Agonistic behavior and feeding competition in the largest piranha species, Pygocentrus piraya, in a zooJournal of Ethology - Tập 41 - Trang 25-37 - 2022
Ronald G. Oldfield, Josie E. Thal, Praanjal Das, Nick J. Zarlinga, Kristen E. Lukas, Jason D. Wark
In the wild, piranhas are thought to feed in groups. Previous studies on piranhas in aquariums have variously observed either social attraction or aggressive dominance. The Rio São Francisco piranha (Pygocentrus piraya) is the largest species of piranha. It is rare in aquarium collections and its social and feeding behaviors have never been studied. To better understand behavior in this species, w...... hiện toàn bộ
Dynamic decision-making in uncertain environments I. The principle of dynamic utilityJournal of Ethology - Tập 31 - Trang 101-105 - 2013
Jin Yoshimura, Hiromu Ito, Donald G. Miller III, Kei-ichi Tainaka
Understanding the dynamics or sequences of animal behavior usually involves the application of either dynamic programming or stochastic control methodologies. A difficulty of dynamic programming lies in interpreting numerical output, whereas even relatively simple models of stochastic control are notoriously difficult to solve. Here we develop the theory of dynamic decision-making under probabilis...... hiện toàn bộ
Affiliation in the social interactions in captivity of the torch tail rat, Trinomys yonenagae (Rodentia: Echimyidae)Journal of Ethology - Tập 28 - Trang 105-112 - 2009
Jorge Nei Silva de Freitas, Luciano Augusto da Silva Carvalho, Charbel Niño El-Hani, Pedro Luís Bernardo da Rocha
In a previous paper, we measured the affiliation between male individuals of Trinomys yonenagae and concluded that the intensity of affiliation was high and did not differ between animals from the same social group and from different social groups. In this paper, we report the results obtained with the same experimental procedure with female individuals. We also discuss sexual differences in the s...... hiện toàn bộ
Sex recognition in zebrafish (Danio rerio)Journal of Ethology - Tập 29 - Trang 55-61 - 2010
Sophie Hutter, Sarah M. Zala, Dustin J. Penn
We investigated sex recognition in female zebrafish (Danio rerio) to better understand the underlying sensory mechanisms and identify male secondary sexual traits. Females were simultaneously presented with two fish, a male and a female, in a flow-chamber apparatus, and females’ relative attraction towards males was observed under different conditions. With domesticated fish, females were more att...... hiện toàn bộ
Distance-dependent switching of anti-predator behavior of frogs from immobility to fleeingJournal of Ethology - Tập 33 - Trang 117-124 - 2014
Nozomi Nishiumi, Akira Mori
To avoid predation, many animals are required to appropriately switch between immobility for crypsis and fleeing for escape. We conducted two staged-encounter experiments using a frog and a snake to examine factors that affect the occurrence of immobility and fleeing, and to evaluate the efficiency of them. The first experiment demonstrated that frogs initially exhibit immobility, when snakes are ...... hiện toàn bộ