DIGESTION SURVIVAL OF ALGAE - SOME ECOLOGICAL COMPARISONS BETWEEN FREE SPORES AND PROPAGULES IN FECAL PELLETS
DIGESTION SURVIVAL OF ALGAE - SOME ECOLOGICAL COMPARISONS BETWEEN FREE SPORES AND PROPAGULES IN FECAL PELLETS
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DOI：
10.1111/j.0022-3646.1989.00693.x
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发表时间：
1989-12-01
影响因子：
2.9
通讯作者：
PAYA, I
中科院分区：
文献类型：
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作者：
SANTELICES, B;PAYA, I
底栖藻类[Enteromorpha compressa]通过不同类型的食草动物[Siphonaria lessoni，Fissurella crassa]的消化道后存活，或者再生新的组织，或者释放原生质体和蜂群，作为繁殖的辅助手段产生新的个体。通过研究孢子和粪粒，对这种现象的生态重要性进行了评估。藻类碎片排泄活粪球内有一些生态优势比自由繁殖。在潮间带栖息地，颗粒的粘性允许附着在基质上，同时保护所包含的藻类免受干燥。在潮下带生境中，小球下沉的速度比最快的藻类繁殖体快8-22倍。从粪便颗粒中的藻类碎片释放的蜂群和原生质体的定量表明约217个胚苗的密度。cm ~（-2），每团300-700个繁殖体。将这些结果外推到基于食草动物和颗粒数量的田间条件，表明产量数字在0.5-3.5 × 10 - 5之间变化。105至1.3-1.5倍。106 propagules. m-2.cntdot. 12小时这些值在田间沉降孢子的已知密度范围内。在食草动物密度增加和藻类正常繁殖活动减少的季节，这种现象的生态意义可能特别重要。
Benthic algae [Enteromorpha compressa] survive passage through the digestive tract of different types of grazers, [Siphonaria lessoni, Fissurella crassa] either regenerating new tissues or releasing protoplasts and swarmers which act as accessory means of reproduction to generate new individuals. The ecological importance of this phenomenon is evaluated here by studying spores and fecal pellets. Algal fragments egested alive inside fecal pellets have some ecological advantages over free propagules. In intertidal habitats, the sticky nature of the pellet permits attachment to the substratum while protecting the contained algae from desiccation. In subtidal habitats, the pellets sink 8-22 times faster than the fastest sinking algal propagule. Quantification of swarmers and protoplasts released from algal fragments in the fecal pellets indicates densities of about 217 germlings .cntdot. cm-2 and values of 300-700 propagules per pellet. Extrapolation of these results to field conditions based on number of grazers and pellets suggest production figures varying from 0.5-3.5 .times. 105 to 1.3-1.5 .times. 106 propagules .cntdot. m-2 .cntdot. 12 h-1. These values are within known density ranges of settling spores in the field. The ecological significance of the phenomenon may be especially important at seasons when the density of grazers increases and the normal reproductive activity of the algae being consumed decreases.