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Calcareous in Biological News

Major study concludes that global warming is killing off coral

... acidification, which adds a new threat: the inability of corals to create calcareous skeletons," said Harvell. "Acidification actually threatens all marine animals and plants with calcareous skeletons, including corals, snails, clams and crabs. Our study shows that ...

Coralline algae in the Mediterranean lost their tropical element between 5 and 7 million years ago

... Mediterranean Sea (in Salento, Italy and Almera, Spain) by way of a fossil register of 21 species collected in the two areas. "Coralline algae are calcareous algae that are very common nowadays, although unknown to the general public, including naturalists, and quite often in fossil form, particularly in ...

The making of Dig It! the Secrets of Soil exhibit

... is black clay with slickensides grading to containing calcium carbonates; substratum is light olive brown clay; form under prairie vegetation in calcareous clays and marls Houston Black soils can be used for cropland - grain sorghum, cotton, corn, small grain, forage grasses; high shrink swell limits ...

Acid oceans warning

... CO 2 levels were increased in the air of tanks containing corals, had showed it caused some corals to cease forming skeletons. More alarmingly, red calcareous algae the glue that holds the edges of coral reefs together in turbulent water actually began to dissolve. The risk is that this may begin to erode ...
Calcareous in Biological Definition

Skeleton

... both have exoskeletons. Since exoskeletons necessarily limit growth, phyla with exoskeletons have come up with various solutions. Most molluscs have calcareous shells and as they grow, the diameter of the shell is enlarged without altering its shape. On the other hand, arthropods shed their exoskeletons to ...
Calcareous in Biological Dictionary

Calcareous algae

... biotic processes dominated by corals and calcareous algae . ... Corals and calcareous algae grow on top of one another and form a three ... calcareous , algae ,biological ,biology dictionary,biology ...

Operculum

... The operculum , meaning little lid, is a corneous or calcareous structure which exists in some groups of marine, freshwater, but not in terrestrial snails or gastropods. It is present in most but not all ...

Madreporite

... to an obviously reduced activity of ... droebachiensis with an obstructed madreporite , fed ad libitum, had significantly ... stone canal n. A calcareous duct in echinoderms that leads from the madreporite to a ring-shaped canal around the ... madreporite (invertebrate zoology) ring ... ...

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