Michael Breuker's research while affiliated with Fachhochschule der Wirtschaft and other places

Publications (6)

Preprint
Resource availability and sociality are tightly coupled. Sociality facilitates resource access in a wide range of animal species. Simultaneously, resource availability may change sociality. However, experimental evidence for resource-driven social changes in the wild, beyond local aggregations at the resource, remains scarce. Moreover, it is largel...
Article
Recent comparative studies of billfishes (Istiophoridae and Xiphiidae) have provided evidence of differences in the form and function of the rostra (bill) among species. Here, we report the discovery of a new structure, lacuna rostralis, on the rostra of sailfish Istiophorus platypterus, which is absent on the rostra of swordfish Xiphias gladius, s...
Article
Full-text available
Sociality is a fundamental organizing principle across taxa, thought to come with a suite of adaptive benefits. However, making causal inferences about these adaptive benefits requires experimental manipulation of the social environment, which is rarely feasible in the field. Here we manipulated the number of conspecifics in Trinidadian guppies (Po...
Preprint
Full-text available
Sociality is a fundamental organizing principle across taxa, thought to come with a suite of adaptive benefits. However, making causal inferences about these adaptive benefits requires experimental manipulation of the social environment, which is rarely feasible in the field. Here we manipulated the number of conspecifics in Trinidadian guppies (Po...
Article
Full-text available
Linking morphological differences in foraging adaptations to prey choice and feeding strategies has provided major evolutionary insights across taxa. Here, we combine behavioural and morphological approaches to explore and compare the role of the rostrum (bill) and micro-teeth in the feeding behaviour of sailfish (Istiophorus platypterus) and strip...

Citations

... Sociality facilitates foraging success in a wide range of animals, both in captivity (Grand & Dill, 1999;Harpaz & Schneidman, 2020;Krebs et al., 1972;Pitcher et al., 1982), and in the wild (Morand-Ferron & Quinn, 2011;Snijders et al., 2021). On an individual level, more social guppies (Poecilia reticulata) and great tits (Parus major) with more central network positions visited more novel food patches (Aplin et al., 2012;Snijders et al., 2018Snijders et al., , 2019, while more social three-spined sticklebacks (Gasterosteus aculeatus) experienced less food intake variance (Jolles et al., 2017). ...
... Moreover, that striped marlin regularly shifted depth patterns across time and location demonstrated adaptive use of the water column, likely in response to local foraging opportunities. Considering that striped marlin are known to rush at a sardine school near the sea surface (Hansen et al., 2020), they might use the same hunting strategy at boundary conditions, namely at the top of and in the thermocline and oxycline (Lam et al., 2015) to exploit a diverse selection of prey (Abitia-Caŕdenas et al., 1997;Shimose et al., 2010;Ortega Garcia et al., 2017). This would reduce competition with other top predators through trophic niche separation (Acosta-Pachoń and Ortega-Garcıá, 2019;Rosas-Luis et al., 2021). ...