Marine seabed litter in Siberian Arctic: A first attempt to assess

2021 ◽  
Vol 172 ◽  
pp. 112836
Author(s):  
Alexandr N. Benzik ◽  
Alexei M. Orlov ◽  
Mikhail A. Novikov
Keyword(s):  
Biomolecules ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 419 ◽  
Author(s):  
Nadezhda N. Sushchik ◽  
Olesia N. Makhutova ◽  
Anastasia E. Rudchenko ◽  
Larisa A. Glushchenko ◽  
Svetlana P. Shulepina ◽  
...  

Long-chain omega-3 polyunsaturated fatty acids (LC-PUFA) essential for human nutrition are mostly obtained from wild-caught fish. To sustain the LC-PUFA supply from natural populations, one needs to know how environmental and intrinsic factors affect fish fatty acid (FA) profiles and contents. We studied seven Salmoniformes species from two arctic lakes. We aimed to estimate differences in the FA composition of total lipids and two major lipid classes, polar lipids (PL) and triacylglycerols (TAG), among the species and to evaluate LC-PUFA contents corresponding to PL and TAG in muscles. Fatty acid profiles of PL and TAG in all species were characterized by the prevalence of omega-3 LC-PUFA and C16-C18 monoenoic FA, respectively. Fish with similar feeding spectra were identified similarly in multivariate analyses of total lipids, TAG and PL, due to differences in levels of mostly the same FA. Thus, the suitability of both TAG and total lipids for the identification of the feeding spectra of fish was confirmed. All species had similar content of LC-PUFA esterified as PL, 1.9–3.5 mg g−1, while the content of the TAG form strongly varied, from 0.9 to 9.8 mg g−1. The LC-PUFA-rich fish species accumulated these valuable compounds predominately in the TAG form.


Science ◽  
2010 ◽  
Vol 329 (5996) ◽  
pp. 1146-1147 ◽  
Author(s):  
V. V. Petrenko ◽  
D. M. Etheridge ◽  
R. F. Weiss ◽  
E. J. Brook ◽  
H. Schaefer ◽  
...  
Keyword(s):  

2017 ◽  
Vol 460 (1) ◽  
pp. 263-283 ◽  
Author(s):  
Sergey S. Drachev ◽  
Sergey I. Shkarubo
Keyword(s):  

2016 ◽  
Vol 9 (6) ◽  
pp. 470-470 ◽  
Author(s):  
Igor Semiletov ◽  
Irina Pipko ◽  
Örjan Gustafsson ◽  
Leif G. Anderson ◽  
Valentin Sergienko ◽  
...  

2021 ◽  
Vol 55 (2) ◽  
pp. 487-494
Author(s):  
A. D. Potemkin ◽  
A. A. Vilnet ◽  
E. I. Troeva ◽  
K. A. Ermokhina

Gymnocolea borealis is reported for the first time for Asia from Russia based on the morphological and subsequent molecular-genetic comparison of rbcL cpDNA sequence of the specimen from the Gydansky Peninsula, West Siberian Arctic. An extended morphological description, generalizing the species characters throughout its range, and data on its variation, differentiation and ecology, and photomicrographs are provided. The occurrence of G. borealis growing as separate shoots among dense mire vegetation makes it easy to overlook. Presently known isolated records of G. borealis support its disjunctive circumpolar distribution.


Radiocarbon ◽  
2017 ◽  
Vol 60 (1) ◽  
pp. 239-260 ◽  
Author(s):  
Robert J Losey ◽  
Lacey S Fleming ◽  
Tatiana Nomokonova ◽  
Andrei V Gusev ◽  
Natalia V Fedorova ◽  
...  

AbstractUst’-Polui is one of the most extensively studied archaeological sites in the western Siberian Arctic. New radiocarbon (14C) dates for charcoal, faunal remains, bark, hide, and human bone from this site are presented. When modeled, the charcoal dates span from ~260 BC to 140 AD, overlapping with the dendrochronology dates from the site. These dates also overlap with the expected age of the site based on artefact typology. 14C dates on reindeer bone have a slightly younger modeled age range, from ~110 BC to 350 AD. In contrast, dates on the site’s numerous dog remains, and on human and fish bone, all predate these modeled age ranges by over 500 years, despite being from the same deposits. Several sets of paired dates demonstrate significant age differences. Bone dates with lower δ13C values tend to be over 500 years older than those with higher δ13C values. Stable isotope data for the humans, dogs, and other faunal remains are also presented. These data suggest the dogs and the humans were regularly consuming freshwater fish. The dogs were probably fed fish by their human counterparts. Overall, the dog and human dietary patterns at Ust’-Polui created 14C dates biased with major freshwater reservoir effects.


2018 ◽  
Vol 15 (15) ◽  
pp. 4777-4779
Author(s):  
Katy J. Sparrow ◽  
John D. Kessler

Abstract. In this comment, we outline two major concerns regarding some of the key data presented in this paper. Both of these concerns are associated with the natural abundance radiocarbon-methane (14C-CH4) data. First, no systematic methodology is presented, nor previous peer-reviewed publication referenced, for how these samples were collected, prepared, and ultimately analyzed for 14C-CH4. Not only are these procedural details missing, but the critical evaluation of them using gaseous and aqueous blanks and standards was omitted although these details are essential for any reader to evaluate the quality of data and subsequent interpretations. Second, due to the lack of methodological details, the source of the sporadic anthropogenic contamination cannot be determined and thus it is premature for the authors to suggest it was in the natural environment prior to sample collection. As the natural 14C-CH4 data are necessary for the authors' stated scientific objectives of understanding the origin of methane in the East Siberian Arctic Shelf, our comment serves to highlight that the study's objectives have not been met.


2018 ◽  
Author(s):  
Birgit Wild ◽  
Natalia Shakhova ◽  
Oleg Dudarev ◽  
Alexey Ruban ◽  
Denis Kosmach ◽  
...  

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