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Maternal Effects on Reproduction and Fitness in the Least Killifish, Heterandria formosa

Title: Maternal Effects on Reproduction and Fitness in the Least Killifish, Heterandria formosa.

Inaccessible until Apr 22, 2020 due to copyright restrictions.

Name(s): Levell, Samantha, author
Travis, Joseph, author
Type of Resource: text
Genre: Text
Date Issued: 2016-04-22
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: Maternal effects are traits exhibited in offspring that are determined by the genotype and environment of their mother. Maternal effects can be adaptive or maladaptive given the environment, but it is unclear how long they last in subsequent generations. The least killifish, Heterandria formosa, is an interesting study subject for this question because it is a live-bearing Poeciliid fish that has extreme matrotrophy. In this experiment we address how conspecific density influences reproduction and fitness and how these influences extend across generations. Using variation in crowding as an environmental gradient, low and high density environments were created based on natural population densities for two populations of H. formosa. One of these populations naturally experiences high densities (Wacissa River, WR) and the other normally low densities (Trout Pond, TP) compared to other H. formosa populations. We measured several life history variables: survival, reproductive rate, and offspring size at birth (maternal investment). We found distinctive maternal effects on offspring size in Wacissa River, and on reproductive rate in Trout Pond. Females from WR whose mothers experienced high densities produced offspring that were larger than those whose mothers experienced low densities. Females from TP whose mothers experienced low densities produced more offspring than TP females whose mothers experienced high densities. However, these effects diminished over reproductive time, as fish began adapting to their current environment in terms of reproductive output. After several weeks, females were giving birth to offspring no longer gestated in a common garden environment, so females responded to their current density rather than their mother’s density. Females at high densities began to produce fewer, larger offspring and many, smaller offspring at lower densities.
Identifier: FSU_libsubv1_scholarship_submission_1461352346 (IID)
Keywords: maternal effects, Heterandria formosa, placental, crowding, transgenerational, fish
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Owner Institution: FSU

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Levell, S., & Travis, J. (2016). Maternal Effects on Reproduction and Fitness in the Least Killifish, Heterandria formosa. Retrieved from