Assessment of Supporting Habitat Liverpool Docks Aug 2015
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Assessment of Supporting Habitat (Docks) for Use by Qualifying Features of Natura 2000 Sites in the Liverpool City Region Ornithology Report Report Ref: 4157.005 August 2015 Assessment of Supporting Habitat (Docks) for Use by Qualifying Features of Natura 2000 Sites in the Liverpool City Region Ornithology Report Document Reference: 4157.005 Version 3.0 August 2015 Prepared by: TEP Genesis Centre Birchwood Science Park Warrington WA3 7BH Tel: 01925 844004 Fax: 01925 844002 e-mail: [email protected] for: Merseyside Environmental Advisory Service First floor Merton House Stanley Road Bootle Merseyside L20 3DL Written: Checked: Approved: MW TR TR CONTENTS PAGE 1.0 EXECUTIVE SUMMARY .......................................................................................... 1 2.0 INTRODUCTION ...................................................................................................... 2 3.0 SURVEY METHODS .............................................................................................. 11 4.0 SUMMARY SURVEY FINDINGS ............................................................................ 17 5.0 CONCLUSIONS ..................................................................................................... 82 6.0 DISCUSSION OF IMPLICATIONS RELATING TO NATURA 2000 SITES.............. 83 7.0 REFERENCES & FURTHER READING ................................................................. 86 APPENDICES Appendix 1: Examples of Survey Sheets Appendix 2: Vantage Point Survey Coverage Appendix 3: Tabulated Raw Data Appendix 4: Protected Site Citations DRAWINGS G4157.004 Count Area Locations G4157.007 Bird Flight Lines April 2014 – October 2014 G4157.008 Bird Flight Lines November 2013 – March 2014 G4157.009 Mallard and Cormorant Flight Lines April 2014 – October 2014 G4157.010 Mallard and Cormorant Flight Lines November 2013 – March 2014 1.0 EXECUTIVE SUMMARY 1.1 TEP was commissioned in August 2013 to carry out non-breeding bird surveys of the active and inactive dock systems in Liverpool and Birkenhead to aid in updating the Environmental Baseline for the suite of Natura 2000 sites that are found in the Liverpool region. 1.2 The project has been carried out to fill crucial gaps in knowledge regarding use of the dock systems as supporting habitat by birds that are qualifying features in their own right, and / or as part of the waterbird assemblage for nearby Natura 2000 sites. These sites include the Mersey Narrows and North Wirral Foreshore SPA and Ramsar, the Mersey Estuary SPA and Ramsar and the Dee Estuary SPA and Ramsar sites. 1.3 The survey method was adapted from the WeBS core count methodology and entailed monthly visits between November 2013 and October 2014. Using a team of ornithologists it was possible for the entire dock system to be covered concurrently during each survey visit. Taking this approach enables greater insight into how birds use the docks and move between these areas and adjacent estuarine habitat. 1.4 A combination of transect routes and point counts were used to count all birds on the docks and flying over the docks. A count of all docks was undertaken at both high and low tide each month. Six one hour long vantage point surveys were also undertaken at both high tide and low tide to record any bird movements. 1.5 The survey results show that the docks are used by some birds associated with the Mersey Narrows and North Wirral Foreshore SPA and Ramsar, the Dee Estuary SPA and Ramsar and the Mersey Estuary SPA and Ramsar, including shelduck, redshank, black-tailed godwit and little gull. However, only low numbers and occasional usage of the docks by these species was recorded during the winter period. Increased usage of the docks by shelduck was observed during the spring period, particularly during April. The peak count of shelduck using the entire dock system was 41 individuals, equivalent to just below 1% of the Mersey Estuary SPA population. 1.6 The wintering bird assemblage for the SPA and Ramsar sites covers a larger number of species than those listed as qualifying features within the citation. Of the wintering bird assemblage species for these protected sites, curlew, lapwing, oystercatcher, redshank, turnstone, shelduck, great crested grebe, cormorant and little gull were recorded using the docks during the winter period. 1.7 Cormorant were regularly recorded fishing in most of the docks, with the largest numbers recorded on the West Float and East Float in Birkenhead (peak count: 35 individuals). The number supported by Birkenhead Docks is equal to 4.7% of the Mersey Narrows and North Wirral Foreshore SPA population. It is considered likely that the Birkenhead Docks provide supporting habitat for cormorant associated with the Mersey Narrows and North Wirral Foreshore SPA. 1.8 Great crested grebe were regularly observed to congregate at the eastern end of the East Float within the Birkenhead Docks, with a peak count of 12 individuals. This is equivalent to 60% of the Mersey Estuary SPA population. It is possible that the docks are functionally linked with the Mersey Estuary SPA in terms of their great crested grebe population. 1.9 Moderate usage of the Garston Docks by oystercatcher was recorded, with occasional large groups of this species roosting directly adjacent to the dock. A peak count of 210 oystercatcher was observed at Old Dock, equivalent to 7.7% of the 4157.005 August 2015 Version 3.0 1 Mersey Narrows and North Wirral Foreshore SPA population. It is considered that the Old Dock within Garston Docks provides supporting habitat for the Mersey Narrows and North Wirral Foreshore SPA oystercatcher population and potentially that of the Ribble and Alt Estuaries. 1.10 It is considered that the Liverpool Docks including Garston Docks, Brunswick Docks, Albert Docks and Princes Docks provide supporting habitat for the turnstone population that forms part of the winter bird assemblage for the Mersey Narrows and North Wirral Foreshore SPA. 2.0 INTRODUCTION 2.1 TEP was commissioned in August 2013 to carry out non-breeding bird surveys of the active and inactive dock systems in Liverpool and Birkenhead to aid in updating the Environmental Baseline for the suite of Natura 2000 sites that are found in the Liverpool city region. The survey comprises a full 12 months. 2.2 Initially, the project was delayed while a number of matters were resolved and survey commenced in November 2013 and continued until the end of October 2014. 2.3 A range of gaps in coverage for bird survey within the Natura 2000 sites has been identified by joint work with Natural England, RSPB, BTO and local volunteers. The crucial gaps in knowledge include use of the dock systems as supporting habitat by birds that are qualifying features in their own right, and / or as part of the waterbird assemblage. It is therefore necessary to fill in gaps in knowledge about use of the dock systems by birds. Survey Coverage 2.4 Figure 1 shows the total survey coverage for the survey work detailed within this report. The survey area extends from Garston docks in the south to the southern edge of Seaforth in the north on the east bank of the Mersey (Liverpool). On the western bank of the Mersey (Wirral) survey coverage included the QEII dock in the south at Eastham to the Birkenhead docks in the north. 4157.005 August 2015 Version 3.0 2 Figure 1: Survey area and Natura 2000 sites within the vicinity of the site. 4157.005 August 2015 Version 3.0 3 Natura 2000 Sites 2.5 The following Natura 2000 sites designated for birds are present within the vicinity of the Liverpool Docks: Mersey Narrows and North Wirral Foreshore SPA and Ramsar Sites Mersey Estuary SPA and Ramsar Sites Ribble and Alt Estuaries SPA and Ramsar Sites Mersey Narrows and North Wirral Foreshore SPA and Ramsar Sites 2.6 The Mersey Narrows and North Wirral Foreshore was designated as a Special Protection Area (SPA) and Ramsar site in July 2013. The boundaries of these sites are alike and this description covers both the SPA and Ramsar sites. These sites comprise a 2,078 ha area located at the mouths of the Mersey and Dee Estuaries. It comprises intertidal habitats at Egremont foreshore, man-made lagoons at Seaforth and the extensive mudflats of the North Wirral Foreshore. These protected sites are located approximately 300m from the Alfred Dock on the coast of Birkenhead at their closest point and are 20m from the Royal Seaforth Dock. 2.7 The SPA qualifies under Article 4.1 for being regularly used by 1% or more of the GB population of the following species: Bar-tailed godwit (non-breeding) Common tern (breeding) 2.8 In addition the 2013 citation states that the site is one of the most important locations in the UK for the following species: Little gull (non-breeding) Common tern (non-breeding) 2.9 The SPA also qualifies under Article 4.2 for being regularly used by 1% or more of the biogeographical population of the following species: Knot (non-breeding) 2.10 The populations of qualifying species supported by the Mersey Narrows and North Wirral Foreshore SPA as stated within the 2013 citation are presented in Table 2.1. Table 2.1. Populations of qualifying species and assemblages supported by the Mersey Narrows and North Wirral Foreshore SPA as stated within the 2013 citation (see Appendix 4). Species 5-yr peak mean % GB population % biogeographical (2004/05 – population 2008/09) Bar-tailed godwit 3,344 6.6 Common tern 177 pairs 1.8 (breeding) Common tern 1,475 - * (non-breeding) Little Gull 213 - * Knot 10,655 - 2.4 Wintering 32,366 - - Waterbirds Assemblage * No population estimate provided 4157.005 August 2015 Version 3.0 4 2.11 The SPA is also designated for its non-breeding bird assemblage, including cormorant, grey plover, sanderling, dunlin, redshank, oystercatcher and turnstone. 2.12 The Mersey Narrows and North Wirral Foreshore Ramsar site is a separate designation, although it is designated for the same species as the SPA. Mersey Estuary SPA and Ramsar Sites 2.13 On 30th June 2014 Natural England published an updated Conservation Objectives list for the Mersey Estuary SPA.