Elasmobranchs are exclusively
A) Fresh water forms
B) Marine water forms
C) Brackish water forms
D) None of these
Answers
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Answer:
A) Fresh water forms
Explanation:
Elasmobranchs are basically a marine taxon, however we recognise numerous species that stay in freshwater surroundings (about 60 species which constitute simplest 5% of the 1154 defined species). They may be divided into groups.
The euryhaline elasmobranchs, which might be marine species which can live on and reproduce in freshwater surroundings, and the obligated freshwater elasmobranchs. The 2nd organization includes elasmobranchs that simplest lives in freshwater surroundings their complete life. This organization includes simplest one clade: the subfamily Potamotrygoninae. This clade is endemic to at least one precise region (this means that that they could simplest be visible in the ones regions): tropical, subtropical water and wetland of South America.
Recent researches in Paraná river have proven that obligated freshwater elasmobranchs have been greater liable to anthropogenic threats as overfishing and destruction of habitats because of the very small location they stay in in comparison to the marine species.
New studies has highlighted the significance of coastal wetlands, like mangroves and seagrasses, as habitats for plenty species of elasmobranch.
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