scholarly journals Species diversity, functional complexity and rarity in Arctic fjordic versus open shelf benthic systems

2012 ◽  
Vol 463 ◽  
pp. 73-87 ◽  
Author(s):  
M Włodarska-Kowalczuk ◽  
PE Renaud ◽  
JM Węsławski ◽  
SKJ Cochrane ◽  
SG Denisenko
Keyword(s):  
Species Diversity ◽  
Functional Complexity ◽  
Open Shelf ◽  
Benthic Systems

scholarly journals Late Permian (Changsingian) ostracods of the Bellerophon Formation at Seis (Siusi) (Dolomites, Italy)

2012 ◽  
Vol 31 (1) ◽  
pp. 73-87 ◽  
Author(s):  
Wolfgang Mette ◽  
Parvaneh Roozbahani
Keyword(s):  
Species Diversity ◽  
Environmental Conditions ◽  
Upper Permian ◽  
Early Triassic ◽  
Late Permian ◽  
South Tyrol ◽  
Strong Affinity ◽  
Open Shelf

Abstract. Ostracod assemblages of the Upper Permian Bellerophon Formation at Seis near Bozen (South Tyrol, Italy) have been studied with respect to their taxonomy and palaeoecology. The investigations were concentrated on the Late Changsingian Casera Razzo Member which yielded five ostracod assemblages including more than twenty-four species. Twelve of these species are described herein and four species are new, including two species with strong affinity to taxa appearing in the Early Triassic. The lithofacies characteristics and low species diversity are suggestive of a protected shallow lagoonal environment with salinity fluctuations due to freshwater influx. Only four species are recorded from Late Permian localities outside of the Dolomites. This is due to the restricted environmental conditions which inhibited the immigration of more taxa from open shelf environments.

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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