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Frequency and success of ambush and chase predation in fish assemblages at seagrass and bare sediment in an Adriatic lagoon (CROSBI ID 151497)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Schultz, Stewart ; Kruschel, Claudia Frequency and success of ambush and chase predation in fish assemblages at seagrass and bare sediment in an Adriatic lagoon // Hydrobiologia, 649 (2010), 1; 25-37. doi: 10.1007/s10750-010-0256-1

Podaci o odgovornosti

Schultz, Stewart ; Kruschel, Claudia

engleski

Frequency and success of ambush and chase predation in fish assemblages at seagrass and bare sediment in an Adriatic lagoon

In the Novigrad Sea, Croatia, we tested the hypothesis that lower fish abundance in seagrass is associated with higher predation risk by assaying predator attack behavior with lure trolling over seagrass and neighboring bare substrate, by monitoring predator ingestion of prey in experimental tanks, and by analyzing gut contents of predators collected in nature. Lure trolling indicated that (1) total abundance of fish was higher at bare sediment where small fish ($< 5 \mbox{; ; ; ; ; ; cm}; ; ; ; ; ; $), including juveniles, predominated ; (2) abundance was lowest in seagrass where large fish ($> 15 \mbox{; ; ; ; ; ; cm}; ; ; ; ; ; $) predominated ; (3) large ambush predators, primarily the grass goby and European eel, were almost completely restricted to seagrass ; (4) the predation mode in seagrass was almost entirely ambushing or stalk-attacking, while the predation mode at bare sediment was almost entirely chase-attacking ; (5) ambush predation was far more successful than chase-attack predation ; and (6) overall predation risk was approximately $3 \times$ higher at seagrass. Tank experiments showed that predation success of the grass goby was higher than that of the most common chase-attacker, the black goby, and presence or absence of artificial seagrass, regardless of density, had no significant effect on predation success of either species. Guts of the grass goby contained food items of a wider size range that averaged twice the size of those of the black goby. Our results confirm our prediction that the risk of predation is higher in seagrass meadows than at adjacent bare substrate, and this risk differential is explainable by the presence of larger, more efficient ambush predators restricted to seagrass, and the scarcity of large chase-attack predators in the Novigrad Sea.

fish; seagrass; predator; prey; Adriatic 30

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Podaci o izdanju

649 (1)

2010.

25-37

objavljeno

0018-8158

10.1007/s10750-010-0256-1

Povezanost rada

Biologija

Poveznice
Indeksiranost