Expended range of Gomphonema firmum (Bacillariophyceae), once considered a Lake Baikal endemic, with notes on the identity of G. lanceolatum var. maximum

Phytotaxa ◽  
2022 ◽  
Vol 530 (2) ◽  
pp. 213-220
Author(s):  
VASILY S. VISHNYAKOV
Keyword(s):  
Lake Baikal ◽  
Species Distribution ◽  
Current Distribution ◽  
Deep Water ◽  
New Record ◽  
High Abundance ◽  
Small Stream ◽  
Southern Siberia ◽  
Size Diminution ◽  
Lake Teletskoe

This note describes a new record of Gomphonema firmum Skvortzow, which expanded both morphological and distributional ranges of the species. This conspicuous diatom was previously unknown outside of Lake Baikal, where it inhabits deep-water areas. The newly discovered locality belongs to a small stream at a distance of 180 km west from Lake Baikal, where the species was found in a relatively high abundance that enabled to trace a size diminution series including specimens shorter than previously described. In addition, G. lanceolatum var. maximum Poretzky, a name for a diatom from Lake Teletskoe, was included in a synonymy of G. firmum that further expanded the species distribution. In the light of the presented data, the species appears to be a rare diatom with current distribution limited to a few scattered localities in southern Siberia.

Vegetation of sandy coasts of Lake Baikal

2016 ◽  
pp. 46-66
Author(s):  
Тю Фю Dulepova
Keyword(s):  
Lake Baikal ◽  
Lake Basin ◽  
Floristic Diversity ◽  
Southern Siberia ◽  
Irkutsk Region ◽  
Relief Formation ◽  
The Republic ◽  
River Valleys ◽  
High Degree ◽  
Semiarid Conditions

The aeolian processes play an important role in the relief formation under the semiarid conditions of the intermountain basins of Southern Siberia. Ancient sand landforms occur in different regions of Siberia — the Ob, Chuya, Аley, Yenisei, Аngara, Selenga, Chikoy, Khilok and Chara river valleys and Lake Baikal coasts. The sandy coasts of Lake Baikal are of great interest in terms of floristic diversity determined by a high degree of endemism. Despite centuries of study of the lake basin, sand vegetation is poorly described in the literature. This study presents an analysis of 184 relevés of psammophytic vegetation from the Republic of Buryatia (Severobaikalsky, Barguzinsky, Pribaikalsky districts) and Irkutsk region (Olkhon Island) obtained in 2009–2014.

New record of the deep water Epimeria morronei Winfield, Ortiz & Hendrickx (Amphipoda, Gammaridea, Epimeriidae) in the east Pacific

Crustaceana ◽  
2014 ◽  
Vol 87 (14) ◽  
pp. 1699-1703
Author(s):  
Michel E. Hendrickx ◽  
Ignacio Winfield ◽  
Manolo Ortiz
Keyword(s):  
Deep Water ◽  
Environmental Conditions ◽  
New Record ◽  
New Records ◽  
Eastern Pacific ◽  
Depth Range ◽  
East Pacific

New records for the deep-water amphipod Epimeria morronei Winfield, Ortiz & Hendrickx, 2012, are presented for the eastern Pacific. Also, new data related to its depth range and environmental conditions are given.

scholarly journals Trans-marine dispersal inferred from the saltwater tolerance of lizards from Taiwan

PLoS ONE ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. e0247009
Author(s):  
Min-Hao Hsu ◽  
Jhan-Wei Lin ◽  
Chen-Pan Liao ◽  
Jung-Ya Hsu ◽  
Wen-San Huang
Keyword(s):  
Species Distribution ◽  
Current Distribution ◽  
Water Loss ◽  
Physiological Responses ◽  
Lizard Species ◽  
Terrestrial Vertebrates ◽  
Marine Dispersal ◽  
Historical Geology ◽  
Saltwater Tolerance ◽  
Hemidactylus Frenatus

Dehydration and hypersalinity challenge non-marine organisms crossing the ocean. The rate of water loss and saltwater tolerance thus determine the ability to disperse over sea and further influence species distribution. Surprisingly, this association between physiology and ecology is rarely investigated in terrestrial vertebrates. Here we conducted immersion experiments to individuals and eggs of six lizard species differently distributed across Taiwan and the adjacent islands to understand if the physiological responses reflect the geographical distribution. We found that Plestiodon elegans had the highest rate of water loss and the lowest saltwater tolerance, whereas Eutropis longicaudata and E. multifasciata showed the lowest rate of water loss and the highest saltwater tolerance. Diploderma swinhonis, Hemidactylus frenatus, and Anolis sagrei had medium measurements. For the eggs, only the rigid-shelled eggs of H. frenatus were incubated successfully after treatments. While, the parchment-shelled eggs of E. longicaudata and D. swinhonis lost or gained water dramatically in the immersions without any successful incubation. Combined with the historical geology of the islands and the origin areas of each species, the inferences of the results largely explain the current distribution of these lizards across Taiwan and the adjacent islands, pioneerly showing the association between physiological capability and species distribution.

Comparative analysis of the fatty acid composition of deep-water Baikal amphipods

Crustaceana ◽  
2019 ◽  
Vol 92 (1) ◽  
pp. 57-72
Author(s):  
Selmeg V. Bazarsadueva ◽  
Larisa D. Radnaeva ◽  
Arnold K. Tulokhonov
Keyword(s):  
Fatty Acids ◽  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Lake Baikal ◽  
Deep Water ◽  
Monounsaturated Fatty Acids ◽  
Manned Submersible ◽  
Main Fatty Acid ◽  
Low Levels

Abstract In this report, we have compared the fatty acid composition of the endemic Lake Baikal amphipods Ommatogammarus albinus (Dybowsky, 1874) and Parapallasea lagowskii (Dybowsky, 1874). Specimens were sampled using the deep-water manned submersible “Mir” at the oil-methane seeps of Cape Gorevoy Utes and at a hydrothermal vent in Frolikha Bay. High levels of monounsaturated fatty acids and relatively low levels of saturated and polyunsaturated fatty acids were detected in the studied amphipods, with oleic and palmitic acid representing the main fatty acid components. The habitat of the amphipods exerted a profound effect on their fatty acid profile: the amphipods of Gorevoy Utes contained higher levels of linolenic 18:3n3 and arachidonic 20:4n6 acids, while the amphipods of Frolikha Bay contained higher levels of eicosapentaenoic 20:5n3 and docosahexaenoic 22:6n3 acid. Based on these findings, we suggest that the amphipods’ diet in different areas of Lake Baikal determines their fatty acid composition.

Hydaticus aequalis sp. n. and a new record of H. devexus Trémouilles, 1996 from Brazil (Coleoptera, Dytiscidae, Hydaticini)

Zootaxa ◽  
2020 ◽  
Vol 4820 (2) ◽  
pp. 379-384
Author(s):  
CESAR J. BENETTI ◽  
GREY T. GUSTAFSON ◽  
NEUSA HAMADA ◽  
ANDREW EDWARD Z. SHORT
Keyword(s):  
New Species ◽  
New Record ◽  
Dorsal Surface ◽  
Northeastern Brazil ◽  
Amazon Forest ◽  
Single Specimen ◽  
Distribution Map ◽  
Small Stream ◽  
Medial Lobe ◽  
Neotropical Species

Hydaticus aequalis sp. n. is described from Brazil, where it was recently discovered in the central lowlands region of the Amazon forest. The new species differs from all other Neotropical congeners by its uniformly brown dorsal surface and the shape of medial lobe. The dorsal habitus and male genitalia are illustrated, and a distribution map is provided. The habitat, a small stream and associated forest pool, is illustrated and described. In addition, a new record of H. devexus Trémouilles, 1996, previously known from a single specimen, is reported from the highlands of northeastern Brazil, and a modified key to Neotropical species of the genus is provided.

Relationship between salinity and the 3H-3He age in deep water of Lake Baikal

2006 ◽  
Vol 408 (1) ◽  
pp. 645-648
Author(s):  
M. N. Shimaraev ◽  
R. Yu. Gnatovskii ◽  
V. V. Blinov ◽  
A. A. Zhdanov
Keyword(s):  
Lake Baikal ◽  
Deep Water

Deep-water renewal and biological production in Lake Baikal

Nature ◽  
1991 ◽  
Vol 349 (6311) ◽  
pp. 665-669 ◽  
Author(s):  
R. F. Weiss ◽  
E. C. Carmack Carmack ◽  
V. M. Koropalov
Keyword(s):  
Lake Baikal ◽  
Deep Water ◽  
Biological Production ◽  
Water Renewal

Endemic Lake Baikal sponges from deep water. 2: Taxonomy and Bathymetric Distribution

Zootaxa ◽  
2017 ◽  
Vol 4236 (2) ◽  
pp. 335 ◽  
Author(s):  
VALERIA B. ITSKOVICH ◽  
OXANA V. KALUZHNAYA ◽  
ELENA VEYNBERG ◽  
DIRK ERPENBECK
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Deep Water ◽  
Great Depth ◽  
Limiting Factor ◽  
Bathymetric Distribution ◽  
Morphological Studies ◽  
Lubomirskia Baicalensis ◽  
The Family ◽  
Baikalospongia Intermedia

Unique samples of deep-water sponges of Lake Baikal were collected between 120 and 1450 m depth and their taxonomy and bathymetric distribution were studied. Based on morphological studies with scanning electron microscopy (SEM) and molecular analyses (CO1, ITS) we describe a new species, Baikalospongia abyssalis sp. nov. Spicule morphology of this new species is similar to Palaeoephydatia sp., a species previously known only from fossils in Late Pliocene (3.2−2.8 mya) sediments. Other sponge samples collected were identified as Baikalospongia intermedia intermedia, B. intermedia profundalis, B. bacillifera, B. fungiformis, B. martinsoni and Swartschewskia papyracea, all from the family Lubomirskiidae. Sponge specimens with giant spicules, identified as B. fungiformis, were found at great depths. B.i. intermedia and B. i. profundalis are dominating species at great depth. Light is a limiting factor for distribution of Lubomirskia baicalensis, possibly due to its symbiosis with photosynthetic protists. The current study extends our knowledge on the distribution boundaries of Lubomirskiidae at great depths. 

Sign in / Sign up

Export Citation Format

Share Document