Paludina quadrata var. heudei Dautzenberg & H. Fischer, 1905
Sinotaia aeruginosa (Reeve, 1863)
Sinotaia dispiralis (Heude, 1890)
Sinotaia lapidea (Heude, 1889)
Sinotaia lapillorum (Heude, 1890)
Sinotaia purificata (Heude, 1890)
Sinotaia pyrificata (Heude, 1890)
Sinotaia turrita (Yen, 1939)
Vivipara heudei Dautzenberg & H. Fischer, 1905
Vivipara lapillorum (Heude, 1890)
Vivipara quadrata (W. H. Benson, 1842)
Vivipara quadrata var. fantozatiana (Heude, 1890)
Vivipara quadrata var. purificata (Heude, 1890)
Viviparus quadratus (W. H. Benson, 1842)
Viviparus quadratus aeruginosus (Reeve, 1863)
Viviparus quadratus dispiralis (Heude, 1890)
Viviparus quadratus turritus Yen, 1939
Sinotaia quadrata is a species of a freshwater snail with a gill and an operculum, an aquaticgastropodmollusk in the family Viviparidae. It is widely distributed and common species in China and in northern Vietnam inhabiting various shallow freshwater habitats, where it can reach high densities. It is a keystone species in its habitat and can significantly affect water quality and phytoplankton communities. It is commonly used in Chinese cuisine.
Taxonomy
This species was described under the name Paludina quadrata by English conchologistWilliam Henry Benson in 1842. It is now classified in the genus Sinotaia, although Chinese malacologists use the synonym Bellamya aeruginosa .
Sinotaia quadrata is found in rivers and lakes.[10] It inhabits rice paddies, lakes, pools, slow flowing rivers, streams, ditches, ponds, and canals called khlongs in Vietnam.[2][11] It has a benthic lifestyle and lives mainly in shallow littoral areas,[12] usually in soft mud rich in organic matter.[11] It can actively glide over the sediment or bury into it.[13] This species is not actively migrating, rather its dispersal appears to be caused passively by floods, animals (zoochory), and accidentally by humans.[7] The species prefers water temperatures typical of subtropical habitats, e.g., 6 to 30.1 °C (42.8 to 86.2 °F) in Lake Tai.[13]
Populations can reach densities of up to 400 snails/m2.[11] In Chao Lake, it is the dominant gastropod species with an abundance 2-128 snails/m2 and an average biomass of 87.5 g/m2.[14] It is similarly dominant in Lake Tai.[15]
S. quadrata has been found to respond well to laboratory conditions with a water temperature of 24 °C, pH 8 and a 1:4 ratio of sediment to water.[11]
Populations of S. quadrata at high densities are able to alter the physicochemical features of water. They decrease the concentration of chlorophyll a and thus directly increase water transparency. This indirectly decreases the concentration of dissolved oxygen through consumption of oxygen-producing algae.[12] The species affects the composition of the phytoplankton community by decreasing the biomass of mostly toxic cyanobacteria and flagellates and promoting the biomass of mostly colonial green algae.[16][12] Nitrogen concentrations may also be decreased.[16] Its pronounced effect on water chemistry and community composition makes S. quadrata a keystone species in its habitat.[8]
S. quadrata breathes with gills. The right tentacle is thickened in the male but not the female.[11] The dry weight of composition of this species is as follows: 28.6% foot, 23.06% intestine, 9.78% gonad, 8.58% hepatopancreas, 29.98% other tissue.[18] The diploid chromosome number of Sinotaia quadrata is 2n=16.[19]
The height of the shell is 20–30 mm (0.79–1.18 in), with both sexes having identical shell dimensions. Adults snails have shell of greater height than width. The shells of newborn snails are 2.93–3.70 mm (0.115–0.146 in) long, and differ from those of adults in being wider than high.[11] The snail including the shell has a weight of about 2.8 g.[16]
Sinotaia quadrata has strong fecundity.[10] It is gonochoristic, which means that each individual animal is distinctly male or female.[7] The species is ovoviviparous.[21] Newborn snails attach to non-sediment substrates (shells of adults or other material) in their first 2–3 days.[11]
The shell length of juvenile snails starts at about 3 mm and grows rapidly by about 190 μm daily. Juveniles become adults at the age of nine weeks, when they reach a shell height of 12.15–16.09 mm; from then on, they grow more slowly at about 30 μm daily. Snails can be reliably sexed at this age.[11]
Individuals start mating and reproducing in at water temperatures of 16–18 °C, although a temperature of 24–26 °C is optimal. Females start to give birth to the first newborn snails at the age of 18 weeks, when they reach a shell height of 15–16 mm and a body weight of 0.81–0.94 g.[11][21]Gravidity of adult females lasts the entire year.[11] The average number of newborn snails in the wild is 0.24 snails per day (50 per year)[11][21] or up to 0.55 snails per day in the laboratory.[11] Each gravid female carries 19–21 embryos inside her.[11]
Predators of the species include the black carpMylopharyngodon piceus; S. quadrata is one of the main food sources for this fish, making it important in the freshwater food chain.[11]
This species is also eaten by humans. In Isan, Thailand they are collected by hand or with a handnet from canals, swamps, ponds and flooded rice paddy fields during the rainy season. During the dry season, snails live under dried mud. Collectors use a spade to scrape the ground to find and catch them. Generally they are collected by both men and women.[4] The snails are then cleaned and cooked in a curry. They are also parboiled in salted water and eat together with green papaya salad.[4]S. quadrata is commonly sold in markets and restaurants in China[44] and constitutes one of the three predominant freshwater snails found in Chinese markets,[38] where it is considered a delicacy.[18] The species is also used as feed in crab culture[24] as well as fish, poultry and livestock raising.[2] The annual production of S. quadrata in Chao Lake in 2002 amounted to 28 084 t.[24] Although harvesting pressure in China is high, the high genetic diversity suggests that the species is currently not negatively affected by it.[7]
References
This article incorporates CC-BY-2.0 text from reference.[4]
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