (doi:10.1080/00063657.2015.1040370)

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Abstract

Capsule: Black-legged Kittiwakes Rissa tridactyla breeding at a North Sea colony allocated more resources to younger chicks with increasing brood age.<p></p> Aims: Examine how feeding, attendance and resource allocation change with increasing brood age and how allocation of feeds affects growth rate and fledging success.<p></p> Methods: Broods of two were observed on Coquet Island to compare feeding rates and fledging success between chicks of different hatching order.<p></p> Results: Growth and feeding rates were similar between chicks of different hatching order. The relationship between growth and feeding rate may have differed between siblings, although this relationship was not strong. Feeding rate per brood and nest attendance decreased nonlinearly as brood age increased. First-hatched chicks were fed more frequently at the beginning of multiple feeds and received a higher proportion of feeds during early chick-rearing. However, during late chick-rearing second-hatched chicks received proportionally more feeds.<p></p> Conclusion: Parents reduced overall feeding rate as brood age increased, while increasing the proportion of resources allocated to younger offspring. This may explain general similarities in growth rate and fledging success between chicks of different hatching order. By considering resource allocation throughout development we can better understand parental investment strategies in asynchronous species.<p></p>

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Bolton, Dr Mark and Monaghan, Professor Pat and Robertson, Miss Gail
Authors: Robertson, G. S., Bolton, M., and Monaghan, P.
College/School:College of Medical Veterinary and Life Sciences > Institute of Biodiversity Animal Health and Comparative Medicine
College of Medical Veterinary and Life Sciences > School of Life Sciences
Journal Name:Bird Study
Publisher:Taylor and Francis
ISSN:0006-3657
ISSN (Online):1944-6705
Copyright Holders:Copyright © 2015 The Authors
First Published:First published in Bird Study 62(3):303-0314
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
552641NERC DTG 2010 - 2014: FBLSMarjorie BilsboroughNatural Environment Research Council (NERC)NE/I528369/1MVLS FINANCE