Seagrass habitat complexity does not always decrease foraging efficiencies of piscivorous fishes

Horinouchi, Masahiro; Mizuno, Naoki; Jo, Yuka; Fujita, Masashi; Sano, Mitsuhiko; Suzuki, Yuzuru

doi:10.3354/meps07869

Cited by 64 publications

(49 citation statements)

References 26 publications

(15 reference statements)

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“…In fact, we frequently encountered roach in open habitats adjacent to structured habitats while capturing organisms for our trials. The emergent theme of our results is that structured habitat serves as optimal refuge habitat only if roach are able to detect the speciWc location (direction) from which a predation threat will come from (Horinouchi et al 2009;Schultz et al 2009). …”

Section: Discussionmentioning

confidence: 95%

“…Notably, these studies and our own experiment all suggest that if structure increases uncertainty for prey in locating predation threats, prey species do not necessarily associate complex habitats with suitable refuge. Studies on gobies under pressure from cryptic ambush predators (sculpin) have shown that prey can experience elevated mortality while occupying dense seagrass patches (Horinouchi et al 2009). Similarly, James and Heck (1994) showed that increasing density of artiWcial vegetation had no impact on the foraging eYciency of another well-camouXaged ambush predator, the seahorse.…”

Section: Discussionmentioning

confidence: 99%

“…We hypothesize that roach may escape structured habitat when a pike is detected through only olfactory cues, because, although roach are aware of threat, they may not be able to determine the direction from which a camouXaged, stationary pike will attack. As a result, they seek open habitat to increase their opportunity to locate pike visually (sensu Horinouchi et al 2009;Schultz et al 2009). Conversely, once a stationary pike is located visually (alone or in combination with olfaction), roach can use structured habitat for the mechanical defense it provides against directed pike attacks (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Differential habitat use and antipredator response of juvenile roach (Rutilus rutilus) to olfactory and visual cues from multiple predators

et al. 2010

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The indirect, behavioral effects of predation and predator-predator interactions can significantly alter the trophic ecology of many communities. In numerous instances, the strength of these effects may be determined by the ability of prey to identify predation risk through predator-specific cues and respond accordingly to avoid capture. We exposed juvenile roach (Rutilus rutilus), a common forage fish in many brackish and freshwater environments, to vision and/or olfactory cues from two predators with different hunting methods: northern pike (Esox lucius, an ambush predator) and European perch (Perca fluviatilis, a roving predator). Our results demonstrated that responses of roach to perceived risk (as evidenced by their selection of structured or open-water habitats) were highly dependent on cue type and predator identity. For instance, roach responded to olfactory cues of pike by entering open-water habitat, but entered structured habitat when presented with a vision cue of this predator. Opposite responses were elicited from roach for both olfactory and visual cues of perch. Interestingly, roach defaulted to selection of structured habitat when presented with vision + olfaction cues of either predator. Moreover, when presented individual cues of both predators together, roach responded by choosing open-water habitat. Upon being presented with vision + olfaction cues of both predators, however, roach strongly favored structured habitat. Differences in habitat selection of roach were likely in response to the alternative foraging strategies of the two predators, and suggest that prey species may not always use structured habitats as protection. This appears particularly true when a threat is perceived, but cannot immediately be located. These results provide insight to the complex and variable nature by which prey respond to various cues and predators, and offer a mechanistic guide for how behaviorally mediated and predator-predator interactions act as structuring processes in aquatic systems.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Differential habitat use and antipredator response of juvenile roach (Rutilus rutilus) to olfactory and visual cues from multiple predators

et al. 2010

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“…Such structural complexity gives excellent shelter from predators, but recent studies demonstrate that its effects on predation are species specific (Horinouchi, 2007;Horinouchi et al, 2009;Kon et al, 2009). For example, dense seagrass structure improves foraging efficiency of predators employing ambush and stalk-and-attack tactics, even though the swards reduce the effectiveness of chase-and-attack predators (Horinouchi et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

Influence of a microhabitat on the structuring of the benthic macrofaunal community in a mangrove forest

2011

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Habitat heterogeneity contributes to the maintenance of species diversity; however, little is known about the influence of microhabitat heterogeneity on the diversity of mangrove invertebrates. We tested the hypothesis that the structures of benthic faunal communities differ among microhabitats because each microhabitat function differs widely according to their physical properties. The descriptors of invertebrate assemblages were determined every March (dry season) and August (wet season) of 2005, 2006, and 2007 in three different mangrove microhabitats-tidal creek, deep forest, and canopy gapof an intertidal mangrove forest around the Sikao Creek in the Trang Province of southern Thailand. The physical properties of the selected microhabitats were studied in 2005. The properties of each microhabitat varied, especially with respect to the light intensity and sediment moisture content: the tidal creeks were wet and well-exposed to sunlight, forest interiors were moist and dark, and the canopy gaps were dry and well-exposed to sunlight. Seasonal differences in the microhabitats were also noted. The numerical abundance and biomass of benthic macrofauna differed among the microhabitats; both values were the highest in canopy gaps, and these values increased in the wet season. Despite seasonal differences, species composition differed in the three microhabitats; the majority of animals were members of the epifauna; these were surface deposit feeders. Each microhabitat functioned differently because their physical properties were disparate. A diverse benthic faunal community is formed by a combination of different functional microhabitats in mangrove ecosystems, thereby indicating that microhabitat heterogeneity should be considered as an important factor influencing the structuring of a benthic community.Electronic supplementary material The online version of this article (

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“…seagrass and salt marsh) habitat to mud and sand areas, the vegetated habitats often enhance survival of juvenile fish and invertebrates (Heck et al 2001, Minello et al 2003, but see Horinouchi et al 2009). Vegetation also enhanced survival of settlers in this study.…”

Section: Survivalmentioning

confidence: 99%

Mangrove expansion into temperate marshes alters habitat quality for recruiting Callinectes spp.

Johnston¹,

Caretti²

2017

Mar. Ecol. Prog. Ser.

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Seagrass habitat complexity does not always decrease foraging efficiencies of piscivorous fishes

Cited by 64 publications

References 26 publications

Differential habitat use and antipredator response of juvenile roach (Rutilus rutilus) to olfactory and visual cues from multiple predators

Differential habitat use and antipredator response of juvenile roach (Rutilus rutilus) to olfactory and visual cues from multiple predators

Influence of a microhabitat on the structuring of the benthic macrofaunal community in a mangrove forest

Mangrove expansion into temperate marshes alters habitat quality for recruiting Callinectes spp.

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