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The Effects of Nutrient Status and T...

Brennan, Melanie Agnes.

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The Effects of Nutrient Status and Thermal Stress in the Symbiotic Sea Anemone Exaiptasia pallida.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The Effects of Nutrient Status and Thermal Stress in the Symbiotic Sea Anemone Exaiptasia pallida./
Author:	Brennan, Melanie Agnes.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	88 p.
Notes:	Source: Masters Abstracts International, Volume: 81-04.
Contained By:	Masters Abstracts International81-04.
Subject:	Biology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=22583646
ISBN:	9781687973887

The Effects of Nutrient Status and Thermal Stress in the Symbiotic Sea Anemone Exaiptasia pallida.
Brennan, Melanie Agnes.

The Effects of Nutrient Status and Thermal Stress in the Symbiotic Sea Anemone Exaiptasia pallida. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 88 p.

Source: Masters Abstracts International, Volume: 81-04.

Thesis (M.S.)--University of Delaware, 2019.

This item must not be sold to any third party vendors.

Corals reefs are rapidly disappearing under the damage of exposure to high temperature caused by climate change, which results in bleaching (a loss of algal symbionts). Corals that feed heterotrophically on zooplankton display less stress under increased temperature and recover faster from bleaching events; however it is not understood how coral preacclimation to available nutrient levels (and in turn nutrient availability to symbionts) impacts thermal tolerance. The symbiotic sea anemone Exaiptasia pallida was exposed to two different feeding regimes: fed Artemia salina nauplii once weekly, or starved (unfed) for 31 days. In addition, another set of animals were withheld food, but were treated with low-levels of nitrate and phosphate (5 µM and 0.5 µM respectively). Anemones were subsequently heated to 32 °C for an additional 10-14 days and continued nutrient treatment. During nutrient exposure, fed anemones maintained maximum quantum yield of photosystem II (Fv/Fm) and wet weight, while both unfed groups lost wet weight. Furthermore, starved anemones consumed more Artemia after 31 days of nutrient treatment. High temperature led to signs of bleaching stress, observed as a decline in symbiont density and a drop in Fv/Fm; however the percentage of carbon translocated to the host increased in starved anemones. Together, these results indicate that heterotrophic feeding gives symbiotic anemones a potential advantage in combating bleaching stress. However, the documented advantage of heterotrophic feeding to corals was increased symbiont density and photosynthetic efficiency of photosystem II, but in this study the observed advantage to sea anemones was maintenance of animal size and respiration rate. Understanding the ecological implications of how sessile marine invertebrates respond to bleaching will be key in understanding the ecological impacts of global warming on coral reefs.

ISBN: 9781687973887Subjects--Topical Terms:

522710
Biology.
Subjects--Index Terms:

Breviolum minutum

The Effects of Nutrient Status and Thermal Stress in the Symbiotic Sea Anemone Exaiptasia pallida.
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245 1 4 $a The Effects of Nutrient Status and Thermal Stress in the Symbiotic Sea Anemone Exaiptasia pallida.
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300 $a 88 p.
500 $a Source: Masters Abstracts International, Volume: 81-04.
500 $a Advisor: Warner, Mark E.
502 $a Thesis (M.S.)--University of Delaware, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a Corals reefs are rapidly disappearing under the damage of exposure to high temperature caused by climate change, which results in bleaching (a loss of algal symbionts). Corals that feed heterotrophically on zooplankton display less stress under increased temperature and recover faster from bleaching events; however it is not understood how coral preacclimation to available nutrient levels (and in turn nutrient availability to symbionts) impacts thermal tolerance. The symbiotic sea anemone Exaiptasia pallida was exposed to two different feeding regimes: fed Artemia salina nauplii once weekly, or starved (unfed) for 31 days. In addition, another set of animals were withheld food, but were treated with low-levels of nitrate and phosphate (5 µM and 0.5 µM respectively). Anemones were subsequently heated to 32 °C for an additional 10-14 days and continued nutrient treatment. During nutrient exposure, fed anemones maintained maximum quantum yield of photosystem II (Fv/Fm) and wet weight, while both unfed groups lost wet weight. Furthermore, starved anemones consumed more Artemia after 31 days of nutrient treatment. High temperature led to signs of bleaching stress, observed as a decline in symbiont density and a drop in Fv/Fm; however the percentage of carbon translocated to the host increased in starved anemones. Together, these results indicate that heterotrophic feeding gives symbiotic anemones a potential advantage in combating bleaching stress. However, the documented advantage of heterotrophic feeding to corals was increased symbiont density and photosynthetic efficiency of photosystem II, but in this study the observed advantage to sea anemones was maintenance of animal size and respiration rate. Understanding the ecological implications of how sessile marine invertebrates respond to bleaching will be key in understanding the ecological impacts of global warming on coral reefs.
590 $a School code: 0060.
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653 $a Nutrients
653 $a Symbiosis
653 $a Thermal tolerance
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690 $a 0416
710 2 $a University of Delaware. $b Marine Studies. $3 1270038
773 0 $t Masters Abstracts International $g 81-04.
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791 $a M.S.
792 $a 2019
793 $a English
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