Analysis of foraging movements of Atlantic bluefin tuna ( Thunnus thynnus ): individuals switch between two modes of search behaviour

Autor:	Nathaniel K. Newlands, Molly Lutcavage, Tony J. Pitcher
Rok vydání:	2004
Předmět:	0106 biological sciences biology 010604 marine biology & hydrobiology Foraging Taxis Orthokinesis Klinokinesis biology.organism_classification 010603 evolutionary biology 01 natural sciences Fishery Spectral analysis 14. Life underwater Tuna Ecology Evolution Behavior and Systematics Thunnus
Zdroj:	Population Ecology. 46:39-53
ISSN:	1438-390X 1438-3896
DOI:	10.1007/s10144-004-0169-9
Popis:	We investigate the application of quantitative techniques for distinguishing adaptive search behaviour in Atlantic bluefin tuna (Thunnus thynnus). The analysis demonstrates the application of a novel spectral analysis technique for resolving and measuring periodicity in animal behaviour patterns. Two different search strategies are identified that include regulation of turning (klinokinesis) and speed (orthokinesis). Our results provide evidence that bluefin tuna attempt to optimize their searching efficiency through adjustments in the duration and timing of switching between these two searching strategies. Repetitive, diurnal deep dives were also found to coincide with switching of search behaviour. Additional tracking experiments with larger sample sizes are needed to better identify how individuals switch between the two search strategies and how such decisions may collectively improve the searching and foraging efficiency of their schools (synchrokinesis, social taxis) in response to changes in the size or composition of prey aggregations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1adc1e23b8fdaa79a20514150e4785b0 https://doi.org/10.1007/s10144-004-0169-9 Zobrazit plný text záznamu Full text from SpringerLink Plný text