Victoria J. Hobson

Seasonal and Diurnal Patterns of Harbor Porpoise ( Phocoena phocoena ) Behavior and the Disruptive Effects of Vessel Presence in a High‐Traffic Coastal Habitat

Rachel Lennon, Shannon Merkle, Jonas Teilmann, Lorenzo Scala et autres

ABSTRACT Chronic anthropogenic activity is an ongoing threat to the marine environment and presents unique challenges in shallow, coastal habitats where harbor porpoises reside. Harbor porpoises have high metabolic needs and are highly susceptible to negative environmental factors; however, no long‐term studies …

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Insights obtained from a multidecadal citizen science scheme: grey seal (Halichoerus grypus) strandings in Cornwall and Isles of Scilly (2000–2020)

Helen Chadwick, James Barnett, Abby Crosby, Anthea Hawtrey-Collier et autres

Abstract Changes in abundance and distribution of marine top predators can indicate environmental change or anthropogenic pressure requiring management response. Here, we used an extensive dataset (21 years) to conduct a spatial and temporal analysis of grey seal strandings in Cornwall and …

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Balancing fishery and conservation: a case study of the barrel jellyfish Rhizostoma octopus in South Wales

Anna Elliott, Victoria J. Hobson, Kam W. Tang

In Wales, the barrel jellyfish Rhizostoma octopus is commercially harvested to produce high-value medical grade collagen. Although the fishery is presently not regulated, there are concerns how it may affect the leatherback turtle (Dermochelys coriacea), which preys on R. octopus in local …

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Appendix H. A figure showing frequency distributions of the daily speed of travel for each turtle.

Graeme C. Hays, Victoria J. Hobson, Julian D. Metcalfe, David Righton et autres

A figure showing frequency distributions of the daily speed of travel for each turtle.

Appendix D. A figure showing the difference in diel diving behavior by turtle A during different sections of the track.

Graeme C. Hays, Victoria J. Hobson, Julian D. Metcalfe, David Righton et autres

A figure showing the difference in diel diving behavior by turtle A during different sections of the track.

Appendix C. A figure showing the total proportion of time spent diving to >10 m in each hour and the mean dive depth for three latitudinal bands.

Graeme C. Hays, Victoria J. Hobson, Julian D. Metcalfe, David Righton et autres

A figure showing the total proportion of time spent diving to >10 m in each hour and the mean dive depth for three latitudinal bands.

Appendix F. A figure showing the daily speed of travel, mean duration of dives, the latitude, and the mean depth of dives for turtle I.

Graeme C. Hays, Victoria J. Hobson, Julian D. Metcalfe, David Righton et autres

A figure showing the daily speed of travel, mean duration of dives, the latitude, and the mean depth of dives for turtle I.

Appendix G. A figure showing the track of turtle B, situated off the north east coast of Brazil, overlaid onto images of sea surface temperature and chlorophyll concentration.

Graeme C. Hays, Victoria J. Hobson, Julian D. Metcalfe, David Righton et autres

A figure showing the track of turtle B, situated off the north east coast of Brazil, overlaid onto images of sea surface temperature and chlorophyll concentration.

Appendix E. A figure showing the daily speed of travel, mean duration of dives, the latitude, and the mean depth of dives for turtle C.

Graeme C. Hays, Victoria J. Hobson, Julian D. Metcalfe, David Righton et autres

A figure showing the daily speed of travel, mean duration of dives, the latitude, and the mean depth of dives for turtle C.

Appendix B. A figure showing the variation in diel dive index at different latitudes for nine turtles.

Graeme C. Hays, Victoria J. Hobson, Julian D. Metcalfe, David Righton et autres

A figure showing the variation in diel dive index at different latitudes for nine turtles.

Appendix A. A description of turtle tracking and diving behavior.

Graeme C. Hays, Victoria J. Hobson, Julian D. Metcalfe, David Righton et autres

A description of turtle tracking and diving behavior.

Options for modulating intra-specific competition in colonial pinnipeds: the case of harbour seals ( Phoca vitulina ) in the Wadden Sea

Rory P. Wilson, Nikolai Liebsch, Agustina Gómez‐Laich, W Kay et autres

Colonial pinnipeds may be subject to substantial consumptive competition because they are large, slow-moving central place foragers. We examined possible mechanisms for reducing this competition by examining the diving behaviour of harbour seals (Phoca vitulina) after equipping 34 seals (11 females, 23 …

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