Two ascomycetous yeast species, Candida flosculorum sp. nov. and Candida floris sp. nov., were isolated from tropical flowers and their associated insects. C. flosculorum was isolated from flower bracts of Heliconia velloziana and Heliconia episcopalis (Heliconiaceae) collected from two Atlantic rain forest sites in Brazil. C. floris was isolated from flowers of Ipomoea sp. (Convolvulaceae) growing on the banks of the river Paraguai in the pantanal ecosystem in Brazil and from an adult of the stingless bee Trigona sp. and a flower of Merremia quinquefolia (Convolvulaceae) in Costa Rica. C. flosculorum belongs to the Metschnikowiaceae clade and C. floris belongs to the Starmerella clade. The type strain of C. flosculorum is UFMG-JL13T (=CBS 10566T=NRRL Y-48258T) and the type strain of C. floris is UWO(PS) 00-226.2T (=CBS 10593T=NRRL Y-48255T).
RESUMO -Foram registradas, na Estação Ecológica da Universidade Federal de Minas Gerais (UFMG), espécies de moscas que visitam flores para se alimentar. Asteraceae, Rhamnaceae, e Boraginaceae foram as famílias mais visitadas. Asteraceae foi a mais rica em espécies floridas, sendo também a mais visitada por famílias e espécie de moscas. A diversidade mais elevada de visitantes ocorreu em Baccharis trinervis (Lam.) (H'=1.86). As famílias de moscas mais diversas foram Syrphidae (H' = 2,07) e Bombyliidae (H' = 1,52). Os sirfídeos Ornidia obesa (L.) e Palpada furcata (Wied.) foram as espécies mais abundantes entre as visitantes. A abundância total de visitantes foi significativamente maior na estação chuvosa, quando um número maior de plantas estavam florescendo. Entretanto, um maior número de famílias visitou plantas durante a estação seca. O número de fêmeas em quatro famílias de moscas foi ligeiramente mais elevado do que o número de machos. Calliphoridae e Sarcophagidae mostraram padrões similares com relação ao número de espécie de plantas visitadas. Syrphidae foi mais generalista mas, Bombyliidae e Stratiomyidae foram relativamente mais especializadas. Muita espécies de moscas visitam flores, por isso a abundância e frequência de visitas podem indicar sua importância como polinizadores, bem como a importância das flores em sua dieta. PALAVRAS-CHAVE: Insecta, Diptera, visitantes florais, riqueza de insetos, sazonalidade.ABSTRACT -The species of flies that visit flowers to feed were recorded, at the Ecological Station of the Federal University of Minas Gerais (UFMG). Asteraceae, Rhamnaceae, and Boraginaceae were the most visited families. Asteraceae was the richest family and the most visited by flies families and species. The highest diversity of visiting flies was on Baccharis trinervis (Lam.) (H'=1.86). The most diverse families of Diptera were Syrphidae (H'= 2.07) and Bombyliidae (H'= 1.52). The syrphids Ornidia obesa (L.) and Palpada furcata (Wied.) were the most abundant species amongst visitors. Despite the total abundance of Diptera was significantly higher in the rainy season, when a higher number of plants were blooming, there were more families of visitors during the dry season. The number of females in four families of flies was typically slightly higher than the number of males. Calliphoridae and Sarcophagidae showed similar patterns regarding the number of plant species visited, while Syrphidae were the most generalized, and Bombyliidae and Stratiomyidae visited few plant species. Many species of Diptera visit flowers, and their abundance on plants could indicate their importance as pollinators as well the importance of flowers for their diet.
The genusMerosargus(Loew) has 142 described species. This great diversity in the genus could be explained by larvae resource-use specialization. However, information on larval habitats is still very scarce. InMerosargusspecies, adult males defend oviposition sites, and this territorial behavior may lead to interspecific competition and make even more important the specialization and niche partitioning to prevent competitive exclusion. This study identified substrate types used as a resource byMerosarguslarvae and investigated the degree of specialization and overlap in resource use by different species at an Atlantic forest remnant in Minas Gerais, Brazil. Every potential resource, especially those with adults in the vicinity, was collected opportunistically from October 2001 to October 2004. In total, 292 individuals from 12Merosargusspecies collected from 21 resource types and 15 plant species were reared in the laboratory. Plant species included herbs, vines, palms, and trees. SixMerosargusspecies were reared from only one resource type, and each resource type was used, on average, by less than twoMerosargusspecies. Thus,Merosargusspecies exhibited a high degree of specialization and small overlap in larval resource selection, which could explain the high local and global diversity of the genus.
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