scholarly journals Windfield related light-trap catches of Nephotettix spp. (N. virescens Distant and N. nigropictus stål), vectors of rice tungro virus in West Bengal

MAUSAM ◽  
2021 ◽  
Vol 48 (1) ◽  
pp. 83-88
Author(s):  
SUJATA MUKHOPADHYAY ◽  
S. MUKHOPADHYAY
Keyword(s):  
Trajectory Analysis ◽  
West Bengal ◽  
Light Trap ◽  
Trapping Site ◽  
North East ◽  
The North ◽  
Trap Catches ◽  
High Catch ◽  
Very High ◽  
Overcast Sky

ABSTRACT. Regular peak catches of rice green leafhoppers, Nephoteltix virescens (Distant) and N. nigropictus (Stal) are usually obtained in a light-trap 60 ± 14 days after the peak monsoon rains in August in West Bengal. In 1986, in addition to this peak catch, very high catches were obtained on two different dates, 17 September and 10 November. The high catch on 17 September was probably due to the increase of the effective trap radius caused by the overcast sky and by the presence of a resident population. The high catch on 10 November was due to the transport of the insects by cyclonic winds and deposition in a zone of light and variable winds (at a convergence) real the trapping site. Trajectory analysis indicates that these insects may have been brought from the north-east, upto about 280 km away from the trapping site.      

Light-trap catches of African armyworm moths, Spodoptera exempta (Walker) (Lepidoptera: Noctuidae), in relation to rain and wind

1983 ◽  
Vol 73 (2) ◽  
pp. 315-319 ◽  
Author(s):  
M. R. Tucker
Keyword(s):  
East Africa ◽  
Light Trap ◽  
Spodoptera Exempta ◽  
Trap Catch ◽  
Early Season ◽  
African Armyworm ◽  
Light Wind ◽  
Trap Catches ◽  
Lepidoptera Noctuidae ◽  
Very High

AbstractThe association between weather and light-trap catches of Spodoptera exempta (Wlk.) was examined for four traps in East Africa, using whole–night catches and several years' data. Large increases in trap catch were found to be (1) significantly associated with rain at all four traps for the period December–March, but not for later in the season; (2) significantly associated with light wind periods at Muguga for December–May, but not later in the year, and not at Nakuru, due to the very high overall frequency of light winds there; and (3) not significantly associated with windshifts at either Muguga or Nakuru. These results suggest that high densities of flying moths, which may give rise to caterpillar outbreaks early in the year, often occur where the rather infrequent early–season rains fall.

scholarly journals COMPARAISON DES RESULTATS DE L’APPROCHE PAP/CAR ET LE MODELE USLE DANS LA CARTOGRAPHIE ET L’ESTIMATION QUALITATIVE DE L’EROSION HYDRIQUE DANS LE BASSIN VERSANT DE L’OUED AMLIL, (PRERIF - MAROC).

2021 ◽  
Author(s):  
Hili Aiman ◽  
Yahia El Khalki ◽  
Hanane Reddad ◽  
Jaouad Gartet ◽  
Mohamed Abahrour
Keyword(s):  
Action Plan ◽  
Water Erosion ◽  
Intense Rainfall ◽  
North West ◽  
North East ◽  
The North ◽  
Basin Scale ◽  
Natural Data ◽  
Bassin Versant ◽  
Very High

Este trabajo presenta los resultados de nuestro estudio sobre la cartografía y la estimación de la erosión del agua utilizando dos tipos de métodos. El primero es el del PAP/RAC 1998 que actúa en el marco del Plan de Acción para el Mediterráneo (PAM) del PNUMA, el segundo es el del modelo empírico de WISCHMEIER y SMITH 1978 (USLE).En la cuenca del Oued Amlil (153,7 km²) situada al noroeste de Taza (noreste de Marruecos) se dan todas las condiciones para que se desencadene y se acelere la erosión hídrica, las formaciones litológicas margosas blandas e impermeables (71,5%), una cobertura vegetal muy limitada (13,2%) y unas precipitaciones agresivas e intensas. El análisis de los datos naturales de la cuenca por el método PAP/CAR ha identificado cinco tipos principales de erosión (erosión muy alta 23%, erosión alta 48%, la clase de erosión significativa representa el 22%, 6% y 1% para las clases de erosión baja y muy baja respectivamente. Luego, las pérdidas de suelo fueron estimadas por el método USLE, los resultados obtenidos permiten identificar sectores a escala de cuenca donde las pérdidas tienen valores altos de 62.3% (alto riesgo entre 66 y 102 t/ha/año (34%), y muy altos (26.2%) entre 102 y 355.6 t/ha/año) This work presents the results of our study on mapping and estimating water erosion using two types of methods. The first is that of PAP/RAC 1998 acting within the framework of the UNEP Mediterranean Action Plan (MAP), the second is that of the empirical model of WISCHMEIER and SMITH 1978 (USLE). In the catchment area of the Oued Amlil (153.7 km²) located to the North-West of Taza (North-East Morocco), all the conditions for triggering and accelerating water erosion are present, soft and impermeable marl lithological formations (71.5%), very limited vegetation cover (13.2%), and aggressive and intense rainfall. The analysis of the natural data of the watershed by the PAP/CAR method has identified five main types of erosion (very high erosion 23%, high erosion 48%, notable erosion class represents 22%, 6% and 1% for low and very low erosion classes respectively. Then, soil losses were estimated by the USLE method, the results obtained allow the identification of sectors at the basin scale where the losses have high values 62.3% (high risk between 66 and 102 t/ha/year (34%), and very high (26.2%) between 102 and 355.6 t/ha/year). Le présent travail expose les résultats de notre étude concernant la cartographie et l’estimation de l’érosion hydrique selon deux types de méthodes. La première, est celle de PAP/CAR 1998 agisse dans le cadre du Plan d'action pour la Méditerranée (PAM) du PNUE, la seconde est celle du modèle empirique de WISCHMEIER et SMITH 1978 (USLE). Dans le bassin versant de l’Oued Amlil (153.7 km²) situé au Nord-Ouest de Taza (Nord-Est du Maroc), toutes les conditions de déclenchement et d’accélération de l’érosion hydrique sont présentent, des formations lithologiques marneuses tendres et imperméables (71.5%), un couvert végétal très limité (13.2%), et des précipitations agressives et intenses. L'analyse des données naturelles du bassin versant par la méthode de PAP/CAR a permis d’identifier cinq principaux types d’érosion (érosion très élevée 23%, 48% pour l’érosion élevée, la classe d’érosion notable représente 22%, 6% et 1% pour les classes d’érosion faibles et très faible respectivement. Ensuite, les pertes en sol ont été estimées par la méthode d’USLE, les résultats obtenus permettent l’identification des secteurs à l’échelle du bassin où les pertes connaissent des valeurs élevées 62.3% (risque forte entre 66 et 102 t/ha/an (34%), et très fort (26.2%) entre 102 et 355.6 t/ha/an).

The nocturnal migration of the Australian plague locust, Chortoicetes terminifera (Walker) (Orthoptera: Acrididae): quantitative radar observations of a series of northward flights

1983 ◽  
Vol 73 (4) ◽  
pp. 567-585 ◽  
Author(s):  
V. A. Drake ◽  
R. A. Farrow
Keyword(s):  
Extreme Values ◽  
Light Trap ◽  
Surface Boundary ◽  
Surface Boundary Layer ◽  
Radar Observations ◽  
The North ◽  
South Wales ◽  
Radar Echo ◽  
And Migration ◽  
Trap Catches

AbstractNight migrations of insects above the surface boundary layer were studied by direct observations with an entomological radar, and by direct aerial sampling with a kite-borne net, in an area in New South Wales inhabited by large fledging populations of Chortoicetes terminifera (Wlk.). The aerial catches and radar echo-modulation observations suggested that the majority of migrants detected by the radar were locusts, and this conclusion was supported indirectly by light-trap catches and by observations of take–off at dusk. Night flights of locusts began at dusk with a mass take-off and continued on a diminishing scale until about midnight. Displacements were all approximately downwind and to the north, under the influence of a southerly airflow which prevailed throughout the six-day study period. A quantitative radar observation procedure was used to estimate locust aerial densities and migration rates, and to observe the variations of these quantities with height and time; typical and extreme values for all the principal migration quantities are presented. The flight paths of the locusts were estimated from radar observations of target tracks, and probable source areas at distances of up to 200 km to the south were identified; a major overflight which probably originated 150 km away was detected on one occasion. Northward movements of C. terminifera during anticyclonic conditions may help to explain how populations are redistributed in the periods between the long-range southward invasion movements for which this species is well-known.

Post-memory and the third generation’s inheritance of the Indian partition (1947): A comparative study of the linguistic register across spatial axes

2021 ◽  
pp. 175069802110333
Author(s):  
Avishek Ray
Keyword(s):  
Comparative Study ◽  
West Bengal ◽  
Western India ◽  
Growing Up ◽  
The West ◽  
North East India ◽  
The Third ◽  
North East ◽  
The North ◽  
The Difference

The experience of the Partition (1947)—the contexts of migration and the experience of refugeehood—in East-India is assumed to be different from that in the West. But, even after some 70 years after the Partition, there has been no substantial study on the difference in the ontology of refugeehood across the two sites. More to it, narratives from the North-east (Meghalaya, Assam, Tripura), which again differ significantly from their western Indian or West Bengali counterparts, are under-represented in the existing database of oral narratives and ethnographies on the Partition. Departing from here, this paper engages in a critical comparative study—across three spatial axes: western India, West Bengal, and North-east India—of the third generation’s experience of “growing up refugee” in India. It offers a nuanced, but empirically-grounded, insight on how memories and narratives of the Partition are grounded in the linguistic registers of those who “grew up refugee” (not the refugees per se). Based on interviews, this paper analyzes the patterns, circulations, transactions, tropes, and motifs in the linguistic registers using methodologies of Digital Humanities, and how they compare across spatial axes.

scholarly journals Origin and Diffusion of the Myotonic Dystrophy Gene in the Saguenay Region (Quebec)

1989 ◽  
Vol 16 (1) ◽  
pp. 119-122 ◽  
Author(s):  
Gérard Bouchard ◽  
Raymond Roy ◽  
Manon Declos ◽  
Jean Mathieu ◽  
Kevork Kouladjian
Keyword(s):  
Myotonic Dystrophy ◽  
North East ◽  
The North ◽  
Demographic Behavior ◽  
High Prevalence ◽  
Regional Population ◽  
The Subject ◽  
High Degree ◽  
And Diffusion ◽  
Very High

ABSTRACT:A very high prevalence (approximately 1/475 in 1985) of myotonic dystrophy (Steinert disease) is observed in the Saguenay region, which is located in the north-east part of the Province of Quebec. For various reasons, however, the literature on the subject generally associates a high degree of selective disadvantage with this gene, which seems to contradict the Saguenay data. Using a computerized regional population register, we have reconstituted patients' genealogies and family biographies. We have thus been able to study the origin of the gene and to compare the demographic behavior of patients and controls. On the whole, patients seem to be very little disadvantaged compared to controls, in terms of reproduction as well as of geographical and occupational mobility.

A ‘Romano-Celtic’ Temple near Harlow, Essex; and a note on the type

1928 ◽  
Vol 8 (3) ◽  
pp. 300-326 ◽  
Author(s):  
R. E. M. Wheeler
Keyword(s):  
Fourth Century ◽  
The Other ◽  
General Character ◽  
Railway Station ◽  
Ordnance Survey ◽  
South Eastern ◽  
North East ◽  
The North ◽  
Roman Coins ◽  
Very High

About two hundred and fifty yards west of Harlow railway-station, in the Essex border-parish of Latton (Ordnance Survey 6-in. map, XLI, NW.), a small gravel-capped oval hill known as Stanegrove or Standing Groves rises to a height of some 20 ft. above the marshy banks of the river Stort. In 1764 and again in 1819 ‘very strong walls’ were observed here; and other foundations ‘evidently Roman’, tesserae, many other Roman relics, and a stone coffin are recorded to have been discovered in the fields extending for a mile to the north-east, more particularly during excavations for gravel within 250 yards of the mound itself. Coffins thought to be of Roman date were found also near the station when the railway was built in 1841 and were re-buried in the station-yard. Amongst the finds from the area are specially noted ‘a great number of Roman coins chiefly of Emperors from the first Claudius to Valentinian’, including ‘several silver pieces of Sabina, Faustina the Elder, and Constantinus Junior’, and a few British, of which the following are specified: (1) one with a helmeted head, with CUNOBELINA; reverse, a hog and TASCHOVANIT (sic); (2) another ‘with a head on one side; on the other a man striking upon an anvil; (3) ‘one with a star, between the rays of which are the letters VERLAMIO; reverse, an ox’. The general character of the evidence closely resembles that obtained from similar riverside gravels in many parts of south-eastern Britain, and indicates a fairly extensive and continuous occupation, perhaps not of a very high order, from later prehistoric times to the last quarter of the fourth century.

scholarly journals Assessing soil loss using GIS based RUSLE methodology. Case of the Bou Namoussa watershed – North-East of Algeria

2018 ◽  
Vol 36 (1) ◽  
pp. 27-35 ◽  
Author(s):  
Chemss Eddine Bouhadeb ◽  
Mohamed Redha Menani ◽  
Hamza Bouguerra ◽  
Oussama Derdous
Keyword(s):  
Vegetation Cover ◽  
Soil Loss ◽  
Erosion Rate ◽  
Geographical Information ◽  
Rainfall Erosivity ◽  
Natural Environments ◽  
North East ◽  
The North ◽  
Soil Erosion Rate ◽  
Very High

AbstractThis study aims to estimating annual soil erosion rate and its spatial distribution in the Bou Namoussa water-shed located in the North-East of Algeria by applying the revised universal soil loss equation (RUSLE) within a Geographical Information System environment (GIS). The application of the RUSLE model in different natural environments and on every scale takes into account five key factors namely: the rainfall erosivity, the soil erodibility, the steepness and length of slopes, the vegetation cover and the conservation support practices. Each of these factors was generated in GIS as a raster layer, their combination, resulted in the development of a soil loss map indicating an average erosion rate of 7.8 t·ha−1·y−1. The obtained soil loss map was classified into four erosion severity classes; low, moderate, high and very high severity representing respectively 40, 30.48, 22.59 and 6.89% of the total surface. The areas, showing moderate, high and very high erosion rates which represent more than half of the basin area were found generally located in regions having high erodibility soils, steep slopes and low vegetation cover. These areas should be considered as priorities in future erosion control programs in order to decrease the siltation rate in the Cheffia reservoir.

Indian opposition parties will find it tough to unite

2021 ◽  
Keyword(s):  
West Bengal ◽  
Prime Minister ◽  
General Election ◽  
Content Type ◽  
North East ◽  
The North ◽  
Bharatiya Janata Party ◽  
Opposition Parties

Significance The dialogue centred on how to work more cooperatively to challenge Prime Minister Narendra Modi’s government ahead of the next general election, due in 2024. The National Democratic Alliance, led by Modi’s Bharatiya Janata Party (BJP), had landslide wins in the 2014 and 2019 polls. Impacts The BJP will try to destabilise rival parties by encouraging their lawmakers to quit them. West Bengal state’s ruling All India Trinamool Congress, a major BJP opponent, will become more influential in the north-east. Muslims may feel increasingly vulnerable to verbal and physical attacks.

Ras al Khaimah: further archaeological discoveries

Antiquity ◽  
1976 ◽  
Vol 50 (200) ◽  
pp. 216-222
Author(s):  
Beatrice De Cardi
Keyword(s):  
United Arab Emirates ◽  
The State ◽  
Focused Attention ◽  
North East ◽  
The North ◽  
History Of ◽  
The City

Ras a1 Khaimah is the most northerly of the seven states comprising the United Arab Emirates and its Ruler, H. H. Sheikh Saqr bin Mohammad al-Qasimi, is keenly interested in the history of the state and its people. Survey carried out there jointly with Dr D. B. Doe in 1968 had focused attention on the site of JuIfar which lies just north of the present town of Ras a1 Khaimah (de Cardi, 1971, 230-2). Julfar was in existence in Abbasid times and its importance as an entrep6t during the sixteenth and seventeenth centuries-the Portuguese Period-is reflected by the quantity and variety of imported wares to be found among the ruins of the city. Most of the sites discovered during the survey dated from that period but a group of cairns near Ghalilah and some long gabled graves in the Shimal area to the north-east of the date-groves behind Ras a1 Khaimah (map, FIG. I) clearly represented a more distant past.

Lichens in the North-East regions of Cyprus

1999 ◽  
Vol 110 (5-6) ◽  
pp. 455-463 ◽  
Author(s):  
S. Güvenç ◽  
Ş Öztürk
Keyword(s):  
North East ◽  
The North
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