Abstract Modelling studies on climate change predict continuous increases in atmospheric carbon dioxide concentration [CO2] and increase in temperature. This may alter carbon-based phytochemicals such phenolics and modify plant interactions with herbivorous. We investigated the effects of enhanced [CO2] and local climatic variation on young coffee plants, Coffea arabica L. cv Catuaí vermelho IAC-144 and Obatã vermelho IAC-1669-20, cultivated in the FACE (Free-Air Carbon Dioxide Enrichment) facility under two atmospheric [CO2] conditions. Coffee leaves were evaluated for total soluble phenolics (TSP), chlorogenic (5-CQA) and caffeic (CAF) acids, diversity and population size of mites, along two dry and two rainy seasons. Elevated atmospheric CO2 (e[CO2]) significantly decreased 5-CQA in cv. Catuaí but did not affect cv. Obatã. Species richness and population size of mites in coffee leaves were not affected by e[CO2] but were strongly related to the seasonal variability of coffee leaf phenolics. In general, high levels of phenolics were negatively correlated with population size while the mite species richness were negatively correlated with 5-CQA and TSP levels. Our findings show that [CO2] enhancement affects phenolics in coffee plants differentially by cultivars, however seasonality is the key determinant of phenolics composition, mite species richness and population size.

Este trabalho teve como objetivos identificar os ácaros da subordem Gamasida em Piracicaba, Estado de São Paulo, bem como determinar a predominância específica em cada um dos ambientes estudados. Coletas de solo foram feitas em três ambientes diferentes, uma área de mata residual secundária do tipo mesófila semidecídua, outra de cultura perene, representada pelo plantio de seringueira (Hevea brasiliensis Müll. Arg.), clone RRIM 600, e outra de culturas anuais (milho seguido de feijão). Coletas de folhedo foram realizadas apenas na mata secundária e no plantio de seringueira. A extração da acarofauna edáfica foi feita através do método de Berlese-Tullgren modificado. Foram identificadas 49 espécies pertencentes a 30 gêneros de Gamasida nos dois substratos, solo e folhedo. No solo, as espécies dominantes na mata secundária foram Ologamasus sp. 1 (Ologamasidae) e Cosmolaelaps sp. 1 (Laelapidae). No plantio de seringueira, Vulgarogamasus sp. (Parasitidae) e Cosmolaelaps sp. 2 (Laelapidae) foram as mais abundantes. Na área de culturas anuais, Protogamasellus mica (Athias-Henriot) (Ascidae) foi a espécie marcadamente dominante. No folhedo, as espécies mais abundantes na mata secundária foram Ologamasus sp. 1 e Ologamasus sp. 2 (Ologamasidae), Podocinum sagax Berlese (Podocinidae) e Cosmolaelaps sp. 1 (Laelapidae), enquanto no plantio de seringueira, foram Cosmolaelaps sp. 2 (Laelapidae) e Amblyseius hexadens Karg (Phytoseiidae).

The objectives of this work were to identify the edaphic mites collected in Piracicaba, State of São Paulo, and to determine the specific predominance in each of the environments studied. Soil samples were collected in three different environments, namely in an area of secondary forest, an area of perennial crops, represented by a rubber tree plantation (Hevea brasiliensis Müll. Arg.), clone RRIM 600 and an area of annual crops (corn followed by bean). Litter samples were collected in the patch of secondary forest and the rubber tree plantation. The edaphic mites were extracted through a modification of the Berlese-Tullgren method. A total of 49 species in 30 genera of Gamasida were identified in the soil and litter substrata. In the soil, the most abundant species in the secondary forest were Ologamasus sp. 1 (Ologamasidae) and Cosmolaelaps sp. 1 (Laelapidae). In the rubber tree plantation, Vulgarogamasus sp. (Parasitidae) and Cosmolaelaps sp. 2 (Laelapidae) were the most abundant species. In the area of annual crops, Protogamasellus mica (Athias-Henriot) (Ascidae) was by far the dominant species. In the litter, the most abundant species in the secondary forest were Ologamasus sp. 1 and Ologamasus sp. 2 (Ologamasidae), Podocinum sagax Berlese (Podocinidae) and Cosmolaelaps sp. 1 (Laelapidae), while in the rubber tree plantation the dominant species were Cosmolaelaps sp. 2 (Laelapidae) and Amblyseius hexadens Karg (Phytoseiidae).