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- Title
Functional responses of juvenile herring and sprat in relation to different prey types.
- Authors
Brachvogel, R.; Meskendahl, L.; Herrmann, J.-P.; Temming, A.
- Abstract
The relationship between particulate-feeding rates and prey concentrations (functional response) of juvenile herring and sprat (5-9 cm total length) was investigated in controlled feeding experiments monitored by an underwater camera system. A special tank system was developed allowing the regulation and quantification of low prey concentrations (1-160 L). Non-evasive Artemia nauplii was used as prey to estimate the maximum biting rate of both predators. In contrast, Acartia tonsa with a high escape ability was used as a realistic prey type. Herring and sprat showed a type II functional response for both prey types. Nonlinear mixed effects model revealed no significant difference between the functional responses of both predators, except that herring showed significantly higher biting rates than sprat at A. tonsa concentrations below ~40 L. For both predators feeding rates were significantly higher with Artemia nauplii than with A. tonsa. Video analysis indicated that sprat, unlike herring, is an obligate particulate-feeder.
- Subjects
FISH food; FISH research; SPRAT; UNDERWATER cameras; PREDATORY animals
- Publication
Marine Biology, 2013, Vol 160, Issue 2, p465
- ISSN
0025-3162
- Publication type
Article
- DOI
10.1007/s00227-012-2104-5