Rock armour for birds and their prey: ecological enhancement of coastal engineering

Naylor, L. A. , MacArthur, M., Hampshire, S., Bostock, K., Coombes, M. A., Hansom, J., Byrne, R. and Folland, T. (2017) Rock armour for birds and their prey: ecological enhancement of coastal engineering. Proceedings of the Institution of Civil Engineers: Maritime Engineering, 170(2), pp. 67-82. (doi:10.1680/jmaen.2016.28)

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Abstract

The authors present key design, construction and ecological enhancement criteria for sustainable coastal defence structures at Hartlepool, UK, a high-energy wave climate. Such ‘ecologically favourable’ coastal defences fulfil the habitats directive and key engineering and cost criteria. Bird, rocky intertidal ecological and biogeomorphological data underpin recommendations for ‘passive’ enhancement mitigation to maximise ecological potential involving rock armour material choice (partially enhanced) and its smart positioning (enhanced). Within 12–18 months of installation, key intertidal species (e.g. limpets, barnacles, fucoid seaweeds) had successfully colonised the rock revetment, matching the initial baseline biotope. However, species abundance and overall mobile and sessile species were not significantly different between the two enhanced treatments after 12–18 months. Importantly, key prey species (the limpet, Patella vulgata) on enhanced rock armour showed statistically significant abundances similar to the baseline shore platform and significantly higher than partially enhanced rock armour. These preliminary data show that well-chosen rock armour material and boulder enhancement using positioning can match baseline biotope conditions in 12–18 months and that for some key prey species, positioning-enhanced rock armour rapidly matches baseline conditions. This facilitates rapid rock revetment colonisation, enabling good recruitment of food species and favourable conditions for internationally designated waterbird species.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Hansom, Dr Jim and Macarthur, Mairi and Naylor, Dr Larissa
Authors: Naylor, L. A., MacArthur, M., Hampshire, S., Bostock, K., Coombes, M. A., Hansom, J., Byrne, R., and Folland, T.
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Journal Name:Proceedings of the Institution of Civil Engineers: Maritime Engineering
Publisher:ICE Publishing
ISSN:1741-7597
ISSN (Online):1751-7737
Published Online:22 December 2017
Data DOI:10. 5525/gla.researchdata.552

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
708431EPSRC: Institutional Sponsorship 2015 - University of GlasgowMiles PadgettEngineering and Physical Sciences Research Council (EPSRC)EP/N508792/1VPO VICE PRINCIPAL RESEARCH & ENTERPRISE
720321A Decision Framework for Integrated Green Grey Infrastructure (IGGIframe)Larissa NaylorNatural Environment Research Council (NERC)NE/N017404/1SCHOOL OF GEOGRAPHICAL & EARTH SCIENCES