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A Survey of Breeding Golden Plover Within the Owenduff/Nephin Complex SPA, County Mayo

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A Survey of Breeding Golden Plover Within the Owenduff/Nephin Complex SPA, County Mayo ISSN 1393 – 6670 N A T I O N A L P A R K S A N D W I L D L I F E S ERVICE A SURVEY OF BREEDING GOLDEN PLOVER WITHIN THE WENDUFF EPHIN OMPLEX O /N C SPA, COUNTY MAYO Dave Suddaby & Cathal O’Brien I R I S H W I L D L I F E M ANUAL S 120 National Parks and Wildlife Service (NPWS) commissions a range of reports from external contractors to provide scientific evidence and advice to assist it in its duties. The Irish Wildlife Manuals series serves as a record of work carried out or commissioned by NPWS, and is one means by which it disseminates scientific information. Others include scientific publications in peer reviewed journals. The views and recommendations presented in this report are not necessarily those of NPWS and should, therefore, not be attributed to NPWS. Front cover, small photographs from top row: Limestone pavement, Bricklieve Mountains, Co. Sligo, Andy Bleasdale; Meadow Saffron Colchicum autumnale, Lorcan Scott; Garden Tiger Arctia caja, Brian Nelson; Fulmar Fulmarus glacialis, David Tierney; Common Newt Lissotriton vulgaris, Brian Nelson; Scots Pine Pinus sylvestris, Jenni Roche; Raised bog pool, Derrinea Bog, Co. Roscommon, Fernando Fernandez Valverde; Coastal heath, Howth Head, Co. Dublin, Maurice Eakin; A deep water fly trap anemone Phelliactis sp., Yvonne Leahy; Violet Crystalwort Riccia huebeneriana, Robert Thompson Main photograph: Looking towards Slieve Carr, Owenduff/Nephin Complex SPA, Dave Suddaby A survey of breeding Golden Plover within the Owenduff/Nephin Complex SPA, County Mayo Dave Suddaby & Cathal O’Brien BirdWatch Ireland, Eachléim, Clogher, Ballina, Co. Mayo Keywords: Golden Plover, Skylark, Meadow Pipit, breeding estimates, upland habitat, SPA, County Mayo Ireland Citation: Suddaby, D. & O’Brien, C. (2020) A survey of breeding Golden Plover within the Owenduff/Nephin Complex SPA, County Mayo. Irish Wildlife Manuals, No. 120. National Parks and Wildlife Service, Department of Culture Heritage and the Gaeltacht, Ireland The NPWS Project Officer for this report was: Seán Kelly ([email protected]) This IWM was edited by Áine O Connor ISSN 1393 – 6670 An tSeirbhís Páirceanna Náisiúnta agus Fiadhúlra 2020 National Parks and Wildlife Service 2020 An Roinn Cultúir, Oidhreachta agus Gaeltachta, 90 Sráid an Rí Thuaidh, Margadh na Feirme, Baile Átha Cliath 7, D07N7CV Department of Culture, Heritage and the Gaeltacht, 90 North King Street, Smithfield, Dublin 7, D07 N7CV Contents Executive Summary .............................................................................................................................................. i Acknowledgements .............................................................................................................................................. ii 1 Introduction ................................................................................................................................................... 1 2 Survey Area ................................................................................................................................................... 2 2.1 Site Description ................................................................................................................................... 2 2.2 Site Selection ........................................................................................................................................ 3 3 Methods ......................................................................................................................................................... 6 3.1 Breeding Birds ..................................................................................................................................... 6 3.2 Habitat Assessments ........................................................................................................................... 7 3.3 Data Interpretation and Analysis...................................................................................................... 9 4 Results .......................................................................................................................................................... 11 4.1 Coverage............................................................................................................................................. 11 4.2 Breeding Birds ................................................................................................................................... 11 4.2.1 Golden Plover................................................................................................................................ 11 4.2.2 Skylark and Meadow Pipit .......................................................................................................... 13 4.2.3 Red Grouse .................................................................................................................................... 15 4.3 Habitat Assessment .......................................................................................................................... 15 4.4 Habitat condition and the occurrence of breeding Golden Plover............................................. 16 5 Discussion .................................................................................................................................................... 19 6 Bibliography & Relevant Literature ......................................................................................................... 22 Appendix Habitat Assessment Summaries ............................................................................................. 24 IWM 120 (2020) Golden Plover survey, Owenduff/Nephin Complex SPA Executive Summary The Irish breeding population of Golden Plover Pluvialis apricaria, a species listed on Annex I of the Birds Directive, was estimated at 134 to 156 pairs following surveys between 2002 and 2004. From those surveys, the Owenduff/Nephin Complex Special Protection Area (SPA) (site code 4098) in County Mayo was identified and designated as an important breeding area for Golden Plover. Further surveys within this SPA in 2005 and 2006 estimated a breeding population of 60 to 67 pairs. These estimates were based on an extrapolation from single survey visits to up to 26 one-kilometre grid squares in both 2005 and 2006. There has been no systematic survey or population estimate for Golden Plover within SPA since these surveys. Robust data on population size, range and habitat use are essential to the development and implementation of effective conservation programmes. This report provides the results of a survey for breeding Golden Plover in the Owenduff/Nephin Complex SPA, based on the most cost-effective approach to providing a population estimate. The survey was completed during the 2019 breeding season using the same 27 one-kilometre grid squares identified and surveyed between 2005 and 2006. This survey followed the same transect routes within each one-kilometre square that were set during those previous surveys. In consideration that any changes in Golden Plover population may be habitat mediated, a repeat of the habitat assessments completed in 2005 and 2006 was also undertaken, using pre-determined 1 m2 quadrats along the established transect routes. Additionally, territorial Skylark Alauda arvensis and Meadow Pipit Anthus pratensis were recorded. This survey found five Golden Plover breeding territories within the 27 one-kilometre grid squares surveyed. All were recorded between 19 April and 16 May, and despite surveying through until 21 June 2019, no further territorial birds were detected. These findings indicate a breeding density of 0.25 Apparently Occupied Territories (AOTs) per kilometre-squared (0.25 AOT/km2) across the total surveyed area of the SPA (19.92 km2). Surveys in 2005 and 2006 estimated the density of Golden Plover at 0.37 AOT/km2 and 0.44 AOT/km2, respectively. These density estimates are considerably lower than those from a 2013-2015 survey in the Connemara Bog Complex SPA (1.35 AOT/km2). The results from this survey suggest that the total population of breeding Golden Plover within the repeated surveyed sites has declined by 37.5% (from a maximum eight AOTs in 2006 to five in 2019), and that the density of AOTs has declined by 43% (from a maximum of 0.44 AOT/km2 in 2006 to 0.25 AOT/km2 in 2019). However, these trends should be interpreted with caution as the survey methods differed between periods: two survey visits were completed to each one-kilometre grid square in 2019, while each square received only a single visit in both 2005 and 2006. Due to a lack of high quality data on habitat availability within the SPA, it was not possible to produce a robust estimate of the total breeding Golden Plover population within the SPA. Compared to the habitat assessments completed in 2005 and 2006, this survey found increased cover of shrub/heather in survey squares. As breeding Golden Plover do not utilise extensive or old stands of dense tall heather, the increased heather cover found may have impacted negatively upon the breeding population. This could perhaps, in part, explain the observed decline in the density of breeding Golden Plover pairs, and, if so, may continue to affect populations without changes in land management. While one may have expected an increase in shrub/heather cover to result in decreased Skylark abundance and increased Meadow Pipit abundance, this survey broadly indicated that Skylark increased while Meadow Pipit were stable. There is significant scope
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