Displacement assessment during the breeding season Tom Evans SNCB - - PowerPoint PPT Presentation

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Aug 21, 2023 306 likes •378 views

Displacement assessment during the breeding season Tom Evans SNCB Matrix Approach Joint Statutory Nature Conservation Bodies (SNCB) Interim Displacement Advice Note (2017) Calculates displacement mortality only, not impacts

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Displacement assessment during the breeding season

Tom Evans

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SNCB ‘Matrix Approach’

Joint Statutory Nature Conservation

Bodies (SNCB) Interim Displacement Advice Note (2017)

– Calculates displacement mortality only, not impacts on productivity – Assumes a certain proportion of birds

bserved in development footprint plus a buffer

(2 km standard) are displacement – Then assumes a mortality rate for birds displaced – Present a range of displacement and mortality rates

http://archive.jncc.gov.uk/pdf/Joint_SNCB_Interim_Displacement _AdviceNote_2017.pdf

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Individual-based models of displacement

Searle, K., Mobbs, D., Butler, A., Bogdanova, M.,

Freeman, S., Wanless, S. and Daunt, F. (2014) Population consequences of displacement from proposed offshore wind energy developments for seabirds breeding at Scottish SPAs

– Requires a displacement rate – Effects on adult annual survival (mortality) and productivity – Models both barrier and displacement effects – Individual-based model to predict the time/energy budgets of breeding seabirds during the chick-rearing period – Optimal foraging theory – Uses GPS tracking data or density decay functions

https://www2.gov.scot/Topics/marine/marineenergy/Research/SB7

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SeabORD displacement assessment tool

K R Searle, D C Mobbs, A Butler, R W Furness, M N

Trinder and F Daunt. (2018). Finding out the Fate of Displaced Birds

– User friendly tool (SeabORD) – Refinements to Searle et al. (2014) model – Method for translating observations at sea to average demographic consequences

https://data.marine.gov.scot/dataset/finding-out-fate-displaced-birds

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Strategic Environmental Assessment North Seas Energy (SEANSE): Scottish Waters East Region Regional Sectoral Marine Plan Strategic Ornithology Study

Francis Daunt, Kate Searle, Deena Mobbs, Mark Trinder, Adam Butler, Peter G.H. Evans, James Waggitt

Ran both the Matrix Approach and SeabORD for the same scenarios SeabORD leads to higher equivalent mortality rates for displaced birds than those currently advised for use with the Matrix Approach

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Improving estimates of seabird body- mass survival rates

Francis Daunt, Kate Searle, Richard Howells, Mike Harris and Sarah Wanless (Centre for Ecology & Hydrology) Zhou Fang, David Elston (Biomathematics and Statistics Scotland)

Estimated the relationship between mass at the end of the breeding season and over-wintering survival probability Used recapture/resighting data from Isle of May for key species Found evidence for a positive relationship between end-

f-breeding season body mass and the survival of puffins

with less evidence of an effect in kittiwakes, guillemots and razorbills. Time Mass

Start of breeding season End of breeding season