福岡市周辺の海産生物調査(1)博多湾の海藻・海草類
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The seaweeds and seagrasses growing in the Hakata Bay were bimonthly investigated at the six localities (Karadomari, Imadzu, Myoken-Misaki, Makinohana, southern Shikanoshima and northern Shikanoshima) from April 2006 to February 2007. Totally, 112 seaweeds (14 Chlorophyceae, 37 Phaeophyceae and 61 Rhodophyceae) and 2 seagrasses were found. The number of species found at the localities was greatly reduced toward the inside of the Bay. The reduction was conspicuous in Phaeophyceae and Rhodophyceae, particularly in large Phaeophyceae (Laminariaceae and Sargassaceae). This seemed to reflect the higher degree of eutrophication in the inner part of the bay. A comparison was made between the result in this study and that obtained just ten years ago. Almost no difference was found in the number of seaweed and seagrass species at each locality, and as a whole a similar biodiversity was recognized. We suppose that the result corresponds with the water quality that remained unchanged during these ten years.2006年4月から2007年2月まで2ヶ月毎に計6回,博多湾内6地点（唐泊,今津,妙見岬,牧の鼻,志賀島南部,志賀島北部）において,海藻・海草類の生育種類数調査を行った.6地点合わせて海藻類112種（緑藻綱14種,褐藻綱37種,紅藻綱61種）,海草類2種の計114種であり,その生育種数は湾奥ほど減少した.その減少は褐藻綱,紅藻綱で明瞭であり,特に大型褐藻綱（コンブ科,ホンダワラ科）で顕著であった.このことは,湾奥ほど富栄養化の程度が高いことの反映であると考えられた.10年前の同様の調査と比較したところ,各地点での生育種数に特に大きな変化は見られず,湾全体として10年前とほぼ同程度の種多様性が認められた.これは,博多湾の水質環境がこの10年間で特に大きく変化しなかったことによるものと推察された.