نتایج جستجو برای: rugose corals
تعداد نتایج: 5358 فیلتر نتایج به سال:
Elevated sea surface temperatures (SSTs) are linked to an increase in the frequency and severity of bleaching events due to temperatures exceeding corals' upper thermal limits. The temperatures at which a breakdown of the coral-Symbiodinium endosymbiosis (coral bleaching) occurs are referred to as the upper thermal limits for the coral species. This breakdown of the endosymbiosis results in a r...
While reef degradation is occurring worldwide, it is not uncommon to see phase shifts from coral to macroalgal dominated reefs. Numerous studies have addressed the mechanisms by which macroalgae may outcompete corals and a few recent studies highlighted the putative role of bacteria at the interface between macroalgae and corals. Some studies suggest that macroalgae may act as vectors and/or fo...
Despite the perception that corals and coral reefs are limited to stable habitats distinguished by very narrow environmental parameters, the coral–algal symbiosis is capable of surviving under a variety of extreme conditions. Through the process of photoadaptation, corals and their algal symbionts adjust algal densities and pigment concentrations to function over a wide range of light levels ra...
A review of published literature on the sensitivity of corals to turbidity and sedimentation is presented, with an emphasis on the effects of dredging. The risks and severity of impact from dredging (and other sediment disturbances) on corals are primarily related to the intensity, duration and frequency of exposure to increased turbidity and sedimentation. The sensitivity of a coral reef to dr...
Reliably predicting how coral calcification may respond to ocean acidification and warming depends on our understanding of coral calcification mechanisms. However, the concentration and speciation of dissolved inorganic carbon (DIC) inside corals remain unclear, as only pH has been measured while a necessary second parameter to constrain carbonate chemistry has been missing. Here we report the ...
Off the coast of Vietnam, two recent events seem to have contributed death coral reefs: rapid invasion a small marine snail called Drupella, and emergence disease that spreads over corals. We decided investigate whether there is link between corals, snails, disease. analyzed mucus covering surface both in healthy corals those infested by Drupella snails. Mucus produced usually full helpful micr...
We assessed the uptake rates of nitrate by the scleractinian coral Stylophora pistillata by following 15N from seawater into the coral tissue. Two sets of corals were first prepared, with ‘‘nitrate-enriched’’ corals grown in 5 mmol L21 NO and control corals grown in #1 mmol L21 NO . Uptake rates at 0.3 and 3 mmol L21 [15N]NO 2 2 2 3 3 3 were then measured. Most of the %15N enrichment occurred i...
In this work, morphological and anatomical features of seeds 15 Alyssum taxa (A. caricum, A. davisianum, filiforme, haussknechtii, murale subsp. var. murale, simplex, sibiricum, desertorum, hirsutum hirsutum, minutum, strictum, strigosum strigosum, szowitsianum, dasycarpum linifolium linifolium) from Turkey were examined with the cluster analysis, systematic importance these characteristics was...
In Vibrio cholerae, the second messenger 3',5'-cyclic diguanylic acid (c-di-GMP) regulates several cellular processes, such as formation of corrugated colony morphology, biofilm formation, motility, and virulence factor production. Both synthesis and degradation of c-di-GMP in the cell are modulated by proteins containing GGDEF and/or EAL domains, which function as a diguanylate cyclase and a p...
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