Published online by Cambridge University Press: 31 July 2009
The foraging behaviour and ecology of top predators are expressions of trophic and ecosystem dynamics. Oceanographic fluctuations as well as biological interactions affect exothermic species and, through them, influence their endothermic predators. Planktivorous and piscivorous, surface-feeding and diving seabirds exhibit varying constraint, flexibility, specialization and opportunism in their responses to prey and environmental conditions. Responses can be direct in terms of foraging behaviour, prey capture and diet; or indirect in terms of egg and chick production, growth, breeding success, recruitment and population change. Protracted indirect effects lag behind and buffer environmental change with behaviour and life-history attributes. Focal forage species that fuel large vertebrate food webs exhibit extreme fluctuations in abundance, being highly sensitive to biophysical perturbations, including fishing. Changes in their biology often shift ecosystems to alternative states, yet forage species are understudied. Indications about forage species derived from seabirds can be broadly informative. Synoptic meso-scale studies that link colony measurements to vessel surveys of prey and predators within avian foraging ranges provide an approach for assessing predator responses to variation in prey fields and oceanography. Tracking free-ranging foragers with animal-borne data loggers (which record temperature, pressure, activity and position) details behavioural solutions to current conditions. These foraging tactics of individual predators are mechanisms of the social and population responses that we measure, estimate and model. Physical data from loggers, vessels and satellites can be combined to define thermal habitats and ‘hotspots’ used by predators and prey.
To save this book to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.