CONSIDERAÇÕES FINAIS

Este trabalho confirma a alta frequência de interações entre formigas e diásporos carnosos no solo do Cerrado. A dispersão secundária direcionada dos diásporos de S.

guianensis por formigas a diferentes distâncias e densidades rearranjam as sementes numa

escala espacial mais fina, afetando o estabelecimento e desenvolvimento de plântulas no cerrado, como já evidenciado para outras espécies (veja Leal & Oliveira 1998; Christianini & Oliveira 2009, 2010, 2013). Assim, mesmo que em escalas menores (Horvitz & Le Corff 1981), as formigas têm um papel relevante no rearranjo espacial de sementes e no

recrutamento de plântulas em microsítios mais favoráveis (formigueiros) ao seu crescimento, mediando o ciclo populacional de plantas e consequentemente o processo regenerativo na comunidade do Cerrado.

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APÊNDICE

Tabela 3. Resultados da análise química e da penetrabilidade dos solos em ninhos de formiga e solos adjacentes (controle).

O. chelifer P. striata E. edentatum P. megacephala

Propriedade do solo

Tratamento Controle Wilcoxon Trat. Cont. Wilcoxon Trat. Cont. Wilcoxon Trat. Cont. Wilcoxon

pH (CaCl2 0,01 M) 3.56 3.56 0.844 3.48 3.46 0.600 3.45 3.46 0.888 3.52 3.54 0.798 Fósforo (mg/dm3) 10.66 10.33 0.423 11.66 11.4 0.506 10.46 10.73 0.570 10.93 11.13 0.504 Potássio (mmolc/dm3) 1.06 1.09 0.666 1.11 0.99 0.069 1.04 1.08 0.394 0.96 0.94 0.700 Cálcio (mmolc/dm3) 2.6 3.46 0.480 4.13 2.86 0.272 3.66 3.2 0.593 8.13 3.26 0.132 Nitrogênio Total (g/kg) 1.25 1.2 0.615 1.34 1.22 0.136 1.2 1.3 0.248 1.19 1.15 0.477 Matéria Orgânica (g/dm3) 34.86 34.06 0.924 30.06 35.06 0.570 33.46 32.93 0.690 30.53 32.06 0.362 Magnésio (mmolc/dm3) 1.06 1.33 0.108 1.26 1.26 1.000 1 0.93 0.592 1.26 1.13 0.463 H + Al (mmolc/dm3) 128.93 125.93 0.887 125.2 120.9 0.649 123.5 124.4 0.798 95.4 106.3 0.232 Boro (mg/dm3) 0.47 0.49 0.550 0.45 0.42 0.451 0.39 0.38 0.670 0.33 0.32 0.706

Cobre (mg/dm3) 0.56 0.55 0.575 0.58 0.57 0.313 0.54 0.52 0.423 0.52 0.57 0.061 Ferro (mg/dm3) 243.4 252.93 0.232 283.6 284.5 0.776 242.4 239.1 0.820 244.6 252.4 0.532 Manganês (mg/dm3) 2.09 2.21 0.932 2.09 2.02 0.363 1.74 1.77 0.900 2.06 2.24 0.733 Zinco (mg/dm3) 0.36 0.32 0.779 0.37 0.42 0.326 0.34 0.32 0.441 0.34 0.33 0.906 Penetrabilidade (mm) 60.78 46.66 0.012 54.98 46.15 0.015 50.24 46.08 0.232 46.36 41.46 0.023