5 results on '"Ward, Robin M"'
Search Results
2. Energetic synchrony throughout the non-breeding season in common guillemots from four colonies
- Author
-
Buckingham, Lila, Daunt, Francis, Bogdanova, Maria I., Furness, Robert W., Bennett, Sophie, Duckworth, James, Dunn, Ruth E., Wanless, Sarah, Harris, Michael P., Jardine, David C., Newell, Mark A., Ward, Robin M., Weston, Ewan D., Green, Jonathan A., Buckingham, Lila, Daunt, Francis, Bogdanova, Maria I., Furness, Robert W., Bennett, Sophie, Duckworth, James, Dunn, Ruth E., Wanless, Sarah, Harris, Michael P., Jardine, David C., Newell, Mark A., Ward, Robin M., Weston, Ewan D., and Green, Jonathan A.
- Abstract
The non-breeding season presents significant energetic challenges to birds that breed in temperate or polar regions, with clear implications for population dynamics. In seabirds, the environmental conditions at non-breeding sites drive food availability and the energetic cost of regulatory processes, resulting in variation in diet, behaviour and energetics; however, very few studies have attempted to understand if and how these aspects vary between populations. We investigated whether non-breeding location influenced diet, behaviour and energetics in the common guillemot Uria aalge. We studied guillemots from four UK breeding colonies, two located on the west coast of Scotland and two on the east. We quantified non-breeding distribution, foraging behaviour and activity budgets of 39 individuals from July to March, using geolocation–immersion loggers and time-depth recorders, and used feather stable isotope signatures to infer diet during the post-breeding moult. We calculated energy expenditure and investigated whether the peak (an indicator of the potential vulnerability to marine threats) varied between colonies. Individuals were spatially segregated according to the coastline they breed on, with west coast guillemots distributed off the west coast of the UK and east coast guillemots distributed off the east coast. Diet and behaviour were more similar in guillemots that shared a breeding coastline than those that did not, as west coast guillemots foraged at a lower trophic level, spent less time diving and engaged in more pelagic foraging than east coast guillemots. However, energy expenditure was remarkably similar between colonies, peaking during late February/early March, indicating that, during our study period, there was high synchrony between colonies in the timing of potential vulnerability to marine threats. Therefore, any anthropogenic changes that result in decreased food availability or increased energy expenditure during late winter may have greater im
- Published
- 2023
3. BEST PRACTICES FOR USING DRONES IN SEABIRD MONITORING AND RESEARCH.
- Author
-
EDNEY, ALICE J., HART, TOM, JESSOPP, MARK J., BANKS, ALEX, CLARKE, LUCY E., CUGNIÈRE, LAURE, ELLIOT, KYLE H., MARTINEZ, IGNACIO JUAREZ, KILCOYNE, ALEXANDRA, MURPHY, MATTHEW, NAGER, RUEDI G., RATCLIFFE, NORMAN, THOMPSON, DANIELLE L., WARD, ROBIN M., and WOOD, MATT J.
- Subjects
BEST practices ,RARE birds ,SEA birds ,IMAGE analysis ,RESEARCH personnel ,REMOTE sensing - Abstract
Over the past decade, drones have become increasingly popular in environmental biology and have been used to study wildlife on all continents. Drones have become of global importance for surveying breeding seabirds by providing opportunities to transform monitoring techniques and allow new research on some of the most threatened birds. However, such fast-changing and increasingly available technology presents challenges to regulators responding to requests to carry out surveys and to researchers ensuring their work follows best practices and meets legal and ethical standards. Following a workshop convened at the 14th International Seabird Group Conference and a subsequent literature search, we collate information from over 100 studies and present a framework to ensure drone-seabird surveys are safe, effective, and within the law. The framework comprises eight steps: (1) Objectives and Feasibility; (2) Technology and Training; (3) Site Assessment and Permission; (4) Disturbance Mitigation; (5) Pre-deployment Checks; (6) Flying; (7) Data Handling and Analysis; and (8) Reporting. The audience is wide-ranging with sections having relevance for different users, including prospective and experienced drone-seabird pilots, landowners, and licensors. Regulations vary between countries and are frequently changing, but common principles exist. Taking-off, landing, and conducting in-flight changes in altitude and speed at ≥ 50 m from the study area, and flying at ≥ 50 m above ground-nesting seabirds/horizontal distance from vertical colonies, should have limited disturbance impact on many seabird species; however, surveys should stop if disturbance occurs. Compared to automated methods, manual or semi-automated image analyses are, at present, more suitable for infrequent drone surveys and surveys of relatively small colonies. When deciding if drone-seabird surveys are an appropriate monitoring method long-term, the cost, risks, and results obtained should be compared to traditional field monitoring where possible. Accurate and timely reporting of surveys is essential to developing adaptive guidelines for this increasingly common technology. [ABSTRACT FROM AUTHOR]
- Published
- 2023
4. Energetic synchrony throughout the non‐breeding season in common guillemots from four colonies
- Author
-
Buckingham, Lila, primary, Daunt, Francis, additional, Bogdanova, Maria I., additional, Furness, Robert W., additional, Bennett, Sophie, additional, Duckworth, James, additional, Dunn, Ruth E., additional, Wanless, Sarah, additional, Harris, Michael P., additional, Jardine, David C., additional, Newell, Mark A., additional, Ward, Robin M., additional, Weston, Ewan D., additional, and Green, Jonathan A., additional
- Published
- 2023
- Full Text
- View/download PDF
5. Interspecific variation in non-breeding aggregation: a multi-colony tracking study of two sympatric seabirds
- Author
-
Buckingham, Lila, Bogdanova, Maria I., Green, Jonathan A., Dunn, Ruth E., Wanless, Sarah, Bennett, Sophie, Bevan, Richard M., Call, Andrew, Canham, Michael, Corse, Colin J., Harris, Michael P., Heward, Christopher J., Jardine, David C., Lennon, Jim, Parnaby, David, Redfern, Chris P.F., Scott, Liz, Swann, Robert L., Ward, Robin M., Weston, Ewan D., Furness, Robert W., Daunt, Francis, Buckingham, Lila, Bogdanova, Maria I., Green, Jonathan A., Dunn, Ruth E., Wanless, Sarah, Bennett, Sophie, Bevan, Richard M., Call, Andrew, Canham, Michael, Corse, Colin J., Harris, Michael P., Heward, Christopher J., Jardine, David C., Lennon, Jim, Parnaby, David, Redfern, Chris P.F., Scott, Liz, Swann, Robert L., Ward, Robin M., Weston, Ewan D., Furness, Robert W., and Daunt, Francis
- Abstract
Migration is a widespread strategy for escaping unfavourable conditions during winter, but the extent to which populations that segregate during the breeding season aggregate during the non-breeding season is poorly understood. Low non-breeding season aggregation may be associated with higher likelihood of overlap with threats, but with fewer populations affected, whereas high aggregation may result in a lower probability of exposure to threats, but higher overall severity. We investigated non-breeding distributions and extent of population aggregation in 2 sympatrically breeding auks. We deployed geolocation-immersion loggers on common guillemots Uria aalge and razorbills Alca torda at 11 colonies around the northern UK and tracked their movements across 2 non-breeding seasons (2017-18 and 2018-19). Using 290 guillemot and 135 razorbill tracks, we mapped population distributions of each species and compared population aggregation during key periods of the non-breeding season (post-breeding moult and mid-winter), observing clear interspecific differences. Razorbills were largely distributed in the North Sea, whereas guillemot distributions were spread throughout Scottish coastal waters and the North, Norwegian and Barents Seas. We found high levels of aggregation in razorbills and a strong tendency for colony-specific distributions in guillemots. Therefore, razorbills are predicted to have a lower likelihood of exposure to marine threats, but more severe potential impact due to the larger number of colonies affected. This interspecific difference may result in divergent population trajectories, despite the species sharing protection at their breeding sites. We highlight the importance of taking whole-year distributions into account in spatial planning to adequately protect migratory species.
- Published
- 2022
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.