scholarly journals How the Management May Affect Dispersal of Slender Speedwell (Veronica filiformis Smith) in Meadows and Pastures

2016 ◽  
Vol 24 (2) ◽  
pp. 32-40
Author(s):  
Božena Šerá ◽  
Milan Kobes
Keyword(s):  
Invasive Species ◽  
Cattle Grazing ◽  
Plant Population ◽  
The Other ◽  
Other Hand ◽  
Cattle Pasture

AbstractSlender speedwell (Veronica filiformis Smith, family Plantaginaceae) is a non-native and invasive species of grassland in the Europe. The aim of the study was to test the ability of the growth and spreading in nine differently managed grasslands (mowing, mulching, grazing). The best survival was found in two-years mowed lots with fertilisation and in all lots with not permanent cattle pasture crops. There were found the highest number of survived plants and plants with big “rosette“ diameters. Number of survived plant for two seasons was 18 and total number of vegetative peaks per plant was 688. The potential for the spreading of such plant population is great. On the other hand, plants did not survived in lots with mulch treatment and in fenced lots with permanent cattle grazing.

Now that we have our pest-proof fence, are we safe or trapped?

2012 ◽  
Vol 18 (2) ◽  
pp. 77 ◽  
Author(s):  
Heather Parks ◽  
Kyle Clifton ◽  
Lauren Best ◽  
Bridget Johnson
Keyword(s):  
Invasive Species ◽  
New Zealand ◽  
Native Species ◽  
Animal Species ◽  
The Other ◽  
Pest Species ◽  
Native Plant ◽  
Other Hand ◽  
Free Status

PEST-PROOF (exclusion) fences are designed to prevent non-native, predatory and pest species from repopulating an area set aside to protect vulnerable native plant and animal species. Pest-proof fencing provides security from invasive species, but can isolate the native species enclosed within. On one hand, some rare native species exist on the mainland due to the pest-free status achieved through the use of exclusion fences. On the other hand, these reintroduced populations are now isolated a situation where they would not be found naturally (Jamieson et al. 2006). Exclusion fences must be constantly maintained or the sanctuary risks reinvasion. An important question for conservation biologists and managers to answer is therefore — when is exclusion fencing the best option for protecting native species from introduced pests? We have drawn our examples from New Zealand and Australia where progress has been made with regard to the design and utilization of exclusion fences.

THE EFFECTS OF FALL GRAZING OR BURNING BLUEBUNCH WHEATGRASS RANGE ON FORAGE SELECTION BY DEER AND CATTLE IN SPRING

1980 ◽  
Vol 60 (1) ◽  
pp. 113-122 ◽  
Author(s):  
W. WILLMS ◽  
A. W. BAILEY ◽  
A. McLEAN ◽  
R. TUCKER
Keyword(s):  
Cattle Grazing ◽  
Grazing Pressure ◽  
Douglas Fir ◽  
The Other ◽  
Big Sagebrush ◽  
Effective Barrier ◽  
Other Hand ◽  
Bluebunch Wheatgrass ◽  
Made In

Studies were made in the big sagebrush-bluebunch wheatgrass and Douglas fir-bluebunch wheatgrass communities to examine the effects of fall burning and fall cattle grazing on springtime utilization of bluebunch wheatgrass by both deer and cattle. Deer and cattle displayed greatest preference for forage from the burned treatment and least preference for forage from the control. Grazing pressure by deer was not sufficient to cause the preference rankings among treatments to change. On the other hand, cattle readily switched preferences as availability among treatments changed. Utilization of other species appeared related to the utilization of bluebunch wheatgrass. Dead stubble of bluebunch wheatgrass influenced the height of grazing in spring. Deer were more affected by stubble than were cattle although deer were able to select closer to the height of short stubble and further below the height of long stubble. Dead stubble of small plants was a less effective barrier than that of large plants. This effect was particularly pronounced with cattle.

scholarly journals Changes of the Ecological Conditions in the Báb Forest on the Basis of a Bioindication Method

2014 ◽  
Vol 33 (3) ◽  
Author(s):  
Ivana Pilková
Keyword(s):  
Invasive Species ◽  
Significant Influence ◽  
Free Space ◽  
The Other ◽  
Ecological Conditions ◽  
Other Hand ◽  
Thermophilic Species ◽  
The Given

AbstractThis work analyses the changes of ecological conditions in the Báb forest on the basis of a bioindication method. The comparison is made between the phytocenological records from the years 1968-1969 and 2013 where permanent research plots (PRPs) were established in the forest coppi-ce and on clearcuts. In 2013, the amount of photophilous and thermophilic species increased mainly on the clearcut PRP and the amount of suboceanic taxa on PRP in the forest coppice. Moreover, there is also an increase of taxa like nitrogen-rich posts. On the other hand, the share of fresh soils indicators and acidophilous species significantly decreased. The change in the ratio of the econumbers of the observed ecofactors between the records from 1968-1969 and 2013 is caused mainly by a diversified management. It is the formation of clearcuts due to which synanthropic, clearcut and invasive species occupy the free space. The given species are mainly thermophilic, photophilous representatives and representatives of nitrogen-rich soils and they have a significant influence on the change in the percentual ratios of the econumbers of the six observed ecofactors.

scholarly journals Selected Diptera of City Park Kolmanka, Prešov (Slovakia)

2021 ◽  
Vol 70 (2) ◽  
pp. 125-134
Author(s):  
Jozef Oboňa ◽  
Paul L. Th. Beuk ◽  
Kateřina Dvořáková ◽  
Libor Dvořák ◽  
Patrick Grootaert ◽  
...  
Keyword(s):  
Invasive Species ◽  
Point Of View ◽  
The Other ◽  
Potential Vector ◽  
City Parks ◽  
Crop Pest ◽  
Other Hand ◽  
First Time ◽  
City Park

Abstract In total 65 Diptera species from 20 families (Anisopodidae (2 spp.), Asilidae (1), Bibionidae (1), Clusiidae (1), Culicidae (8), Dolichopodidae (7), Drosophilidae (4), Dryomyzidae (1), Empididae (2), Heleomyzidae (5), Hybotidae (5), Lauxaniidae (4), Limoniidae (9), Opomyzidae (2), Pallopteridae (2), Psychodidae (6), Rhagionidae (2), Scatopsidae (1), Trichoceridae (1) and Ulidiidae (1)) were recorded. The species Drapetis flavipes Macquart, 1834 (Hybotidae), is recorded for the first time in Slovakia. Ten species belong among uncommon or rare (namely: Atypophthalmus (Atypophthalmus) inustus (Meigen, 1818), Calliopum splendidum Papp, 1978, Dioctria linearis (Fabricius, 1787), Cheilotrichia (Empeda) neglecta (Lackschewitz, 1927), Chrysopilus asiliformis (Preyssler, 1791), Ochlerotatus (Ochlerotatus) nigrinus (Eckstein 1918), Philosepedon (Philosepedon) austriacum Vaillant, 1974, Suillia variegata (Loew, 1862), Toxoneura modesta (Meigen, 1830) and Trichomyia urbica Curtis, 1839). On the other hand, two invasive species are also reported. Drosophila (Sophophora) suzukii (Matsumura, 1931) is an invasive crop pest and Aedes (Finlaya) japonicus japonicus (Theobald, 1901) is an invasive biting pest, a potential vector for various diseases. City parks are also important from the point of view of Diptera biodiversity and more attention needs to be paid to them.

scholarly journals THE PERFORMANCE OF DAIRY CATTLE GRAZING TWO VARIETIES OF TALL FESCUE

1974 ◽  
pp. 200-208
Author(s):  
G.F. Wilson
Keyword(s):  
Dairy Cattle ◽  
Dairy Cows ◽  
Milk Production ◽  
Tall Fescue ◽  
Cattle Grazing ◽  
The Other ◽  
Animal Performance ◽  
Other Hand ◽  
Different Types ◽  
Clover Content

Two varieties of tall fescue were compared with 'Grasslands Ariki' ryegrass as feeds for lactating, and growing catmtle. In three shortterm experimeats the dairy cows grazing the different types of pasture produced similar quantities of milk and in most cases the fat and protein contents did not differ significantly. On the other hand, the exclusion of clover from the grass swards led to a lower milk production. Liveweight gains were consistently higher for yearling cattle grazing Ariki ryegrass compared with the two fescue swards. The invitro digestibility of S170 was lower than the value for G4710 but because of the high clover content of the S170 pastures animal performance was similar.

scholarly journals Carrying capacity of maize as cattle feed in North Sulawesi, Indonesia

2021 ◽  
Vol 306 ◽  
pp. 05010
Author(s):  
Paulus C. Paat ◽  
Derek Polakitan ◽  
Ratri Retno Ifada ◽  
J.H.W. Rembang
Keyword(s):  
Carrying Capacity ◽  
Financial Analysis ◽  
Biomass Productivity ◽  
Cattle Grazing ◽  
The Other ◽  
Cattle Feed ◽  
North Sulawesi ◽  
Other Hand ◽  
Maize Cultivation

North Sulawesi is one of the production centers of cattle as well as maize in Indonesia. On the other hand, there is problem in cattle grazing decrease causing some farmers cultivate maize as a forage, even though this it is still cultivated carelessly so that the biomass productivity is low. This study aimed to evaluate the use of applied innovations in maize cultivation as forages. The Demonstration plot was conducted in Kembuan, Minahasa Regency at elevation of 700 m above the sea, in June-October 2019. The method used Technology Display, where the innovation package included recommended maize cultivation such as superior seeds, fertilizers, pesticides and tractor using. Fertilizing in 12 dap, Urea 250 kg + NPK (15-15-15) 150 kg, then in 60 dap, Urea 125 kg and NPK (15-15-15) 100 kg. Weeding using herbicides at 30dap. Harvesting as fresh forage, all biomass at 75 dap, 35.64 tons/ha with TDN content 20.54 t/ha (58%) and provided a carrying capacity 11.34 UT, providing feed along the year. Financial analysis indicated the feasibilities, ROI coefficient 2.27 and BC Ratio 1.27. It can be concluded that maize farming can be a solution of forage fodder in cattle commodity areas.

A study of cometary eruptions through OH radio-lines

1999 ◽  
Vol 173 ◽  
pp. 249-254
Author(s):  
A.M. Silva ◽  
R.D. Miró
Keyword(s):  
Short Duration ◽  
Growth Curves ◽  
The Other ◽  
Initial Mass ◽  
Radio Lines ◽  
Other Hand ◽  
Sudden Rise

AbstractWe have developed a model for theH2OandOHevolution in a comet outburst, assuming that together with the gas, a distribution of icy grains is ejected. With an initial mass of icy grains of 108kg released, theH2OandOHproductions are increased up to a factor two, and the growth curves change drastically in the first two days. The model is applied to eruptions detected in theOHradio monitorings and fits well with the slow variations in the flux. On the other hand, several events of short duration appear, consisting of a sudden rise ofOHflux, followed by a sudden decay on the second day. These apparent short bursts are frequently found as precursors of a more durable eruption. We suggest that both of them are part of a unique eruption, and that the sudden decay is due to collisions that de-excite theOHmaser, when it reaches the Cometopause region located at 1.35 × 105kmfrom the nucleus.

Closing the GAP—A 5Å Scanning Microscope

1969 ◽  
Vol 27 ◽  
pp. 6-7
Author(s):  
A. V. Crewe
Keyword(s):  
Normal Form ◽  
The Other ◽  
Resolving Power ◽  
Scanning Microscope ◽  
Conventional Microscope ◽  
Other Hand ◽  
Closing The Gap ◽  
Thermal Sources ◽  
Better Than ◽  
Transmission Microscope

We have become accustomed to differentiating between the scanning microscope and the conventional transmission microscope according to the resolving power which the two instruments offer. The conventional microscope is capable of a point resolution of a few angstroms and line resolutions of periodic objects of about 1Å. On the other hand, the scanning microscope, in its normal form, is not ordinarily capable of a point resolution better than 100Å. Upon examining reasons for the 100Å limitation, it becomes clear that this is based more on tradition than reason, and in particular, it is a condition imposed upon the microscope by adherence to thermal sources of electrons.

Life Beyond 1MeV

1980 ◽  
Vol 38 ◽  
pp. 30-33
Author(s):  
K.H. Westmacott
Keyword(s):  
Electron Microscopy ◽  
Past Experience ◽  
The Other ◽  
Good Case ◽  
Other Hand ◽  
The U.S

Life beyond 1MeV – like life after 40 – is not too different unless one takes advantage of past experience and is receptive to new opportunities. At first glance, the returns on performing electron microscopy at voltages greater than 1MeV diminish rather rapidly as the curves which describe the well-known advantages of HVEM often tend towards saturation. However, in a country with a significant HVEM capability, a good case can be made for investing in instruments with a range of maximum accelerating voltages. In this regard, the 1.5MeV KRATOS HVEM being installed in Berkeley will complement the other 650KeV, 1MeV, and 1.2MeV instruments currently operating in the U.S. One other consideration suggests that 1.5MeV is an optimum voltage machine – Its additional advantages may be purchased for not much more than a 1MeV instrument. On the other hand, the 3MeV HVEM's which seem to be operated at 2MeV maximum, are much more expensive.

Can the Academic Self-Concept be Positive and Realistic?

2005 ◽  
Vol 19 (3) ◽  
pp. 129-132 ◽  
Author(s):  
Reimer Kornmann
Keyword(s):  
Academic Performance ◽  
Opposite Effect ◽  
Self Esteem ◽  
Point Of View ◽  
The Other ◽  
Self Concept ◽  
High Ability ◽  
Self Image ◽  
Other Hand

Summary: My comment is basically restricted to the situation in which less-able students find themselves and refers only to literature in German. From this point of view I am basically able to confirm Marsh's results. It must, however, be said that with less-able pupils the opposite effect can be found: Levels of self-esteem in these pupils are raised, at least temporarily, by separate instruction, academic performance however drops; combined instruction, on the other hand, leads to improved academic performance, while levels of self-esteem drop. Apparently, the positive self-image of less-able pupils who receive separate instruction does not bring about the potential enhancement of academic performance one might expect from high-ability pupils receiving separate instruction. To resolve the dilemma, it is proposed that individual progress in learning be accentuated, and that comparisons with others be dispensed with. This fosters a self-image that can in equal measure be realistic and optimistic.

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