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首页> 外文期刊>Marine biology >Diel cycles of activity, metabolism, and ammonium concentration in tropical holothurians
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Diel cycles of activity, metabolism, and ammonium concentration in tropical holothurians

机译：热带整lot鱼的活动，新陈代谢和铵离子浓度的Diel循环

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摘要

Movement rate, oxygen consumption, and respiratory tree ammonium concentration were measured in situ in the holothurians Pearsonothuria graeffei and Holothuria edulis in the Agan-an Marine Reserve, Sibulan, Philippines (9°20′30″N, 123°18′31″E). Measurements were made both day and night for both species during April-July 2005. P. graeffei had significantly higher movement rate during the day than at night (1.14 and 0.27 rah~(-1), respectively; three-way ANOVA, P ＜ 0.05) while H. edulis had higher movement rate at night compared to the day (0.83 and 0.07 m h~(-1), respectively), spending the daylight hours sheltering under coral. More than 80% of H. edulis had movement rate of zero during the day. Oxygen consumption of P. graeffei was significantly higher during the day than at night (1.61 and 0.83 umol O_2 g~(-1) h~(-1), respectively; two-way ANCOVA, P ＜ 0.05), but the reduction at night was not as pronounced as the reduction in movement. H. edulis had a 75% reduction in oxygen consumption during the day compared to night (0.51 and 1.96 μmol O_2 g~(-1) h~(-1), respectively), matching this species' reduced movement rates during the day. Ammonium concentration in water withdrawn from the respiratory trees of P. graeffei during the day (12.0 μM) was three times higher than in respiratory tree water sampled at night (4.3 μM) and 15 timesrnhigher than ambient seawater (0.8 μM; three-way ANOVA, P ＜ 0.05). Ammonium concentration in the respiratory tree water of H. edulis was six times higher at night (14.6 μM) than during the day (2.2 μM) and 16 times higher than that of ambient seawater (0.9 μM). Even though H. edulis and P. graeffei are found within the same coral reef environment, they may affect different substrates and reef organisms due to their different habitats and distinct but opposite diel cycles.
机译：在菲律宾Sibulan的Agan-an海洋保护区（9°20′30″ N，123°18′31″ E）的整形人Pearsonothuria graeffei和Holothuria edulis中的原位测量了运动速率，耗氧量和呼吸树铵浓度。 ）。在2005年4月至7月期间，对这两个物种的昼夜进行了测量。葛缕子的白天运动速率明显高于夜晚（分别为1.14和0.27 rah〜（-1）；三向方差分析，P ＜ 0.05），而晚上的可食红景天比白天有更高的移动速度（分别为0.83和0.07 mh〜（-1）），白天白天躲在珊瑚下。白天，超过80％的可食链球菌的运动率为零。葛缕子的耗氧量明显高于白天（分别为1.61和0.83 umol O_2 g〜（-1）h〜（-1）；双向ANCOVA，P ＜0.05），但在夜间降低。夜晚不如动静减少那么明显。相比于夜间，H。edulis在白天的耗氧量减少了75％（分别为0.51和1.96μmolO_2 g〜（-1）h〜（-1）），与该物种白天的运动速度降低相称。白天从P. graeffei呼吸树中抽出的水中的氨浓度（12.0μM）比夜间采样的呼吸树水（4.3μM）高三倍，比环境海水（0.8μM；高三倍，方差分析）高15倍。 ，P ＜0.05）。晚上，可食的H. edulis呼吸树水中的铵浓度比白天（2.2μM）高六倍（14.6μM），比周围海水（0.9μM）高16倍。尽管在相同的珊瑚礁环境中发现了可食的H. edulis和P. graeffei，但由于它们不同的生境和不同但相反的diel循环，它们可能影响不同的底物和珊瑚生物。

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