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Note sur quelques insectes récoltés au piège Malaise en Guyane française
Abstract
Nous présentons ici les premiers résultats d'un travail de collecte, à l'aide de pièges Malaise, d'insectes de Guyane française. Trois régions ont été investiguées: la région de la Basse-Mana, la région de Saint-Laurent-du-Maroni et les MOntagnes de Kaw. Les résultats présentés mettent l'accent sur les Hyménoptères présents sauf pour la région de la Basse-Mana où d'autres ordres ont été pris en compte. La faune observées, telle que nous la révèlent ces derniers résultats, comporte surtout des espèces communes. Toutefois, pour la première fois, nous pouvons signalés la présence en Guyane de Epsilogaster panama Whitfield & Mason, 1994 (Braconidae) Monomachus ?glaberrimus Schletterer, 1890 (Monomachidae), Mysticagenia sp.n. (Pompilidae), Rhopalosoma guianenses Schulz, 1906 et Olixon testaceum Cameron, 1887 (Rhopalosomatidae), Clystopsenella longiventris Kieffer, 1911 (Scolebythidae).
... In general, the use of several capture methods is necessary for inventory of species with diverse life histories such as beetles, which constitute the largest insect order ( Lhoir et al., 2003). Braet et al. (2000) recommended that insects in tropical environments would be more effectively inventoried with combined use of different trapping methods. So far, investigation on beetles using several methods of capture has not been conducted in Ivory Coast. ...
... The pitfall traps are suitable for collecting ground-dwelling beetles. The complementary abilities of different traps to collect different insects make it necessary to use them in combination with others for faunal inventories ( Braet et al., 2000). . ...
Different methods of trapping for insect biodiversity related investigations are recommended, depending on the biological group studied. The aim of this study was to compare the efficiency of four trapping methods in capturing beetles in relation to habitat.
The methods were: (1) yellow ground traps, (2) yellow aerial traps, (3) Malaise traps and (4) pitfall traps. We collected samples in 8 land use types: (i) primary forests (PF), (ii) secondary forests (SF), (iii) multi-species plantations (MP), (iv) 10-year-old teak plantations (TK10), (v) 4-year-old teak plantations (TK4), (vi) rural fallows (FA), (vii) mixed-crop fields (MC) and (viii) cocoa plantations (CC). We used 31 traps/site: 10 pitfall traps, 10 yellow ground traps, 9 yellow aerial traps and 2 Malaise traps. The traps captured 2195 specimens of Coleoptera (Malaise traps - 787 specimens, pitfall traps - 406 specimens, yellow aerial traps - 487 specimens, and yellow ground traps – 515 specimens). The Malaise and pitfall traps collected the highest number of specimens in mixed-crop fields. The yellow ground traps and yellow aerial traps collected the highest number of specimens in cocoa plantations
and in primary forests. Beetle abundance and diversity varied according to the trap and the land use type. Although Malaise traps collected more families and individuals, combining different traps is recommended for the best sampling of Coleopteran taxa.
... The yellow ground traps allowed detection of greater differences among beetle abundances in the different agroecosystems. Generally, the capture methods do not have the same capacity for collecting insects, and therefore insect studies in tropical habitats would benefit from the application of different trapping systems (Braet et al. 2000). ...
Comparing beetle abundance and diversity values along a land use gradient in tropical Africa (Oumé, Ivory Coast). Zoological Studies 47(4): 429-437. Beetles are an important part of global biodiversity, and they contribute to most ecological processes that sustain various ecosystems. Their natural habitats are often influenced by human agricultural activities. In the context of the sustainable use of natural resources in tropical countries, an investigation was conducted in Ivory Coast to study the influence of habitat modification on beetles. A stratified sampling method was utilized. The aim of this work was to study beetle distribution, abundance, and diversity in agroecosystems along a land degradation gradient. This research demonstrated that beetle abundance and diversity values varied depending on land characteristics. Mixed-crop fields supported the most abundant and diverse beetle community. Beetle distribution and diversity are clearly affected by land transformation.
Vespoidea are the most functionally diverse superfamily of Hymenoptera. Ecological studies involving this family are primarily based on eusocial groups, including ants and social paper wasps. In the present study, we examine stinging wasp (Vespoidea) faunal diversity in the Atlantic Rain Forest, which is one of the most diverse and threatened ecosystems in the World. Three conservation areas were sampled employing a standardized sample protocol. Families and functional groups of Vespoidea were collected in each area, with the exception ants (Formicidae), and analyzed using diversity analyses, to generate taxonomic diversity and distinctness indices. Results indicated Pompilidae was the most diverse family, and the idiobiont parasitoid type was the most diverse functional group in the three study areas. Núcleo Picinguaba of the Parque Estadual da Serra do Mar was taxonomically and functionally the most diverse and species rich area. Parque Estadual Intervales showed the highest number of dominant species and diversity of koinobiont parasitoids, while the Rebio Sooretama exhibited a decrease in several diversity parameters.
The New World species of the brachypterous wasp genus Olixon Cameron are revised and five species are recognized: Olixon atlanticum Fernandez & Sarmiento-M., O. banksii (Brues), O. bicolor Roig Alsina & Martínez, O. melinsula sp. n. and O. testaceum Cameron. The new species and the previously unknown female of O. bicolor are described. An identification key and a distribution map for the New World Olixon are provided. The genus Olixon is more widely distributed throughout the New World than previously thought and here newly recorded from Belize, Bolivia, Canada, Ecuador, Guatemala, Paraguay, Peru, Suriname, Trinidad and Tobago and Venezuela.
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