The functional role that invasive species occupy within their new range is of significant interest for those concerned about invasive species management. Of particular importance is the distribution mechanisms of invasive plants. Viburnum dilatatum and Viburnum sieboldii are considered invasive species in New Jersey forest understories. We have observed that while the fruit of both species ripens at the same time, there is a difference in how long fruit persists. To better understand the temporal pattern, we examine fruit phenology and consumption, as well as energy density, percentage crude fat, and antioxidant capacity. We hypothesized that the difference in the timing of fruit consumption in these species is largely driven by nutritional content and that fruit with higher energy and fat content are eaten during migration. Our results indicate that V. sieboldii fruit is depleted in the fall, while V. dilatatum fruit persists into winter. In addition, we found that V. sieboldii fruit had higher energy density and 4.4 times as much crude fat compared to that of V. dilatatum fruit. However, V. dilatatum fruit had 9.5 times greater antioxidant capacity than V. sieboldii fruit. We also found that V. sieboldii fruit is mainly consumed by gray catbirds (Dumetella carolinensis) during the fall migration and the primary avian consumer of V. dilatatum fruit are American robins (Turdus migratorius) in the winter when birds are more sedentary. We suspect a mutualistic relationship has developed between these two invasive viburnum species and native avian frugivores. What remains to be seen is what effect different fruiting strategies have on seed dispersal.

对于那些关注入侵物种管理的人来说，入侵物种在其新范围内所扮演的功能性角色尤为重要。特别重要的是入侵植物的分布机制。荚莲荚莲和荚Vi被认为是新泽西州森林林下的入侵物种。我们已经观察到，虽然两种物种的果实都同时成熟，但是果实持续多长时间存在差异。为了更好地理解时间模式，我们检查了水果物候和消耗量，以及能量密度，粗脂肪百分比和抗氧化能力。我们假设这些物种的水果进食时间的差异主要是由营养含量驱动的，并且迁移过程中食用了能量和脂肪含量较高的水果。我们的结果表明，西伯利亚弧菌果实在秋天枯竭，而黑腹果蝇果实持续到冬季。此外，我们发现西伯利亚弧菌该果实的能量密度和粗脂肪比鞭毛果实的能量高4.4倍。然而，五dilatatum水果有9.5倍的抗氧化能力比五女花的水果。我们还发现，五女花的水果是由灰色catbirds（主要是消费Dumetella蜥）的秋季迁徙和初级消费者禽流感期间，五dilatatum水果旅鸫（鸫migratorius），在冬季鸟类较为久坐的时候。我们怀疑这两个入侵荚burn物种和本地鸟类节食动物之间已经建立了相互关系。尚待观察的是不同结果策略对种子传播的影响。