山东小黑山岛海萝生物量和长度的时空变化及影响因素

Spatiotemporal variation and related affecting factors of Gloiopeltis furcata biomass and length around Xiaoheishan Island,Shandong of China

海萝是一种重要的经济红藻,人为扰动导致了该资源的严重衰退.本文研究了资源保护良好的山东小黑山岛海萝自然种群生物量和长度的时空分布规律及其影响因素.协方差分析表明,环岛尺度下底质和向海开放度对海萝生物量和长度影响显著,岩礁底质和大的向海开放度利于海萝生长;两因素方差分析表明,微生境尺度下浪击和潮位对海萝生物量和长度影响显著,迎浪和适中潮位利于海萝生长.单因素重复测量方差分析表明,海萝生物量和长度的季节变化显著,海萝适宜生长期为3—4月,生物量和长度峰值出现在春末夏初.

Gloiopeltis furcata, an important economic red macroalga, has been severely depleted due to human disturbances. Taking the natural G. furcata populations around the Xiaoheishan Is- land of Shandong, China as test objects, this paper studied the spatiotemporal variation pattern of their biomass and length and related affecting factors. The two-way ANCOVA showed that at island scale, both the subbottom and the Baardseth index had significant effects on the G. furcata biomass and length. The steady subbottom and the high Baardseth index were beneficial to the G. furcata growth. At microhabitat scale, wave action and tidal level had significant effects on the G. furcata biomass and length. Wave wash and moderate tidal level promoted the G. furcata growth. The one- way repeated measurements ANOVA showed there existed seasonal variation of G. furcat biomass and length. The optimal growth period of G. furcata was from March to April, with the peak values of biomass and length appeared in late spring and early summer.