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MITE OCCURRENCE in Lantana Camara FLOWERS MARIA A. WATANABE 1; ALINE De H. N. MAIA1 E GILBERTO NICOLELLA1 (1) Embrapa Meio Ambi

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MITE OCCURRENCE in Lantana Camara FLOWERS MARIA A. WATANABE 1; ALINE De H. N. MAIA1 E GILBERTO NICOLELLA1 (1) Embrapa Meio Ambi MITE OCCURRENCE IN Lantana camara FLOWERS MARIA A. WATANABE 1; ALINE de H. N. MAIA1 e GILBERTO NICOLELLA1 (1) Embrapa Meio Ambiente, Caixa Postal 69, 13820-000 Jaguariúna, SP, Brazil. e-mail: [email protected] Aceito para publicação em: 12/02/2006. RESUMO plantas diferentes, promovendo a fecundação Ocorrência de ácaros em flores de Lantana camara cruzada. Assim, os ácaros foréticos têm um duplo – Lantana camara é um arbusto perene com papel na reprodução de lantana, podendo ser interesse agronômico pois se trata de planta considerados pragas bem como organismos invasora principalmente de pastagens quando em benéficos, dependendo se se trata de lantana estado selvagem e uma bela planta ornamental em cultivada ou em estado selvagem. Os Mesostigmata suas variedades/cultivares cultivadas. Suas flores sendo predadores, por outro lado, tem papel são polinizadas por borboletas que são vistas benéfico como biocontroladores de pragas. visitando-as freqüentemente e por abelhas e beija- Palavras-chave: Mesostigmata, Astigmata, flores. A polinização cruzada é necessária nesta polinização, foresia, lantana planta para ocorrer formação de frutos e sementes, ABSTRACT estas últimas sendo seu principal mecanismo de MITE OCCURRENCE IN Lantana camara L. reprodução. No corpo desses polinizadores vivem FLOWERS em foresia ácaros das ordens Mesostigmata e Lantana camara is a perennial shrub with Astigmata que “tomando carona” chegam às flores agronomical interest as it is a weed mainly of de lantana, quando aqueles polinizadores visitam pastures in wild state and it is a beautiful ornamental essas plantas. A distribuição de ácaros nessas plant in its cultivated varieties/cultivars. Its flowers flores é significativamente afetada por fatores como are pollinated by butterflies which are often seem a temperatura e a umidade relativa do ar, pois os visiting them, and by bees and hummingbirds. Cross ácarossão muito sensíveis ao dessecamento em pollination is needed in this plant for fruit and seed condições de alta temperatura e baixa umidade set, this latter being its main reproductive relativa. A freqüência relativa de ácaros em flores mechanism. On the body of these pollinators mites vermelhas foi nove vezes maior que em flores of the orders Mesostigmata and Astigmata live in amarelas, em flores alaranjadas e rosas, esta phoresy and by hitch-hiking arrive to lantana flowers, freqüência foi próxima de cinco vezes maior que em when those pollinators visit these plants. Mite flores amarelas. Isto está relacionado ao distribution in these flowers is significantly affected comprimento da corola das flores de lantana, mais by factors such as temperature and air relative longa em flores vermelhas e rosas e mais curtas em humidity, as mites are sensible to dessication under flores amarelas.Os ácaros consomem 40% do high temperature and low relative humidity volume de néctar das flores, reduzindo a conditions. Relative frequency of mites in red flowers disponibilidade deste alimento aos polinizadores, was nine times higher than in yellow flowers, in que evitam visitar flores cujo néctar foi parcialmente orange and pink flowers, this frequency was close to consumido. Isto reduz a produção de sementes, five times higher than in yellow flowers. This is mas também obriga os polinizadores a visitar related to the lantana flower corolla length, longer in red and pink flowers and shorter in yellow flowers. al., 1986; Colwell and Naeem, 1999) are lantana Mites consume 40 % of flower nectar volume, flower pollination agents. Among these plants selfing reducing the availability of this food to pollinators, can occur, but cross pollination is needed for which avoid visiting flowers which nectar was maximization of fruit and seed set, and these latter partially consumed. This reduces seed production, are its main reproductive mechanism (Barrows, but also obliges the pollinators to visit different 1976; Goulson and Derwent, 2004). Lantana flowers plants, promoting cross fecundation. Thus the are visited by the following butterfly species: phoretic mites have a double role in lantana Agraulis vanillae, Anastia fatima, A. jatrophae, reproduction, so they may be considered pests as Danaus plexippus, D. gilippus, Eurema daira, well as beneficial organisms depending on the Lycorea ceres, Urbanus sp. And some butterfly cultivated lantana or wild state ones. The species belonging to Hesperiidae and Pieridae Mesostigmata being predatory on the other side has families under Costa Rica conditions, during March another beneficial role as pest biocontrollers. (Barrows, 1976). Humming birds and butterflies Key words: Mesostigmata, Astigmata, phoresy, compete for flower nectar as these birds are seem pollination, lantana scaring these insects (Primack and Howe, 1975) as INTRODUCTION well as bees scaring humming birds (Irwin and Originated from Central and South America Brody, 1998). (Lorenzi and Souza, 2004), Lantana camara L. is a Mites are non-winged arthropods; their perennial shrub which reaches up to 1.5 m high, dissemination in the environment is made by wind, a presenting dense ramification and heary, harsh passive process that allows their distribution over leaves (Bacchi et al., 1984). The variously colored wide areas, by walking on their feet or by phoresy. flowers, can be orange, yellow, white, purple, pink or Phoresy is defined as a form of commensalism, red or with changing color according to age, are where one of the organisms (the phoretic organism) assembled in inflorescences (Bacchi et al., 1984; adheres to the body of the other (the phoretic host) Lorenzi and Souza, 2004) and measure up to 2 cm and is transported by the latter among the plants in length (Weiss, 1991; Lorenzi and Souza, 2004). where “disembarks”, and with respect to this aspect It is a plant with agronomic interest, because in it is a special form of migration (Binns, 1982; wild state is a pastureland weed with toxic effect to O’Connor, 1982; Houck and Connor, 1991). The livestock (Lorenzi, 1991. Fenshan et al., 1994; mites of the order Astigmata are phoretic in Swarbrick and Wilson, 1995). When cultivated in its butterflies, moths, bees (Houck and O’Connor, hundreds of varieties/cultivars, which can belong to 1991) Coleoptera (O’Connor, 1982; Houck and the species Lantana camara or hybrids between L. O’Connor, 1991), humming birds (Colwell, 1979; camara and L. montevidensis are showy ornamental 1985. Naeem et al., 1985) mammals (Houck and plants (Lorenzi and Souza, 2004). Under weed O’Connor, 1991). Phoresy is also observed among conditions, in the original region as well an in the mites of the order Mesostigmata (Boggs and regions where it had been introduced, lantana has Gilbert, 1987; Colwell, 1995; Naeem et al., 1985). been object of biological control, with 36 insect Phoretic mites adhere to specific parts of the host species and 5 fungi species (Thomas and Ellison, bodies as butterfly proboscis and head (Houck and 2000) tested as possible control agents. O’Connor, 1991; Boggs and Gilbert, 1987) and Bees (Goulson and Derwent, 2004), butterflies humming bird’s nares (Colwell, 1979; 1985). The (Schemske, 1976; Boggs and Gilbert, 1987) and mite Proctolaelaps lobata De Leon (order humming birds (Colwell, 1979; 1985; Feinsinger et Mesostigmata) is specific of lantana flowers and is phoretically transported by butterflies and prefers to change according to age, and this fact affects the disembark in flowers opened on the day, where it pollinators’ behavior (Weiss, 1991). The occurs in higher number (Boggs and Gilbert, 1987). inflorescences were placed in plastic containers Mites of the genera Rhinoseius and Tropicoseius, (Sanremo) with water to avoid wilting and examined phoretic in humming bird nares are distributed at Entomology Laboratory. Samples of 50 florets of among lantana flowers by these hosts (Colwell, each color were taken, which were cut along their 1979. 1995; Naskrecki and Colwell, 1998; Colwell length one by one by using a blade (Gillette Co.) and and Naeem, 1999; Soroker et al., 2003). These the number of mites existing in each floret counted mites live and reproduce in lantana flowers and under stereomicroscope (Carl Zeiss, Germany) with feeding on pollen and nectar (Colwell, 1979; 1995; 10 and 25 times magnification. The mites were Colwell and Naeem, 1999). collected and conserved in 70% ethanol and sent to Mites can consume up to 40% of nectar Dr. Gilberto José de Moraes from Zoology volume of the plant Hamelia patens; including the Departament, ESALQ/USP, for identification. humming birds it is consumed 85% of the nectar The obtained results were firstly utilized for volume. As the mites consume considerable contruction of contingency tables, to test data proportion of the nectar, they can be considered as homogeneity. After the statement of heterogeneity, pest, as they reduce nectar availability for the correlation analysis with physical environment pollinators (butterflies and humming birds) and factors – temperature (o C), air relative humidity (%) render the flowers less attractive to this agents and solar radiation (W) – prevailing at the (Colwell, 1995). The pollinators not visiting the inflorescence collection time was made, and flowers with partially consumed nectar, it will occur correlation coefficients r were estimated. reduction in fruit and seed set. Conversely, this fact In order to visualized and to compare the mite can also be beneficial to plants, as this obliges the number found by its set of data, histograms were pollinators to visit different plants,
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