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The garganey (Spatula querquedula) is a small dabbling duck.It breeds in much of Europe and across the Palearctic, but is strictly migratory, with the entire population moving to Africa, India (in particular Santragachi), Bangladesh (in the natural reservoirs of Sylhet district) and Australasia during the winter of the Northern hemisphere, [2] where large flocks can occur.
The pelagic food web, showing the central involvement of marine microorganisms in how the ocean imports nutrients from and then exports them back to the atmosphere and ocean floor. A marine food web is a food web of marine life. At the base of the ocean food web are single-celled algae and other plant-like organisms known as phytoplankton.
From shallow waters to the deep sea, the open ocean to rivers and lakes, numerous terrestrial and marine species depend on the surface ecosystem and the organisms found there. [1] The ocean's surface acts like a skin between the atmosphere above and the water below, and hosts an ecosystem unique to this environment.
CO 2 (g) + H 2 O(l) ⥨ H 2 CO 3 (aq) H 2 CO 3 (aq) ⥨ HCO 3 − (aq) + H + (aq) HCO 3 − (aq) ⥨ CO 3 2− (aq) + H + (aq) This series of reactions governs the pH levels in the ocean and also dictates the saturation state of seawater, indicating how saturated or unsaturated the seawater is with carbonate ions. Consequently, the saturation ...
Pomacanthus imperator, the emperor angelfish; [3] [4] Lactophrys bicaudalis, the spotted trunkfish; [5] and Stephanolepis hispidus, the planehead filefish [6] are known spongivorous coral reef fish. The rock beauty Holocanthus tricolor is also spongivorous, with sponges making up 96% of their diet.
They are 16–18 cm (6.3–7.1 in) in length, and are similar to the only slightly larger little crake. Baillon's crake has a short straight bill, yellow or green without a red base. Adults have mainly brown upperparts with some white markings, and a blue-grey face and underparts. The rear flanks are barred black and white.
The tiny (0.6 μm) marine cyanobacterium Prochlorococcus, discovered in 1986, forms today an important part of the base of the ocean food chain and accounts for much of the photosynthesis of the open ocean [140] and an estimated 20% of the oxygen in the Earth's atmosphere. [141]
They are small insects with a body that is up to 6.5 mm (0.26 in) long and 3 mm (0.12 in) broad, [1] and a leg span up to at least 15 mm (0.59 in). [2] They lack wings, have long antennae, short front legs used for catching prey (and, in the male, for holding the female during mating), long middle legs used for propulsion, and somewhat shorter ...