caa a22 4500 477115934 CHVBK 20180405111622.0 cr unu---uuuuu 170330e19960101xx s 000 0 eng 10.1007/BF00000629 doi (NATIONALLICENCE)springer-10.1007/BF00000629 Social behavior of juvenile chum salmon, Oncorhynchus keta , under risk of predation: the influence of food distribution [Elektronische Daten] [Clifford Ryer, Bori Olla] Synopsis: Social interactions can influence both foraging reward and vulnerability to predators. We examined social interactions in groups of juvenile chum salmon, Oncorhynchus keta, receiving food that was either spatially dispersed, with many food items appearing synchronously, or spatially clumped, with individual food items appearing asynchronously. These experiments were conducted both in the presence and absence of predators. when food was dispersed and predators were absent, juvenile chum formed schools and all individuals had access to food, despite frequent agonistic interactions. When predators were present, schooling and feeding continued, but agonistic interactions ceased. In contrast, when food was clumped, dominant fish utilized aggression to monopolize food regardless of whether predators were present or absent, resulting in decreased group cohesion. These results illustrate that food distribution and social interaction may play a role in determining how fish balance predation risk against foraging reward. Kluwer Academic Publishers, 1996 Risk balancing nationallicence Trade-off nationallicence Aggression nationallicence Schooling nationallicence Food monopolization nationallicence Fish nationallicence Ryer Clifford Alaska Fisheries Center, National Marine Fisheries Service, Hatfield Marine Science Center, 97365, Newport, OR, U.S.A. aut Olla Bori Alaska Fisheries Center, National Marine Fisheries Service, Hatfield Marine Science Center, 97365, Newport, OR, U.S.A. aut Environmental Biology of Fishes Kluwer Academic Publishers 45/1(1996-01-01), 75-83 0378-1909 45:1<75 1996 45 10641 https://doi.org/10.1007/BF00000629 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00000629 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ryer Clifford Alaska Fisheries Center, National Marine Fisheries Service, Hatfield Marine Science Center, 97365, Newport, OR, U.S.A aut NATIONALLICENCE 700 1- Olla Bori Alaska Fisheries Center, National Marine Fisheries Service, Hatfield Marine Science Center, 97365, Newport, OR, U.S.A aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Kluwer Academic Publishers 45/1(1996-01-01), 75-83 0378-1909 45:1<75 1996 45 10641 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer