Preliminary data on the geographical distribution of Drosophila species within morphoclimatic domains of Brazil. III. The cardini group

Vilela, Carlos Ribeiro; Silva, Antônio Fernando Gouvêa da; Sene, Fábio de Melo

doi:10.1590/s0085-56262002000200006

Cited by 42 publications

(35 citation statements)

References 8 publications

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“…The high number of flies and the frequency of D. paranaensis contrast with the data of VILELA et al (1983) and TIDON-SKLORZ et al (1994), which showed that D. paranaensis is not commonly found in the different morphoclimatic domains.…”

Section: Resultscontrasting

confidence: 59%

Seasonal variation in natural populations of Drosophila spp. (Diptera) in two woodlands in the State of São Paulo, Brazil

Torres

Madi-Ravazzi

2006

Iheringia, Sér. Zool.

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ABSTRACT. The composition and the seasonality of the natural populations of Drosophila species in relation to the climatic variables temperature and rainfall were analyzed from September 1998 through October 1999 by monthly collections, in two woodlands in the Northwest of the State of São Paulo, Brazil. The diversity dominance component curves were inclined, reflecting low diversity and high dominance of few species. Among the 25 species recorded, Drosophila sturtevanti Duda, 1927 was the most frequent and abundant. On the opposite to data in literature, D. paranaensis Barros, 1950 abundance and frequency were greater than those from D. mercatorum Patterson & Wheeler, 1942. A positive correlation between abundance and rainfall was observed for D. nebulosa Sturtevant, 1916. These data are indicative of changes in the populations structure due to new adaptive strategies arised in response to environmental modifications. Populations are entities in a state of change. Even when the community and the ecosystem appear not to change, the density, mortality, survival, age distribution, growth rate and other attributes of the component populations generally fluctuate, as species adjust constantly to the seasons, physical forces and to each other. Consequently, it is much more revealing to discover in what way and how quickly a given population is changing than what its size and composition may be at a certain moment (ODUM, 1988). KEYWORDS.In the natural world, it is important to distinguish between seasonal changes in the size of a population, largely controlled by seasonal adaptations linked to environmental factors, and annual fluctuations. Annual fluctuations may be considered in two categories: those controlled principally by annual differences in extrinsic factors such as temperature and rainfall, which are beyond the sphere of population interactions, and intrinsic factors, oscillations controlled principally by population dynamics, like biotic factors, such as the availability of food or energy. In many cases, year-on-year changes in abundance appear to be clearly correlated to variation in one or more of the principle extrinsic limiting factors, but some species maintain such a regular relative abundance, apparently irrespective of obvious environmental factors, that the term "cycles" appears to be appropriate. Species that have such a regular variation in population size are often described as "cyclical". Populations modify and compensate for the perturbations of physical factors, thus, the more organized and mature the community, or the more stable the physical environment, or both, the less will be the amplitude of the fluctuations in population density over time (KREBS, 1985).According to BRNCIC et al. (1985) the seasonality of each species in the natural world is the result of a long and continuous process of adaptation to environmental conditions in which the species usually lives.Flies of the Drosophila genus are appropriate for the study of population fluctuation, as they are insects highly sensitive to ...

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Section: Resultscontrasting

confidence: 59%

Seasonal variation in natural populations of Drosophila spp. (Diptera) in two woodlands in the State of São Paulo, Brazil

Torres

Madi-Ravazzi

2006

Iheringia, Sér. Zool.

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“…In Brazil they have been collected from the Atlantic rain forest, as well as from forests in the states of São Paulo, Paraná, Mato Grosso do Sul, and Bahia (Vilela, 1983;Vilela et al, 1983;Tidon-Sklorz & Sene, 1992).…”

Section: The Fasciola Subgroupmentioning

confidence: 99%

Characterization of courtship sounds of species of the subgroup fasciola (Diptera, Drosophilidae, Drosophila repleta group): interspecific and interpopulational analyses

Costa

Sene

2002

Braz. J. Biol.

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The aim of this work was to characterize the male courtship song pattern of various species of the fasciola subgroup and to determine the level of variation both within and among species. The parameters analyzed were intrapulse interval (PI), interpulse interval (IPI), and intrapulse frequency (IF). Six different species were analyzed: D. coroica (three populations), D. ellisoni, D. fascioloides, D. moju, D. onca, and D. rosinae (one population each). There were significant differences among the six species for these three courtship song parameters. The IPI was the most variable parameter among these species, suggesting that this parameter is important for female discrimination. Four different hypotheses could explain this variation: 1. different selection pressures with absence of flow gene; 2. intraspecific sexual selection; 3. sympatric effects on song evolution; and 4. genetic drift. The PI was the only parameter that was significantly different among the three population of D. coroica. Low variability among populations within the same species was already observed for other subgroups and could be explained by the following hypotheses: strong selection acting on the song parameters, gene flow, or recent colonization from a common source. Additional studies of the courtship song of other species of the fasciola subgroup, as well as for other subgroups of the repleta group, and studies, using molecular makers, that focus on the genetic basis of the differences among these species in courtship song would allow us to evaluate the association of courtship song and sexual isolation in these species, and would also help us to understand the evolution of these behavioural differences.Key words: drosophila, fasciola subgroup, courtship song, evolution, behavior. 3. efeito de simpatria; e 4. deriva genética. As análises realizadas entre as 3 populações da espécie D. coroica mostraram diferenças estatísticas somente em relação ao PI. Essa baixa variabilidade entre populações de uma mesma espécie também já foi encontrada em outros subgrupos e pode ser explicada pelas seguintes hipóteses: forte seleção sobre os parâmetros sonoros, ocorrência de fluxo gênico entre as populações ou colonizações recentes a partir de um ancestral comum. Estudos da corte sonora de outras espécies do subgrupo fasciola e mesmo de espécies de outros subgrupos do grupo repleta, e também estudos relacionados à base genética das diferenças sonoras entre as espécies, utilizando marcadores moleculares, ajudariam a avaliar a relação dos parâmetros sonoros com o processo de isolamento sexual e também a entender a evolução dessas diferenças comportamentais. RESUMOPalavras-chave: drosophila, subgrupo fasciola, corte sonora, evolução, comportamento.

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“…These two species are sympatric throughout a large part of their range (Vilela, 1983). Whereas the other species of the repleta group are associated with cacti, D. mercatorum pararepleta and D. paranaensis are generalists that occur in diverse environments Vilela et al, 1983).…”

Section: Introductionmentioning

confidence: 99%

Wing shape heritability and morphological divergence of the sibling species Drosophila mercatorum and Drosophila paranaensis

et al. 2004

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The fruit-flies Drosophila paranaensis and Drosophila mercatorum pararepleta are sibling species belonging to the repleta group. Females of these two species are normally considered to be morphologically indistinguishable while males only differ consistently in the morphology of their genitalia. These species are sympatric throughout a large area of their geographic distribution. In this study, we investigated the degree of morphological divergence between D. paranaensis and D. mercatorum pararepleta based on morphometric analysis of their wings. The ellipse method was used to describe the placement of the longitudinal and transversal wing veins as well as the size of the wing and the shape of its outline. The heritability under laboratory and field conditions was also estimated from the parameters generated. Multivariate analysis showed that wing morphology possessed sufficient differences to discriminate between the two species with a successful classification rate of 95-98% for females and 82-87% for males. The results of the autoclassification were confirmed by a cross-validation test for females (92-96%). Most measurements possessed significant natural heritability (a mean of 0.48 for D. mercatorum and 0.88 for D. paranaensis), indicating that the variation observed was related to differences in genes acting additively. The principal difference between the two species was in the placement of the posterior transverse wing vein. However, the pattern of morphological variation in the wings of both species was similar, possibly because of shared restrictions in wing development pathways.

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Preliminary data on the geographical distribution of Drosophila species within morphoclimatic domains of Brazil. III. The cardini group

Cited by 42 publications

References 8 publications

Seasonal variation in natural populations of Drosophila spp. (Diptera) in two woodlands in the State of São Paulo, Brazil

Seasonal variation in natural populations of Drosophila spp. (Diptera) in two woodlands in the State of São Paulo, Brazil

Characterization of courtship sounds of species of the subgroup fasciola (Diptera, Drosophilidae, Drosophila repleta group): interspecific and interpopulational analyses

Wing shape heritability and morphological divergence of the sibling species Drosophila mercatorum and Drosophila paranaensis

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