CONTROL OF POTENTIAL MUSSEL RECRUITMENT TAKING INTO ACCOUNT SOME ENVIRONMENTAL PARAMETERS IN SEVASTOPOL ESTUARINE ZONE

In 2020-2021, potential recruitment of the mussel Mytilus galloprovincialis was measured in Sevastopol estuarine waters with regard to temperature, salinity, and pH in three depth horizons 1–3, 7, and 11 m. Compared to the previous annual period in 2021, spring mussel recruitment at all depth horizons in-creased by an order of magnitude. This increase was preceded by a mild winter. Also in 2021, a decrease in salinity and an increase in the vertical variability of the thermohaline structure of water were observed. The obtained data may indirectly indicate the improvement of environmental conditions for mussel productivity increase in 2021. The necessity of improving the method of the control for mussel recruit-ment related to possible vertical migrations of its post-larvae is shown.

Isopod Parasite, Nerocila Depressa (Edwards, 1840) Infestation in Thryssa Stenosoma (Wongratana, 1983) as New Host, and First Record from Narmada Estuary, West Coast of India

The study reported Thryssa stenosoma, as new host for isopod Nerocila depressa, infestation. Furthermore, the report is of first to record Nerocila depressa from the Narmada, the largest estuary of west coast of India. Thryssa stenosoma forms a commercially important fish species at Bhadbhut, a part of the Narmada estuary. The prevalence of isopod infestation was 17.39% with mean intensity 2.8 in T. stenosoma, indicating the low, at the present ecological conditions. Looking at the future proposed developmental river valley projects at Bhadbhut estuarine zone, our present information would form baseline to the parasitic diseases in estuarine fishes in Narmada estuary, India.

CHANGES IN THE VANADIUM MIGRATION FORMS ON GEOCHEMICAL BARRIERS IN THE RIVER-SEA MIXING ZONES

The article is devoted to the study of vanadium, a metal capable of stimulating the growth of phytoplankton in situ and has the greatest biological activity in dissolved form. The pattern of an increase in the concentration of vanadium dissolved forms in the mixing zones during the transition from river waters to seawaters is known. In this article, we examine the behavior, ratio and change in the concentrations of vanadium dissolved and suspended forms during the passage of geochemical barriers. The estuarine zone of the Razdolnaya River–Amur Bay (Sea of Japan) is considered as "river-sea" mixing zone. Modelling of physicochemical processes was carried out using the Selector-S and MINTEQA2/PRODEFA2 software systems. Ion-associative models of sea and river water were built and the modelling of the process of their mixing was carried out using the Selector-S software package. The sorption process was simulated using the MINTEQA2/PRODEFA2 software package. The results of modelling physicochemical processes occurring at geochemical barriers help to understand the reasons for changes in concentrations, both total vanadium and biologically active dissolved vanadium forms, during the passage of geochemical barriers in the "river-sea" mixing zones. The results showed that there is a change in the dissolved forms of vanadium migration, their transformation and an increase in the concentration of dissolved forms of vanadium at the geochemical barrier

Fatores de Antropização no Isolamento e Distanciamento Sociais durante a Pandemia DE COVID-19: estudo de caso em cidade local da amazônia estuarina

RESUMOConsiderando a pandemia atual, este artigo aborda fatores de antropização que auxiliem indicadores de distanciamento social considerando realidades próprias da região amazônica. Foi conduzida a aplicação de formulário com moradores da cidade de São Caetano de Odivelas - Pará, localizada na zona estuarina do rio Amazonas, quanto à concordância, discordância ou indiferença por decorrência de determinações governamentais e de saúde pública. Observou-se que há dificuldade em relacionar demandas locais com as nacionais e globais, acarretando em comportamentos que podem comprometer a eficiência do isolamento social, assim, são propostos indicadores para distanciamento social.Palavras-chave: Indicadores. Coronavírus. Antropização. Isolamento Social. Distanciamento Social. Cidade Local.Anthropization factors in social isolation and distancing during the Covid-19 Pandemic: case study in a local city of estuarian amazon ABSTRACTConsidering the current pandemic, this article addresses anthropization factors that help social distancing indicators focused on realities specific to the Amazon region. A form was applied to residents of the city of São Caetano de Odivelas - Pará, located in the estuarine zone of the Amazon River, regarding agreement, disagreement or indifference due to government and public health determinations. It was observed that there is difficulty in relating local demands with national and global ones, resulting in behaviors that can compromise the efficiency of social isolation, thus, indicators for social distance are proposed.Keywords: Indicators. Coronavirus. Anthropization, Social Isolation. Social Distancing. Local City.

Dynamics of phytoplankton groups in estuarine area of Oued River (Mazafran, Algeria)

Estuaries are the contact areas between fresh and sea waters. These areas are very unstable ecosystems, and the hydrological. physicochemical parameters are extremely variable. Phytoplankton is a very important part of ecosystem and is extremely susceptible to environmental variations. Throughout this analysis we propose to assess a distribution of phytoplankton groups in an estuarine zone (the mouth of Oued Mazafran). and to establish distributions along the adjacent coast as a function of time and space concerned. Hydrological and phytoplankton samples were taken in 04 stations which were located in the region of (Oued Mazafran) from the period (17 January to 18 April) of 2018. The results of salinity, temperature, abundance, diatoms, diatom index and specific richness allow us to say: Stations 1 and 2: (Colonel Abbas beach and river mouth) we have the river's transition ecosystem with a high salinity variations from 16.32 to 30.33 at Station 2. and from 30.08 to 36.86 at Station 1. We note the presence of euryhaline species. Station 3: A freshwater environment (Mazafran Oued) salinities of 0.8 with a large temperature range of 12 to 18 °C and low oxygen concentration of 1.33 mg.dm-3 we have Phytoplankton species of freshwater.Stations 4: Seawater ecosystem with little variation (shellfish center). During this time the specific wealth reported at all stations is 343 species; we have 68.8 per cent of diatom. Station 3 (Oued Mazafran) registered its highest cell density of 11370 cell.dm-3.

Historical earthquakes in the Lower Segura basin (SE Spain): geological and archaeological evidence from pre-roman to modern times

This paper deals with the analysis of ancient and historical earthquakes in the Lower Segura Depression (SE Spain) at the northern end of the Eastern Betic Cordillera Shear Zone (EBSZ), which is defined within the area by the Lower Segura blind-thrust fault. The work summarizes and updates the existing information on the building and environmental damage dispersed throughout several historical documents, as well as the new historical and archaeological research on the area. The analyses performed consider the evolving paleogeography of the old estuarine zone defined by Ibero-Roman "Sinus ilicitanus" and the ancient prograding delta of the Segura River over the marshes. Topographic data from old descriptions of the zone together with the analysis of the geometry of the medieval irrigation system in the growing delta from pre-Roman to modern (18th century) times, allow the paleogeographic evolution of the zone, until the eventual artificial infilling of the old embayment, to be outlined. Several strong earth- quakes (Intensity ≥ VIII EMS-98) occurred in the area during different historical times. Building damage for the different events was variable depending on the number of settlements (and increasing population) within the ancient embayment. Maximum Intensity X during the most recent earthquake (AD 1829 Torrevieja) mainly occurred over old lands reclaimed in the 18 th century. In addition, dominant earthquake secondary effects (EEEs) were caused by liquefaction processes. This study analyzes the dimensions and distribution of these EEEs for the two main earthquakes in the zone during the years AD 1048 and AD 1829 using the ESI-07 intensity scale. The results draw important inferences on the role of ancient paleo-geography in seismic hazard data from past earthquakes.

ANÁLISE PRELIMINAR DOS SERVIÇOS ECOSSISTÊMICOS DO SISTEMA ESTUARINO DO RIO PIRANHAS-AÇU (RN)

As Áreas Úmidas (AUs) são ecossistemas inundados periodicamente, caracterizando-se como áreas naturais ou artificiais, apresentam uma biodiversidade totalmente adaptada às condições do ambiente. Tendo em vista o potencial ecológico, econômico surgiu a necessidade de se fazer um estudo dos serviços ecossistêmicos que esses ambientes apresentam. A pesquisa partiu da hipótese de que no complexo estuarino do rio Piranhas-Açu (RN) encontra-se uma diversidade significativa de áreas úmidas, decorrente da influência do clima semiárido. Deste modo, o presente estudo teve como objetivo realizar uma classificação dos serviços de provisão e culturalprestados pela área de estudo, que está localizada nos municípios de Macau e Porto do Mangue (RN). Para tanto, a metodologia empregada nesse trabalho foi dividida em duas etapas: 1) levantamento bibliográfico e cartográfico prévio da área; e 2) identificação preliminar dos serviços ecossistêmicos prestadas na zona estuarina Piranhas-Açu (RN). Pode-se constatar que os serviços ecossistêmicos identificados na zona estuarina foram listados de acordo com a classificação CICES, divididos em provisão (alimentação local/gastronomia; compostos químicos, biocombustíveis, entre outros) e culturais (remédios naturais, valor paisagístico, entre outros.). Sendo assim, estima-se que esta pesquisa venha a contribuir para estudos mais aprofundados sobre esta temática.Palavras-chave: Serviços ecossistêmicos; Áreas úmidas; CICES. ABSTRACTThe Wetlands are periodically flooded ecosystems, characterizing themselves as natural or artificial areas, biodiversity fully adapted to the environment. In view of the ecological potential, economic came the need to study the services ecosystems that these environments present. The research started from the hypothesis that in the estuarine complex of river Piranhas-Açu (RN), there is a diversity of wetlands, due to the influence of semi-arid climate. In this way, the present study had as objective to carry out a classification of the services of provision and cultural provided by the study area, which is located in the municipalities of Macau and Porto do Mangue (RN). Therefore, the methodology employed in this work was dividedintotwo steps: 1) bibliographic and cartographic survey of the area; and 2) preliminary identification of services ecosystems provided in the Piranhas-Açu (RN) estuarine area. Ecosystem services identified in the estuarine zone were listed according to the CICES classification, divided into local/gastronomy; chemical compounds, biofuels) and cultural (natural remedies, landscape value). Therefore, it is estimated that this research will contribute to more studies on this subject.Key words: Ecosystem services; Coastal wetlands; CICES.RESUMENLos humedales (UA) son ecosistemas periódicamente inundados, caracterizados como áreas naturales o artificiales, con una biodiversidad totalmente adaptada a las condiciones ambientales. En vista del potencial ecológico y económico, surgió la necesidad de estudiar los servicios ecosistémicos que presentan estos entornos. La investigación comenzó a partir de la hipótesis de que en el complejo estuarino Piranhas-Açu (RN) existe una diversidad significativa de humedales, debido a la influencia del clima semiárido. Por lo tanto, este estudio tuvo como objetivo clasificar la prestación y los servicios culturales prestados por el área de estudio, que se encuentra en los municipios de Macau y Porto do Mangue (RN). Por lo tanto, la metodología utilizada en este trabajo se dividió en dos etapas: 1) encuesta bibliográfica y cartográfica previa del área; y 2) identificación preliminar de los servicios ecosistémicos proporcionados en la zona estuarina de Piranhas-Açu (RN). Se puede ver que los servicios de los ecosistemas identificados en la zona del estuario se enumeraron de acuerdo con la clasificación CICES, divididos en suministro (comida / gastronomía local; compuestos químicos, biocombustibles, entre otros) y culturales (remedios naturales, valor paisajístico, entre otros.). Por lo tanto, se estima que esta investigación contribuirá a más estudios sobre este tema.Palabras clave: Servicios ecosistémicos; Humedales; CICES.

Linking agroecosystems producing farmed seafood with food security and health status to better address the nutritional challenges in Bangladesh

Objective:Aquaculture is one of the fastest-growing food production sectors in many low-income and food-deficit countries with aquatic ecozones. Yet its specific impact on nutrition and livelihood in local communities, where commercial and/or export-orientated aquaculture activities are developed, is largely unknown.Design:The present narrative and argumentative review aims to provide an overview of our current understanding of the connections between aquaculture agroecosystems, local and national fish production, fish consumption patterns and nutrition and health outcomes.Results:The agroecological dynamic in a coastal-estuarine zone, where the aquatic environment ranges from fully saline to freshwater, is complex, with seasonal and annual fluctuations in freshwater supply creating a variable salinity gradient which impacts on aquatic food production and on food production more generally. The local communities living in these dynamic aquatic ecozones are vulnerable to poverty, poor diet and health, while these ecosystems produce highly valuable and nutritious aquatic foods. Policies addressing the specific challenges of risk management of these communities are limited by the sectoral separation of aquatic food production – the fisheries and aquaculture sector, the broader food sector – and public health institutions.Conclusions:Here we provide an argument for the integration of these factors to improve aquaculture value chains to better address the nutritional challenges in Bangladesh.