scholarly journals Two new nematode species of the genus Tobrilus Andrássy, 1959 (Nematoda, Triplonchida) from Lake Baikal, Russia

2019 ◽  
Author(s):  
Tatyana V. Naumova ◽  
Vladimir G. Gagarin
Keyword(s):  
Body Size ◽  
Lake Baikal ◽  
Littoral Zone ◽  
Nematode Species ◽  
The Body ◽  
Male Tail ◽  
Lubomirskia Baicalensis

Two new nematode species of the genus Tobrilus Andrássy, 1959 from Lake Baikal are described and illustrated. The first species Tobrilus elginus sp. nov. was found in the littoral zone of Maloye More Bays. The second species Tobrilus juliae sp. nov. dwells on bodies of dead sponges Lubomirskia baicalensis (Pallas, 1776). Tobrilus elginus sp. nov. is most similar to T. amabilis Tsalolikhin, 1974 and T. bekmanae Tsalolikhin, 1975. In contrast to the first species it has a shorter body and spicules, longer gubernaculum and a shorter supplements row. Its body is shorter and thinner, tail and supplement row are shorter and the vulva is more posterior as compared to the second species. The body size of Tobrilus juliae sp. nov. is most similar to T. securus Gagarin & Naumova, 2011 and T. saprophagus Naumova & Gagarin, 2017. From the first of these species it differs by the thinner body, shorter tail, comparatively shorter outer labial setae and shorter spicules. It differs from the second species by a thinner body, shorter male tail and shorter labial setae.

scholarly journals Two new nematode species of the genus Paratrilobus Micoletzky, 1922 (Nematoda, Triplonchida) from the water area of Lake Baikal (Russia)

2020 ◽  
Vol 723 ◽  
pp. 159-172
Author(s):  
Tatyana V. Naumova ◽  
Vladimir G. Gagarin
Keyword(s):  
New Species ◽  
Body Size ◽  
River Water ◽  
Lake Baikal ◽  
Nematode Species ◽  
Water Area ◽  
The Body ◽  
Thin Body ◽  
Diagnostic Features ◽  
Railway Station

This paper describes and illustrates two new nematode species of the genus Paratrilobus Micoletzky, 1922. The species Paratrilobus tankhoyensis sp. nov. was found at the estuary of the Pereyomnaya River (water area of Lake Baikal, near the Tankhoy railway station). Paratrilobus tankhoyensis sp. nov. is most similar to P. expugnator (Tsalolichin, 1976) in the body size, but differs in the comparatively thin body, shorter and thicker tail, shorter stoma and spicules. Another new species, Paratrilobus aquaticus sp. nov., was found in Posolsk Bank (natural underwater elevation of the bottom between the southern and central basins of Lake Baikal). The species is similar to P. granulosus Gagarin & Naumova, 2011 and P. ultimus (Tsalolichin, 1977) in the structure of the precloacal supplements. It differs from the former in the absence of crystalloids, a comparatively longer pharynx, longer stoma and outer labial setae as well as the absence of subterminal seta. It differs from the latter in a longer pharynx, stoma and longer outer labial setae as well as a longer and more slender tail. We also discuss diagnostic features of the males of the genus Paratrilobus.

Two nematode species of the family Tobrilidae (Enoplida) De Coninck, 1965 from Lake Baikal, Russia

Zootaxa ◽  
2011 ◽  
Vol 2815 (1) ◽  
Author(s):  
VLADIMIR G. GAGARIN ◽  
TATYANA V. NAUMOVA
Keyword(s):  
New Species ◽  
Body Size ◽  
Lake Baikal ◽  
Nematode Species ◽  
The Family ◽  
Anterior Position

Two nematode species found in Lake Baikal, Gorevoi Utes (Russia) are presented. Eutobrilus mirandus sp. n. differs from all other species of the genus Eutobrilus by the markedly anterior position of the vulva (V=26–31%). The new species is similar to E. andrassyi Altherr, 1963 in body size and stoma structure but differs in the comparatively thicker body (males, a = 32–45 versus a = 60–75), shorter stoma (males, 26–27 µm long versus 35–40 µm long), longer spicules (48–53 µm versus 40 µm), and absence of crystalloids. A redescription and new illustrations of Paratrilobus delicatus (Shoshin, 1988) Andrássy, 2007, including a description of the previously unknown females, are also given.

Two nematode species of the family Tobrilidae (Enoplida) De Coninck, 1965 from Lake Baikal, Russia

Zootaxa ◽  
2011 ◽  
Vol 2815 (1) ◽  
pp. 59 ◽  
Author(s):  
VLADIMIR G. GAGARIN ◽  
TATYANA V. NAUMOVA
Keyword(s):  
New Species ◽  
Body Size ◽  
Lake Baikal ◽  
Nematode Species ◽  
The Family ◽  
Anterior Position

Two nematode species found in Lake Baikal, Gorevoi Utes (Russia) are presented. Eutobrilus mirandus sp. n. differs from all other species of the genus Eutobrilus by the markedly anterior position of the vulva (V=26–31%). The new species is similar to E. andrassyi Altherr, 1963 in body size and stoma structure but differs in the comparatively thicker body (males, a = 32–45 versus a = 60–75), shorter stoma (males, 26–27 µm long versus 35–40 µm long), longer spicules (48–53 µm versus 40 µm), and absence of crystalloids. A redescription and new illustrations of Paratrilobus delicatus (Shoshin, 1988) Andrássy, 2007, including a description of the previously unknown females, are also given.

scholarly journals Trophic position and diet shift based on the body size of Coreoperca kawamebari (Temminck & Schlegel, 1843)

2020 ◽  
Vol 44 (1) ◽  
Author(s):  
Jong-Yun Choi ◽  
Seong-Ki Kim ◽  
Jeong-Cheol Kim ◽  
Jung-Do Yoon
Keyword(s):  
Body Size ◽  
Trophic Interactions ◽  
Littoral Zone ◽  
Trophic Position ◽  
Juvenile Fish ◽  
Isotope Analysis ◽  
Central Zone ◽  
The Body ◽  
Diet Shift ◽  
The Relationship

Abstract Background Fish body size is a major determinant of freshwater trophic interactions, yet only a few studies have explored the relationship between the fish body size and trophic interactions in river upstream. In this study, we investigated the relationship between the body size and trophic position (TP) of Coreoperca kawamebari (Temminck & Schlegel, 1843) in an upstream of the Geum River. Results A stable isotope analysis (based on δ15N) was used to determine the TP based on the body size of C. kawamebari. The regression analysis (n = 33, f = 63.840, r2 = 0.68) clearly showed the relationship between the body length and TP of C. kawamebari. The TP of C. kawamebari was clearly divided by body size into the following classes: individuals of size < 10 cm that feed on insects and individuals of size > 10 cm feed on juvenile fish. This selective feeding is an evolutionarily selective tendency to maximize energy intake per unit time. Furthermore, the diet shift of C. kawamebari was led by different spatial distributions. The littoral zone was occupied by individuals of size < 10 cm, and those of size > 10 cm were mainly in the central zone. The littoral zone can be assumed to be enriched with food items such as ephemeropterans and dipterans. Conclusion The TP of C. kawamebari, as a carnivorous predator, will have a strong influence on biotic interactions in the upstream area of the Geum River, which can lead to food web implication.

Structural Changes in Phytoplankton of the Littoral Zone of Lake Baikal

2017 ◽  
Vol 53 (2) ◽  
pp. 16-24 ◽  
Author(s):  
N. A. Bondarenko ◽  
N. F. Logacheva
Keyword(s):  
Lake Baikal ◽  
Littoral Zone ◽  
Structural Changes

Prevailing Species of Bacillariophyta of the Littoral Zone of Lake Baikal (Russia)

2011 ◽  
Vol 13 (2) ◽  
pp. 101-116 ◽  
Author(s):  
T. A. Sherbakova ◽  
G. V. Pomazkina
Keyword(s):  
Lake Baikal ◽  
Littoral Zone

The Body Size of Headstarted and Wild Juvenile European Pond Turtles (Emys orbicularis)

2017 ◽  
Vol 25 (2) ◽  
pp. 161
Author(s):  
Sławomir Mitrus ◽  
Bartłomiej Najbar ◽  
Adam Kotowicz ◽  
Anna Najbar
Keyword(s):  
Body Size ◽  
The Body ◽  
Emys Orbicularis

Composition, biomass, and photosynthetic activity of the benthic algal communities in a littoral zone of Lake Baikal in summer

Limnology ◽  
2002 ◽  
Vol 3 (3) ◽  
pp. 175-180 ◽  
Author(s):  
K. Nozaki ◽  
H. Morino ◽  
H. Munehara ◽  
V. G. Sideleva ◽  
K. Nakai ◽  
...  
Keyword(s):  
Lake Baikal ◽  
Littoral Zone ◽  
Photosynthetic Activity ◽  
Algal Communities

scholarly journals First record of Pachycrocuta brevirostris (Gervais, 1850) from Ukraine on the background of the European occurrence of the species

2021 ◽  
Author(s):  
Adrian Marciszak ◽  
Yuriy Semenov ◽  
Piotr Portnicki ◽  
Tamara Derkach
Keyword(s):  
Body Size ◽  
First Record ◽  
The Body ◽  
Crocuta Crocuta ◽  
Early Pleistocene ◽  
Eastern Asia ◽  
South Eastern

AbstractCranial material ofPachycrocuta brevirostrisfrom the late Early Pleistocene site of Nogaisk is the first record of this species in Ukraine. This large hyena was a representative of the Tamanian faunal complex and a single specialised scavenger in these faunas. The revisited European records list ofP.brevirostrisdocumented the presence of this species in 101 sites, dated in the range of 3.5–0.4 Ma. This species first disappeared in Africa, survived in Europe until ca. 0.8–0.7 Ma, and its last, relict occurrence was known from south-eastern Asia. The main reason of extinction ofP.brevirostrisprobably was the competition withCrocuta crocuta. The cave hyena was smaller, but its teeth were proportionally larger to the body size, better adapted to crushing bones and slicing meat, and could also hunt united in larger groups.

scholarly journals Insect body size changes under future warming projections: a case study of Chironomidae (Insecta: Diptera)

Hydrobiologia ◽  
2021 ◽  
Author(s):  
Rungtip Wonglersak ◽  
Phillip B. Fenberg ◽  
Peter G. Langdon ◽  
Stephen J. Brooks ◽  
Benjamin W. Price
Keyword(s):  
Body Size ◽  
Ambient Temperature ◽  
Wing Length ◽  
The Body ◽  
Mesocosm Experiments ◽  
Future Warming ◽  
Increasing Temperature ◽  
Emergence Date ◽  
Average Body

AbstractChironomids are a useful group for investigating body size responses to warming due to their high local abundance and sensitivity to environmental change. We collected specimens of six species of chironomids every 2 weeks over a 2-year period (2017–2018) from mesocosm experiments using five ponds at ambient temperature and five ponds at 4°C higher than ambient temperature. We investigated (1) wing length responses to temperature within species and between sexes using a regression analysis, (2) interspecific body size responses to test whether the body size of species influences sensitivity to warming, and (3) the correlation between emergence date and wing length. We found a significantly shorter wing length with increasing temperature in both sexes of Procladius crassinervis and Tanytarsus nemorosus, in males of Polypedilum sordens, but no significant relationship in the other three species studied. The average body size of a species affects the magnitude of the temperature-size responses in both sexes, with larger species shrinking disproportionately more with increasing temperature. There was a significant decline in wing length with emergence date across most species studied (excluding Polypedilum nubeculosum and P. sordens), indicating that individuals emerging later in the season tend to be smaller.

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