Emergence stress and morphological constraints affect the species distribution and growth of subtropical intertidal seagrasses
Emergence stress and morphological constraints affect the species distribution and growth of subtropical intertidal seagrasses
复制标题
出现压力和形态限制影响亚热带潮间带海草的物种分布和生长
DOI：
10.3354/meps284117
复制
发表时间：
2004
影响因子：
2.5
通讯作者：
M. Nakaoka
中科院分区：
文献类型：
--
作者：
Yoshiyuki Tanaka;M. Nakaoka
本文研究了出苗胁迫和形态限制对3种亚热带海草--圆叶金藻Cymoelarotundata、圆叶金藻Cymoela.t.t.本文对锯齿海鲫和红刺海鲫的不同器官进行了移植试验和室内干燥试验。C. rotundata和T. hemprichii分布于日本西南部石垣岛附近的潮间带和潮下带，而C. serrulata只在潮下带发现。在同一种内，两种C. robundata和T. hemprichii明显小于潮下芽。在2001年7月和9月以及2002年1月进行了3次潮下至潮间带移植实验。在7月和9月，当潮间带暴露在空气中的时间较短时，移植的3个物种的新梢密度没有下降。与此相反，所有3个移植物种的新梢密度在2月份显著下降，当暴露在空气中的时间较长。C的生存。serrulata（初始密度的2%）的生长量远低于C. rotundata（48%）和T. hemprichii（48%）。在潮下-潮间带移植中，C. rotundata和T. hemprichii叶减少，接近潮间枝，表明形态可塑性强。原位观察发现，移植海草与大叶暴露在空气中的时间比潮间带控制。在干燥实验中，T. hemprichii叶片含水量高于C. rotundata和C.有锯齿的对C. rotundata和T. hemprichii和他们的能力，以改变拍摄大小似乎是有关的，这些物种在潮间带的生存更好的相比，C。有锯齿的这与观察到的潮间带物种分布的变化是一致的。
The effects of emergence stress and morphological constraints on the distribution and growth of 3 subtropical seagrass species, Cymodocea rotundata, C. serrulata and Thalassia hemprichii, were examined in a series of transplantation experiments and a laboratory desiccation experiment. C. rotundata and T. hemprichii occur in both the intertidal and subtidal zones off Ishi- gaki Island, southwest Japan, whereas C. serrulata is found only in the subtidal zone. Within the same species, intertidal shoots for both C. robundata and T. hemprichii are significantly smaller than subtidal shoots. A subtidal-to-intertidal transplantation experiment was conducted on 3 occasions: July and September 2001 and January 2002. In July and September, when the intertidal sites were exposed to air for a shorter period, shoot densities of the transplanted 3 species did not decrease. In contrast, the shoot densities of all 3 transplanted species decreased significantly in February, when the exposure to air was longer. The survival of C. serrulata (2% of the initial density) was much lower than that of C. rotundata (48%) and T. hemprichii (48%). In subtidal-to-intertidal transplants, the size of C. rotundata and T. hemprichii leaves decreased, approaching that of intertidal shoots, indicating high morphological plasticity. In situ observations revealed that transplanted seagrasses with large leaves were exposed to air for longer than were intertidal controls. In the desiccation experiment, T. hemprichii leaves had higher water contents than those of C. rotundata and C. serrulata. The mor- phological traits of C. rotundata and T. hemprichii and their ability to change shoot size appear to be related to the better survival of these species in the intertidal area as compared to C. serrulata. This is consistent with the observed variation in the species distribution in the intertidal zone.