Peralta-Maraver Ignacio, Robertson Anne L, Rezende Enrico L, Lemes da Silva Aurea Luiza, Tonetta Denise, Lopes Michelle, Schmitt Rafael, Leite Nei K, Nuñer Alex, Petrucio Mauricio M
Department of Life Sciences Roehampton University London UK.
Departamento de Ecología Facultad de Ecología y Recursos Naturales Universidad Andres Bello Santiago Chile.
Ecol Evol. 2017 May 17;7(13):4534-4542. doi: 10.1002/ece3.3031. eCollection 2017 Jul.
Food web studies provide a useful tool to assess the organization and complexity of natural communities. Nevertheless, the seasonal dynamics of food web properties, their environmental correlates, and potential association with community diversity and stability remain poorly studied. Here, we condensed an incomplete 6-year community dataset of a subtropical coastal lake to examine how monthly variation in diversity impacts food web structure over an idealized time series for an averaged year. Phytoplankton, zooplankton, macroinvertebrates, and fish were mostly resolved to species level ( = 120 trophospecies). Our results showed that the seasonal organization of the food web could be aggregated into two clusters of months grouped here as 'summer' and 'winter'. During 'winter', the food web decreases in size and complexity, with the number of trophospecies dropping from 106 to 82 (a 22.6% decrease in the number of nodes) and the trophic interactions from 1,049 to 637 between month extremes (a 39.3% drop in the number of links). The observed simplification in food web structure during 'winter' suggests that community stability is more vulnerable to the impact of any change during this period.
食物网研究为评估自然群落的组织和复杂性提供了一个有用的工具。然而，食物网属性的季节动态、它们与环境的相关性，以及与群落多样性和稳定性的潜在关联，仍然研究不足。在这里，我们汇总了一个亚热带沿海湖泊不完整的6年群落数据集，以研究在一个理想化的平均年份时间序列中，多样性的月度变化如何影响食物网结构。浮游植物、浮游动物、大型无脊椎动物和鱼类大多被解析到物种水平（共120个营养物种）。我们的结果表明，食物网的季节组织可以聚集成两个月的集群，在这里归类为“夏季”和“冬季”。在“冬季”，食物网的规模和复杂性降低，营养物种数量从106种降至82种（节点数量减少22.6%），极端月份之间的营养相互作用从1049次降至637次（连接数量下降39.3%）。在“冬季”观察到的食物网结构简化表明，在此期间，群落稳定性更容易受到任何变化的影响。
