Sentences with word «zooxanthellae»

«shuffling» — changes in the relative abundance of zooxanthellae clades that are already present in the coral tissue

Coral and algae called zooxanthellae live in a mutual help relationship.

Yes, they are bivalves, but species in the genus Tridacna might as well be treated as hard corals since their mantles contain symbiotic zooxanthellae algae similar to that in corals.

Under normal conditions, corals have a symbiotic relationship with algae known as zooxanthellae.

«A significant negative shift in δ13C just prior to mortality surfaces and growth discontinuities indicated a reduced photosynthetic intensity of symbiotic zooxanthellae.

The ability to associate with multiple zooxanthellae clades is common in corals.

This is a multiple - level symbiosis because corals house the entire chloroplast - containing zooxanthellae cells within their tissue.

Sphenopus exilis, the lone wolf of the sea: Zoantharians, a type of sea anemone, are known for living in colonies and harboring single - celled zooxanthellae in symbiotic relationships.

Information on abundance of clade D zooxanthellae can help managers understand the susceptibility of specific corals to thermal stress and also to identify changes in coral reef health.

Changes in the dominant zooxanthellae types of a coral colony may occur through two processes:

Without zooxanthellae coral tissue becomes transparent, revealing the white coral skeleton beneath it.

What was done Intrigued by these new and diverse findings, Takahashi and Kurihara measured the rates of calcification, respiration and photosynthesis of the tropical coral Acropora digitifera — along with the coral's zooxanthellae density — under near - natural summertime temperature and sunlight conditions for a period of five weeks.

«What are mechanisms of zooxanthella expulsion from coral?.»

This isn't the helpful zooxanthellae algae that sustains the coral, but a different species that actually contests with the corals for real estate on the reefs.

The aforementioned research group demonstrated that the expulsion of zooxanthellae at 27 °C (non-thermal stress conditions) is part of a regulatory mechanism that maintains zooxanthellal density and a stable carbon concentration with expulsion of digested or normal forms of symbionts.

This research group demonstrated that corals more actively digest and expel damaged symbiotic zooxanthellae under conditions of thermal stress, and that this is likely to be a mechanism that helps corals to cope with environmental change.

However, under thermal stress, the accumulation of damaged cells may exceed the increased rate of expulsion of digested zooxanthella.

If data are available, use physiological studies of dominant corals to assess likely resistance and tolerance based on zooxanthellae type, photo - protective pigments, or tissue condition (lipid levels), and / or heterotrophic capacity.

More heat - resistant zooxanthellae may come with ecological costs, such as reduced growth and reduced reproductive ability, and hence lower recovery following damage.

The loss of zooxanthellae makes the white calcium carbonate coral skeleton visible through the transparent tissue, making the coral appear bright white or «bleached».

«With the instrument we're able to observe things as small as individual zooxanthellae, and those are symbiotic algae that live inside coral polyps.

Where a healthy coral polyp might have up to two million zooxanthellae per square centimetre, numbers may drop to 200,000 in a bleaching event.

When corals are exposed to elevated ocean temperatures they are susceptible to bleaching — which means that they expel the colorful zooxanthellae algae they need to survive — and while some corals may survive a bleaching event, many will die.

Some polyps may be able to obtain enough food on their own and some may be able to obtain new zooxanthellae.

Those symbionts (aka zooxanthellae) typically provide ~ 90 % of the coral's energy needs.

Bleaching occurs when overly warm water leads corals to expel symbiotic algae called zooxanthellae.

These heat waves can cause coral bleaching (SN: 02/03/18, p. 16)-- corals eject the symbiotic algae known as zooxanthellae that provide corals with both nutrients and color.

These results demonstrate the magnitude of trade - offs likely to be experienced by this species as they acclimatize to warmer conditions by changing to more thermally tolerant clade D zooxanthellae.

Most reef - building corals contain zooxanthellae, which are single - celled dinoflagellates that live within the coral's tissue.

The nutrients are believed to disrupt the symbiotic relationship that normally exists between the coral and zooxanthellae algae.

On the other hand, if the stressful conditions prevail, accumulation of the damaged symbiotic zooxanthellae may not maintain the expulsion, which will gradually accumulate in coral tissues.

These researchers consider that this loss of zooxanthellae and the accumulation of damaged cells results in coral bleaching.

Coral bleaching happens when sea temperatures rise, causing the breakdown of the symbiosis between coral and their zooxanthellae (the microscopic plants which gives coral most of its colour), which can be fatal for the coral.

«We should know about the density of the zooxanthellae within six weeks,» says Andrew Steven, a researcher from the reef authority.

Some species, called zooxanthellae, are endosymbionts of marine animals and protozoa, and play an important part in the biology of coral reefs.

The symbiosis between corals and zooxanthellae (dinoflagellate genus Symbiodinium) form the foundation of coral reef biology.

More photosynthetically damaged zooxanthellae were observed upon prolonged exposure to thermal stress, and were released by corals without digestion, therefore preventing their accumulation.

In this study, we used ribosomal RNA gene sequencing to identify the zooxanthellae, bacteria and archaea associated with healthy and yellow band diseased (YBD) colonies in the Media Luna reef of La Parguera, Puerto Rico, in order to examine the influence of YBD on the Montastraea faveolata microbiome.

Corals such as the one depicted below have a symbiosis with multiple single - celled organisms called zooxanthellae.

Studies have revealed that the different clades of zooxanthellae have different susceptibilities to thermal and light stress.

The term «zooxanthellae» refers to a wide variety of algae of the genus Symbiodinium.

In the short term, corals with flexible symbioses may shuffle or switch zooxanthellae; and an increase in the abundance of thermally tolerant zooxanthellae strains (such as those of clade D) is expected with an increasing frequency of bleaching conditions.

ref The selective exchange of zooxanthellae is a potential mechanism by which corals might survive climate stressors, such as increased sea temperatures.

The potential to adapt to increasing sea - surface temperatures depends on the extent of genetic variation for heat tolerance, the generation time of the coral host and zooxanthellae, and the strength of selection.

The coral, in return, provides the zooxanthellae with nutrients and a protected environment.