Ground cover and native ant predation influence survival of metamorphic amphibians in a Southeastern pine savanna undergoing restoration

Objective: to determine the distribution of D. viscosa in the vicinity of the Guadalupe Victoria Dam in Durango, Mexico, for the years 1990, 2010 and 2017.Design/Methodology/Approach: Landsat satellite images were processed in order to carry out supervised classifications using an artificial neural network. Images from the years 1990, 2010 and 2017 were used to estimate ground cover of D. viscosa, pastures, crops, shrubs, and oak forest. This data was used to calculate the expansion of D. viscosa in the study area.Results/Study Limitations/Implications: the supervised classification with the artificial neural network was optimal after 400 iterations, obtaining the best overall precision of 84.5 % for 2017. This contrasted with the year 1990, when overall accuracy was low at 45 % due to less training sites (fewer than 100) recorded for each of the land cover classes.Findings/Conclusions: in 1990, D. viscosa was found on only five hectares, while by 2017 it had increased to 147 hectares. If the disturbance caused by overgrazing continues, and based on the distribution of D. viscosa, it is likely that in a few years it will have the ability to invade half the study area, occupying agricultural, forested, and shrub areas

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Ground-cover vegetation in wetland forests of the lower Suwannee River floodplain, Florida, and potential impacts of flow reductions

10.3133/wri024027 ◽

2002 ◽

Keyword(s):

Ground Cover ◽

River Floodplain ◽

Suwannee River ◽

Wetland Forests ◽

Ground Cover Vegetation

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Evoluzione della copertura vegetale in aree alpestri del Canton Ticino nel periodo 1971–2001 | Evolution of Vegetation Cover in the Alpine Regions of Canton Tessin: 1971–2001

Schweizerische Zeitschrift fur Forstwesen ◽

10.3188/szf.2004.0284 ◽

2004 ◽

Vol 155 (7) ◽

pp. 284-289 ◽

Cited By ~ 1

Author(s):

Pietro Stanga ◽

Niklaus Zbinden

Keyword(s):

Initial Conditions ◽

Ground Cover ◽

Climatic Conditions ◽

Human Pressure ◽

Aerial Photos ◽

Alpine Regions ◽

Subsequent Decrease ◽

Site Fertility ◽

Strong Expansion ◽

Evolution Of Vegetation

The retrospective study based on aerial photos (1971–2001) of the Canton Tessin made it possible to measure and analyze the evolution of the vegetation of eleven Alpine zones. The analysis shows a strong expansion of the arborescent vegetation and, at the same time, a decrease in other forms of ground cover (bush, shrub, meadow and unproductive spaces). Analysis of the data gives rise to the conjecture that the strong evolutionary dynamism evidenced by the areas under investigation is a result of the vast clearings carried out in past centuries to create pastures. Following the subsequent decrease in human pressure, nature today is attempting to rebalance the level of the biomass. These processes manifest themselves in different ways and with various intensity, depending on the interaction of numerous factors (e.g. climatic conditions, site fertility, initial conditions, evolution of anthropological pressure, etc.).

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Surfaces for sports areas. Method of test. Determination of ground cover of natural turf

10.3403/02873443 ◽

2003 ◽

Keyword(s):

Ground Cover ◽

Test Determination ◽

Natural Turf

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Genetic Diversity of Ground Cover Plant Potentilla anserina L.

Plant Science Journal ◽

10.3724/sp.j.1142.2010.40473 ◽

2010 ◽

Vol 30 (4) ◽

pp. 473-479

Author(s):

Rui-Jun MA ◽

Jian-Ying LU

Keyword(s):

Genetic Diversity ◽

Ground Cover ◽

Potentilla Anserina ◽

Ground Cover Plant

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Long-term Performance of Asian Pear Trees in Maryland

HortScience ◽

10.21273/hortsci.33.3.548b ◽

1998 ◽

Vol 33 (3) ◽

pp. 548b-548

Author(s):

C.S. Walsh ◽

A.J. Barton ◽

M. Newell ◽

G.R. Welsh

Keyword(s):

Ground Cover ◽

Organic Production ◽

Alternative Crop ◽

Asian Pear ◽

Marketable Fruit ◽

Long Term Performance ◽

Organic Fruit ◽

Term Performance ◽

Direct Market

Three Asian pear plantings were set during the past decade. Plantings included an initial cultivar planting on OH × F rootstock, the SE Zonal planting, and a rootstock by cultivar factorial. Fireblight susceptibility and survival were assessed in the first two plantings following a summer hailstorm. Trees were compared to Magness, a blight-tolerant buttery pear. Shin Li, Daisu Li, Shinsui, and Olympic were more resistant than Magness, while Chojuro and Niitaka were nearly as tolerant. Eleven other cultivars showed greater field-susceptibility. The most-susceptible cultivars were Ya Li and Ts'e Li. The third planting, which was managed “organically,” was set at a different University farm. Trees there were precocious and productive. A high percentage of marketable fruit was picked from that planting over a 4-year period. Fireblight damage in this planting was low, despite its “organic” production. Limited damage was attributed to early bloom date, ground cover management, and a lack of insect vectors to transmit the bacteria. Hosui, Seuri and Ts'e Li produced large-sized fruit. Shinko, 20th Century, Ya Li and Shinseiki fruit were too small to be marketable without heavy hand-thinning. Asian pears are an interesting alternative crop which are suited to direct-market enterprises or to specialty growers interested in producing organic fruit in the mid-Atlantic region.

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