Ultrastructural Responses in Field-Bleached and Experimentally Stressed emAmphistegina gibbosa/em (Class Foraminifera)

Helen K. Talge; Pamela Hallock; Pamela Hallock Muller

doi:10.1111/j.1550-7408.2003.tb00143.x

Ultrastructural Responses in Field-Bleached and Experimentally Stressed emAmphistegina gibbosa/em (Class Foraminifera)

Helen K. Talge, Pamela Hallock, Pamela Hallock Muller

Research output: Contribution to journal › Article › peer-review

Abstract

Amphistegina are the most common foraminifers with algal endosymbionts found on reefs and carbonate shelves worldwide. Like zooxanthellate corals and other reef organisms with algal symbionts, Amphistegina respond to photoxidative stress by bleaching. This paper documents Ultrastructural changes that occur during bleaching under field and laboratory conditions. Nine chambers from the outer whorl of each of 22 normal&hyphen;appearing and 11 partly bleached specimens of Amphistegina gibbosa , which were collected from Conch Reef, Florida, USA, were examined using transmission electron microscopy. The condition and numbers of algal symbionts, as well as the cell area occupied by 10 other intracellular structures of the host, were quantified. Normal&hyphen;appearing specimens averaged three times more viable symbionts and less than a fourth as many deteriorating symbionts as partly bleached specimens. Foraminifers experimentally exposed to visible light intensities a 13 μmole photon m −2 s −1 for 35 d were statistically similar to partly bleached field specimens in the number and condition of symbionts, and in chamber area occupied by the evaluated host structures. Exposure to 32 °C water temperature at 6–8 μmole photon m −2 s −1 for 28 d induced symbiont loss but did not degrade host endoplasm.

Original language	American English
Journal	Journal of Eukaryotic Microbiology
Volume	50
DOIs	https://doi.org/10.1111/j.1550-7408.2003.tb00143.x
State	Published - Jan 1 2003

Keywords

algal symbiosis
conch reef
coral reefs
cytology
electron microscopy
florida keys
photic stress
thermal stress
ultraviolet radiation
zooxanthellae

Disciplines

Life Sciences

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10.1111/j.1550-7408.2003.tb00143.xLicense: CC BY

https://doi.org/10.1111/j.1550-7408.2003.tb00143.x

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title = "Ultrastructural Responses in Field-Bleached and Experimentally Stressed emAmphistegina gibbosa/em (Class Foraminifera)",

abstract = " Amphistegina are the most common foraminifers with algal endosymbionts found on reefs and carbonate shelves worldwide. Like zooxanthellate corals and other reef organisms with algal symbionts, Amphistegina respond to photoxidative stress by bleaching. This paper documents Ultrastructural changes that occur during bleaching under field and laboratory conditions. Nine chambers from the outer whorl of each of 22 normal&hyphen;appearing and 11 partly bleached specimens of Amphistegina gibbosa , which were collected from Conch Reef, Florida, USA, were examined using transmission electron microscopy. The condition and numbers of algal symbionts, as well as the cell area occupied by 10 other intracellular structures of the host, were quantified. Normal&hyphen;appearing specimens averaged three times more viable symbionts and less than a fourth as many deteriorating symbionts as partly bleached specimens. Foraminifers experimentally exposed to visible light intensities a 13 μmole photon m −2 s −1 for 35 d were statistically similar to partly bleached field specimens in the number and condition of symbionts, and in chamber area occupied by the evaluated host structures. Exposure to 32 °C water temperature at 6–8 μmole photon m −2 s −1 for 28 d induced symbiont loss but did not degrade host endoplasm.",

keywords = "algal symbiosis, conch reef, coral reefs, cytology, electron microscopy, florida keys, photic stress, thermal stress, ultraviolet radiation, zooxanthellae",

author = "Talge, {Helen K.} and Pamela Hallock and Muller, {Pamela Hallock}",

year = "2003",

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doi = "10.1111/j.1550-7408.2003.tb00143.x",

language = "American English",

volume = "50",

journal = "Journal of Eukaryotic Microbiology",

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T1 - Ultrastructural Responses in Field-Bleached and Experimentally Stressed emAmphistegina gibbosa/em (Class Foraminifera)

AU - Talge, Helen K.

AU - Hallock, Pamela

AU - Muller, Pamela Hallock

PY - 2003/1/1

Y1 - 2003/1/1

N2 - Amphistegina are the most common foraminifers with algal endosymbionts found on reefs and carbonate shelves worldwide. Like zooxanthellate corals and other reef organisms with algal symbionts, Amphistegina respond to photoxidative stress by bleaching. This paper documents Ultrastructural changes that occur during bleaching under field and laboratory conditions. Nine chambers from the outer whorl of each of 22 normal&hyphen;appearing and 11 partly bleached specimens of Amphistegina gibbosa , which were collected from Conch Reef, Florida, USA, were examined using transmission electron microscopy. The condition and numbers of algal symbionts, as well as the cell area occupied by 10 other intracellular structures of the host, were quantified. Normal&hyphen;appearing specimens averaged three times more viable symbionts and less than a fourth as many deteriorating symbionts as partly bleached specimens. Foraminifers experimentally exposed to visible light intensities a 13 μmole photon m −2 s −1 for 35 d were statistically similar to partly bleached field specimens in the number and condition of symbionts, and in chamber area occupied by the evaluated host structures. Exposure to 32 °C water temperature at 6–8 μmole photon m −2 s −1 for 28 d induced symbiont loss but did not degrade host endoplasm.

AB - Amphistegina are the most common foraminifers with algal endosymbionts found on reefs and carbonate shelves worldwide. Like zooxanthellate corals and other reef organisms with algal symbionts, Amphistegina respond to photoxidative stress by bleaching. This paper documents Ultrastructural changes that occur during bleaching under field and laboratory conditions. Nine chambers from the outer whorl of each of 22 normal&hyphen;appearing and 11 partly bleached specimens of Amphistegina gibbosa , which were collected from Conch Reef, Florida, USA, were examined using transmission electron microscopy. The condition and numbers of algal symbionts, as well as the cell area occupied by 10 other intracellular structures of the host, were quantified. Normal&hyphen;appearing specimens averaged three times more viable symbionts and less than a fourth as many deteriorating symbionts as partly bleached specimens. Foraminifers experimentally exposed to visible light intensities a 13 μmole photon m −2 s −1 for 35 d were statistically similar to partly bleached field specimens in the number and condition of symbionts, and in chamber area occupied by the evaluated host structures. Exposure to 32 °C water temperature at 6–8 μmole photon m −2 s −1 for 28 d induced symbiont loss but did not degrade host endoplasm.

KW - algal symbiosis

KW - conch reef

KW - coral reefs

KW - cytology

KW - electron microscopy

KW - florida keys

KW - photic stress

KW - thermal stress

KW - ultraviolet radiation

KW - zooxanthellae

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UR - https://doi.org/10.1111/j.1550-7408.2003.tb00143.x

U2 - 10.1111/j.1550-7408.2003.tb00143.x

DO - 10.1111/j.1550-7408.2003.tb00143.x

M3 - Article

VL - 50

JO - Journal of Eukaryotic Microbiology

JF - Journal of Eukaryotic Microbiology

ER -

Ultrastructural Responses in Field-Bleached and Experimentally Stressed emAmphistegina gibbosa/em (Class Foraminifera)

Abstract

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