scholarly journals Influence of beech forests fragmentation of Stilsky Hillside on their microclimatic parameters

2020 ◽  
pp. 81-88
Author(s):  
Oleg Оrlov ◽  
Maryna Ragulina
Keyword(s):  
Water Temperature ◽  
Edge Effect ◽  
Temperature Regime ◽  
Biodiversity Loss ◽  
Beech Forests ◽  
Small Areas ◽  
Regime Changes ◽  
Interior Forest ◽  
Floristic Structure ◽  
Sensitive Marker

Estimation of changes in the microclimatic parameters of beech forests of the Stilsky Hillside, by measuring the water-temperature indicators of the soil regime and bryoindication, were performed. Fragmentation of forest causes significant changes in microclimatic parameters in bondary habitats areas, which leads to both biodiversity loss and a decrease of the unchanged forest areas. In fragmented beech forests, the influence of the edge effect on the water-temperature regime of soils is observed within a distance of 20-40 meters, but the eco-floristic structure of nemoral moss vegetation is stabilized only at a distance from 160 m. Thus, bryobiontes are a shown to be a sensitive marker of the microclimatic regime changes in a fragmented ecosystem. In the studied beeches Metzgeria furcata, Radula complanata, Anomodon attenuatus, A. viticulosus, Cirriphyllum crassinervium are indicators of the "interior forest". The determined amplitude of the edge effect indicates the fragmentation as a crucial factor on the small areas of forest and its role in the loss of climate-sensitive groups of biota, primarily mosses.

Analysis of the water temperature regime of the Danube and its tributaries in Croatia

2008 ◽  
Vol 22 (7) ◽  
pp. 1014-1021 ◽  
Author(s):  
Ognjen Bonacci ◽  
Dušan Trninić ◽  
Tanja Roje-Bonacci
Keyword(s):  
Water Temperature ◽  
Temperature Regime

scholarly journals Temperature regime of the Daginsky thermal springs (Sakhalin Island) during their reconstruction in 2019-2021

2021 ◽  
Vol 946 (1) ◽  
pp. 012032
Author(s):  
R V Zharkov
Keyword(s):  
Water Temperature ◽  
Temperature Regime ◽  
Sakhalin Island ◽  
Thermal Springs ◽  
Surrounding Area ◽  
Bottom Up ◽  
Surrounding Landscape

Abstract The article presents the results of studies of the temperature regime of the Daginsky thermal springs. Daginsky thermal springs are the most famous and visited on Sakhalin Island (Russia). In the fall of 2019, their reconstruction and arrangement of the surrounding landscape began. As a result of the reconstruction of the main thermal springs, their hydrological and temperature regime was violated, the water temperature dropped. In 2020, in the springs most popular with visitors (Aleksandrovsky, Tsentralny, Mechta), the temperature became several degrees lower, which led to the termination of their use. In 2021, after the completion of the design of the spring bath and the surrounding area, the temperatures increased. In April 2021, the temperature of the Patriot spring was 40.5 °C, the Partizan spring 38–39 °C, the Central spring 36–39 °C, the Aleksandrovsky spring 34.6–36.0 °C, the Mechta spring 34.4 °C (at the bottom up to 45.5 °C), Molodost spring 35 °C (at the bottom up to 37–41.3 °C).

scholarly journals Reconciling global priorities for conserving biodiversity habitat

2019 ◽  
Author(s):  
K. Mokany ◽  
S. Ferrier ◽  
T.D. Harwood ◽  
C. Ware ◽  
M. Di Marco ◽  
...  
Keyword(s):  
Natural Habitat ◽  
Biodiversity Loss ◽  
Spatially Explicit ◽  
Habitat Condition ◽  
Biodiversity Crisis ◽  
Small Areas ◽  
Natural Systems ◽  
Threatened Habitat ◽  
Fine Resolution ◽  
Global Data

AbstractDegradation and loss of natural habitat is the major driver of the current global biodiversity crisis. Most habitat conservation efforts to date have targeted small areas of highly threatened habitat, but emerging debate suggests retaining large intact natural systems may be just as important. We reconcile these perspectives by integrating fine-resolution global data on habitat condition and species assemblage turnover, to identify Earth’s high-value biodiversity habitat. These are areas in better condition than most other locations once supporting a similar assemblage of species, and are found within both intact regions and human dominated landscapes. However, only 18.6 % of this high-value habitat is currently protected globally. Averting permanent biodiversity loss requires clear spatially explicit targets for retaining these unprotected high-value habitats.

scholarly journals An experience of obtaining mature eggs of the Siberian sturgeon (Acipenser baerii (Brandt, 1869)) in non-traditional period

2021 ◽  
pp. 29-39
Author(s):  
S. Pashko ◽  
◽  
M. Pashko ◽  
O. Tretiak ◽  
O. Kolos ◽  
...  
Keyword(s):  
Water Temperature ◽  
Temperature Regime ◽  
Siberian Sturgeon ◽  
Winter Period ◽  
Gonad Maturation ◽  
Average Weight ◽  
Forest Steppe ◽  
Egg Maturation ◽  
Study Results ◽  
Brood Fish

Purpose. To investigate the peculiarities of obtaining ovulated eggs of the Siberian sturgeon in hatchery conditions in non-traditional (winter) period and determine major features of brood fish used for the experiments. Methodology. The material for the study were age-10+ Siberian sturgeon females with body weights of 6.20-8.24 kg grown in conditions of floating cages in a water body with natural temperature regime of the forest-steppe zone of Ukraine. The experiments were conducted with a regulated water temperature regime in the third decade of January with the use of natural gonadotropic drugs for the stimulation of egg maturation in fish. Brood fish were prepared for the experiment in the recirculating aquaculture system. Measurement of fisheries parameters and study of physicochemical factors of the aquatic medium were performed according to generally accepted methods. Experiment results were assessed statistically using standard software. Findings. With water temperature of 14-15оС, depending on the dosage of the gonadotropic drug, different efficiencies of gonad maturation in experimental groups of fish were detected. More than 85% of females matured after dosing of gonadotropic drugs 3.5 and 4.5 mg / kg. In the version with a minimum dose of gonadotropic substance 2.5 mg / kg responded positively to hormonal stimulation 57% of females. The average weight of eggs obtained in some groups of brood fish was 819.5-1079.0 g. Average working fecundity and relative working fecundity in experimental groups of the Siberian sturgeon females varied within 47.95-52.64 thousand eggs and 6.93-7.17 thousand eggs/kg of fish body weight, respectively. The duration of maturation after the second (resolving) administration of the gonadotropic drug until the moment of the occurrence of the ovulation process varied mainly within 15-20 hours. Originality. The peculiarities of obtaining mature eggs of the Siberian sturgeon with the use of methods of industrial reproduction of sturgeons, which are new for the aquaculture of Ukraine, were studied. Practical value. The study results are of interest for the development of modern methods of sturgeon aquaculture in conditions of fish farms of industrial type. Key words: brood Siberian sturgeon, industrial aquaculture, non-traditional technologies, eggs, ovulation, fisheries parameters.

scholarly journals Tree mortality, recruitment and growth in a bamboo dominated forest fragment in southwestern Amazonia, Brazil

2013 ◽  
Vol 13 (2) ◽  
pp. 29-34 ◽  
Author(s):  
Herison Medeiros ◽  
Wendeson Castro ◽  
Cleber Ibraim Salimon ◽  
Izaias Brasil da Silva ◽  
Marcos Silveira
Keyword(s):  
Growth Rate ◽  
Edge Effect ◽  
Tree Mortality ◽  
Biodiversity Loss ◽  
Average Diameter ◽  
Recruitment Rate ◽  
Diameter Growth ◽  
Time Interval ◽  
Forest Fragment ◽  
Southwestern Amazonia

Forest fragmentation affects the structure and dynamics of plant communities, leading to biodiversity loss in forest remnants. In this paper we show that in a bamboo (Guadua weberbaueri Pilger) dominated forest fragment in southwestern Amazonia edge effect may be confounded by bamboo effect, which also occur inside the forest. We measured growth, mortality and, recruitment rate of trees with DBH ≥ 10 cm, in a fragment of bamboo dominated open forest in southwestern Amazonia, state of Acre, Brazil, in 15 plots at the forest edge and 15 plots inside the forest fragment, 500 m away from the border. Time interval between censuses was 1.8 years. The average diameter growth rate differed significantly between edge (3.82 ± 0.10 mm a-1) and interior (2.39 ± 0.18 mm a-1); but there were no differences in annual mortality rate (edge = 3.8 ± 2.5 % a-1 CV = 65.7%; interior = 3.6 ± 2.6% a-1 CV = 72.2%) or in annual recruitment rate (edge = 7.1 ± 3.2% a-1 CV = 45%; interior = 8.9 ± 7.9% a-1 CV = 88.7%). Diameter growth rate, particularly of pioneer and fast-growing trees, is favored by the environmental conditions of the edge, where bamboo abundance is higher. However, the absence of an edge effect on mortality and recruitment could be due to the particular dynamics of bamboo patches, which could be mimicking forest edges and therefore masking possible edge effect in this fragment. We speculate that the mortality and recruitment patterns in fragmented forests of southwestern Amazonia is different from other areas in Amazonia and that bamboo is one of the key controllers of successional processes in these fragments.

scholarly journals Amazon fire regimes under climate change scenarios

2021 ◽  
Author(s):  
Leonardo Saravia ◽  
Ben Bond-Lamberty ◽  
Samir Suweis
Keyword(s):  
Climatic Change ◽  
Fire Regime ◽  
Remote Sensing Data ◽  
Biodiversity Loss ◽  
Fire Regimes ◽  
Climate Projections ◽  
Climate Change Scenarios ◽  
Regime Changes ◽  
Critical Transitions ◽  
In Fire

Fire is one of the most important disturbances of the earth-system, shaping the biodiversity of ecosystems and particularly forests. Anthropogenic drivers such as climatic change and other human activities could produce potentially abrupt changes in fire regimes, triggering more profound transformations like the transition from forests to savannah or grasslands ecosystems. Large biodiversity loss could be produced if these transitions occur. Climatic change could cause conditions that enhance fire ignition and spread, which may potentially produce more extensive, intense, and frequent fires. In this work, by considering climate projections for the 21st century, we evaluate the possible changes in the Amazon region's fire regime. We parametrize a fire model using remote sensing data on fire extension and temperature. In the context of our model, there are two possible regime changes: the critical regime that implies high variability in fire extension and mega-fires, and an absorbing phase transition which would produce the extinction of the forest and transition to a different vegetation state. The fitted model and the projections suggest that the Amazon region is not close to any of these regime changes, but other factors not included in the model could result crucial in determining such critical transitions.

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