Influência da estrutura da vegetação de cerrado na assembleia de ácaros plantícolas
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2016-03-18
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Universidade Federal de Goiás
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Plant inhabiting mites are little known in Natural Ecosystems since the most studies with
these animals were held in agroecosystems. Cerrado biome presents several
phytophysiognomic types with distinct environmental characteristics, ranging from open
areas (Campo Cerrado) to forest (Cerradão). The phytophysiognomy can be crucial in
organizing assemblage of plant-dwelling arthropods because they have differences in
physical and chemical characteristics of the microenvironment, and in the floristic
composition, richness and abundance of plant species. In the present study we evaluated
Cerrado vegetation structure effect in the organization of mites assemblage on Miconia
albicans (Sw.) Triana plants from Emas National Park, which represent the largest
Cerrado protected area. We sampled 21 10x10 m-plots, being 12 distributed in Campo
Cerrado (CC) and nine in Cerrado Sentido Restrito (CSR). In each plot, one M. albicans
individual was marked for mite sample, preferably, those located closer to the plot center.
We collected 10 leaves around median extract canopy of each marked plant, which in turn
were washed in 70 % alcohol for extracting mites. In the laboratory, the mites were observed under dissecting microscopy, mounted on microscope slides and identified
under phase constrast microscopy. We sampled a total of 463 mites, being 347 in CSR
and 116 in CC, distributed in 44 species and 14 families. We reported three genera for the
first time to Brazil, namely, Phytoptipalpus (Tenuipalpidae), Paraciota (Eriophyidae) e
Idiolorryia (Tydeidae). Miconia albicans plants from Cerrado Sentido Restrito showed
greater richness and abundance of mites than those in Campo Cerrado. These results were
significant when all mites were analyzed together and also when only considered the
phytophagous mites. These results can be explained by two mechanisms: (i) Cerrado
Sentido Restrito presents greater host plant richness and abundance, what allowed support
more individuals, and consequently greater species richness; or (ii) plants from Campo
Cerrado have greater leaf toughness, which difficult the establishment and development
of phytophagous mites on their leaves, thus interfering in occurrence and abundance of
other trophic levels. Therefore, the vegetation structure and leaf characteristics, typical of
each vegetation formation, may have been decisive in occurrence and establishment of
mites on M. albicans leaves, mainly for Phytophagous.
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NUNES, S. N. Influência da estrutura da vegetação de cerrado na assembleia de ácaros plantícolas. 2016. 47 f. Dissertação (Mestrado em Biodiversidade Animal) - Universidade Federal de Goiás, Goiânia, 2016.