caa a22 4500 465782299 CHVBK 20180323111958.0 cr unu---uuuuu 170327e19900501xx s 000 0 eng 10.1007/BF00171098 doi (NATIONALLICENCE)springer-10.1007/BF00171098 Magnhagen Carin Department of Zoology, Uppsala University, Box 561, S-751 22, Uppsala, Sweden aut Reproduction under predation risk in the sand goby, Pomatoschistus minutes , and the black goby, Gobius niger [Elektronische Daten] the effect of age and longevity [Carin Magnhagen] Summary: In aquarium experiments, the two marine gobiid fish species Pomatoschistus minutus and Gobius niger were allowed to build nests and to spawn in the presence and absence of a predator (cod, Gadus morhua); behind a glass wall the predator was kept where it could be clearly seen by the gobies and vice versa. P. minutus showed no difference in number of nests or number of spawnings in the different treatments; approximately half of the males built nests, and the females spawned in half of those nests. G. niger, on the other hand, responded differently to the simulated predation risk. No nests were built in sight of the predator, whereas in the absence of predators, half of the males built nests and received eggs. The G. niger individuals in this experiment were 2-3 years old. However, when comparing the reproduction of G. niger of different age in the presence of a predator, older individuals (4-5 years) spawned, whereas younger (2-3 years) did not. No difference in vulnerability towards predators was found between equal-sized P. minutus and G. niger. The optimal behavior during the breeding season must depend on prospects of survival, based both on maximal lifespan and vulnerability to predation. Springer-Verlag, 1990 Behavioral Ecology and Sociobiology Springer-Verlag 26/5(1990-05-01), 331-335 0340-5443 26:5<331 1990 26 265 https://doi.org/10.1007/BF00171098 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00171098 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Magnhagen Carin Department of Zoology, Uppsala University, Box 561, S-751 22, Uppsala, Sweden aut NATIONALLICENCE 773 0- Behavioral Ecology and Sociobiology Springer-Verlag 26/5(1990-05-01), 331-335 0340-5443 26:5<331 1990 26 265 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer