IMIS | Flanders Marine Institute
 

Flanders Marine Institute

Platform for marine research

IMIS

Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ]basket (0): add | show Print this page

Causes and consequences of foraging specialisation in a central place forager
van den Bosch, M. (2018). Causes and consequences of foraging specialisation in a central place forager. MSc Thesis. Universiteit Gent: Gent. 27 pp.

Thesis info:

Available in  Author 
Document type: Dissertation

Keyword
    Marine

Author  Top 
  • van den Bosch, M.

Abstract
    Animal populations often host individuals that differ in terms of foraging behaviour. It is still largely unknown what causes and maintains these differences, and whether they have fitness implications. In this research project, the causes and consequences of foraging generalism versus foraging specialisation were studied in GPS-equipped Herring Gulls (Larus Argentatus) breeding along the Belgian coast. Foraging specialisation was quantified both in terms of resource specialisation and spatial specialisation, during three distinguished periods of the breeding season. Morphological traits or sex could not be assigned as predictors of foraging differences. While drivers of foraging specialisation thus remain unknown, it is suggested that levels of specialisation may rather be due to behavioural differences. Contrary to expectations, energy expenditure of spatial specialists was higher than that of spatial generalists during the chick rearing period. Spatial specialists traversed longer distances during the other two periods of the breeding season. Furthermore, no effects of foraging specialisation on the reproductive success of individuals were found. In the absence of such fitness implications, the co-existence of multiple foraging strategies may result in populations that are more resistant to environmental stochasticity.

All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Author