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A Valuation of the Chichester Harbour Provisioning Ecosystem Services Provided by Shellfish

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Rpep A valuation of the Chichester Harbour Provisioning Ecosystem Services provided by shellfish Report for Sussex IFCA and the Environment Agency Title: A valuation of the Chichester Harbour Provisioning Ecosystem Services provided by shellfish Date: January 25th 2018 Authors: Chris Williams, William Davies and Jake Kuyer Client: Sussex Inshore Fisheries and Conservation Authority (SxIFCA) NEF Consulting is the consultancy arm of the leading UK think tank, New Economics Foundation. We help to put new economic ideas into practice. TheNew content Economicss of this report Foundation can be shared isfreely the within UK’s the only organisation people named-powered above as think the client tank.. However, please contact us if you would like to publish the report, or extracts from the report, on a websiteThe Foundation or in any other way.works Unless to explicitlybuild a agreed new otherwise,economy all where publishing people rights remainreally with take NEFcontrol. Consulting. NEF Consulting Limited New Economics Foundation 10 Salamanca Place London SE1 7HB www.nefconsulting.com Tel: 020 7820 6361 [icon] Contents 1. Background and context …………………………………………………………………….…4 Chichester harbour ...................................................................................................................... 5 Conservation significance and status ........................................................................................ 5 Shellfishery context ...................................................................................................................... 5 2. The fishery ..................................................................................................................................... 9 Commercial species ......................................................................................................................... 9 The native oyster fishery ............................................................................................................... 10 3. Water quality issues ................................................................................................................... 14 The Water Framework Directive (WFD) .................................................................................... 14 Classification of shellfish beds in Chichester Harbour ............................................................. 16 Water treatment options ……………………………………………………………………….…..20 4. Valuation ..................................................................................................................................... 21 5. Ecosystem Services (ES) ............................................................................................................ 22 Millenium Ecosystem Assessment (MEA) ........................................................................... 23 Ecosystem services provision by shellfish .................................................................................. 24 Description of key bivalve shellfish ecosystem services ...................................................... 26 6. Methodology ............................................................................................................................... 29 Calculating Direct / Indirect GVA ...................................................................................... 29/30 Scenario development ............................................................................................................... 31 7. Results .......................................................................................................................................... 32 Scenario 1: Do nothing: (deterioration of beds, total prohibition of all beds within the harbour) ....................................................................................................................................... 32 Scenario 2: Improvement of all beds to class C ...................................................................... 32 Scenario 3: Improvement of all beds to class B ...................................................................... 33 Scenario 4: Improvement of all beds to class A ..................................................................... 34 Scenario 5: Graded improvements with each bed increasing by one classification ......... 35 8. Conclusions ................................................................................................................................. 37 3 [icon] 1. Background and context Context A number of EU and national regulatory drivers are significant for improving the marine environment. These include the EU Marine Strategy Framework Directive (MSFD), the EU Water Framework Directive (WFD)1, the EU Habitats and Birds Directives and overarching vision statements such as the UK Marine Policy Statement and English legislation including the Inshore Fisheries and Conservation Authority (IFCA) byelaws and the South Marine Plan. The UK Government aims to have clean, healthy, safe, productive and biologically diverse oceans and seas.i It is within this context that this research is situated, aiming to evaluate and value the socio- economic and environmental benefits of improving water quality (e.g. by reducing the amount of faecal contamination) in terms of Chichester Harbour shellfish beds using an ecosystem services framework. This research aims to contribute to the promotion of the wider value of UK shellfish waters, using Chichester Harbour as a case study. By presenting a narrative of the wider value and ecosystem services provided by shellfish beds, and modelling the benefits of water quality improvements for the provisioning services of shellfish beds, it is possible to demonstrate that it is worth investing in better water quality and shellfish productivity to obtain wide societal benefits. Due to the growing recognition of the ecosystem services provided by suspension-feeding bivalves (such as oysters, mussels and clams), estuarine restoration projects to support natural remediation (water clarity improvements, reduction of nutrient loading / eutrophication, filtration, buffering against algal blooms) may notably improve water quality and enhance resilience of the estuarine ecosystem. Due to their wide tolerance of turbidity, oysters may represent the most desirable type of bivalve for restoration of estuarine ecosystems.ii Improving the evidence base regarding the value of shellfish is of crucial importance to marine and coastal regulators such as the Environment Agency (EA) and Inshore Fisheries and Conservation Authorities (IFCAs). The evidence and model provided in this report can be integrated as a supporting tool for cost-benefit analysis (CBA) when considering possible regulatory and policy interventions, as well as making the case for investment in natural systems. 1 The Shellfish Waters Directive was repealed in 2013, and subsumed under the WFD. 4 [icon] Background - Chichester harbour Chichester Harbour is a large estuary and natural harbour located to the south west of the city of Chichester, comprising around 44km2 of navigable water, the vast majority of which is intertidal. It is one of four natural harbours in the region, together with Portsmouth Harbour, Langstone Harbour and Pagham Harbour. The harbour and surrounding land has been managed by Chichester Harbour Conservancy since 1971iii and the harbour area is one of the busiest in the country for recreational activity. It has a wide variety of marine habitats including extensive areas of estuarine flats, intertidal areas supporting eelgrass (Zostera spp.), saltmarshes as well as drift line vegetationiv. In recognition of the variety and quality of habitats and species found in the harbour, Chichester Harbour has a number of noteworthy national and international conservation designations, listed below. Conservation significance and status . Recognising its distinctive landscape qualities, Chichester Harbour was designated as an Area of Outstanding Natural Beauty (AONB) in 1964 under the National Parks and Access to the Countryside Act (1949).v . EU Natura 2000: Chichester Harbour is part of the Solent Maritime Special Area of Conservation (SAC – for numerous Annex I habitats and Annex II species)vi, and Chichester and Langstone Harbour Special Protected Area (SPA – designated for a wide range of bird species)vii making it a wetland of international importance. SACs and SPAs, which are designated European Marine Sites, can collectively be called Natura 2000 sitesviii . Chichester Harbour is designated as a Site of Special Scientific Interest (SSSI)ix. The tidal waters of Chichester Harbour are designated as a Bass Nursery Areax. Chichester and Langstone Harbours are also designated wetlands under RAMSARxi. Shellfishery context Throughout their European range, native oyster populations have experienced an acute decline from their late 19th and early 20th century’s high point although some areas still support viable (although dramatically reduced) fisheries. The cause of the decline has been due to over-exploitation, habitat loss, environmental and anthropogenic pressure stemming from both pollution and disease.xii Oyster reefs in particular are one of the most degraded estuarine habitats globally (over 85% of natural oyster reef habitat have been lost globally in the past 130 years)xiii. 5 [icon] Chichester Harbour has supported a population of native oysters (Ostrea edulis) since records began. The oyster population is thought to be part of the wider Solent
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