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Lyme Bay - a Case Study: Measuring Recovery of Benthic Species, Assessing Potential Spill-Over Effects and Socio-Economic Changes

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Lyme Bay - a Case Study: Measuring Recovery of Benthic Species, Assessing Potential Spill-Over Effects and Socio-Economic Changes Lyme Bay - A case study: measuring recovery of benthic species, assessing potential spill-over effects and socio-economic changes Objective 1: Identification of indicator species for monitoring the recovery of Lyme Bay Final version 5th January 2009 Defra Contract No: MB101 Marine and Fisheries Science Unit, Nobel House, London Author details: E.L. Jackson MarLIN Biodiversity and Conservation Science Programme Manager [email protected] O. Langmead MarLIN Biodiversity and Conservation Science Programme Manager [email protected] M. Barnes MarLIN Information Officer [email protected] H. Tyler-Walters [email protected] K. Hiscock [email protected] The Marine Life Information Network® for Britain and Ireland (MarLIN) The Marine Biological Association of the United Kingdom The Laboratory Citadel Hill Plymouth, PL1 2PB www.marlin.ac.uk This report should be cited as: Jackson, E.L., Langmead, O., Barnes, M., Tyler-Walters, H. & Hiscock, K., 2008. Identification of indicator species to represent the full range of benthic life history strategies for Lyme Bay and the consideration of the wider application for monitoring of Marine Protected Areas. Report to the Department of Environment, Food and Rural Affairs from the Marine Life Information Network (MarLIN). Plymouth: Marine Biological Association of the UK. Defra Contract No. MB101 Milestone 2. 1 Disclaimer: The content of this report does not necessarily reflect the views of Defra, nor is Defra liable for the accuracy of information provided, or responsible for any use of the reports content. 2 Executive Summary The work presented in this report is part of a larger project funded by Defra which focuses on assessing the various changes that may ensue as a result of protection of a 60nm2 area of Lyme Bay to mobile fishing gear, both in ecological and economic terms. The ecological monitoring includes monitoring of representative indicator species of the reef to examine recoverability and to “assess the long-term effects of fishery area closures on long lived and sessile benthic species”. The current report outlines the selection of such indicator species for Lyme Bay and the wider application of this and alternative methods to monitoring MPAs. The method for selecting representative species employed both subjective selection (i.e. species were locked in for perceived reasons of economic value, public interest, ecological role) and a objective assessment of the range biological traits (biological characteristics exhibited by species, relating to life history and mode of life) relevant to recoverability and/or function. For the latter the benthic species list was matched to biological traits information using BIOTIC (Biological Traits Information Catalogue; www.marlin.ac.uk/biotic) and ordination methods employed to identify correlating traits and suggest categorical groupings for the species. By selecting representatives from the range of biological traits of species found in the area of interest (both relating to recoverability of the individual or population and more general lifestyle traits), the indicators can be used both to assess potential recovery and changes in ecosystem structure. In the latter case this maybe through an increase in structural biogenic/ecosystem engineering species and the secondary settlement of species such as echinoderms and crustaceans or changes in the trophic structure due to a movement from scavengers to suspension feeders. Selecting a range of species representative of different levels of recoverability should also allow short-term and long-term recovery (both in terms of occurrences and growth) to be monitored. Additionally monitoring species with high tolerance and high recoverability to physical disturbance may indicate other natural environmental variations. The application of these indicators in Lyme Bay and for monitoring other MPAs is discussed and alternative approaches considered. With the exception of the rare and scarce species, the other selected indicator species, where present are likely to be suitable for use in monitoring reef habitats in other Marine Protected Areas in the region using video and diver surveys. However, each MPA will have its own specific environmental conditions and the habitat features for which sites were designated are not always reef, therefore these selected indicator species will not always be the most representative. The wider application of the work presented in this report is in outlining a transferable method for selecting representative indicator species for a specific site. Such a method is particularly valuable in the absence of large amounts of data and of cause and effect studies highlighting which species are key to the functioning and integrity of the system. 3 Contents Page Executive Summary .......................................................................................................... 3 1 Introduction ................................................................................................................ 6 1.1 Project Background............................................................................................... 6 1.2 Methods for selecting indicator species................................................................. 7 1.3 Aims and Objective ............................................................................................... 9 2 Methods....................................................................................................................... 9 2.1 The Lyme Bay Study Area .................................................................................... 9 2.1.1 Lyme Bay Reef............................................................................................. 10 2.2 Data collation ...................................................................................................... 11 2.3 Filtering species .................................................................................................. 12 2.4 Traits analysis ..................................................................................................... 13 2.5 Recoverability traits............................................................................................. 16 2.6 Additional “lifestyle” traits .................................................................................... 18 3 Selected representative indicator species ............................................................. 20 4 Discussion ................................................................................................................ 25 4.1 Approach and selected indicators species .......................................................... 25 4.1.1 Application of indicator species in the Lyme Bay study................................ 27 4.1.2 Considerations of wider application of species and selection method.......... 29 5 Acknowledgements.................................................................................................. 31 6 References ................................................................................................................ 32 4 List of Figures Figure 1: Location of Lyme Bay, the area closed to mobile gear and previous voluntary closed areas. ..................................................................................................................... 10 Figure 2: Species filtering procedure and the number of species left after each step........ 13 Figure 3: Principal Component Analysis of the traits recorded for different species in Lyme Bay. ................................................................................................................................... 16 Figure 4 Time taken for selected species to reach maturity............................................... 26 List of Tables Table 1 The definition of analysed traits (source: www.marlin.ac.uk/biotic)....................... 14 Table 2: Codes and categories for the traits used in the analysis...................................... 15 Table 3: List of indicator species for rock and mixed substrata for Lyme Bay .................. 23 Table 4 Recorded occurrences of the selected indicator species in other MPAs in the South West........................................................................................................................ 29 5 1 Introduction 1.1 Project Background 1.1 Early in 2008 Defra released a Partial Regulatory Impact Assessment and Consultation on “measures to protect biodiversity in Lyme Bay from the impact of fishing with dredges and other towed gear”. Following this consultation Defra designated a 60nm2 closure to mobile fishing gears within Lyme Bay. The primary purpose for establishing the closed area is for the protection of marine biodiversity, namely, to ensure the structure of the reef system is maintained and to aid the recovery of the benthic habitats. 1.2 The work presented in this report is part of a larger project funded by Defra which focuses on assessing the various changes that may ensue as a result of protection, both in ecological and economic terms. In addition to monitoring the marine reef community as a whole, the monitoring of representative indicator species are required to examine recoverability and to “assess the long-term effects of fishery area closures on long lived and sessile benthic species”. Specifically the purpose of the project is to: 1. Identify and select a number of indicator species that represent the full range of life strategies used by benthic species in the study area[but selection of species
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