Biotic structure indirectly affects associated prey in a predator-specific manner via changes in the sensory environment.
Oecologia
; 171(2): 427-38, 2013 Feb.
Article
en En
| MEDLINE
| ID: mdl-22821422
Indirect effects, which can be either positive or negative, may be important in areas containing biotic structure, because such structure can provide refuge and habitat, produce additional sensory cues that may attract predators, and modify the sensory landscape in which predator-prey interactions occur. To determine the indirect effects of biotic structure on prey populations, we assessed predation on patches of hard clams (Mercenaria mercenaria) by large odor-mediated blue crab (Callinectes sapidus) and knobbed whelk (Busycon carica) predators at 0, 5, and 10 m from oyster reefs in intertidal salt marshes. Oyster reefs had an overall indirect negative effect on hard clams, with higher predation rates closer to the reef than farther away. Predator-specific patterns of predation showed that blue crabs consumed more clams very close to the reef, whereas whelks consumed more clams at intermediate distances. Laboratory flume experiments suggest that the oyster reef structure creates turbulence that diminishes predator foraging efficiency, particularly in rapidly mobile predators such as blue crabs, but that oyster reef chemicals ameliorate the negative impact of turbulence on foraging success for both predators. Changes in the sensory landscape, in combination with predator perceptual ability, will determine the positive and/or negative impacts of biotic structure on associated prey. Gaining an understanding of the context specificity of positive and negative sensory effects of biotic structure provides insights that are important for developing a predictive framework to assess the magnitude and distribution of indirect interactions in natural communities.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Olfato
/
Bivalvos
/
Cadena Alimentaria
/
Braquiuros
Tipo de estudio:
Prognostic_studies
/
Risk_factors_studies
Límite:
Animals
Idioma:
En
Revista:
Oecologia
Año:
2013
Tipo del documento:
Article
País de afiliación:
Estados Unidos
Pais de publicación:
Alemania