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In aquatic amphibians, the liver plays only a small role in processing nitrogen for excretion, and ammonia is diffused mainly through the skin.
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aquatic and amphibians
Lacking these membranes, amphibians require water bodies for reproduction, although some species have developed various strategies for protecting or bypassing the vulnerable aquatic larval stage.
Most amphibians lay their eggs in water and have aquatic larvae that undergo metamorphosis to become terrestrial adults.
Larvae and most aquatic adult amphibians excrete the nitrogen as ammonia in large quantities of dilute urine while terrestrial species, with a greater need to conserve water, excrete the less toxic product urea.
Because oxygen concentration in the water increases at both low temperatures and high flow rates, aquatic amphibians in these situations can rely primarily on cutaneous respiration, as in the Titicaca water frog and the hellbender salamander.
The eggs of amphibians are typically laid in water and hatch into free-living larvae that complete their development in water and later transform into either aquatic or terrestrial adults.
Habitat shifts also occur in the developmental life history of amphibians and in insects that transition from aquatic to terrestrial habitats.
The idea that pterosaurs were aquatic animals persisted among a minority of scientists as late as 1830, when the German zoologist Johann Georg Wagler published a text on " amphibians " which included an illustration of Pterodactylus using its wings as flippers.
Unlike amphibians, reptiles do not have an aquatic larval stage.
Ducks exploit a variety of food sources such as grasses, aquatic plants, fish, insects, small amphibians, worms, and small molluscs.
Gills or gill-like organs, located in different parts of the body, are found in various groups of aquatic animals, including mollusks, crustaceans, insects, fish, and amphibians.
An otter is any of 13 living species of semiaquatic ( or in the case of the sea otter, aquatic ) mammals which feed on fish and shellfish, and also other invertebrates, amphibians, birds and small mammals.
Reptiles and amphibians of the valley include the endemic San Joaquin coachwhip snake ( Masticophis flagellum ruddocki ), blunt-nosed leopard lizard ( Gambelia sila ), Gilbert's skink ( Eumeces gilberti ) and the western aquatic garter snake ( Thamnophis couchii ).
Marshes provide habitat for many kinds of invertebrates, fish, amphibians, waterfowl and aquatic mammals.
Measures to improve water flow can disrupt this habitat, and in particular, the replacement of natural banks by artificial confinement greatly reduces the populations of fish, amphibians and aquatic reptiles, and waterside birds are lost.
The primary food for Great Blue Heron is small fish, though it is also known to opportunistically feed on a wide range of shrimp, crabs, aquatic insects, rodents and other small mammals, amphibians, reptiles, and small birds.
Pied-billed Grebes feed mainly on aquatic invertebrates, and also on small fish and amphibians ( frogs, tadpoles ).
Today, artificial flies are tied with a wide variety of natural and synthetic materials ( like mylar and rubber ) to represent all manner of potential freshwater and saltwater fish prey to include aquatic and terrestrial insects, crustaceans, worms, baitfish, vegetation, flesh, spawn, small reptiles, amphibians, mammals and birds, etc.
The best known residents are the giant pandas, but the Zoo is also home to birds, great apes, big cats, asian elephants, insects, amphibians, reptiles, aquatic animals, small mammals and many more.
Prey includes adult and larval insects such as aquatic beetles, dragonflies, damselflies, grasshoppers, crickets, flies and caddisflies, Annelida including leeches, molluscs ( e. g. snails and mussels ), crustaceans ( e. g. crabs and crayfish ) and occasionally fish, amphibians, lizards, small snakes and nestling birds.
The diet includes a wide variety of aquatic animals, including fish, reptiles, amphibians, crustaceans, molluscs and aquatic insects.
In addition to fish, they take a wide range of other aquatic prey, such as molluscs, crustaceans, worms, insect larvae, and amphibians ; more rarely, small mammals and birds may be taken.
This species feeds on aquatic plants and small creatures ( invertebrates, crustaceans and amphibians ) obtained by dabbling.
In earlier times, even biologists did not make a distinction — sixteenth century natural historians classified also seals, whales, amphibians, crocodiles, even hippopotamuses, as well as a host of aquatic invertebrates, as fish.
aquatic and plays
Because the county sits at the headwaters of the Chesapeake Bay along the Susquehanna River, it plays a key role in controlling sediment and fertilizer runoff into the bay as well as fostering submerged aquatic vegetation ( SAV ) regrowth.
Acid dissociation constants are also essential in aquatic chemistry and chemical oceanography, where the acidity of water plays a fundamental role.
In fish, and aquatic vertebrates in general, the cornea plays no role in focusing light, since it has virtually the same refractive index as water.
The complex plays host to the Fergus Devils Jr. C hockey team, the Fergus Highlanders minor hockey association, the Fergus Thistles minor lacrosse association, and the Fergus Flippers aquatic club.
In the United States aquatic toxicology plays an important role in the NPDES wastewater permit program.
" Sea of Love " by Phil Phillips plays while Homer and Marge kiss in the former's aquatic home.
aquatic and only
Alismatales comprise herbaceous flowering plants of aquatic and marshy habitats, and the only monocots known to have green embryos other than the Amaryllidaceae.
Ducklings are particularly vulnerable, since their inability to fly makes them easy prey not only for predatory birds but also large fish like pike, crocodilians, and other aquatic hunters, including fish-eating birds such as herons.
Like almost any herbivore, they will consume many other plants if presented with them, but their diet in nature consists almost entirely of grass, with only minimal consumption of aquatic plants.
A high surface area is crucial to the gas exchange of aquatic organisms as water contains only a small fraction of the dissolved oxygen that air does.
Some aquatic leeches locate hosts by sensing movement and only attach when certain temperature and chemical cues are present.
Daphnia are members of the order Cladocera, and are one of the several small aquatic crustaceans commonly called water fleas because of their saltatory swimming style ( although fleas are insects and thus only very distantly related ).
Hairlessness is only an advantage for aquatic mammals such as whales and dolphins that have spent millions of years adapting to aquatic lifestyles involving diving, fast swimming and migration over long distances ; such animals show considerable skeletal and cardiovascular adaptations to an aquatic environment.
Amphiuma is a genus of aquatic salamanders, the only extant genus within the family Amphiumidae ().
These hydrophytes have small roots and are only found in slow-moving water with rich-nutrient level water Floating aquatic plants are a food resource for avian species.
Environmentalists argue that this may have negative impacts to riparian and aquatic ecosystems, while proponents claim these measures are usually only temporary, since a riverbed is naturally subject to permanent changes during large floods and other events.
This means, that they not only are biodegradable according to OECD 301x test methods, but also the aquatic toxicities ( fish, algae, daphnie ) are each above 100 mg / L.
Trout usually only come to the surface when there is a large bug hatch ( when aquatic insects grow wings and leave the water to mate and lay eggs ).
A few wingless species such as the Lake Tahoe benthic stonefly (" Capnia " lacustra ) or Baikaloperla are the only known insects, perhaps with the exception of Halobates, that are exclusively aquatic from birth to death.
Other than the aquatic play area in front of the Ontario Science Centre ( the centrepiece of Teluscape ), Dundas Square is Toronto's only 24-hour waterplay area, open all day and night except during special events, maintenance, and other exceptions.
It offers exhibits of fishes, reptiles, live coral, aquatic plants and more, including the only freshwater manta ray in captivity in the Americas.
New studies suggests that the juveniles were more aquatic than the adults, and the possibility that Ichthyostega came out of the water only as a fully mature adult.
Temperature-dependent sex determination which cannot function in an aquatic environment, is seen only in terrestrial reptiles.
They have even been known to wade into shallow water for aquatic prey, although this has been only rarely reported.
Only a few aquatic oligochaetes have eyes, and even then they are only simply ocelli.
Of great importance for the biological diversity of the area and the preservation of its climate is the swamp of Agyia, a small and coastal aquatic ecosystem of only, located to the north of the city centre.
In Louisiana, where introduced nutria ( a large aquatic rodent ) are common, they are perhaps the most regular prey for adult alligators, although it is only larger adults alligators that commonly eat this species.
The water spaniels, large and small, differ from the common spaniel only in the roughness of their coats, and in uniting the aquatic propensities of the Newfoundland dog with the fine hunting qualities of their own race.
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