Osmoregulation in anthozoan–dinoflagellate symbiosis

Mayfield, Anderson B.; Gates, Ruth D.

doi:10.1016/j.cbpa.2006.12.042

Cited by 124 publications

(119 citation statements)

References 72 publications

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“…The close proximity of the reef tract to the passes interspersed throughout the Middle Keys allows water from Florida Bay to flow into the Atlantic, bathing the reef system in warmer, hyper-saline waters in the dry season (Precht & Miller 2007) and hypo-saline water in the wet season (Precht & Miller 2007, Wagner et al 2008. During thermal stress events these osmotic extremes may couple to exacerbate the bleaching response (Mayfield & Gates 2007). Salinity concentrations distinctly explained some of the bleaching prevalence in the present study, during 2006 and 2007 (Table 6).…”

Section: Discussionmentioning

confidence: 55%

“…For example, low salinity causes osmotic shock that leads to host-cell detachment of symbionts after heavy rains (van Woesik et al 1995), yet, thermal stress also changes the osmotic capacity of corals (Mayfield & Gates 2007), and both disturbances can, in extreme cases, lead to host-cell detachment, although the causative agents differ (Gates et al 1992). It is likely that habitat differences, or seasonal changes in salinity, affects the osmotic capacity of corals, which, in turn, also influences their susceptibility to thermal stress.…”

Section: Abstract: Bleaching · Temperatures · Corals · Coral Reefs ·mentioning

confidence: 99%

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Species composition, habitat, and water quality influence coral bleaching in southern Florida

Wagner¹,

Kramer²,

Woesik³

2010

Mar. Ecol. Prog. Ser.

122

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Section: Discussionmentioning

confidence: 55%

Section: Abstract: Bleaching · Temperatures · Corals · Coral Reefs ·mentioning

confidence: 99%

Species composition, habitat, and water quality influence coral bleaching in southern Florida

Wagner¹,

Kramer²,

Woesik³

2010

Mar. Ecol. Prog. Ser.

122

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“…In wallless cells, adjustment in cell volume for osmoregulation occurs continuously and is considered a basic biological function that allows for equilibrium between intracellular and extracellular solute concentrations (30,31). In contrast, response to osmotic stress requires an additional energy expense, such as an increase in organic osmolytes or use of ion transport (30)(31)(32). Osmolytic metabolite adjustment may be accomplished by synthesis or elimination of osmolytes, such as glycerol (30,32).…”

Section: Discussionmentioning

confidence: 99%

Osmotic stress triggers toxin production by the dinoflagellate Karenia brevis

Errera¹,

Campbell

2011

Proc. Natl. Acad. Sci. U.S.A.

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With the increase in frequency of harmful algal blooms (HABs) worldwide, a better understanding of the mechanisms that influence toxin production is needed. Karenia brevis , the major HAB dinoflagellate in the Gulf of Mexico, produces potent neurotoxins, known as brevetoxins. Human health is directly impacted by blooms of K. brevis through consumption of shellfish contaminated by accumulated brevetoxins (neurotoxic shellfish poisoning) or from aerosolized brevetoxins in sea spray (reduced respiratory function); however, the reason for brevetoxin production has remained a mystery. Here we show that brevetoxin production increased dramatically in response to osmotic stress in three of the four K. brevis clones examined. By rapidly changing salinity to simulate a shift from oceanic conditions to a decreased salinity typical of coastal conditions, brevetoxin production was triggered. As a result, brevetoxin cell quota increased by >14-fold, while growth rate remained unchanged. Live images of K. brevis cells were also examined to assess changes in cell volume. In the K. brevis Wilson clone, cells responded quickly to hypoosmotic stress by increasing their brevetoxin cell quota from ∼10 to 160 pg of brevetoxin per cell, while cell volume remained stable. In contrast, the K. brevis SP1 clone, which has a consistently low brevetoxin cell quota (<1 pg per cell), was unable to balance the hypoosmotic stress, and although brevetoxin production remained low, average cell volume increased. Our findings close a critical gap in knowledge regarding mechanisms for toxin production in K. brevis by providing an explanation for toxin production in this harmful dinoflagellate.

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“…From the MANOVA, MDS analysis, and, albeit less so, PCA, it is clear that corals of the four sampling times possessed unique gene expression+biological composition signatures, and this temporal change in the molecular phenotype of these samples may be related to the complex, dualcompartmental metabolism displayed by organisms, such as reef-building corals, that have acquired the capacity for photosynthesis via symbiosis [29][30]. Specifically, coral metabolism is temporally variable due to the periodic nature of light-driven photosynthesis [30][31][32], and metabolic hysteresis driven by dinoflagellate photosynthesis as a function of the light cycle surely contributed to the temporal variation observed in the SHSTTE.…”

Section: Discussionmentioning

confidence: 99%

Uncovering Spatio-Temporal and Treatment-Derived Differences in the Molecular Physiology of a Model Coral-Dinoflagellate Mutualism with Multivariate Statistical Approaches

Mayfield

2016

Preprint

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Multivariate statistical approaches (MSA), such as principal components analysis and multidimensional scaling, seek to uncover meaningful patterns within datasets by considering multiple response variables in a concerted fashion. Although these techniques are readily used by ecologists to visualize and explain differences between study sites, they could theoretically be employed to differentiate organisms within an experimental framework while simultaneously identifying response variables that drive documented experimental differences. Therefore, MSA were used herein to attempt to understand the response of the common, Indo-Pacific reef coral Seriatopora hystrix to temperature changes using data from laboratory-based temperature challenge studies performed in Southern Taiwan. Gene expression and physiological data partitioned experimental specimens by time of sampling, treatment temperature, and site of origin upon employing MSA, signifying that S. hystrix and its dinoflagellate endosymbionts display physiological and molecular signatures that are characteristic of sampling time, site of colony origin, and/or temperature regime. These findings promote the utility of MSA for documenting biologically meaningful shifts in the physiological and/or sub-cellular response of marine invertebrates exposed to environmental change.

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Osmoregulation in anthozoan–dinoflagellate symbiosis

Cited by 124 publications

References 72 publications

Species composition, habitat, and water quality influence coral bleaching in southern Florida

Species composition, habitat, and water quality influence coral bleaching in southern Florida

Osmotic stress triggers toxin production by the dinoflagellate Karenia brevis

Uncovering Spatio-Temporal and Treatment-Derived Differences in the Molecular Physiology of a Model Coral-Dinoflagellate Mutualism with Multivariate Statistical Approaches

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