Community metabolism in shallow coral reef and seagrass ecosystems, lower Florida Keys
Community metabolism in shallow coral reef and seagrass ecosystems, lower Florida Keys
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DOI：
10.3354/meps11385
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发表时间：
2015-10-28
影响因子：
2.5
通讯作者：
McGillis, W. R.
中科院分区：
文献类型：
--
作者：
Turk, D.;Yates, K. K.;McGillis, W. R.
2012年10月，在下佛罗里达礁群中，利用围隔和氧梯度通量技术，测量了珊瑚礁和海草生物群落净群落生产量（NEP）和净群落钙化量（NEC）的日变化。海草和珊瑚礁的NEP和NEC显示出日变化，在近海底光照水平> 100-300 mu Einstein m（-2）s（-1）时为正值。在白天，我们在海草和珊瑚礁站点分别检测到12.3和8.6 mmol O-2 m（-2）h（-1）的平均NEP。在晚上，NEP在海草网站是相对恒定的，而在珊瑚礁，净呼吸是最高的黄昏后立即和下降，在其余的夜晚。在海草现场，NEC值从白天的0.20 g CaCO 3 m（-2）h（-1）到夜间的-0.15 g CaCO 3 m（-2）h（-1）不等，在珊瑚礁现场从0.17到-0.10 g CaCO 3 m（-2）h（-1）不等。海草和珊瑚礁的网站之间的pH值和文石饱和状态（欧米茄（ar））没有显着差异。雷暴期间光照水平的降低显著降低了NEP，使系统从净自养转变为净异养。
Diurnal variation of net community production (NEP) and net community calcification (NEC) were measured in coral reef and seagrass biomes during October 2012 in the lower Florida Keys using a mesocosm enclosure and the oxygen gradient flux technique. Seagrass and coral reef sites showed diurnal variations of NEP and NEC, with positive values at near-seafloor light levels > 100-300 mu Einstein m(-2) s(-1). During daylight hours, we detected an average NEP of 12.3 and 8.6 mmol O-2 m(-2) h(-1) at the seagrass and coral reef site, respectively. At night, NEP at the seagrass site was relatively constant, while on the coral reef, net respiration was highest immediately after dusk and decreased during the rest of the night. At the seagrass site, NEC values ranged from 0.20 g CaCO3 m(-2) h(-1) during daylight to -0.15 g CaCO3 m(-2) h(-1) at night, and from 0.17 to -0.10 g CaCO3 m(-2) h(-1) at the coral reef site. There were no significant differences in pH and aragonite saturation states (Omega(ar)) between the seagrass and coral reef sites. Decrease in light levels during thunderstorms significantly decreased NEP, transforming the system from net autotrophic to net heterotrophic.