高木 俊

<p> 近年国内の浅い富栄養湖のいくつかでヒシ属植物の増加が報告されている。本研究では，オニビシの繁茂が水質に与える影響を明らかにするために，印旛沼においてオニビシが繁茂する地点（オニビシ帯）としない地点（開放水面）の水質を比較した。繁茂期（7月から9月）のオニビシ帯は，開放水面に比べ溶存酸素濃度および濁度が有意に低かった。溶存酸素濃度の低下は夜間と底層で顕著であり，無酸素状態になることもあった。濁度はオニビシが繁茂している時期にオニビシ帯の表層と底層両方で低くなった。オニビシ帯では，浮葉...

<p>We investigated the spatial distribution of macrobenthos in salt marshes along the coast of Tokyo Bay, with environmental factors that influence their distribution. The field survey was conducted at 31 sites along the entire coast of the bay, i...

Invasions of some areas of Japan by the exotic redback spider Latrodectus hasseltii Thorell (Araneae: Theridiidae) have been reported. While most of these invasions have occurred in urban areas, anthropogenic habitat modifications may provide an o...

Despite recent attempts to quantify the relative strength of density- and trait-mediated indirect effects, rarely has the issue been properly addressed at the population level. Most research is based on short-term small-scale experiments in which ...