Reconstructing the natural distribution of individual unionid mussel species and species diversity in wadeable streams of Illinois, USA, with reference to stream bioassessment

2017 ◽  
Vol 36 (3) ◽  
pp. 669-682 ◽  
Author(s):  
Yong Cao ◽  
Kevin Cummings ◽  
Leon Hinz ◽  
Sarah A. Douglass ◽  
Alison P. Stodola ◽  
...  
Keyword(s):  
Species Diversity ◽  
Natural Distribution ◽  
Mussel Species ◽  
Wadeable Streams ◽  
Stream Bioassessment

scholarly journals Comparative phylogeography of the freshwater mussels of the southeastern United States: reconstructing historic drainages using molecular data

2021 ◽  
Author(s):  
Scott T. Small ◽  
John P. Wares
Keyword(s):  
United States ◽  
Species Diversity ◽  
Phylogenetic Trees ◽  
Gulf Coast ◽  
Freshwater Mussels ◽  
Southeastern United States ◽  
Recent Common Ancestor ◽  
Mussel Species ◽  
Most Recent Common Ancestor ◽  
Allopatric Divergence

AbstractKnowledge of species ages and their distribution enhance our understanding of processes that create and maintain species diversity at both local and regional levels. The largest family of freshwater mussels (Unionidae), reach their highest species diversity in drainages of the southeastern united states. By sequencing multiple loci from mussel species distributed throughout the drainages in this region, we attempt to uncover historical patterns of divergence and determine the role of vicariance events on the species formation in mussels and extend our hypothesis to freshwater animals in general. We analyzed 346 sequences from five genera encompassing 37 species. Species were sampled across 12 distinct drainages ending either in the Atlantic Ocean or the Gulf of Mexico. Overall the topologies of the different genera returned phylogenetic trees that were congruent with geographically contiguous drainages. The most common pattern was the grouping between the Atlantic slope and gulf coast drainages, however the Tennessee drainage was often the exception to this pattern grouping with the Atlantic slope. Most mussel species find a most recent common ancestor within a drainage before finding an ancestor between drainages. This supports the hypothesis of allopatric divergence followed by later burst of speciation within a drainage. Our estimated divergence times for the Atlantic-Gulf split agree with other studies estimating vicariance in fish species of the Atlantic and gulf coast.

Diatoms in the Early Valdai (Weichselian) sediments in Lake Ladoga basin

2019 ◽  
pp. 225-228
Author(s):  
Anna V. Ludikova
Keyword(s):  
Species Diversity ◽  
High Energy ◽  
Lake Ladoga ◽  
Diatom Assemblages ◽  
Marine Diatoms ◽  
Selective Preservation

The pioneer diatom study of the Early Weichselian (Valdai) sediments in Lake Ladoga basin was performed. The specifics of the diatom assemblages (co-occurrence of ecologically incompatible taxa, poor species diversity, low diatom concentration and selective preservation) suggest that during the Early Weichselian time intense erosion of previously deposited marine Eemian (Mikulino) sediments prevailed, which resulted in re-deposition of marine diatoms. The sedimentation took place in high-energy environments unfavorable for diatom accumulation and preservation.

Algae of the Sefunim Cave (Israel): species diversity affected by light, humidity and rock stresses

2009 ◽  
Vol 11 (2) ◽  
pp. 99-116 ◽  
Author(s):  
O. N. Vinogradova ◽  
Eviatar Nevo ◽  
Solomon P. Wasser
Keyword(s):  
Species Diversity
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