scholarly journals Characteristics of atypical Huperzia selago subsp. arctica habitats to the south of distribution area

2012 ◽  
Vol 81 (2) ◽  
pp. 87-92 ◽  
Author(s):  
Ilona Jukonienė ◽  
Rasa Dobravolskaitė ◽  
Jūratė Sendžikaitė
Keyword(s):  
Vegetation Cover ◽  
Dominant Species ◽  
Natural Vegetation ◽  
Distribution Area ◽  
The South ◽  
Campylopus Introflexus

Two localities for <em>Huperzia selago </em>subsp. <em>arctica </em>are recorded from Lithuania, to the south of its known distribution area. The habitats of this subspecies are cutover peatlands whose natural vegetation was disturbed 6-8 years ago during peat exploitation. One of the dominant species of latest vegetation cover is the invasive bryophyte <em>Campylopus introflexus</em>. Characteristics of the habitats of <em>H. selago </em>subsp. <em>arctica </em>and the frequency of this taxon in populations were analysed.

scholarly journals Spatiotemporal Evolution of Fractional Vegetation Cover and Its Response to Climate Change Based on MODIS Data in the Subtropical Region of China

2021 ◽  
Vol 13 (5) ◽  
pp. 913
Author(s):  
Hua Liu ◽  
Xuejian Li ◽  
Fangjie Mao ◽  
Meng Zhang ◽  
Di’en Zhu ◽  
...  
Keyword(s):  
Vegetation Cover ◽  
Minimum Temperature ◽  
Maximum Temperature ◽  
Distribution Area ◽  
Spatiotemporal Pattern ◽  
Climate Factors ◽  
Important Indicator ◽  
Fractional Vegetation Cover ◽  
Annual Minimum Temperature ◽  
Total Study Area

The subtropical vegetation plays an important role in maintaining the structure and function of global ecosystems, and its contribution to the global carbon balance are receiving increasing attention. The fractional vegetation cover (FVC) as an important indicator for monitoring environment change, is widely used to analyze the spatiotemporal pattern of regional and even global vegetation. China is an important distribution area of subtropical vegetation. Therefore, we first used the dimidiate pixel model to extract the subtropical FVC of China during 2001–2018 based on MODIS land surface reflectance data, and then used the linear regression analysis and the variation coefficient to explore its spatiotemporal variations characteristics. Finally, the partial correlation analysis and the partial derivative model were used to analyze the influences and contributions of climate factors on FVC, respectively. The results showed that (1) the subtropical FVC had obvious spatiotemporal heterogeneity; the FVC high-coverage and medium-coverage zones were concentratedly and their combined area accounted for more than 70% of the total study area. (2) The interannual variation in the average subtropical FVC from 2001 to 2018 showed a significant growth trend. (3) In 76.28% of the study area, the regional FVC showed an increasing trend, and the remaining regional FVC showed a decreasing trend. However, the overall fluctuations in the FVC (increasing or decreasing) in the region were relatively stable. (4) The influences of climate factors to the FVC exhibited obvious spatial differences. More than half of all pixels exhibited the influence of the average annual minimum temperature and the annual precipitation had positive on FVC, while the average annual maximum temperature had negative on FVC. (5) The contributions of climate changes to FVC had obvious heterogeneity, and the average annual minimum temperature was the main contribution factor affecting the dynamic variations of FVC.

scholarly journals Methods of GI modeling of biogenic substances removal to the Gulf of Finland from forest vegetation cover

2020 ◽  
Vol 26 (2) ◽  
pp. 137-150
Author(s):  
Alexey Osipov ◽  
Georgy Osipov ◽  
Vasily Kovyazin
Keyword(s):  
Vegetation Cover ◽  
Catchment Area ◽  
Water Area ◽  
Forest Vegetation ◽  
Natural Vegetation ◽  
Water Bodies ◽  
Gulf Of Finland ◽  
Economic Activities ◽  
Biogenic Substances ◽  
The Gulf Of Finland

Biogenic pollution of water bodies and their eutrophication is one of the most serious environmental problems of our time. One of the sources of water pollution with biogenic substances is forests, which belong to the background sources of biogenic load. Currently available methods for assessing the removal of nutrients from the forest vegetation cover do not provide the desired results, which causes an urgent need for their improvement. This article describes the method developed by the authors of geoinformation modeling of removal of biogenic substances from the forest vegetation cover to water bodies, taking into account the spatial distribution of vegetation in the catchment area, its species composition and absorption of biogenic substances during their migration. The Eastern part of the Gulf of Finland was adopted as the object of testing of the developed method. this is due to the fact that eutrophication processes are actively manifested within its water area. The volume of the background biogenic load on the Gulf of Finland, formed during the decomposition of the fall of the natural vegetation cover in the catchment area, was determined based on the specific removal of biogenic substances from plant communities and their absorption during migration “plant community — water object”. The total background biogenic load on the eastern part of the Gulf of Finland, formed as a result of decomposition of natural vegetation cover, was 170.21 t/year for the northern catchment for nitrogen, 12.14 t/year for phosphorus, and 207.31 t/year for the southern catchment for nitrogen , and 15.68 t/year for phosphorus. The data obtained do not contradict the results of other authors who study the background biogenic load on the Gulf of Finland. The method can be effectively used in the development of measures to reduce the nutrient load on water bodies and planning of economic activities in catchments.

scholarly journals "Payneham Vale": integrated whole farm Planning

2003 ◽  
Vol 9 (1) ◽  
pp. 65
Author(s):  
R. S. Watkins
Keyword(s):  
Western Australia ◽  
Natural Vegetation ◽  
The South ◽  
Farm Planning ◽  
South West ◽  
The 1950S ◽  
Supplementary Feed ◽  
Eucalyptus Wandoo

IN 1908, Ron's grandfather, Issac Gray, took up an uncleared block of land 15 km north of Frankland in the south-west of Western Australia (see Fig. 1, Hobbs 2003). During that time he ran a few cattle in the bush and clearing of the native woodlands of Wandoo (white gum) Eucalyptus wandoo, J arrah E. marginata and Marri (Redgum) E. calophylla was slow and tedious. Ron's parents took over the farm in 1947, and with the advent of the bulldozer, clearing of Watkin's property and surrounding district began in earnest during the 1950s. Clearing continued as fast "as money permitted", until almost the last natural vegetation was knocked down in 1978 (Fig. 1). Annual pastures with some cropping (for supplementary feed) were the main source of fodder for sheep and cattle.

scholarly journals Global change affects differently at local scales animal populations: why Starlings still expands to the south while other temperate species go to the north?

2021 ◽  
Author(s):  
Alexandra Rodriguez ◽  
Giuseppe La Gioia ◽  
Patricia Le Quilliec ◽  
Damien Fourcy ◽  
Philippe Clergeau
Keyword(s):  
Climate Change ◽  
Global Change ◽  
Sturnus Vulgaris ◽  
European Starling ◽  
Distribution Area ◽  
The South ◽  
The North ◽  
Animal Populations ◽  
The World ◽  
Landscape Transformations

Global change, which regroups global warming, landscape transformations and other anthropic modifications of ecosystems, has effects on populations and communities and produces modifications in the expansion area of species. While some species disappear, other ones are beneficiated by the new conditions and some of them evolve in new adapted forms or leave their ancient distribution area. As climate change tends to increase the temperature in several regions of the world, some species have been seen to leave areas in equatorial regions in order to join colder areas either towards the north of the northern hemisphere or towards the south of the southern one. Many birds as have moved geographically in direction to the poles and in many cases they have anticipated their laying dates. Actually, two tit species that use to lay their eggs in a period that their fledging dates synchronize with the emerging dates of caterpillars are now evolving to reproductive in periods earlier than before the climate change. Several species are reacting like that and other ones are moving to the north in Europe for example. Nevertheless, and very curiously, European starling, Sturnus vulgaris, populations are behaving on the contrary: their laying dates are moving towards later spring and their distribution area is moving towards the south. In this study we explore and discuss about different factors that may explain this difference from other birds.

Biometric relationships of the Argentinean prawn Artemesia longinaris (Decapoda: Penaeidae) in the south-western Atlantic

2010 ◽  
Vol 90 (7) ◽  
pp. 1385-1393 ◽  
Author(s):  
L.F.C. Dumont ◽  
F. D'Incao
Keyword(s):  
Population Structure ◽  
Marked Reduction ◽  
The Other ◽  
Distribution Area ◽  
Southern Brazil ◽  
Simple Linear Regression ◽  
The South ◽  
Western Atlantic ◽  
Relative Growth ◽  
Autumn And Winter

Biometric relationships of size and weight were estimated for the Argentinean prawn (Artemesia longinaris), a new commercial penaeid prawn exploited in the south-western Atlantic. Morphometric and meristic traits were used to elucidate population structure of this species along its distribution area. The morphological relationships were estimated by a simple linear regression, considering total length (TL) as the dependent variable. The males collected in southern Brazil, an area under influence of the Subtropical Convergence, presented a slightly lower TL increment than females. A marked reduction in slopes of males between populations from southern Brazil was observed in autumn and winter. Additionally, relative growth in length of males from Argentina is similar to that observed during autumn and winter in southern Brazil. The other morphometric and meristic variables used also indicated higher similarities between southern Brazil and Argentina, which may be explained by relative growth associated to water temperatures or migration during winter, taking advantage of the oceanographic systems connecting both sites. Moreover, the population from Rio de Janeiro seems morphologically apart from the others, forming a separate unit stock.

scholarly journals Predicted thresholds for natural vegetation cover to safeguard pollinator services in agricultural landscapes

2020 ◽  
Vol 290 ◽  
pp. 106785
Author(s):  
Arnob Chatterjee ◽  
Soumik Chatterjee ◽  
Barbara Smith ◽  
James E. Cresswell ◽  
Parthiba Basu
Keyword(s):  
Vegetation Cover ◽  
Agricultural Landscapes ◽  
Natural Vegetation

The impact of recent land-use change in the Araucaria araucana forest in northern Patagonia

The Holocene ◽  
2020 ◽  
Vol 30 (8) ◽  
pp. 1101-1114 ◽  
Author(s):  
Ricardo Moreno-Gonzalez ◽  
Thomas Giesecke ◽  
Sonia L Fontana
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Vegetation Cover ◽  
Natural Vegetation ◽  
Northern Patagonia ◽  
Rumex Acetosella ◽  
Araucaria Araucana ◽  
The 1950S ◽  
The Impact ◽  
Nothofagus Dombeyi

Land-use change in the form of extensive Pinus plantations is currently altering the natural vegetation cover at the forest–steppe ecotone in northern Patagonia. Providing recommendations for conservation efforts, with respect to this recent and earlier land-use changes, requires a longer time perspective. Using pollen analysis, we investigated to what degree the colonization of the area by Euro-American settlers changed the forest composition and the vegetation cover, and to explore the spread of the European weed Rumex acetosella. This study is based on short sediment cores from six lakes in the Araucaria araucana forest region, across the vegetation gradient from the forest to the steppe. Results document that although Araucaria araucana has been extensively logged elsewhere, near the investigated sites, populations were rather stable and other elements of the vegetation changed little with the initiation of Euro-American settlements. A reduction of Nothofagus dombeyi-type pollen occurred at some sites presumably due to logging Nothofagus dombeyi trees, while toward the steppe, Nothofagus antarctica shrubs may have been removed for pasture. The appearance of Rumex acetosella pollen is consistent with the initiation of land use by Euro-American settlers in all cores, probably indicating the onset of animal farming. The rise of the Rumex acetosella pollen curve during the 1950s marks more recent land-use change. These observations indicate that the spread and local expansion of the weed requires disturbance. Overall, the study shows that the initial colonization of the area by Euro-American settlers had little effect on the natural vegetation structure, while developments since the 1950s are strongly altering the natural vegetation cover.

scholarly journals Dry grasslands of Hippocrepido glaucae-Stipion austroitalicae in the Pollino Massif (Calabria, Italy)

2016 ◽  
Vol 75 (1) ◽  
pp. 89-98 ◽  
Author(s):  
Massimo Terzi ◽  
Franceso S. D’Amico
Keyword(s):  
Southern Italy ◽  
Distribution Area ◽  
East Side ◽  
The South ◽  
Data Set ◽  
Dry Grasslands ◽  
Dimensional Scaling ◽  
New Association ◽  
Phytosociological Relevés ◽  
Multi Dimensional Scaling

Abstract Rocky pastures dominated by Stipa austroitalica in the south-east of Italy were classified within an endemic alliance, Hippocrepido glaucae-Stipion austroitalicae, originally assigned to a Balkan order (Scorzoneretalia villosae). Actually, the distribution area of S. austroitalica extends further westwards and large patches are found on the south-east side of the Pollino Massif. This study aims to describe and characterise the plant communities dominated by S. austroitalica in this area and analyse their floristic and chorological relationships with other associations of Hippocrepido-Stipion. Moreover, their syntaxonomy is discussed in the context of the Italian and south European dry grasslands biogeography. The grasslands were studied on the basis of 19 phytosociological relevés. A larger data set, including 185 relevés with S. austroitalica, was used to visualise the relationships among the associations through nonmetric multi-dimensional scaling ordination. The results allowed the description of a new association, Bupleuro gussonei-Stipetum austroitalicae, classified within Hippocrepido-Stipion. As a consequence, the alliance synrange was extended up to the Pollino Massif. The Hip pocrepido-Stipion, together with Cytiso spinescentis-Bromion erecti, was arranged in Euphorbietalia myrsinitidis, an endemic order of the Italian peninsula. The proposed scheme upgrades the syntaxonomy and nomenclature of the dry grasslands vegetation of central and southern Italy.

scholarly journals Diversity, Distribution and Morphological Characterization of Wild Macro Fungi from Gajni Forest

2020 ◽  
pp. 19-32
Author(s):  
D. R. B. Sonchita ◽  
F. M. Aminuzzaman ◽  
A. A. Joty ◽  
J. F. Tanni ◽  
M. N. Islam ◽  
...  
Keyword(s):  
Dominant Species ◽  
Morphological Characterization ◽  
The South ◽  
The North ◽  
Industrial Utilization ◽  
Wide Range ◽  
Made In

Survey on macro fungi was made in Gajni forest, Sherpur, Bangladesh which is located in between 24°18' and 25°18' north latitudes and in between 89°53' and 90°91' east longitudes. It is bounded by Meghalaya state of India on the north, Mymensingh and Jamalpur districts on the south with a wide range of ecosystem. The survey was conducted on July to December, 2018 to identify and preserve wood-rot causal macro fungi for future industrial utilization. Morphology of basidiocarp and characteristics of basidiospore were recorded. A total of 20 samples were collected and identified to 12 species belonging 7 families. Dominant species was Ganoderma species. The identified four species were from Ganodermataceae family and these were G. applanatum, G. lucidum, G. tropicum and G. lobetum. Other dominant genus was Russula. Other recorded genera were Hebeloma, Boletus, Phlebopus and Entoloma. Among them the highest frequency (85.72%) was recorded for G. applanatum and lowest frequency (7.14%) was recorded for Phlebopus marginatus. Similarly highest density (20.25%) was recorded for Agaricus sp. followed by G. lucidum (15.85%). The lowest density was (2.14%) was recorded for Phlebopus marginatus. Collected specimens were preserved in Sher-e-Bangla Agricultural University Herberium of Macro fungi (SHMF) for further study.

scholarly journals New identification of the moray eel Gymnothorax minor (Temminck & Schlegel, 1846) in China (Anguilliformes, Muraenidae)

ZooKeys ◽  
2018 ◽  
Vol 752 ◽  
pp. 149-161 ◽  
Author(s):  
Yuan Li ◽  
Liyan Zhang ◽  
Linlin Zhao ◽  
Ji Feng ◽  
Karhoe Loh ◽  
...  
Keyword(s):  
South China Sea ◽  
Dna Barcoding ◽  
South China ◽  
The South China Sea ◽  
The Body ◽  
Coi Gene ◽  
Valid Species ◽  
Distribution Area ◽  
The South ◽  
China Sea

A new identification of Gymnothoraxminor (Temminck &amp; Schlegel, 1846) is documented based on morphological characteristics and DNA barcoding. Sixty-one individuals of G.minor were collected from the East China Sea and the South China Sea. This species was previously reported as Gymnothoraxreticularis Bloch, 1795 in China because of the similarity in external shape and color. Gymnothoraxminor can be easily distinguished from G.reticularis by its color pattern of 18–20 irregular dark brown vertical bars and the body having scattered small brown spots. Additionally, the teeth are uniserial on both jaws, and the vertebrae number 137–139. By combining congener sequences of the cytochrome oxidase I (COI) gene from GenBank, two groups were detected among all the COI sequences of the currently named G.minor, which further indicated that two valid species were present based on genetic distance. A divergence also occurred on the number of vertebrae between the northern and southern populations. The phylogenetic and morphological analysis strongly supports that the northern and southern populations of G.minor are two different species. Furthermore, the distribution area of the northern G.minor has expanded southward to 5°15'N in the South China Sea. More specimens of G.minor and G.reticularis are crucial in order to define their geographical distribution boundaries and provide the correct DNA barcoding.

Sign in / Sign up

Export Citation Format

Share Document