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Cryptic diversity with wide salinity tolerance in the putative euryhaline Testudinella clypeata (Rotifera, Monogononta)
Leasi, F.; Tang, C.Q.; De Smet, W.H.O.; Fontaneto, D. (2013). Cryptic diversity with wide salinity tolerance in the putative euryhaline Testudinella clypeata (Rotifera, Monogononta). Zool. J. Linn. Soc. 168(1): 17-28. hdl.handle.net/10.1111/zoj.12020
In: Zoological Journal of the Linnean Society. Academic Press: London. ISSN 0024-4082, more
Peer reviewed article  

Available in Authors 
    VLIZ: Open Repository 248263 [ OMA ]

Keywords
    Aquatic organisms; Ecological distribution; Euryhaline species; Geographical distribution; Meiofauna; Salt water; Taxonomy; Brachionus plicatilis Müller, 1786 [WoRMS]; Testudinella clypeata (Müller, 1786) [WoRMS]; Marine; Brackish water
Author keywords
    DNA taxonomy; Ecological tolerance; Generalized mixed Yule coalescent (GMYC) model; Microscopic organisms; Traditional taxonomy

Authors  Top 
  • Leasi, F.
  • Tang, C.Q.
  • De Smet, W.H.O., more
  • Fontaneto, D.

Abstract
    Aquatic faunas in fresh, brackish, and salt waters are usually well defined and differ amongst these three habitats. Nonetheless, some animals are known to be euryhaline, namely present across wide salinity ranges. The wide tolerance of putative euryhaline species has, however been refuted in some cases by DNA taxonomy, which has uncovered cryptic diversity with narrow ecological niches. We aim to improve knowledge on the putative euryhalinism of microinvertebrates and test whether it might actually be a real phenomenon or if euryhaline species are mostly a consequence of our previous inability to identify cryptic species with narrow salinity ranges, as discovered in Brachionus plicatilis. Using morphological analyses and DNA taxonomy, we investigated the species reality and distribution of a putative euryhaline rotifer species, Testudinella clypeata, and evaluated whether cryptic species are ecologically and/or geographically segregated. Different DNA taxonomy approaches concurred in revealing the presence of seven cryptic species within the T.?clypeata morphospecies, which, in contrast to what has been previously detected, are actually euryhaline. Moreover, differences in analysed morphological traits were not significantly different amongst cryptic species. This suggests that DNA taxonomy improves our estimates of the actual diversity of microscopic species, in contrast to the morphological approach.

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