Download or read book The effect of weather conditions on the feeding behaviour of a diving bird the Common Guillemot Uria aalge written by S K. Finney and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed investigation of the effects of weather conditions on the feeding behaviour of a pursuit diving seabird, the Common Guillemot Uria aalge, was carried out during the chick-rearing period at a colony in southeast Scotland in 1997. There was no evidence that the rate at which adults brought back fish for their chicks was related to weather conditions but the type of prey delivered was affected with birds bringing in smaller sandeels Ammodytes marinus in stormy weather. This resulted in a significant decrease in the mean energy value of a prey load and in the overall rate of energy intake of chicks. The attendance behaviour of adults also varied in response to the prevailing weather conditions. The proportion of sites with chicks which had both adults present was significantly lower in stormy conditions indicating that, although the frequency at which Common Guillemots provisioned their chicks was not affected, birds were spending longer away foraging. Furthermore, information on diving behaviour collected using radio telemetry suggested that birds were working harder when conditions were bad with the number of dives in a bout, and hence the amount of time spent underwater, increasing significantly and the interval between consecutive diving bouts decreasing significantly. Analysis of long-term data on chick provisioning and adult attendance for the study colony indicated that the observed reductions in the mean energy value of loads and the proportion of chicks attended by both adults in stormy weather, which were evident in the 1997 data, were also apparent across years. If the current climate change prediction of an increase in the frequency and/or intensity of storms at mid to high latitudes proves correct, such trends could have marked energetic consequences for Common Guillemots in terms of increased foraging costs of adults and reduced energy intake of chicks.
Download or read book Weather and Bird Behaviour written by Norman Elkins and published by A&C Black. This book was released on 2010-01-29 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: This classic Poyser title, now in its third revised edition, discusses in depth the various ways in which weather conditions influence bird behaviour. Weather conditions affect food and water availability, decisions about when and how to migrate, timing and success of reproduction, flight style, and physical comfort. Birds display many adaptations in form and behaviour that help them to cope with changing weather conditions, and this fascinating book uses a great variety of examples to explore the subject in depth. The text is enhanced throughout with evocative line drawings, there are many useful tables and figures, and there is also an 8pp colour photograph section.
Download or read book Marine Ecosystems and Climate Variation written by Nils Chr. Stenseth and published by OUP Oxford. This book was released on 2005-05-19 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research level text focuses on the influence of climate variability on the marine ecosystems of the North Atlantic. The ecological impact of climate variability on population dynamics is addressed at the full range of trophic levels, from phytoplankton through zooplankton and fish to marine birds. Climate effects on biodiversity and community structure are also examined. 40 scientists from around the world synthesise what is currently known about how climate affects the ecological systems of the North Atlantic and then place these insights within a broader ecological perspective. Many of the general features of the North Atlantic region are also seen in other marine ecosystems as well as terrestrial and freshwater systems. The final section of the book makes these generalities more explicit, so as to stimulate communication and promote co-operation amongst researchers who may previously have worked in semi-isolation. The book comprises 5 main sections: background (general introduction, atmospheric and ocean climate of the North Atlantic, and modelling methodology), plankton populations (phytoplankton and zooplankton), fish and seabird populations, community ecology (phytoplankton, benthos and fish), and the final section consisting of six commentaries from scientists working in areas outside the North Atlantic marine sector. In order to enhance integration, a series of introductions link chapters and sections. Throughout the book, numerous examples highlight different aspects of ecology-climate interactions. They document recent progress and illustrate the challenges of trying to understand ecological processes and patterns in the light of climate variations.
Download or read book Turning Up the Heat written by Amy Mathews-Amos and published by DIANE Publishing. This book was released on 1999 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: The World Wildlife Fund (WWF) and the Marine Conservation Biology Institute (MCBI) present the full text of the report entitled "Turning up the Heat: How Global Warming Threatens Life in the Sea," written by Amy Mathews-Amos and Ewann A. Berntson. Scientific evidence suggests that marine species and ecosystems are already affected by global climate change. The consequences of global warming on marine life include the fact that some organisms cannot survive in warmer waters, while others may shift their distribution poleward.
Download or read book Biology of Marine Birds written by E. A. Schreiber and published by CRC Press. This book was released on 2001-08-16 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biology of Marine Birds provides the only complete summary of information about marine birds ever published. It analyzes their breeding biology, ecology, taxonomy, evolution, fossil history, physiology, energetics, and conservation. The book covers four orders of marine birds in detail and includes two summary chapters that address the biology of shorebirds and wading birds and their lives in the marine environment. Summary tables give detailed information on various aspects of their life histories, breeding biology, physiology and energetics, and demography. It provides a guide to ornithologists and students for research projects.
Download or read book Seabirds in the North East Atlantic written by Henry Häkkinen and published by Open Book Publishers. This book was released on 2023-08-08 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book was produced by the Zoological Society of London and the University of Cambridge with two aims: to assess seabirds’ vulnerability to climate change in the North-East Atlantic, and to identify potential conservation actions that could reduce this vulnerability. 'Seabirds in the North-East Atlantic' collates information from the scientific literature, non-governmental organisations’ reports, conservation practitioner input and online databases into a single volume, and provides a reference manual to assist conservation planning. It is intended to be used by anyone who wishes to identify climate change threats to seabirds; to compare threats between different areas of the North-East Atlantic; to start a quantitative climate change vulnerability assessment for a local population; or to review options for conservation action in response to climate change. This book stems from research published in December 2022, but assessments may be updated based on feedback and newly available information. To check for updates to our assessments, please visit our website at: www.ZSL.org/seabird-guidelines.
Download or read book Canadian Journal of Zoology written by and published by . This book was released on 2009-05 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tracking marine megafauna for conservation and marine spatial planning written by Jorge M. Pereira and published by Frontiers Media SA. This book was released on 2023-02-09 with total page 553 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Climate Change and Marine Top Predators written by Morten Frederiksen and published by Frontiers Media SA. This book was released on 2016-01-18 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate change affects all components of marine ecosystems. For endothermic top predators, i.e. seabirds and marine mammals, these impacts are often complex and mediated through trophic relationships. In this Research Topic, leading researchers attempt to identify patterns of change among seabirds and marine mammals, and the mechanisms through which climate change drives these changes.
Download or read book Ecology and Conservation of the Marbled Murrelet Brachyramphus Marmoratus in Central California written by Marcus Zachariah Peery and published by . This book was released on 2004 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wildlife Abstracts written by U.S. Fish and Wildlife Service and published by . This book was released on 1954 with total page 732 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Papers and Proceedings of the Royal Society of Tasmania written by Royal Society of Tasmania and published by . This book was released on 2008-10 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols.for 1878,1879,1881,1884 contain "List of fellows and members."
Download or read book Diving Energetics and Fine Scale Foraging Behaviour of Avian Divers and Their Capacity to Buffer Environmental Change written by Manfred Enstipp and published by . This book was released on 2005 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: Avian divers are confronted with a number of physiological challenges when foraging in cold water, especially at depth. Diving is believed to be particularly costly in cormorants (Phalacrocoracidae) because of their poor insulation and less efficient foot-propulsion. I used open-circuit respirometry to study the energetic requirements of two Phalacrocorax species, the European shag (P. aristotelis) and the double-crested cormorant (P. auritus) when diving in a shallow (1 m) and deep (10 m) dive tank. I also investigated the modifying effects of water temperature and feeding status on dive costs. My results indicate that the energetic costs during shallow diving in European shags and double-crested cormorants are comparable to other foot-propelled divers. Metabolic rate was significantly increased when diving to greater depth and at lower water temperatures, while feeding before diving increased metabolic rate, albeit not significantly. The strong effects of depth and water temperature on cormorant diving metabolic rate are most likely a consequence of their partially wettable plumage and their reduced plumage air volume, which makes them prone to heat loss and, hence, increases thermoregulatory costs. The energetic requirements of animals have to be satisfied by intake of resources from the environment. Hence, the quest for food is a central aspect of animal behavior. Although the study of seabird foraging behaviour has greatly profited from recent technological developments, we still know little about predator-prey interactions on a fine scale. I used an underwater video array to investigate the prey-capture behaviour of double-crested cormorants foraging on live rainbow trout (Oncorhynchus mykiss). I tested the effects of a variety of factors on the underwater foraging behaviour of cormorants and established a functional link between prey density and cormorant prey capture rate. Prey density and behaviour both significantly affected predator performance. At prey densities below 2-3 g fish m-3 birds increased their search time during a trial drastically, while prey-encounter rate was greatly decreased. When cormorants attacked shoaling rather than solitary trout, their capture success was significantly reduced, while pursuit duration was significantly increased. Seabird energetics and behaviour are typically studied on the individual or species level. However, if we want to understand how seabirds react to environmental changes, we have to consider entire communities. In the western North Sea, a large seabird assemblage critically depends on a single fish species, the lesser sandeel (Ammodytes marinus), which is also exploited by an industrial fishery. I developed an algorithm to test for the capacity of four seabird species during chick-rearing in Scotland to buffer a potential decline in sandeel abundance by increasing their foraging effort in various ways. My results show that under the conditions currently operating in this region shags and guillemots (Uria aalge) may have sufficient time and energy to allow them to increase their foraging effort considerably, while Kittiwakes (Rissa tridactyla) and gannets (Morus bassanus) appear more constrained by time and energy respectively. My study suggests that during chick-rearing gannets are working at the highest metabolic level of all species considered and hence, have the least physiological capacity to increase foraging effort. This indicates that gannets could potentially be very sensitive to a reduction in sandeel abundance. My thesis emphasises the importance of taking into account seabird energetics as well as fine scale behavioural requirements, when trying to develop management schemes for fisheries that will allow the coexistence of both seabirds and human fishery in a sustainable way.
Download or read book Modelling the Physiology Behaviour and Ecology of Dive Foraging Seabirds written by Kenwin Liu and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modelling the Physiology Behaviour and Ecology of Dive Foraging Seabirds written by Kenwin Liu and published by . This book was released on 2002 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of tagging on behavior provisioning and reproduction in the common murre Uria aalge a diving seabird written by N.J. HAMEL and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of prey abundance on the foraging behaviour diving efficiency and time allocation of breeding guillemots Uria aalge written by P. Monaghan and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
