scholarly journals Neutral processes and reduced dispersal across Amazonian rivers may explain how rivers maintain species diversity after secondary contact

2022 ◽  
Author(s):  
Sergio Santorelli Junior ◽  
William E. Magnusson ◽  
Cláudia Pereira de Deus ◽  
Timothy H. Keitt
Keyword(s):  
Species Diversity ◽  
Secondary Contact ◽  
Neutral Processes

scholarly journals A genome-wide assessment of stages of elevational parapatry in Bornean passerine birds reveals no introgression: implications for processes and patterns of speciation

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3335 ◽  
Author(s):  
Robert G. Moyle ◽  
Joseph D. Manthey ◽  
Peter A. Hosner ◽  
Mustafa Rahman ◽  
Maklarin Lakim ◽  
...  
Keyword(s):  
Gene Flow ◽  
Species Diversity ◽  
Genetic Relationships ◽  
Elevational Gradient ◽  
Secondary Contact ◽  
Elevational Gradients ◽  
Reduced Representation ◽  
Allopatric Species ◽  
A Genome ◽  
Elevational Range

Topographically complex regions often contain the close juxtaposition of closely related species along elevational gradients. The evolutionary causes of these elevational replacements, and thus the origin and maintenance of a large portion of species diversity along elevational gradients, are usually unclear because ecological differentiation along a gradient or secondary contact following allopatric diversification can produce the same pattern. We used reduced representation genomic sequencing to assess genetic relationships and gene flow between three parapatric pairs of closely related songbird taxa (Arachnothera spiderhunters, Chloropsis leafbirds, and Enicurus forktails) along an elevational gradient in Borneo. Each taxon pair presents a different elevational range distribution across the island, yet results were uniform: little or no gene flow was detected in any pairwise comparisons. These results are congruent with an allopatric “species-pump” model for generation of species diversity and elevational parapatry of congeners on Borneo, rather than in situ generation of species by “ecological speciation” along an elevational gradient.

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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