In seasonal environments, while some primates change their behavioural patterns according to the total food available, others associate it with plant-specific food availability. We recorded behavioural and ecological data from one marmoset group at the edge of a 522-ha Atlantic Forest fragment in order to verify the seasonal and between-year patterns. We collected behavioural and diet data via scan sampling for 9 months (3 months/season), and estimated the fruiting source density. Fruit resources were significantly more available in the 2012 dry season than the 2012 rainy and 2013 dry seasons. Overall, foraging and moving were the main activities, and fruits and exudates were the principal food items consumed. During the rainy season, the common marmosets devoted more time to eating fruits, increased the niche breadth and food source revisitation frequency, and used the forest’s middle-strata more often. When we compared between-year data, we found that common marmosets rested more frequently, fed more often on invertebrates and had a broader niche breadth in the 2012 dry season than in the 2013 dry season. The availability of specific fruit resources and invertebrates appeared to influence study group activity budget and diet. Variation in food availability may have reduced diet niche breadth and stratum use. Our study confirms the well-established flexibility of common marmosets, and demonstrates key aspects of their foraging strategy to survive in modified habitats.

在季节性环境中，虽然一些灵长类动物会根据可用食物总量改变其行为模式，但另一些则将其与特定植物的食物供应量联系起来。我们记录了 522 公顷大西洋森林碎片边缘的一个狨猴群的行为和生态数据，以验证季节性和年际模式。我们通过扫描采样收集了 9 个月（3 个月/季节）的行为和饮食数据，并估计了结果源密度。2012 年旱季的水果资源明显多于 2012 年雨季和 2013 年旱季。总体而言，觅食和移动是主要活动，水果和分泌物是主要消耗的食物。在雨季，普通狨猴会花更多时间吃水果，增加了生态位宽度和食物来源的重访频率，更频繁地使用森林的中层。当我们比较年际数据时，我们发现普通狨猴在 2012 年旱季比 2013 年旱季更频繁地休息、更频繁地以无脊椎动物为食并且具有更广泛的生态位宽度。特定水果资源和无脊椎动物的可用性似乎会影响研究组的活动预算和饮食。食物供应的变化可能减少了饮食利基的广度和阶层使用。我们的研究证实了普通狨猴已经确立的灵活性，并展示了它们在改良栖息地中生存的觅食策略的关键方面。与 2013 年旱季相比，2012 年旱季更频繁地以无脊椎动物为食，生态位宽度更广。特定水果资源和无脊椎动物的可用性似乎会影响研究组的活动预算和饮食。食物供应的变化可能减少了饮食利基的广度和阶层使用。我们的研究证实了普通狨猴已经确立的灵活性，并展示了它们在改良栖息地中生存的觅食策略的关键方面。与 2013 年旱季相比，2012 年旱季更频繁地以无脊椎动物为食，生态位宽度更广。特定水果资源和无脊椎动物的可用性似乎会影响研究组的活动预算和饮食。食物供应的变化可能减少了饮食利基的广度和阶层使用。我们的研究证实了普通狨猴已经确立的灵活性，并展示了它们在改良栖息地中生存的觅食策略的关键方面。