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• W2000404773 abstract "(Top) Killifish (f) Rivulus hartii prey on guppies. (Bottom) Guppies (m and f) Poecilia reticulata prey on hatchling killifish. Photo: Pierson Hill. Mountain streams in Trinidad host a number of species, with the most common being the familiar guppy Poecilia reticulata and a killifish Rivulus hartii. While killifish and guppies often coexist in downstream reaches, headwater reaches typically host killifish alone, as waterfalls restrict the upstream movement of guppies. Under these conditions the densities of killifish average two to three times greater than when guppies are also present. Given that previous work has mostly depicted killifish as predators of guppies, the negative effect of guppies on killifish densities required additional explanation. Laboratory trials showed that the predatory relationship reverses when size is considered; adult guppies can consume hatchling killifish. To test the potential impact of guppy predation in more natural conditions, we conducted field introductions and mesocosm studies to identify the relative contributions of predation and competition to the interaction. Results from both studies were inconsistent with competition being the sole interaction, and supported predation by guppies as a key contributor to the reduction in killifish density when guppies are present. We suggest that this study demonstrates how an invader's ability to consume its predator can facilitate the initial stages of its invasion into potentially hostile habitat. Fourth-order Guanapo River, Trinidad. Guppies were introduced into four tributaries upstream of this location. Photo: Doug Fraser. (Top) marking and weighing Rivulus, (bottom) processed Rivulus waiting to be returned to their point of capture. Photo: Doug Fraser. Releasing marked Rivulus in an introduction site. A meter tape runs the length of the study area. Photo: Brad Lamphere. Flow-through bins used in competition experiment in Ramdeen Stream. Inset shows the screened bottom window. Note blocking for position effect. Photo: Doug Fraser. Night sampling Rivulus at an introduction site. Extended exposure. Photo: Pierson Hill. These photographs illustrate the article “Experimental evaluation of predation as a facilitator of invasion success in a stream fish” by Douglas F. Fraser and Bradley A. Lamphere, published in Ecology 94(3), March 2013. doi: http://dx.doi.org/10.1890/12-0803.1" @default.
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• W2000404773 date "2013-07-01" @default.
• W2000404773 modified "2023-10-14" @default.
• W2000404773 title "PREDATION AS A FACILITATOR OF INVASION SUCCESS IN A STREAM FISH" @default.
• W2000404773 doi "https://doi.org/10.1890/0012-9623-94.3.260" @default.
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