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Simulated green turtle grazing affects nutrient composition of the seagrass Thalassia testudinum

机译：模拟的绿海龟放牧会影响海草地中海草睾丸的营养成分

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摘要

Before populations of green turtles (Chelonia mydas) were severely reduced by human overexploitation, the seagrass Thalassia testudinum was intensively grazed by green turtles in the Caribbean. To explore how nutrient composition of T. testudinum pastures responds to intense grazing pressure, we simulated green turtle grazing in 15 plots (each 3 m x 3 m) for 16 months in the central Bahamas. Comparisons of clipped plots with 15 adjacent control (undipped) plots revealed that simulated grazing resulted in significantly higher energy, nitrogen, phosphorus, lignin, cutin, and condensed tannin content in blades in clipped plots, but sediment organic content was not affected. By continually re-cropping blades in grazing plots, turtles ingest young, actively growing blade tissue with higher energy, nitrogen, and phosphorus concentrations. Our 16-month clipping trial did not generate the expected decline in nutrient content in T. testudinum blades under intensive grazing. However, significant decreases in nitrogen and organic matter reserves in rhizomes, with declines apparent after 16 and 11 months, respectively, indicate that nutrient content of blades and/or blade productivity may decline under continued clipping.
机译：在人类过度开发严重减少绿海龟（Chelonia mydas）种群之前，加勒比海的绿海龟对草丛中的海藻Thalasia testudinum进行了强烈放牧。为了探索睾丸草牧场的营养成分如何响应强烈的放牧压力，我们在巴哈马中部的15个样地（每个3 m x 3 m）中模拟了16个月的绿海龟放牧。将修剪的地块与15个相邻的对照（未修剪的）地块进行比较后发现，模拟放牧会导致修剪的地块中叶片中的能量，氮，磷，木质素，角质和冷凝的单宁含量显着提高，但沉积物的有机物含量不受影响。通过不断在放牧地上重新种植刀片，海龟会摄取能量，氮和磷含量较高的年轻活跃的刀片组织。我们的为期16个月的修剪试验并未在密集放牧的情况下导致睾丸网叶片营养成分的预期下降。但是，根茎中氮和有机质储量的显着下降，分别在16个月和11个月后明显下降，表明叶片的营养成分和/或叶片生产力在持续修剪下可能会下降。

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  • 来源
    《Marine biology》 |2007年第6期|p.1083-1092|共10页
  • 作者

    Kathleen L. Moran; Karen A. Bjorndal;

  • 作者单位

    Archie Carr Center for Sea Turtle Research and Department of Zoology, University of Florida, P.O. Box 118525, Gainesville, FL 32611, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境生物学;
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