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首页> 美国卫生研究院文献>PLoS Clinical Trials >The Effects of Experimental Irrigation on Plant Productivity, Insect Abundance and the Non-Breeding Season Performance of a Migratory Songbird
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The Effects of Experimental Irrigation on Plant Productivity, Insect Abundance and the Non-Breeding Season Performance of a Migratory Songbird

机译：实验灌溉对迁徙鸣禽植物生产力，昆虫丰度和非繁殖季节表现的影响

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Migratory bird populations are often limited by food during the non-breeding season. Correlative evidence suggests that food abundance on territories varies among years in relation to rainfall, which affects plant productivity and arthropod biomass. At the Font Hill Nature Preserve in Jamaica, we used an irrigation experiment to test the hypothesis that rainfall affects the condition of wintering American redstarts (Setophaga ruticilla) via intermediate effects on plant productivity and arthropod abundance. Experimental plots were irrigated in late February and early March to simulate a mid-season pulse of 200 mm of rain. Irrigation maintained soil moisture levels near saturation and had immediate effects on plant productivity. Cumulative leaf abscission over the dry season was 50% lower on experimental plots resulting in greater canopy cover, and we observed significantly higher ground level shoot growth and the flushing of new leaves on about 58% of logwood (Haematoxylon campechianum) individuals. Arthropod biomass was 1.5 times higher on irrigated plots, but there was considerable inter-plot variability within a treatment and a strong seasonal decline in biomass. Consequently, we found no significant effect of irrigation on arthropod abundance or redstart condition. We suspect that the lack of an irrigation effect for taxa higher on the trophic chain was due to the small spatial scale of the treatment relative to the scale at which these taxa operate. Although redstart condition was not affected, we did observe turnover from subordinate to dominant territorial individuals on experimental plots suggesting a perceived difference in habitat quality that influenced individual behavior.
机译：在非繁殖季节，候鸟的数量通常受到食物的限制。相关证据表明，随着降雨的增加，领土上的食物丰度每年都在变化，这会影响植物的生产力和节肢动物的生物量。在牙买加的丰特希尔自然保护区，我们使用灌溉实验来检验以下假设：降雨通过对植物生产力和节肢动物丰度的中间影响来影响越冬美洲红start（Setophaga ruticilla）的状况。在2月下旬和3月初灌溉实验田，模拟了200毫米降雨的季节中期脉冲。灌溉使土壤湿度保持在饱和状态，并直接影响植物的生产力。在试验地上，干燥季节的累积叶片脱落降低了50％，从而导致了更大的树冠覆盖，并且我们观察到地上水平的枝条生长和大约58％的原木（Haematoxylon campechianum）个体的新叶潮红明显更高。节肢动物的生物量是灌溉地的1.5倍，但处理之间的地间差异很大，生物量季节性显着下降。因此，我们发现灌溉对节肢动物的丰度或重启动条件没有显着影响。我们怀疑营养链较高的分类单元缺乏灌溉效果是由于相对于这些分类单元操作的规模而言，处理的空间规模较小。尽管redstart条件没有受到影响，但我们确实在实验地块上观察到从下属到主要领地的人员更替，这表明栖息地质量的感知差异会影响个人行为。

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