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- W2043117955 abstract "We compare the demography of natural populations of guppies (Poecilia reticulata) coexisting with two different communities of predators. In some populations, guppies co-occur with Rivulus hartii, a small, gape-limited predator; in others, guppies co-occur with larger species of fish that also prey on guppies. We found an association between the demography of the resident guppy population and the species of predator(s) present at a site. Populations of guppies that co-occurred with Rivulus had fewer small, immature guppies and more mid- and large-sized, mature guppies than populations of guppies that lived in the community of larger predators. The sex ratio of adult guppies did not differ between predator localities but it was significantly more variable among sites with the small predator. Ninety percent of all samples had a female-biased sex ratio. Season (wet vs. dry season) did not have a statistically significant influence on sex ratio or on stage or size distributions. The observed variation in guppy demography could be simply a result of differences in the prey size preferences of the predators. However, guppies from the two types of localities show considerable differences in life history traits, including age at maturity and fecundity. This variation in traits could be contributing to the differences in demography. Indeed, results from an individual-based computer model suggest that fecundity, offspring size, and individual growth rates were most influential in producing interlocality differences in size distributions and the proportions of the populations that were immature. Mortality rates and individual growth rates seem to make the greatest contribution to variation in adult sex ratio. Therefore, the observed patterns in the demography of these populations appear to result from complex interactions between the mortality schedules and life history traits of their constituents." @default.
- W2043117955 created "2016-06-24" @default.
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- W2043117955 date "1997-03-01" @default.
- W2043117955 modified "2023-10-15" @default.
- W2043117955 title "VARIATION IN THE DEMOGRAPHY OF GUPPY POPULATIONS:THE IMPORTANCE OF PREDATION AND LIFE HISTORIES" @default.
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- W2043117955 doi "https://doi.org/10.1890/0012-9658(1997)078[0405:vitdog]2.0.co;2" @default.
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