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Search Results: 1 - 10 of 6982 matches for " population fluctuation "
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Influência climática e antrópica na abundancia e riqueza de Calliphoridae (Diptera) em fragmento florestal da Reserva Biológica do Tinguá, RJ
Ferraz, Adriana C P;Gadelha, Bárbara Q;Aguiar-Coelho, Valéria M;
Neotropical Entomology , 2010, DOI: 10.1590/S1519-566X2010000400004
Abstract: monthly collections were made using two traps 5 m apart exposed for 48h, containing sardines and installed at points: a at the edge (500 m from the entrance of the reserve); b 1200 m from the entrance and 1000 m inside the forest; and c 1700 m from the entrance and 500 m inside the forest. the purpose was to evaluate the abundance and richness of calliphorid species as a function of the environmental conditions using pearson's correlation, compare the richness of the areas using anova and tukey's test, compare the abundances of the areas by the kruskal-wallis test, and also assess the possible influence of the anthropic presence. rare, intermediary and common species were identified. the collection totalized 8515 calliphoridae belonging to 26 species, with a predominance of females. none of the 13 species considered common presented a correlation between abundance and temperature: only cochliomyia hominivorax (coquerel) and chrysomya megacephala (fabricius) were correlated with humidity and only mesembrinella semihyalina mello with precipitation. this parameter was the only climatic variable correlated with richness. the greatest abundance and richness of calliphorids occurred in september 2006. from the 13 common species, seven were considered synanthropic, indicating the effect of anthropic action in this site.
Abundancia e flutua??o populacional das espécies de Chrysomya (Diptera, Calliphoridae) em Pelotas, Rio Grande do Sul, Brasil
Vianna, élvia E. S.;Costa, Paulo R. P.;Fernandes, Ana Lúcia;Ribeiro, Paulo B.;
Iheringia. Série Zoologia , 2004, DOI: 10.1590/S0073-47212004000300002
Abstract: to estimate the populational fluctuation of chrysomya robineau-desvoidy, 1830 species and the relation of populational abundance around, six wind oriented trap (wot) were placed in three distinct ecological areas (urban, rural and wild) in pelotas, rio grande do sul, brazil, from february/1993 to january/1995. the flies were weekly collected. captured species were chrysomya albiceps wiedmann, 1819, c. megacephala fabricius, 1794 and c. putoria wiedmann, 1830 with respective abundance of 64.5%, 19.7% and 0.9%, representing a total of 85.0% of 409,920 specimens of calliphoridae. the three species demonstrated similarity in the populational fluctuation, except in the abundance. the populational peak ocurred in autum when the temperature decreases. in the months of july to november no fly was collected, recomposing the population in december, when the temperature surpassed 20oc.
Collection of Coleoptera from a poultry farm in Pelotas, Rio Grande do Sul, Brazil
Pinto, Diego Moscarelli;Duarte, Juliano Lessa Pinto;Ribeiro, Paulo Bretanha;Silveira Júnior, Paulo;
Ciência Rural , 2009, DOI: 10.1590/S0103-84782008005000060
Abstract: to evaluate the population fluctuation of coleoptera from a poultry farm in pelotas, rio grande do sul, brazil, two sampling methods were used: a tube-type trap and a sandwich trap. the analyses of polynomial regression were applied independent of the type of sampling method used. the experiment was carried out for twelve months, from april 2002 to march 2003, in a broiler barn aviary at the conjunto agrotécnico visconde da gra?a/ufpel. a total of 43.945 coleopterans were captured from the following species: alphitobius diaperinus, carcinops troglodytes, euspilotus rubriculus, gnathocerus cornutus, mezium americanum and somotrichus unifasciatus. among these, alphitobius diaperinus was present in all months of the year, with larval population peak in february (235) and lowest capture in august (01). the adult population peak was in march (12,020) and the lowest capture in july (27). the remaining captured coleopterans did not occur in all twelve months, however they also had population peaks in the months of february and march, which also were the months with the highest temperatures.
Dinamica populacional da mosca-negra-dos-citros Aleurocanthus woglumi ashby (hemiptera: aleyrodidae) em Citrus spp. no município de S?o Luís - MA
Medeiros, Fabíola Rodrigues;Lemos, Raimunda Nonata Santos de;Ottati, Angelo Luiz Tadeu;Araújo, José Ribamar Gusm?o;Machado, Keneson Klay Gon?alves;Rodrigues, Ant?nia Alice Costa;
Revista Brasileira de Fruticultura , 2009, DOI: 10.1590/S0100-29452009000400014
Abstract: this paper aims to evaluate the populational dynamics of aleurocanthus woglumi throughout one year, verifying the season with higher density, its populational peaks and citrus blackfly distribution in citrus spp. in two orchards, in s?o luís, maranh?o, brazil. to study the populational dynamics, 10 plants were selected at random, in each orchard, as well as 20 leaves per plant, from july 2006 to june 2007, and the number of layings, eggs and nymphs was counted. to determine the vertical distribution of a. woglumi, plants were divided into quadrants: north, east, south and west, and 5 leaves/quadrant were removed, totaling 200 leaves per collecting area. regarding to distribution over the plant, the delineation was entirely randomized adopting a 2 x 4 factorial scheme (dry and rainy seasons x quadrants), with 13 repetitions (number of collections). it accomplished an exploratory analysis of data and averages submitted to tukey test at a 5% probability rate. it was observed that on the two locations the insect was distributed homogeneous on the tree canopies and that the highest populational levels of a. woglumi occurred in the low precipitation season (from july to december 2006).
Concentra??o e tempo de libera??o do ferom?nio sexual sintético de Bonagota cranaodes (Meyrick) (Lepidoptera: Tortricidae) na cultura da macieira
Kovaleski, Adalecio;Botton, Marcos;Nakano, Octavio;Vilela, Evaldo F.;Eiras, álvaro E.;
Neotropical Entomology , 2003, DOI: 10.1590/S1519-566X2003000100006
Abstract: the effect of five dosis of the synthetic sex pheromone of bonagota (=phtheochroa) cranaodes (meyrick) (a 9:1 blend of e,z 3,5 dodecanyl acetate and z9 hexadecenyl acetate) and the duration of the synthetic pheromone under field conditions were evaluated in a commercial apple orchard in vacaria, rs, brazil. no significant differences were observed among concentrations ranging from 0.25 to 3.0 mg per rubber septum. delta traps baited with two virgin females were ca. four times more attractive than those baited with the synthetic sex pheromone at the dosis of 3 mg per septum. rubber septa containing this amount of synthetic sex pheromone remained attractive for 120 days. comparing number of males captured in traps baited with the synthetic pheromone and males captured in traps with virgin females during seven months, a significant and positive correlation is observed, demonstrating that the seasonal variations in b. cranaodes population density are detected using the synthetic sex pheromone in delta traps.
Flutua??o populacional circanual de coleópteros em granja avícola, em Pelotas, RS, Brasil
Bicho, Carla de Lima;Almeida, Lúcia Massutti de;Ribeiro, Paulo Bretanha;Silveira Júnior, Paulo;
Iheringia. Série Zoologia , 2005, DOI: 10.1590/S0073-47212005000200011
Abstract: the population fluctuation of coleoptera in poultry house "conjunto agrotécnico visconde da gra?a" in pelotas, rio grande do sul, brazil is investigated. six collection methods were utilized: 1 (0 to 7 day-old chicken feces); 2 (7 to 14 day-old feces); 3 (14 to 21 day-old feces); 4 (0 to 21 day-old feces), 5 (accumulated feces); and 6 (tube trap). an analysis of polynomial regression was accomplished independently of the collection methods. the survey was conducted from august 1998 to july 1999. a total of 12,449 coleoptera were collected, represented by the following species: carcinops troglodytes (paykull, 1811) (histeridae) (6,444); alphitobius diaperinus (panzer, 1797) (tenebrionidae) (2,896); somotrichus unifasciatus (dejean, 1792) (carabidae) (1,190); gnathocerus cornutus (fabricius, 1798) (tenebrionidae) (947); euxestus sp. (cerylonidae) (394); euspilotus rubriculus (marseul, 1855) (histeridae) (213); ontholestes sp. (staphylinidae) (190); dactylosternum sp. (hydrophilidae) (93); mezium americanum (laporte, 1840) (ptinidae) (43); palorus subdepressus (wollaston, 1864) (tenebrionidae) (27); tenebroides mauritanicus (l., 1758) (trogossitidae) (8); xyleborus ferrugineus (fabricius, 1801) (scolytidae) (1); and unidentified specimens of dermestidae (3). the highest number of species was collected during march and july, and the smallest in september. the highest abundance was recorded in march (2,159), while the lowest index of capture was noted in october (633). the population fluctuation was estimated for c. troglodytes, a. diaperinus, s. unifasciatus, g. cornutus, euxestus sp., e. rubriculus, ontholestes sp. and dactylosternum sp.
Complex interactions envolving a gall midge Myrciamyia maricaensis Maia (Diptera, Cecidomyiidae), phytophagous modifiers and parasitoids
Ferraz, Fernando Fortunato Faria;Monteiro, Ricardo Ferreira;
Revista Brasileira de Zoologia , 2003, DOI: 10.1590/S0101-81752003000300011
Abstract: myrciamyia maricaensis maia, 1995 (diptera, cecidomyiidae) induces a gall in lateral and apical shoots in the plant myrcia lundiana kiaersk (myrtaceae) which is used and modified by two eulophid wasps species. in both cases the gall former species suffer high rate of attack exceeding the importance of parasitoid species as mortality factors. in this study these interactions are described and their effects as mortality of gall former. the intensity of occurrence of the two eulophid species as modifiers and of microhymenopteran parasitoids, and the relative importance of these species as mortality agents of the m. maricaensis larvae is compared. this comparison reveals that two modifiers species found in the gall tissue modification causing the death of the m. maricaensis larva and it is a more important factor of mortality than the cecidomyiid larva parasitism. the fluctuation of the number of each type of gall along the year was monitored in the research field and confirmed in numerical and in synchronic terms of occurrence of the galls; the importance of the species of the gall modifier eulophids, particularly one of these species, as factors of mortality of the m. maricaensis larvae and justified our comparing the relationship between these species and m. maricaensis as similar to the parasitoid-host relationship. the gall shape modification by one of the eulophids allows the occurrence of other inquiline insect species, what means that this gall modification becomes it more heterogeneous and allows the increase of the species richness to the system.
Fauna de coleoptera coletada com armadilhas luminosas em plantio de Eucalyptus grandis em Santa Bárbara, Minas Gerais
Freitas, Fernando Azevedo de;Zanuncio, Teresinha Vinha;Lacerda, Mabio Chrisley;Zanuncio, José Cola;
Revista árvore , 2002, DOI: 10.1590/S0100-67622002000400014
Abstract: the objective of this research was to study population fluctuation of coleoptera species in the county of santa bárbara, minas gerais, brazil in a eucalyptus grandis plantation. coleoptera individuals were collected with five light traps during one night every fifteen days from july 1993 to june 1994. a total of 5,641 individuals of this order was collected, being 866 and 4,775 identified at genus and/or species and family levels, respectively. the family with the highest number of individuals was carabidae with 74.55%, followed by scarabaeidae and elateridae with 10.12% and 3.98% of individuals of this group, respectively. most species collected were isonychus albicinctus (scarabaeidae), followed by colaspis jolivetti (chrysomelidae) and cyclocephala laminata(scarabaeidae) with 412, 317 and 16 individuals which represented 54.50, 36.61 and 1.85% of individuals identified per species, respectively. the region of santa bárbara presents a diversified fauna of coleoptera, but with low outbreak possibilities. population peaks of coleoptera species ocurred in november and december, when monitoring of these insects is recommended.
Complex interactions envolving a gall midge Myrciamyia maricaensis Maia (Diptera, Cecidomyiidae), phytophagous modifiers and parasitoids
Ferraz Fernando Fortunato Faria,Monteiro Ricardo Ferreira
Revista Brasileira de Zoologia , 2003,
Abstract: Myrciamyia maricaensis Maia, 1995 (Diptera, Cecidomyiidae) induces a gall in lateral and apical shoots in the plant Myrcia lundiana Kiaersk (Myrtaceae) which is used and modified by two eulophid wasps species. In both cases the gall former species suffer high rate of attack exceeding the importance of parasitoid species as mortality factors. In this study these interactions are described and their effects as mortality of gall former. The intensity of occurrence of the two eulophid species as modifiers and of microhymenopteran parasitoids, and the relative importance of these species as mortality agents of the M. maricaensis larvae is compared. This comparison reveals that two modifiers species found in the gall tissue modification causing the death of the M. maricaensis larva and it is a more important factor of mortality than the cecidomyiid larva parasitism. The fluctuation of the number of each type of gall along the year was monitored in the research field and confirmed in numerical and in synchronic terms of occurrence of the galls; the importance of the species of the gall modifier eulophids, particularly one of these species, as factors of mortality of the M. maricaensis larvae and justified our comparing the relationship between these species and M. maricaensis as similar to the parasitoid-host relationship. The gall shape modification by one of the eulophids allows the occurrence of other inquiline insect species, what means that this gall modification becomes it more heterogeneous and allows the increase of the species richness to the system.
DINáMICA POBLACIONAL DE CALIROA CERASI L. (HYMENOPTERA: TENTHREDINIDAE) EN CULTIVOS DE CEREZO (PRUNUS AVIUM L.) DEL VALLE INFERIOR DEL RíO CHUBUT(REGIóN PATAGONIA SUR- ARGENTINA)
Bado,Silvina G;
Idesia (Arica) , 2010, DOI: 10.4067/S0718-34292010000300007
Abstract: caliroa cerasi, or "pear slug", causes important damages in cherry orchards of the lower valley of the chubut river. the principal aim of this work was to know their biology and poputation dynamic in this region, being these aspects basic to develop management strategies compatible with a pest integrated management programme. for this purpose, a scouting in three commercial orchards and in an experimental inta chubut plot during two consecutives growing seasons (2005/2006 y 2006/2007) was held. these consisted in the adults capture by chromatographic traps meanwhile in case of eggs and larvae, a direct sampling was done. in order to ajust sampling technics, during the second growing season, two stratum of the plant (lower and medium) were considered. population density was high in an organic production. population fluctuations indicate that the species present three generations annually in virch. significant differences in eggs levels between plant stratums were found only in two dates in an orchard conducted by a "central axis" system, but no in larvae case.
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