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Abstract Detail


Ecology / Ecologie (CBA/ABC)

Graves, Camille [1], Eppley, Sarah [2].

Local Adaptation and Sex Ratios in Ceratodon purpureus Growing at Extreme Temperatures in Geothermal Vents.

Either local adaptation or phenotypic plasticity, allow individuals of a species to exist across a wide environmental gradient. Many bryophytes have nearly cosmopolitan distributions, but little is known about what mechanisms allow such tolerance to wide environmental conditions to occur with one species. Using common garden and reciprocal transplant experiments, we will test for local adaptation in the cosmopolitan moss Ceratodon purpureus growing in temperatures from 15-65 °C. We will also use these populations to explore sex ratio variation and differential fitness between males and females to variation in temperatures. Unlike angiosperms, bryophytes have female-biased sex ratios in stressful environments. A new hypothesis states that this female bias is because the male pre-zygotic expenses are more costly than egg production for females. We will test this hypothesis with field surveys and manipulative experiments in the lab. These studies will provide empirical data to an unstudied system and provide information on preliminary data on bryophytes growing at extreme temperatures.


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1 - Portland State University, Biology, P.O. Box 751, Portland, OR, 97207-0751, United States
2 - Portland State University, Biology Department, Po Box 751, Portland, Oregon, 97207-0751, USA

Keywords:
local adaptation
phenotypic plasticity
sex ratios
Ceratodon purpureus.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM
Number: PEG002
Abstract ID:660


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