| Autor: |
Carmona Jiménez, Javier, Beltrán Magos, Yenny, Salinas Camarillo, Victor Hugo |
| Zdroj: |
Diatom Research; April 2017, Vol. 32 Issue: 2 p185-193, 9p |
| Abstrakt: |
The morphological and environmental characteristics of the genus Terpsinoëwere assessed from five populations from tropical streams in central Mexico. Four populations of Terpsinoë musicawere characterized by one eccentric rimoportula with a short stalk. Only one population was characterized by one to three eccentric rimoportulae. For the first time the external process known as a rota is described for this genus, a taxonomic character employed to differentiate genera and species in other members of the Biddulphiaceae. Populations of T. musicaoccurred in warm freshwater habitats (20–29°C), neutral to slightly alkaline waters (pH 7–8), with medium to high ionic content (specific conductance 268–2640 μS cm−1) and dominance of sulphate/bicarbonate and calcium/magnesium. Highest abundances occurred in microhabitats at shallow depths, with variable water flux, low to medium irradiance on the bedrock, suggesting that T. musicais an abundant fresh hard-water species, even though it could be found over a wide range of conditions. The morphological analysis identified all the studied populations as T. musica.However, the morphological and morphometric variation found in these populations suggests ecophenotypic variation, broadening the taxonomic characteristics of this species. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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