Dissertation/Thesis Abstract

Recent Thermal History Controls Microalgal Photosynthetic Response to Subsequent High Temperature Exposure
by Hunt, Elizabeth M., M.S., California State University, Long Beach, 2017, 60; 10638608
Abstract (Summary)

In addition to higher average temperatures, many regions of Earth are also experiencing higher variability. I investigated how prior thermal history and intensity of an acute high temperature challenge affected post-exposure photosynthetic performance of microalgae on rocky shores. I measured community-level net photosynthetic rate (NPR) on experimental plates left in the field for one or seven months before and after exposure to a simulated low tide. After one month, microalgal NPR decreased more after exposure to higher peak temperatures, although the effect was mitigated somewhat by prior exposure to thermal variability. In contrast, after seven months there was no effect of temperature on NPR. There were, however, differences due to shore height and experiment duration, with respect to overall biomass and pre-exposure NPR. Scanning electron microscopy (SEM) suggested that changes in the identity and relative abundances of microalgal taxa associated with increasing aerial exposure during low tides might be responsible.

Indexing (document details)
Advisor: Allen, Bengt J.
Commitee: Funk, Jennifer L., Whitcraft, Christine R.
School: California State University, Long Beach
Department: Biological Sciences
School Location: United States -- California
Source: MAI 57/02M(E), Masters Abstracts International
Subjects: Biology, Ecology
Keywords: Community structure, Heat stress, Intertidal zone, Microphytobenthos, Primary productivity, Shore height
Publication Number: 10638608
ISBN: 978-0-355-57546-0
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