Growth of an acid-tolerant stonefly on epilithic biofilms from streams of contrasting pH
Growth of an acid-tolerant stonefly on epilithic biofilms from streams of contrasting pH
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DOI：
10.1046/j.1365-2427.2001.00764.x
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发表时间：
2001-11-01
影响因子：
2.7
通讯作者：
Hildrew, AG
中科院分区：
文献类型：
--
作者：
Ledger, ME;Hildrew, AG
1.显然没有一个专业的食草动物协会从许多酸流表明，藻类食草动物的联系在酸流食物网是薄弱或不存在。据推测，食草动物的缺乏是酸流中生物膜的低质量和/或数量的结果。比较了4条酸性河流和4条中性河流的石生生物膜的分类组成、生物量和潜在营养质量，并研究了食草动物--石生鱼（Nemurelapictetii）在4条酸性河流和4条中性河流的8种生物膜上的生长情况.酸性溪流和环中性溪流的生物膜在藻类组成上存在很大差异，前者的球状绿色藻类相对较多，而硅藻和丝状绿色藻类较少。硅藻植物区系不同的溪流水pH.4。生物膜的数量（即特定区域叶绿素含量、藻类数量和AFDM）和质量（生物量特定蛋白质和可溶性碳水化合物含量）在pH值相似的站点之间以及酸性和中性流组之间存在显著差异。N.毕赤酵母在生物膜上成功生长8-10周直至出苗。然而，没有系统的差异，发现两组之间的酸性和circumneutral流的增长率。从不同来源的底栖藻类的消化率的差异，以及若虫摄食率的调整，讨论了在缺乏一个明确的增长和食品质量之间的关系。
1. The apparent absence of a specialist herbivorous grazer guild from many acid streams suggests that algae-grazer linkages in acid-stream food webs are weak or absent. It has been hypothesized that the absence of herbivores is a consequence of the low quality and/or quantity of biofilms in acid streams.2. We compared the taxonomic composition, biomass and potential nutritional quality of epilithic biofilms from four acid and four circumneutral streams, and examined whether nymphs of a herbivore-detritivore, the stonefly Nemurella pictetii (Plecoptera: Nemouridae), could grow equally well when fed on eight biofilms from four acid and four circumneutral streams.3. Biofilms from acid and circumneutral streams differed strongly in algal composition, the former having relatively more coccoid green algae but fewer diatoms and filamentous green algae. Diatom floras differed with stream water pH.4. The quantity (i.e. area-specific chlorophyll content, algal numbers and AFDM) and quality (biomass-specific protein and soluble carbohydrate content) of biofilms differed significantly, both among sites of similar pH, and overall between the groups of acid and circumneutral streams.5. Nymphs of N. pictetii grew successfully on biofilms for 8-10 weeks up to emergence. However, no systematic differences in growth rate were found between the two groups of acid and circumneutral streams. Differences in the digestibility of benthic algae from different sources, and the adjustment of nymphal feeding rates, are discussed in the light of a lack of a clear relationship between growth and food quality.