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Impacts of invasive Amur honeysuckle, Lonicera maackii, leaf litter on multiple trophic levels of detritus-based experimental wetlands
Freshwater Biology ( IF 2.7 ) Pub Date : 2021-05-24 , DOI: 10.1111/fwb.13731
Alexis L. Robison 1 , Josey L. Berta 2 , Cy L. Mott 2 , Kurt J. Regester 1
Affiliation  

  1. Wetlands are especially vulnerable to invasive plants because seasonal movements of sediments, water, nutrients, and debris from adjacent terrestrial habitats create ecological conditions suitable for invasion. Lonicera maackii is a relatively abundant and broadly distributed invasive shrub in the eastern U.S.A., yet few studies have simultaneously tested for effects of its leaf litter on multiple trophic levels within wetland food webs.
  2. Hatching success, hatchling survival, and hatchling size of tadpoles (Acris crepitans) were assessed using a laboratory mesocosm experiment with no-leaf, native-leaf, and L. maackii-leaf treatments. In the field, short-term (c. 3 week) and long-term (c. 2 years) mesocosm experiments assessed the initial and persistent impacts, respectively, of L. maackii on measures of primary productivity, invertebrate abundance and community structure, and oviposition preference and larval survival of Cope's gray treefrog (Hyla chrysoscelis).
  3. Exposure of eggs to L. maackii leaves reduced body size at hatching and larval survival of newly hatched A. crepitans. In short-term experiments, Lmaackii leaves reduced dissolved oxygen levels, filamentous algal biomass, and macroinvertebrate abundance, and altered macroinvertebrate community structure. In long-term experiments, duckweed cover was 15× times greater in mesocosms with L. maackii leaf additions. Oviposition by a local population of H. chrysoscelis was 10× lower in both short- and long-term mesocosms with L. maackii present.
  4. Although ecological impacts of L. maackii have been reported for terrestrial systems, our study is the first to demonstrate the simultaneous effects of its leaves on multiple trophic levels within replicated experimental wetlands. The relatively rapid decomposition of L. maackii leaves, and associated pulse of phenolic compounds, is the most likely proximate mechanism of the bottom-up effects we observed. The mechanisms, timing, and significance of effects is predicted to vary among natural wetlands.
  5. Our study demonstrates multiple ecological impacts of a terrestrial invasive shrub within experimental wetlands. Detailed studies on the specific mechanisms, and their spatial and temporal variability in natural systems, will elucidate management strategies and improve the efficiency of wetland conservation efforts.


中文翻译:

入侵的阿穆尔忍冬、忍冬、落叶对碎屑实验湿地多个营养水平的影响

  1. 湿地特别容易受到入侵植物的影响,因为来自相邻陆地栖息地的沉积物、水、养分和碎片的季节性移动创造了适合入侵的生态条件。Lonicera maackii是美国东部相对丰富且分布广泛的入侵灌木,但很少有研究同时测试其落叶对湿地食物网中多个营养级的影响。
  2. 使用无叶、原生叶和L. maackii叶处理的实验室中观实验评估了蝌蚪 ( Acris crepitans ) 的孵化成功率、孵化存活率和孵化大小。在短期(场Ç 3周)和长期(Ç。2年)围隔实验评估了初始和持续的影响,分别L.忍冬上初级生产力,无脊椎动物丰度和群落结构的措施, Cope 灰树蛙 ( Hyla chrysoscelis ) 的产卵偏好和幼虫存活率。
  3. 将卵暴露于L. maackii会使新孵化的A. crepitans在孵化和幼虫存活时的体型减小。在短期实验中,Lmaackii叶子降低了溶解氧水平、丝状藻类生物量和大型无脊椎动物的丰度,并改变了大型无脊椎动物的群落结构。在长期实验中,浮萍在中层中的浮萍覆盖率是L. maackii叶添加物的15 倍。在存在L. maackii 的短期和长期中胚层中,H. chrysoscelis当地种群的产卵量要低 10 倍。
  4. 尽管已经报告了L. maackii对陆地系统的生态影响,但我们的研究首次证明了其叶子对重复实验湿地内多个营养水平的同时影响。L. maackii叶子的相对快速分解以及相关的酚类化合物脉冲,是我们观察到的自下而上效应最可能的近似机制。预计影响的机制、时间和重要性因自然湿地而异。
  5. 我们的研究证明了实验湿地内陆生入侵灌木的多种生态影响。详细研究自然系统中的具体机制及其时空变异性,将阐明管理策略并提高湿地保护工作的效率。
更新日期:2021-07-23
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