Topic
Sphaerium nucleus
About: Sphaerium nucleus is a research topic. Over the lifetime, 6 publications have been published within this topic receiving 28 citations.
Papers
TL;DR: Molecular results indicate that in the context of the Evolutionary species Concept the S. nucleus morphospecies may represent a complex of separate taxa, however referring on the Biological Species Concept the genetic lineages could represent the intraspecific variability.
Abstract: Chromosome, 16S and ITS1 rDNA sequence analyses were used to obtain reliable diagnostic characters and to clarify phylogenetic relationships of sphaeriid bivalves of the genus Sphaerium. The species studied were found to be diploid, with modal number 2n = 28 in S. nucleus and 2n = 30 in S. corneum var. mamillanum. Small, biarmed, C- negative B chromosomes were found in all studied populations of both species. Karyological and molecular markers revealed no differences between S. corneum s. str. and S. corneum var. mamillanum. No intraspecific differences were found in the basic karyotype of S. nucleus. Molecular analyses, however, uncovered three genetically distinct ITS1 lineages: one comprised of samples from Lithuania, Slovakia, and Russia, another from Czech, and a third from Ukraine. Additionally to known 16S haplotype from Ukraine, three new 16S haplotypes of S. nucleus were detected: one in the samples from Lithuania and Russia, one in Slovakian and one in Czech population. In the ITS1 phylogenetic tree, all branches of S. nucleus clustered in one clade. In the 16S phylogenetic tree, however, the haplotype of Czech S. nucleus formed a separate branch, distant from three other haplotypes of S. nucleus. Molecular results indicate that in the context of the Evolutionary Species Concept the S. nucleus morphospecies may represent a complex of separate taxa, however referring on the Biological Species Concept the genetic lineages could represent the intraspecific variability.
15 citations
TL;DR: If the mussels benefit from the interaction through, for example, enhanced dispersal then the relationship between the two taxa represents a novel form of parasitism.
Abstract: Small freshwater mussels are sometimes found attached to the toes of aquatic phase amphibians, but the ecological implications of this interspecific relationship are unknown. Toe condition and mussel presence were recorded for newts caught in 37 ponds in Luxembourg between March and June 2007. All four local newt species were affected ( Lissotriton helveticus, L. vulgaris, Mesotriton alpestris and Triturus cristatus ), primarily by the mussel Sphaerium nucleus but also by Pisidium subtruncatum . Mussel attachment was observed in three ponds, with a particularly high occurrence in one pond, where 23% of newts were affected and significantly more toes were damaged than in other ponds. Mussels caused local tissue and bone damage to their host and may interfere with egg-laying. Twenty-two newts with attached mussels were observed in aquaria for up to 3 days: 13 mussels detached when the newt's toe fell off and nine remained attached. If the mussels benefit from the interaction through, for example, enhanced dispersal then the relationship between the two taxa represents a novel form of parasitism.
14 citations
9 Nov 2017
TL;DR: One species is new for the regional fauna (Sphaerium nucleus ), another three are rare and their range is strictly limited to a few localities (Musculium lacustre, Bythinella sp. and Terrestribythinella baidashnikovi ).
Abstract: One species is new for the regional fauna ( Sphaerium nucleus ), another three are rare and their range is strictly limited to a few localities ( Musculium lacustre , Bythinella sp. and Terrestribythinella baidashnikovi ). It is discovered one additional locality of alien species Sinanodonta woodiana recently introduced into the Transcarpathian. Images of the shells, comments on taxonomy, distribution and ecology of these species are provided.
6 citations
1 Jan 2008
TL;DR: In this paper, the distribution of Sphaerium nucleus in the Czech Republic is summarized and used in an attempt to evaluate its conservation status, showing that S. nucleus was found at 40 sites, mostly shallow small water bodies situated in lowland river alluviums.
Abstract: Recent data about the distribution of Sphaerium nucleus in the
Czech Republic are summarized and used in an attempt to
evaluate its conservation status. During the last ten years,
this species was found at 40 sites, mostly shallow small water
bodies situated in lowland river alluviums. These types of
habitats are generally endangered due to the huge human impact
and exploration of these areas. The revision of voucher
specimens of Sphaerium corneum s.lat. deposited in museum
collections yielded a further 22 old records of S. nucleus.
3 citations
11 Mar 2020
TL;DR: In the years 2005-2019, 34 species were found at 29 sites and only old shells of two bivalves (Unio crassus, U. tumidus) were found.
Abstract: The Žehuňský rybnik National
Nature Monument (Central Bohemia, Czech Republic) contains a pond
(258 ha) with extensive wetlands in its surroundings. Aquatic
molluscs of this area were studied in years 2005–2019. Altogether,
34 species were found at 29 sites. Anisus vortex, Planorbis
planorbis, Valvata cristata, Stagnicola turricula, Bithynia
tentaculata, Bathyomphalus contortus and Planorbarius corneus
belonged to the most often recorded species, while 16 species were
found at only 1–3 sites. Only old shells of two bivalves (Unio
crassus, U. tumidus) were found. Rare and endangered bivalves
Sphaerium nucleus and Pisidium pseudosphaerium inhabit large area
of the wetlands. One non-native species, Ferrissia californica,
was found.
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2020 | 1 |
| 2018 | 1 |
| 2017 | 1 |
| 2008 | 2 |
| 2006 | 1 |