scholarly journals NEOGENE-QUATERNARY DEPOSITS OF THE COASTAL ZONE OF SOUTH-WESTERN KAMCHATKA AS AN INTERMEDIATE RESERVOIR TO FORM COASTAL-MARINE PLACERS

Author(s):  
V.Ye. Kungurova ◽  
E.M. Gazzaeva
2021 ◽  
Vol 21 (3) ◽  
pp. 165-168
Author(s):  
Dmitry Karnaukhov ◽  
Maria Teplykh ◽  
Еkaterina Dolinskaya ◽  
Sofya Biritskaya ◽  
Yana Ermolaeva ◽  
...  

Abstract The role of light pollution in aquatic ecosystems functioning has increased in recent times. In addition, the effect of such pollution has mostly been studied in coastal marine ecosystems, leaving freshwater ecosystems much less studied. In the p resent work, we investigated the effect of light pollution on the coastal zone of the ancient Lake Baikal ecosystem. Both a laboratory experiment and field research were conducted. The results of the experiment showed the presence of statistically significant differences (р =0.009) between fish feeding on amphipods with and without daylight conditions, while there were no such differences between daylight and artificial light conditions. At the same time, video recordings revealed both a low number of specimens and a low species diversity of amphipods near to the village with a developed system of street lights, while in the village with a nearly nonexistent light system, the species diversity and a number of amphipods were much higher. One plausible explanation for such influence of light pollution on the quality and quantity of Baikal amphipod fauna might be the sum of several factors such as high water transparency and daily vertical migrations of amphipods.


Viruses ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 806
Author(s):  
Anastasia Tsiola ◽  
Grégoire Michoud ◽  
Stilianos Fodelianakis ◽  
Ioannis Karakassis ◽  
Georgios Kotoulas ◽  
...  

Viruses interfere with their host’s metabolism through the expression of auxiliary metabolic genes (AMGs) that, until now, are mostly studied under large physicochemical gradients. Here, we focus on coastal marine ecosystems and we sequence the viral metagenome (virome) of samples with discrete levels of human-driven disturbances. We aim to describe the relevance of viromics with respect to ecological quality status, defined by the classic seawater trophic index (TRIX). Neither viral (family level) nor bacterial (family level, based on 16S rRNA sequencing) community structure correlated with TRIX. AMGs involved in the Calvin and tricarboxylic acid cycles were found at stations with poor ecological quality, supporting viral lysis by modifying the host’s energy supply. AMGs involved in “non-traditional” energy-production pathways (3HP, sulfur oxidation) were found irrespective of ecological quality, highlighting the importance of recognizing the prevalent metabolic paths and their intermediate byproducts. Various AMGs explained the variability between stations with poor vs. good ecological quality. Our study confirms the pivotal role of the virome content in ecosystem functioning, acting as a “pool” of available functions that may be transferred to the hosts. Further, it suggests that AMGs could be used as an ultra-sensitive metric of energy-production pathways with relevance in the vulnerable coastal zone and its ecological quality.


Author(s):  
Norbert P. Psuty ◽  
Philip E. Steinberg

The 1990s witnessed a significant increase in popular interest in the US regarding the geography of the world’s coastal and marine spaces. Factors motivating this renewed interest included growing public environmental awareness, a decade of unusually severe coastal storms, more frequent reporting of marine pollution hazards, greater knowledge about (and technology for) depleting fishstocks, domestic legislation on coastal zone management and offshore fisheries policies, new opportunities for marine mineral extraction, heightened understanding of the role of marine life in maintaining the global ecosystem, new techniques for undertaking marine exploration, the 1994 activation of the United Nations Convention on the Law of the Sea, reauthorization of the US Coastal Zone Management Act in 1996, and designation of 1998 as the International Year of the Ocean. Responding to this situation, the breadth of perspectives from which coastal and marine issues are being encountered by geographers, the range of subjects investigated, and the number of geographers engaging in coastal-marine research have all increased during the 1990s. As West (1989a) reported in the original Geography in America, North American coastal-marine geography during the 1980s was focused toward fields such as coastal geomorphology, ports and shipping, coastal zone management, and tourism and recreation. Research in these areas has continued, but in the 1990s, with increased awareness of the importance of coastal and marine areas to physical and human systems, geographers from a range of subdisciplines beyond those usually associated with coastal-marine geography have begun turning to coastal and marine areas as fruitful sites for conducting their research. Climatologists are investigating the sea in order to understand processes such as El Niño, remote-sensing experts are studying how sonic imagery can be used for understanding species distribution in three-dimensional environments, political ecologists are investigating the ocean as a common property resource in which multiple users’ agendas portend conflict and cooperation, and cultural geographers are examining how the ocean is constructed as a distinct space with its own social meanings and “seascapes.” Despite (or perhaps because of ) this expansion in coastal-marine geography, the subdiscipline remains fragmented into what we here call “Coastal Physical Geography,” “Marine Physical Geography,” and “Coastal-Marine Human Geography.”


Author(s):  
P. S. Sorokin ◽  

The existing approaches and regulations for the determination of the marine boundaries of the part of coastal-marine natural management are analyzed. There are no uniform boundaries in the direction toward the sea, despite the presence of numerous definitions of the coastal zone. For the purposes of maritime activities management, i.e. coastal and oceanic natural management, the geomorphological definition of the coastal zone becomes insufficient due to the greater dependence on the land space. Therefore, it is proposed to use the term "coastal-marine zone" with a broader definition, including, in addition to territorial, coastal and aquatic structures. The coastal-sea zone boundaries can be established depending on the research objectives. In our research, we suggest to establish this kind of depth boundary, considering it a limiting factor of marine economic activities.


Author(s):  
Yonglong Lu ◽  
Jingjing Yuan ◽  
Xiaotian Lu ◽  
Chao Su ◽  
Yueqing Zhang ◽  
...  

<p>Coastal zone is of great importance in the provision of various valuable ecosystem services. However, it is also sensitive and vulnerable to environmental changes due to high human populations and interactions between the land and ocean. Major threats of pollution from over enrichment of nutrients, increasing metals and persistent organic pollutants (POPs), and climate change have led to severe ecological degradation in the coastal zone, while few studies have focused on the combined impacts of pollution and climate change on the coastal ecosystems at the global level. A global overview of nutrients, metals, POPs, and major environmental changes due to climate change and their impacts on coastal ecosystems was carried out in this study. Coasts of the Eastern Atlantic and Western Pacific were hotspots of concentrations of several pollutants, and mostly affected by warming climate. These hotspots shared the same features of large populations, heavy industry and (semi-) closed sea. Estimation of coastal ocean capital, integrated management of land-ocean interaction in the coastal zone, enhancement of integrated global observation system, and coastal ecosystem-based management can play effective roles in promoting sustainable management of coastal marine ecosystems. Enhanced management from the perspective of mitigating pollution and climate change was proposed.</p>


Algologia ◽  
2021 ◽  
Vol 31 (3) ◽  
pp. 249-270
Author(s):  
S.Yu. Sadogurskiy ◽  
◽  
S.O. Sadogurska ◽  
T.V. Belich ◽  

The data on the composition and distribution of macrophytobenthos of marine and lagoon water areas of the Black Sea coastal zone in the west of the Tarkhankut Peninsula in the summer season are presented. It is shown that the occurrence and general characteristics of the vegetation cover are determined by the type of substrate. In the sea (where hydrological conditions are relatively homogeneous), the ratio of ecological-floristic groups and the species composition change with distance from the coast and along with it, depending on the depth and geomorphological features of coastal zone fragments. In the lagoon, the ratio of such groups changes along the complex gradient of environmental factors, formed by the groundwater runoff of fresh and marine waters. Within the surveyed area, 91 species of macrophytes were registered: Tracheophyta – 1 species (1.1%), Chlorophyta – 23 (25.3%), Ochrophyta (Phaeophyceae) – 21 (23.1%), and Rhodophyta – 46 (50.5%). Of these, 87 species were recorded in the sea (including 44 in the pseudolittoral zone and 81 – in the sublittoral zone). The macrophytobenthos has a pronounced marine oligosaprobic character. Short-vegetation Rhodophyta dominate by the number of species, and perennial Phaeophyceae dominate by biomass, reaching 1 kg∙m-2 in the pseudolittoral and almost 7 kg∙m-2 in the sublittoral. In the lagoon, 18 species of macrophytes were registered (4 exclusively in the lagoon). Mesosaprobic short-vegetation Rhodophyta dominate by the number of species; marine and brackish-water macrophytes are equally represented. Polysaprobic perennial Tracheophyta, which belong to the marine group, dominate by biomass, which is ranging from 0.04 to 1.2 kg∙m-2. It was found that at the time of the research, the macrophytobenthos of the surveyed area was characterized by high productivity, high species, and coenotic diversity. There were taxa and biotopes, which are subject to special protection under regional and international programs. In general, the nature of the vegetation, the composition of the flora and the ratio of the main ecological-floristic indicators corresponded to those indicated for the Tarkhankut-Sevastopol hydrobotanical region of the Black Sea. Considering the sozological value, the aquatic component of the territorial-aquatic complex was recommended for conservation and inclusion in the ecological networks (incl. the Emerald Network). The increased anthropogenic pressure and the threat of the coastal zone transformation actualize the problem of its conservation as one of the key reserves of the floristic and biotopic diversity of coastal-marine areas in the Northern Black Sea region.


2001 ◽  
Vol 55 (2) ◽  
pp. 246-254 ◽  
Author(s):  
Sergio Martı́nez ◽  
Martı́n Ubilla ◽  
Mariano Verde ◽  
Daniel Perea ◽  
Alejandra Rojas ◽  
...  

AbstractMinimum radiocarbon ages of marine Pleistocene molluscs from Uruguay range from 29,500±600 to 35,500±1900 14C yr B.P. Because knowledge of the marine Quaternary stratigraphy of Uruguay remains inadequate, no attempt is made to correlate between these deposits and recognized lithostratigraphic units. Analysis of the temperature and salinity ranges of the various molluscs suggests the establishment of a poly-euhaline fauna that inhabited waters warmer than present at the same latitude. This is supported by a northward retreat in the recent distribution of Chrysallida cf. C. gemmulosa, Nioche subrostrata, and probably Anomalocardia brasiliana. These marine Pleistocene deposits can probably be correlated with the last interglaciation (oxygen-isotopic substage 5e). At that time the fluvial-marine front of the Rio de la Plata was displaced much further northwestward than previously supposed. Chrysallida cf. C. gemmulosa and Limaria sp. are recorded in Uruguayan Quaternary deposits for the first time.


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