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Publication - Research and analysis

Improving Our Understanding of Seabird Behaviour at Sea

Published
30 June 2022
From
Director-General Net Zero
Directorate
Marine Directorate
Part of
Energy, Environment and climate change, Marine and fisheries
ISBN
9781804352175

This project collated tracking data from five seabird species thought to be vulnerable to offshore wind farms. These data were analysed to understand whether seabird distribution data, usually undertaken in daytime, good weather conditions, were representative of behaviour in other conditions.

This document is part of a collection

View supporting documents Supporting documents

7.3 Appendix AC: Model summaries

7.3.1 Northern Gannet

Figure A17: For Gannet, HMM transition probabilities.
described in body of report
described in body of report
Figure A18: For Gannet, examples of states 1, 2 and 3 (floating, commuting and foraging/searching) identified for individuals at both colonies.
described in body of report
described in body of report
Figure A19: For Gannets, distributions of step length and turning angle at two sites: Alderney and Bass Rock for states 1, 2 and 3 (floating, commuting and foraging/searching); note due to quantity of information causing computational issues, models for Bass Rock were split annually – here we present the first two years of data (2010 and 2011), with information for the latter two (2012, 2015) provided in appendices.
described in body of report
described in body of report
Figure A20: For Gannets, distributions of step length and turning angle at two sites: Alderney and Bass Rock for states 1, 2 and 3 (floating, commuting and foraging/searching); note due to quantity of information causing computational issues, models for Bass Rock were split annually – here we present the other two years of data (2012 and 2015).
described in body of report

7.3.2 Lesser Black-backed Gull

Figure A21: For Lesser Black-backed Gulls, plot of transitions between states from a three-state model.
described in body of report
Figure A22: For Lesser Black-backed Gulls, distributions of step length and turning angles for each colony modelled and states 1, 2 and 3 (floating, commuting and foraging/searching).
described in body of report
described in body of report

7.3.3 Black-legged Kittiwake

Figure A23: For Kittiwake, plot of transitions between states.
described in body of report
Figure A24: For Kittiwake, states 1, 2 and 3 (floating, commuting and foraging/searching) identified for example birds at each colony.
described in body of report
described in body of report
described in body of report
Figure A25: For Kittiwake, step length and turning angle distributions for states 1, 2 and 3 (floating, commuting and foraging/searching) specified at (a) Isle of May, Colonsay, (c) Bempton Cliffs and (d) Orkney.
described in body of report
described in body of report

7.3.4 Razorbill

Figure A 26: For Razorbill, plot of transitions between states in relation to (a) Colonsay, (b) Puffin Island and (c) Isle of May.
described in body of report
Figure A27: For Razorbills, comparison of non- TDR and TDR HMMs for Razorbills at Colonsay (black = state 1, floating, red = state 2, commuting, green = state 3, foraging/searching).
described in body of report
Figure A28: For Razorbill, plot of transitions between states of models incorporating TDR dive data.
described in body of report
Figure A29: For Razorbill, states 1, 2 and 3 (floating, commuting and foraging/searching) identified for example birds at (a) Colonsay, (b) Puffin Island and (c) Isle of May.
described in body of report
described in body of report
Figure A30: For Razorbill, states 1, 2 and 3 (floating, commuting and foraging/searching) modelled with TDR data for example birds at Colonsay.
described in body of report
Figure A31: For Razorbill, step length and turning angle distributions for states 1, 2 and 3 (floating, commuting and foraging/searching) specified at (a) Colonsay, (b) Puffin Island and (c) Isle of May.
described in body of report
described in body of report
Figure A32: For Razorbills, step length and turning angle distributions for states 1, 2 and 3 (floating, commuting and foraging/searching) modelled with TDR dive data at Colonsay.
described in body of report

7.3.5 Common Guillemot

Figure A33: For Guillemot, plot of transitions between states.
described in body of report
Figure A34: For Guillemot, comparison of non- TDR and TDR HMMs at Colonsay (black = State 1, floating, red = State 2, commuting, green = State 3, foraging/searching).
described in body of report
described in body of report
Figure A35: For Guillemot, plot of transitions between states of models incorporating TDR dive data.
described in body of report
Figure A36: For Guillemot, states 1, 2 and 3 (floating, commuting and foraging/searching) identified for example birds at each colony.
described in body of report
described in body of report
Figure A37: For Guillemots, states 1, 2 and 3 (floating, commuting and foraging/searching) modelled with TDR data for corresponding example birds at each colony.
described in body of report
Figure A38: For Guillemot, step length and turning angle distributions for states 1, 2 and 3 (floating, commuting and foraging/searching) at (a) Colonsay
described in body of report
described in body of report
Figure A39: For Guillemot, step length and turning angle distributions for the states 1, 2 and 3 (floating, commuting and foraging/searching) specified modelled with TDR dive data at (a) Colonsay and (b) Fowlsheugh.
described in body of report

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