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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Bucktooth parrotfish Sparisoma radians grazing on Thalassia in Bermuda varies seasonally and with background nitrogen content
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Bucktooth parrotfish Sparisoma radians grazing on Thalassia in Bermuda varies seasonally and with background nitrogen content

机译：在百慕大丘陵地带放牧的齿鹦嘴鱼弧度随季节变化，并具有背景氮含量

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摘要

Herbivory has an important influence on seagrass abundance and distribution, yet there is limited understanding of grazing behavior in communities at geographic margins of species ranges. We used 24-h seagrass-tethering experiments to measure the effect of foliar nitrogen content and time of year on bucktooth parrotfish Sparisoma radians herbivory in high-latitude Thalassia testudinum meadows of Bermuda. Parrotfish preferentially grazed nitrogen-enriched tethered shoots especially at offshore sites that had relatively low background nutrient levels. Selective feeding was pronounced during periods of high grazing intensity. We found strong seasonal patterns, likely because Bermuda is at the northerly limit of these two species. Herbivory rates peaked in late summer when the mean leaf removal rate by S. radians was 3.38± 1.11 cm shoot~(-1) day~(-1), which exceeded the daily seagrass growth rate by 10-fold. Seagrass meadows are in decline in this region and we suggest that seasonal episodes of clustered, intensive grazing could make these habitats more vulnerable to other environmental or human-induced stresses, such as storms and runoff of sediment and nutrients.
机译：草食对海草的丰度和分布具有重要影响，但对物种范围地理边缘的社区放牧行为的了解有限。我们使用24小时海草拴系试验来测量叶面氮含量和一年中的时间对百慕大高纬度Thalassia testudinum草地上的斑节目鹦嘴鱼Sparisoma radians草食动物的影响。鹦嘴鱼优先放牧富含氮的束缚枝条，特别是在背景营养水平相对较低的近海地点。在高放牧强度期间，选择性饲喂明显。我们发现了强烈的季节格局，可能是因为百慕大处于这两个物种的北端。食草率在夏末达到顶峰，当时弧菌的平均叶片去除率为3.38±1.11 cm芽〜（-1）天〜（-1），超过了每日海草生长速度的10倍。该地区的海草草甸数量正在减少，我们建议，季节性的集约化密集放牧可能会使这些栖息地更易遭受其他环境或人为压力，例如风暴以及沉积物和养分的径流。

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