scholarly journals THE EFFECT OF ABIOTIC FACTORS ON WATER EXCHANGE IN CONIFEROUS AND DECIDUOUS PLANTS

2018 ◽  
pp. 76
Author(s):  
Владислава Борисовна Придача ◽  
Галина Петровна Тихова ◽  
Татьяна Аркадьевна Сазонова ◽  
Vladislava Pridacha ◽  
Galina Tikhova ◽  
...  
Keyword(s):  
Water Exchange ◽  
Abiotic Factors

Effects of water exchange and abiotic factors on zooplankton and epibenthic fauna in shrimp ponds

2006 ◽  
Vol 37 (14) ◽  
pp. 1387-1399 ◽  
Author(s):  
Frank E Coman ◽  
Rod M Connolly ◽  
Nigel P Preston
Keyword(s):  
Water Exchange ◽  
Abiotic Factors ◽  
Shrimp Ponds ◽  
Epibenthic Fauna

scholarly journals ABIOTIC FACTORS AFFECTING THE ECOLOGICAL STATE OF LAKE NERO ACCORDING TO MATHEMATICAL MODELING. 2. TWO-PHASE MASS TRANSFER IN THE WATER AREA

2020 ◽  
pp. 28-37
Author(s):  
Sh. Pozdnyakov ◽  
S. Kondratiev ◽  
M. Shmakova
Keyword(s):  
Sediment Transport ◽  
Water Exchange ◽  
Abiotic Factors ◽  
Analytical Formula ◽  
Water Area ◽  
Design Solution ◽  
Practical Implementation ◽  
Aquatic Area ◽  
Project Proposal ◽  
Design Solutions

For the shallow Lake Nero, calculations of currents, sediment transport and the intensity of bottom reformation in various hydrometeorological situations were performed. The calculations were carried out using a two-dimensional model of currents and sediment transport in a shallow reservoir and an analytical formula for sediment discharge developed at the Institute of Limnology of the Russian Academy of Sciences. Numerical experiments have been carried out to assess the possible consequences of the implementation of two design solutions aimed at improving water exchange for the recovery of Lake Nero. According to the first decision, it was planned to excavate bottom sediments within the city limits of Rostov in order to increase the depths in the coastal zone of the lake. Calculations showed that for a section of the water area with a deep bottom, the current velocities decrease several times (in some areas, to zero values). The sediment rate will slightly increase directly in the deepening section due to the increase in the cross-sectional area of the flow. Therefor this event will not bring any positive effect. The second project proposal was to be aimed at increasing the transit capacity of the longitudinal section of the aquatic area from the mouth of the main tributary of Sara River to the inflow of Veksa River. Calculations have shown that an increase in depth along the indicated trajectory while maintaining the transferred amount of water masses will also lead to a decrease in the speed of currents. Based on the simulation, it can be concluded that the practical implementation of the presented design solutions will not lead to an improvement in water exchange in the lake, but also vice versa, will contribute to the formation of stagnant zones, especially for the first proposed design solution.

The main principles and results of pollution monitoring of sediments in the river basin

2020 ◽  
pp. 14-20
Author(s):  
B. Korzhenevsky ◽  
Gleb Tolkachev ◽  
Nikolay Kolomiycev
Keyword(s):  
Heavy Metals ◽  
River Basin ◽  
Water Exchange ◽  
Pollution Monitoring ◽  
Small Rivers ◽  
Volga River ◽  
Natural Landscape ◽  
Volga River Basin ◽  
Ivankovo Reservoir ◽  
Selection Of

The problems of modern geological ecology associated with the study of pollution of sediments of water bodies by heavy metals are considered. The Volga River basin is quite heterogeneous, both in geomorphological and hydrological terms, and in thechnogenical development and usage. A fourrank taxonomy is presented for the selection of sites for monitoring, based on a combination of natural, landscape, climatic and thechnogenical factors. To the largest – the highest taxon – sites of the Ist category – bowls of reservoirs with the slopes and the urban zones, industrial and agricultural structures located within them are carried. Within these areas are allocated to smaller taxa, areas category IInd are the industrial and urban zones, areas category IIIrd are the small rivers without significant contamination and areas category IVth to conduct special observations. The examples of special observations in the study of the annual migration of heavy metals in the system «bottom sediments – water column» on the Ivankovo reservoir are highlighted. The investigations were carried out under the conditions of the standard flow rate for this reservoir and in the conditions of slow water exchange.

Density-driven water exchange controls seasonal declines in jellyfish (Aurelia aurita) abundance in a shallow fjord system

2018 ◽  
Vol 597 ◽  
pp. 137-145 ◽  
Author(s):  
J Goldstein ◽  
C Jürgensen ◽  
UK Steiner ◽  
HU Riisgård
Keyword(s):  
Water Exchange ◽  
Aurelia Aurita ◽  
Fjord System

Coral husbandry for ocean futures: leveraging abiotic factors to increase survivorship, growth, and resilience in juvenile Montipora capitata

2021 ◽  
Vol 657 ◽  
pp. 123-133
Author(s):  
JR Hancock ◽  
AR Barrows ◽  
TC Roome ◽  
AS Huffmyer ◽  
SB Matsuda ◽  
...  
Keyword(s):  
Abiotic Factors ◽  
Larval Rearing ◽  
Abiotic Conditions ◽  
Montipora Capitata ◽  
Reef Restoration ◽  
Juvenile Corals ◽  
Bleaching Response ◽  
The Face ◽  
Survival And Growth ◽  
Global And Local

Reef restoration via direct outplanting of sexually propagated juvenile corals is a key strategy in preserving coral reef ecosystem function in the face of global and local stressors (e.g. ocean warming). To advance our capacity to scale and maximize the efficiency of restoration initiatives, we examined how abiotic conditions (i.e. larval rearing temperature, substrate condition, light intensity, and flow rate) interact to enhance post-settlement survival and growth of sexually propagated juvenile Montipora capitata. Larvae were reared at 3 temperatures (high: 28.9°C, ambient: 27.2°C, low: 24.5°C) for 72 h during larval development, and were subsequently settled on aragonite plugs conditioned in seawater (1 or 10 wk) and raised in different light and flow regimes. These juvenile corals underwent a natural bleaching event in Kāne‘ohe Bay, O‘ahu, Hawai‘i (USA), in summer 2019, allowing us to opportunistically measure bleaching response in addition to survivorship and growth. This study demonstrates how leveraging light and flow can increase the survivorship and growth of juvenile M. capitata. In contrast, larval preconditioning and substrate conditioning had little overall effect on survivorship, growth, or bleaching response. Importantly, there was no optimal combination of abiotic conditions that maximized survival and growth in addition to bleaching tolerances. This study highlights the ability to tailor sexual reproduction for specific restoration goals by addressing knowledge gaps and incorporating practices that could improve resilience in propagated stocks.

Characterizing the impact of recovering sea otters on commercially important crabs in California estuaries

2020 ◽  
Vol 655 ◽  
pp. 123-137
Author(s):  
TM Grimes ◽  
MT Tinker ◽  
BB Hughes ◽  
KE Boyer ◽  
L Needles ◽  
...  
Keyword(s):  
Abiotic Factors ◽  
Sea Otter ◽  
Dungeness Crab ◽  
Sea Otters ◽  
Elkhorn Slough ◽  
Enhydra Lutris Nereis ◽  
Crab Abundance ◽  
Population Sizes ◽  
Commercially Important ◽  
The Impact

Protective legislation and management have led to an increase in California’s sea otter Enhydra lutris nereis population. While sea otter recovery has been linked to ecosystem benefits, sea otter predation may negatively affect commercially valuable species. Understanding the potential influence of sea otters is of particular importance as their range expands into estuaries that function as nurseries for commercially valuable species like Dungeness crab Metacarcinus magister. We consider how sea otter predation has affected the abundance and size of juvenile Dungeness crab in Elkhorn Slough, California, USA, and analyzed cancrid crab abundance and size across 4 California estuaries with and without sea otters to understand how biotic and abiotic factors contribute to observed variation in crab size and abundance. We compared trends in southern sea otters relative to Dungeness crab landings in California to assess whether increasing sea otter abundance have negatively impacted landings. In Elkhorn Slough, juvenile Dungeness crab abundance and size have declined since 2012, coinciding with sea otter population growth. However, the impact of sea otters on juvenile Dungeness crab size was habitat-specific and only significant in unvegetated habitat. Across estuaries, we found that cancrid crab abundance and size were negatively associated with sea otter presence. While abiotic factors varied among estuaries, these factors explained little of the observed variation in crab abundance or size. Although we found evidence that sea otters can have localized effects on cancrid crab populations within estuaries, we found no evidence that southern sea otters, at recent population sizes, have negatively impacted Dungeness crab landings in California from 2000-2014.

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