Evaluation of a Mechanical Population Reduction of Black Crappie and Black Bullheads in a Small Wisconsin Lake

1983 ◽  
Vol 3 (1) ◽  
pp. 41-47 ◽  
Author(s):  
David A. Hanson ◽  
Brian J. Belonger ◽  
Dean L. Schoenike
Keyword(s):  
Population Reduction

Control of Silvery-Thread Moss (Bryum argenteum Hedw.) in Creeping Bentgrass (Agrostis palustris Huds.) Putting Greens

2004 ◽  
Vol 18 (3) ◽  
pp. 560-565 ◽  
Author(s):  
Keith D. Burnell ◽  
Fred H. Yelverton ◽  
Joseph C. Neal ◽  
Travis W. Gannon ◽  
J. Scott McElroy
Keyword(s):  
Ferrous Sulfate ◽  
Field Experiments ◽  
Creeping Bentgrass ◽  
Nitrogen Fertilizers ◽  
Agrostis Palustris ◽  
Putting Greens ◽  
Rainfall Events ◽  
Population Reduction ◽  
Elk River ◽  
Turfgrass Quality

Field experiments were conducted to evaluate chemicals for silvery-thread moss control and bentgrass turfgrass quality. Treatments included iron (Fe)-containing products, nitrogen fertilizers, Ultra Dawn dishwashing detergent (UD) at 3% (v/v), and oxadiazon. In general, greater silvery-thread moss control was achieved with Fe-containing products. Ferrous sulfate at 40 kg Fe/ha plus ammonium sulfate at 30 kg N/ha, a combined product of ferrous oxide, ferrous sulfate, and iron humates (FEOSH) at 125 kg Fe/ha, and a combined product of iron disulfide and ferrous sulfate (FEDS) at 112 kg Fe/ha reduced silvery-thread moss populations 87, 81, and 69%, respectively, 6 wk after initial treatment (WAIT). UD reduced silvery-thread moss populations 57% 6 WAIT. The addition of oxadiazon to Fe-containing treatments did not improve silvery-thread moss population reduction. Other experiments evaluated two formulations of chlorothalonil, each applied at two rates, chlorothalonil with zinc at 9.5 and 17.4 kg ai/ha and chlorothalonil without zinc at 9.1 and 18.2 kg/ ha, and two spray volumes (2,038 and 4,076 L/ha). Greater silvery-thread moss population reduction was observed at Jefferson Landing in 1999 compared with Elk River in 1999 and 2000. Rainfall events at Elk River in 1999 and 2000 within 24 h after application and no rain at Jefferson Landing may account for variation in performance of products between sites. However, no difference in chlorothalonil formulation, rate, or spray volume was observed in any location or year. These data indicate that Fe-containing fertilizers or chlorothalonil can be used to reduce silvery-thread moss populations in creeping bentgrass putting greens.

scholarly journals A survey on occurrence of internal and external fish parasites and causes of fish population reduction in Lake Hashenge, Tigray, Ethiopia

2017 ◽  
Vol 21 (2) ◽  
pp. 75
Author(s):  
Abreha Tesfaye ◽  
Awot Teklu ◽  
Tilaye Bekelle ◽  
Tsegay Tkue ◽  
Etsay Kebede ◽  
...  
Keyword(s):  
Fish Population ◽  
Fish Parasites ◽  
Population Reduction

scholarly journals IS IT FORBIDDEN THE WOOD USE OF Araucaria angustifolia? AN ANALYSIS ON THE CURRENT LEGAL BUDGET

FLORESTA ◽  
2019 ◽  
Vol 50 (1) ◽  
pp. 971
Author(s):  
Rozane De Loyola Eisfeld ◽  
Julio Eduardo Arce ◽  
Carlos Roberto Sanquetta ◽  
Evaldo Muñoz Braz
Keyword(s):  
Economic Growth ◽  
Forest Management ◽  
Forest Sector ◽  
Araucaria Angustifolia ◽  
Commercial Use ◽  
Population Reduction ◽  
Forest Use ◽  
The Right ◽  
Number Of Individuals ◽  
Official Data

The objective of this work was to analyze the legal arrangements on a very complex theme in the forest sector: the use of a species threatened with extinction, araucaria. After years of intense deforestation, linked to the country's economic growth, after 1960 decade, it was edited an array of regulations aimed to control the forest use through strict laws and expansion of the environmental bureaucracy. In 2014, MMA Decree 443, araucaria was included in the danger category, restricting any timber use, including the ones gathered under forest management. The justification for this inclusion comes from the population reduction, deforestation and logging. Regarding the justification of its inclusion, it is important to note the non-disclosure of official data, an obligation of the State, on the remaining area and number of individuals. Decree 443 collides with the Brazilian forest low removing rights, as forest management, not established by Law number 12.651 of 2012. It also defies the Complementary Law 140 which establishes reports and technical-scientific studies for framing the listed species. Nor does it comply with the steps required in article 5º MMA Decree 43, which precedes Decree 443. By analyzing the regulations regarding the araucaria and its commercial use: there is no law prohibiting the use, through management and planting; what exists are Decrees and resolutions. Whoever is in the messianic right to forbid the cutting of the species, subsidizes itself in Decrees and resolutions. Moreover, who believes they have the right to cut it, is not aware of the legislation.

Population Dynamics of Municipalities in Central Russia

2017 ◽  
Vol 2017 (6) ◽  
pp. 97-124
Author(s):  
Irina Kalabikhina ◽  
Denis Mokrensky
Keyword(s):  
Population Dynamics ◽  
Elderly Population ◽  
Population Change ◽  
Population Decline ◽  
The Elderly ◽  
Second Stage ◽  
Central Russia ◽  
Population Concentration ◽  
Population Reduction ◽  
Demographic Policy

In this paper we present the results of the analysis of the population change in nonmetropolitan city municipalities by components and concentration of population in the municipalities were investigated, their typologization was developed in accordance with the contribution of various components to population dynamics. The article discusses the limitations of municipal statistics. The methods of average values, the balance equation, and the measures of population concentration are used. The main conclusions confirm the trends of population decline at the second stage of demographic policy, territorial unevenness and concentration of population in administrative centers and the closest settlements to them. Less than 2% of the municipalities in question demonstrate both natural and migratory growth, and in 70% of municipalities both migration and natural components make a contribution to population reduction. The relatively high proportion of the elderly population was observed in the studied municipalities; crude birth and death rates were worse than the average in the district.

scholarly journals Structure of the Assemblages of Spiders in Mediterranean Pear Orchards and the Effect of Intensity of Spraying

Insects ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 553 ◽  
Author(s):  
Luis de Pedro ◽  
María Carmen Ortín-Angulo ◽  
Jesús Miñano ◽  
Elena López-Gallego ◽  
Juan Antonio Sanchez
Keyword(s):  
Negative Impact ◽  
Southern Spain ◽  
Low Intensity ◽  
Population Reduction ◽  
Pear Trees ◽  
Hunting Mode ◽  
The Impact ◽  
Predatory Arthropods

Spiders are key predatory arthropods that are negatively affected by spraying pesticides in orchards. The aim of this research was to determine the structure of the community of spiders in pear orchards and the impact of the intensity of spraying. The study was carried out over three years in four pear orchards in southern Spain; two of them were conducted by ourselves with no or low-intensity spraying of insecticides, and two under the criteria of technicians (conventional). Spiders were sampled on pear trees by the beating method. The orchards hosted a rich community of spiders belonging to 13 different families and 51 genera. However, the genera Philodromus, Oxyopes, Cheiracanthium, Icius, and Neoscona accounted for 72% of the captures. Spiders were more abundant and had a higher richness of genera in the low-intensity spraying than in conventional orchards. Philodromidae, Salticidae, and Cheiracanthiidae experienced a significant population reduction in conventional orchards, while Araneidae, Linyphiidae, and Thomisidae were not significantly affected by the intensity of spraying. The wandering hunting mode could explain the negative impact on Philodromidae, Salticidae, and Cheiracanthiidae but does not explain the lack of effect on Oxyopidae and Thomisidae. No significant effect was found on any family of web builders.

A direct comparison of trapping and spotlight searches for capturing Brown Tree Snakes on Guam

2001 ◽  
Vol 7 (1) ◽  
pp. 4 ◽  
Author(s):  
R. M. Engeman ◽  
D. S. Vice
Keyword(s):  
Forest Edge ◽  
Management Programme ◽  
Night Time ◽  
Brown Tree Snake ◽  
Population Reduction ◽  
Reduction Methods ◽  
Capture Method ◽  
Standard Practices ◽  
Brown Tree Snakes ◽  
Over Time

Brown Tree Snake populations on Guam are controlled in the vicinities of cargo staging and transport areas to prevent their dispersal from Guam, and their populations are controlled in areas where endangered species are to be reintroduced. Trapping and night-time spotlight searches of fences are the two primary Brown Tree Snake population reduction methods used on Guam. We conducted a three month study comparing Brown Tree Snake captures by spotlighting fences to captures by trapping. Traps were placed either on the edge of the forest paralleling the fences, or they were hung on the fences. Applications of each capture method followed the standard practices used within the operational programme charged with deterring the spread of Brown Tree Snakes from Guam. We found captures by trapping to exceed those by spotlighting each month, but the captures by trapping decreased substantially over time, while those by spotlighting did not. We detected no differences statistically between numbers of captures taken by traps hung on the forest edge versus those hung on the fences. We found no differences in sizes of Brown Tree Snakes captured by spotlighting and trapping, based on average snout-vent length (SVL) or the distribution of SVLs. We feel that the two capture methods complement each other in an integrated pest management programme.

Survival of Lactobacillus delbrueckii UFV H2b20 in fermented milk under simulated gastric and intestinal conditions

2013 ◽  
Vol 4 (3) ◽  
pp. 285-289 ◽  
Author(s):  
L.L. da Conceição ◽  
E.S. Leandro ◽  
F.S. Freitas ◽  
M.N.V. de Oliveira ◽  
A.B. Ferreira-Machado ◽  
...  
Keyword(s):  
Gastrointestinal Tract ◽  
Storage Period ◽  
Fermented Milk ◽  
Storage Conditions ◽  
Lactobacillus Delbrueckii ◽  
Refrigerated Storage ◽  
Human Gastrointestinal Tract ◽  
Log Reduction ◽  
Population Reduction ◽  
Potential Use

The survival of Lactobacillus delbrueckii UFV H2b20 was assessed in fermented milk, both during the storage period and after exposure to simulated gastric and intestinal juices, as well the detection of the gene fbpA involved in adherence to human gastrointestinal tract. L. delbrueckii UFV H2b20 remained stable and viable for 28 days under refrigerated storage conditions. After one day of storage, that strain exhibited a one-log population reduction following exposure in tandem to simulated gastric and intestinal juices. After 14 days of storage, a two-log reduction was observed following 90 min of exposure to the simulated gastric conditions. However, the strain did not survive following exposure to the simulated intestinal juice. The observed tolerance to storage conditions and resistance to the simulated gastric and intestinal conditions confirm the potential use of L. delbrueckii UFV H2b20 as a probiotic, which is further reinforced by the detection of fbpA in this strain.

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