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Wild guppies feed on algal remains, diatoms, invertebrates, zooplankton, detritus, [45] plant fragments, mineral particles, aquatic insect larvae, and other sources. Algal remains constitute the biggest proportion of wild guppy diet in most cases, but diets vary depending on the specific conditions of food availability in the habitat.
A Brazilian legend called "piranha cattle" states that they sweep the rivers at high speed and attack the first of the cattle entering the water allowing the rest of the group to traverse the river. [42] These legends were dismissed through research by Hélder Queiroz and Anne Magurran and published in Biology Letters. [43]
A large amount of detritus is used as a source of nutrition for animals. In particular, many bottom feeding animals living in mud flats feed in this way. In particular, since excreta are materials which other animals do not need, whatever energy value they might have, they are often unbalanced as a source of nutrients, and are not suitable as a ...
The largest living land animal, the African bush elephant, is a herbivore. This is a list of herbivorous animals, organized in a roughly taxonomic manner. In general, entries consist of animal species known with good certainty to be overwhelmingly herbivorous, as well as genera and families which contain a preponderance of such species.
When a species is removed from a river ecosystem the intensity of the effect is related to the connectedness of the species to the food web. [38] An invasive species could be removed with little to no effect, but if important and native primary producers, prey or predatory fish are removed you could have a negative trophic cascade . [ 38 ]
An adult manatee will commonly eat up to 10–15% of its body weight, or 50 kilograms (110 lb), per day, which requires the manatee to graze for several hours per day. [49] By contrast, 10% of the diet of the African manatee is fish and mollusks. [50] Manatees have been known to eat small amounts of fish from nets. [51]
Kleiber's law describes the relationship between an animal's size and its feeding strategy, saying that larger animals need to eat less food per unit weight than smaller animals. [21] Kleiber's law states that the metabolic rate (q 0) of an animal is the mass of the animal (M) raised to the 3/4 power: q 0 =M 3/4
Gars are sometimes referred to as "garpike", but are not closely related to pike, which are in the fish family Esocidae. All of the gars are relatively large fish, but the alligator gar ( Atractosteus spatula ) is the largest; the alligator gar often grows to a length over 2 m (6.5 ft) and a weight over 45 kg (100 lb), [ 5 ] and specimens of up ...