Goulart Maíra Figueiredo, Lemos Filho José Pires, Lovato Maria Bernadete
Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, 31270-010, Belo Horizonte, MG, Brazil.
Ann Bot. 2005 Sep;96(3):445-55. doi: 10.1093/aob/mci193. Epub 2005 Jun 22.
Plathymenia reticulata (Leguminosae) is a Brazilian tree that occurs in two biomes: Cerrado, a woody savanna vegetation, and the Atlantic Forest, a tropical forest. In this study, phenological patterns and their variability within and among populations located in these biomes and in transitional zones between them were assessed.
During a 15-month period, individuals from two populations in Cerrado, two in the Atlantic Forest, and six in transitional zones (three in a cerrado-like environment and three in forest fragments) were evaluated in Minas Gerais State, Brazil. The individuals were evaluated monthly according to the proportion of the canopy in each vegetative phenophase (leaf fall, leaf flush and mature leaves) and each reproductive phenophase (floral buds, flowers, immature fruits and mature fruit/seed dispersal). In order to assess the phenological variability within and among populations, habitats and biomes, the Shannon-Wiener diversity index, the Morisita-Horn similarity index and genetic population approach of partitioning diversity were used.
Populations of P. reticulata, in general, showed similar phenology; the main differences were related to leaf fall, a process that starts months earlier in the Cerrado than in transitional sites, and even later in forest areas. Considerable synchrony was observed for reproductive phenology among populations and between biomes. Most phenological diversity was due to differences among individuals within populations.
In spite of environmental differences, P. reticulata from the Atlantic Forest and Cerrado showed similar phenological behavior with only about 10% of the total diversity being attributed to differences between biomes.
网脉豆梨（豆科）是一种巴西树木，生长于两个生物群落：塞拉多，一种木质稀树草原植被；以及大西洋森林，一种热带森林。在本研究中，评估了位于这些生物群落及其过渡带的种群内部和种群之间的物候模式及其变异性。
在15个月的时间里，对巴西米纳斯吉拉斯州塞拉多的两个种群、大西洋森林的两个种群以及过渡带的六个种群（三个处于类似塞拉多的环境中，三个处于森林片段中）的个体进行了评估。根据每个营养物候期（落叶、叶芽萌发和成熟叶）和每个生殖物候期（花芽、花、未成熟果实和成熟果实/种子传播）的树冠比例，每月对个体进行评估。为了评估种群内部和种群之间、栖息地和生物群落之间的物候变异性，使用了香农 - 维纳多样性指数、森下 - 霍恩相似性指数以及划分多样性的遗传种群方法。
一般来说，网脉豆梨种群表现出相似的物候；主要差异与落叶有关，落叶过程在塞拉多比在过渡地带早几个月开始，在森林地区甚至更晚。在种群之间和生物群落之间，生殖物候观察到相当程度的同步性。大多数物候多样性是由于种群内个体之间的差异。
尽管环境存在差异，但来自大西洋森林和塞拉多的网脉豆梨表现出相似的物候行为，生物群落之间的差异仅占总多样性的约10%。
