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Agora USB ; 12(2): 473-495, jul.-dic. 2012.
Article in Spanish | LILACS | ID: lil-703259


Este artículo de investigación pretende brindar elementos de análisis sobre el complejo tema de la colonización de la naturaleza. En él se hace una argumentación descriptiva basada hallazgos teóricos sobre las relaciones entre el extractivismo, una práctica propia del dispositivo colonial, y lo que aquí denominamos colonización de la naturaleza. El artículo presenta inicialmente un balance del impacto en la configuración de la visión-apropiación ancestral del territorio y su contenido cultural, a raíz de la imposición de una nueva semántica, en referencia al dispositivo de poder colonial. Luego, se analiza la relación del extractivismo con el proceso de colonización de la naturaleza, para finalmente esbozar una reflexión breve vinculando contextos y problemas contemporáneos.

This research paper aims at providing some elements of analysis on the complex issue of the colonization of nature. In it a descriptive argument is carried out based on theoretical findings on the relationships between extractivism, which is a proper practice of the colonial device, and what is here called colonization of nature. The article initially presents an assessment of the impact on the configuration of the ancestral vision and appropriation of the territory and its cultural contents, as a result of the imposition of a new semantics, in reference to the device of the colonial powers. Then, the relationship between extractivism and the process of colonization of nature is analyzed; to finally sketch a brief reflection, by linking contemporary issues and contexts.

Humans , Ecology/classification , Ecology/education , Ecology/history , Ecology/statistics & numerical data , Ecology/ethics , Ecology/instrumentation , Ecology/legislation & jurisprudence , Ecology/methods , Ecology/standards , Ecology/organization & administration , Ecology
Assiut University Bulletin for Environmental Researches. 2012; 15 (2): 51-61
in English, Arabic | IMEMR | ID: emr-154226


The present study was carried out in Assiut area to investigate the relationship between cereal aphids and their associated parasitoids on wheat plants during two successive seasons, 2011 and 2012. The results indicated that of 48,000 mummified aphids collected from wheat plants in two seasons, 89.69% adult parasitoids were emerged. Ten parasitoid species belonging to five families of order hymenoptera were identified. The primary parasitoid species were recorded, Aphidius colemani Vereck, A. matricariae Haliday, Diaeretiella rapae [Mclntosh], ffptiedrus plagjfator[Ness], Praon necans Mackauer and Trioxyssy., in addition the secondary parasitoids were, AUoxysta Australia [AsbmQandA], Dendrocerus carpenter [Cuitis], Chalclds sp.,and Aphidencyrtus sp. Data show that, Diaeretiella rapae was the most dominant and abundant primary parasitoid species represented 87.99% and 64.35% during 2011 and 2012 seasons, respectively. In spite of aphids, five aphid species namely, Scbhaphis grawinumfiwfaw, Rbopaloslphum pad! L, R. maldls [Fitch.], Sitobion avenae [Fab.] and Metopolophium dlrbodum [Walker] were found attacking wheat plants in Assiut region. Rbopaloslpbum padl and Schizaphls gramlnum were the most dominant and abundant cereal aphids on wheat plants represented [55.55 and 54.41%] and [40.68 and 43.11%] in both two species during 2011 and 2012 seasons, respectively. The maximum population level of cereal aphids was recorded during the 1[st] wk of March [529.0 and 729.0] during the two seasons, respectively. The parasitoids appeared early in the season in relatively low population density but its population fluctuated in high density during the 2nd wk of March [408.0 and 335.6] in 2011 and 2012 seasons, respectively, coincided with the collapse of aphids from wheat field. This work indicated that wheat fields are rich in aphid parasitoid species which of course play a significant role in suppressing aphid infestations

Aphids/growth & development , Ecology/instrumentation
Assiut University Bulletin for Environmental Researches. 2012; 15 (2): 63-81
in English, Arabic | IMEMR | ID: emr-154227


Toor Al-Baha of Lahej governorate [Yemen] lies between latitudes 12° 58 -13° 20 N, and longitudes 44° 11 - 44° 39 E, has been studied floristically. This region covers about 1883 sq ion. Analysis of the floristic composion of the studied area have been carried out and proved that, about 560 taxa belong to 288 genera and 89 families of the vascular plants have been recorded. Of these, the largest families are: Poaceae, Asteraceae, Asclepiadaceae, Euphorbiaceae, Fabaceae, Acanthaceae, Capparaceae, Lamiaceae, Boraginaceae, Malvaceae, Solanaceae, Mimosaceae, Tiliaceae, Amaranthaceae, Cucurbitaceae, Gonvolvulaceae and Scrophulariaceae, while the largest genera are: Euphorbia, Acacia, Grewia, Heliotropium, Indigofera, Barleria, Eragrostis, Aloe, Hibiscus, Solanum, Tepbrosia, Cadaba, Crenulluma, Ficus, Justicla, and Senna. It was also noted that the generic index - 1.94. Sixty eight succulents taxa belong to eighteen families were recorded in the flora of the studied area, among these families six are the richest ones: Asclepiadaceae, Euphorbiaceae, Aloaceae, Aizoaceae, Crassuiaceae and Vitaceae. Twenty eight taxa are endemic to flora of Yemen, among them Rhytidocaulon splendidum T. A. McCoy is endemic to Toor Al-Baha only. Another thirty four taxa are found to be near endemic to the flora of Yemen

/adverse effects , Fabaceae/adverse effects , /adverse effects , Solanaceae , /adverse effects , Acacia/adverse effects , Ecology/instrumentation , Ecology
Article in Portuguese | LILACS | ID: lil-459156


Neste estudo foi analisada a riqueza, a abundância, os sítios de nidificação, o padrão de distribuição espacial, a densidade dos sítios potenciais disponíveis e dos sítios nidificados pelas espécies de abelhas sem ferrão do gênero Partamona e dos termiteiros arbóreos nidificados pelas abelhas, em uma área restrita de caatinga arbórea, em Milagres, Bahia, Brasil. Duas espécies ocorreram em simpatria, Partamona rustica (94,1 por cento) e Partamona cupira (5,9 por cento), ambas nidificando em termiteiros arbóreos da espécie Constrictotermes cyphergaster. Outras três espécies de termiteiros arbóreos ocorreram na área (Nasutitermes corniger, Nasutitermes macrocephalus e Microcerotermes sp.). Os térmitas arbóreos nidificaram principalmente na umburana (Commiphora leptophloeos). As espécies de abelhas do gênero Partamona têm como estratégia de nidificação na caatinga utilizar cavidades pré-existentes que consistem em ocos abertos em termiteiros arbóreos pelo periquito jandaia (Aratinga cactorum), para reprodução. Após o nascimento dos filhotes, o oco é abandonado e em seguida uma colônia de abelhas do gênero Partamona constrói ali o seu ninho, ocupando-o e isolando-o com geoprópolis, sendo freqüente a ocupação destes ocos por outros inquilinos.

The species richness, abundance, nesting sites, spatial distribution pattern, density of available substrates and substrates used for nesting by Partamona species were studied in a restricted area of a tropical dry forest/woodlands ecosystem called "arboreal caatinga" in Milagres, Bahia State, Brazil. Two species of the genus Partamona, occurred in the studied area, Partamona rustica (94.1 percent) and Partamona cupira (5.9 percent), both nested in arboreal termites nests of the Constrictotermes cyphergaster species. Other three species of arboreal termites' nests occurred in the area (Nasutitermes corniger, Nasutitermes macrocephalus and Microcerotermes sp.). The arboreal termites had nested mainly in "umburana" (Commiphora lepthophloeos). The nesting strategy of Partamona species consist in occupying preexisting cavities opened in arboreal termites nested by a parakeet called "jandaia" (Aratinga cactorum), for reproduction. After the birth of the younglings, the cavity is abandoned and after that a colony of Partamona bees occupies it and starts its nest construction, isolating it with mud and resin. Frequently these cavities are occupied by other inquilines.

Bees/classification , Biodiversity , Ecology/classification , Ecology/instrumentation , Flora/analysis , Reproduction , Trees