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Acclimation of Red Tide Dinoflagellate Karenia Brevis to Higher Temperatures Results in Abnormal Morphology and Changes in Growth Rates

Title: Acclimation of Red Tide Dinoflagellate Karenia Brevis to Higher Temperatures Results in Abnormal Morphology and Changes in Growth Rates.
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Name(s): Owen, Daniel P., author
Department of Biological Science
Type of Resource: text
Genre: text
Issuance: monographic
Date Issued: 2015
Physical Form: computer
Physical Form: online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: This paper addresses the effects of increased temperature on the Red Tide dinoflagellate, Karenia brevis. A clonal strain of Karenia brevis was acclimated to the currently estimated increase in Gulf temperatures over a period of time long enough to ensure proper acclimation of the experimental cultures. A long acclimation time was used to avoid temperature shock conditions for the culture and to more closely mimic natural temperature increases, such as those seen during seasonal transitions. Over the course of the experiment, K. brevis cultures were acclimated from 25° C to 31° C. An abnormal, rounded, cell morphology was produced in K. brevis cultures acclimated to 28° C and persisted in cultures acclimated through 28° C to 31° C. As well, specific growth rates of cultures growing at 25° C and acclimated to 30° C differed depending on whether the average growth rates were derived from culture cell density or RFU measurements. K. brevis cultures grown in GP/2 media had significantly higher average growth rates based on RFU measurements than cultures growing in L1-Si media. Cultures growing at 25° C and 30° C did not have significantly different chlorophyll a content per cell. In conjunction with the rounded cell morphology, the reported higher maximum temperature range, and future physiological observations, the result of this experiment aim to help researchers understand what may be happening to populations of K. brevis throughout seasonal temperature variations.
Identifier: FSU_migr_uhm-0515-P (IID)
Keywords: Red Tide, Karenia brevis, dinoflagellate, Harmful Algal Bloom, growth rates, acclimation
Submitted Note: A Thesis submitted to the Department of Biological Sciences in partial fulfillment of the requirements for graduation with Honors in the Major for Marine Biology.
Degree Awarded: Spring Semester, 2015.
Date of Defense: April 20, 2015.
Subject(s): Marine biology
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_migr_uhm-0515-P
Owner Institution: FSU
Is Part of Series: Honors Theses.