Species composition, biomass and primary production of benthic algae growing on the different types of substratum at the littoral area in the North basin of Lake Biwa, Japan

于2002年8月和11月对不同底质类型的底栖藻类的种类组成、生物量和初级生产力进行了测定，2011年3月和6月，2012年沿着沿岸的地区在北部盆地的琵琶湖。底栖藻类生物量在卵石和卵石覆盖的站位比砂覆盖的站位大。在砂质底质站位出现小型丝状绿色藻类，而在卵石、卵石和卵石底质站位则主要出现少数大型丝状绿色藻类。各站藻类群落结构相似，具有相似的底质属性。砂质底质站的同化数略高于卵石和卵石底质站。沿岸的海域底栖藻类的初级生产力、生物量和群落结构似乎受到底质性质差异的制约。

Measurements of species composition, biomass and primary production of benthic algae growing on different types of bottom substratum were conducted in Aug. and Nov., 2011, and Mar. and Jun., 2012 along the littoral area in the North basin of Lake Biwa. The biomass of benthic algae at the stations occupied with boulder and cobbles was larger compared to those with sand. At the sandy-substratum stations small filamentous blue-green algae appeared, on the other hand, a few large filamentous green algae dominantly appeared on the boulder, cobble and pebble-substratum stations. Each algal community structure resembled the other among the stations having similar bottom substratum property. The values of assimilation numbers of sandy-substratum stations were slightly higher than those of boulder and cobble-substratum stations. The primary production, biomass and community structure of benthic algae at the littoral area seems to be restricted by difference in the bottom substratum property.