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キューバ北西部の水質勾配に沿った八頭類群集の時空間変化．
Spatio temporal variation in octocoral assemblages along a water quality gradient in the northwestern region of Cuba.
PMID: 32275537 DOI: 10.1016/j.marpolbul.2020.110981.
抄録
河川は沿岸域への栄養塩の主な供給源である。そこで、キューバ北西部の河川流域に近い岩礁において、水質悪化がオクトコア群集に及ぼす影響と微生物学的・物理化学的変数との関係を調査した。評価は13の前礁において水深10mの1mフレームで実施した。その結果、河川流域付近のサンゴ礁では、微生物学的変数や水質化学物質の濃度が最も高く、水柱内の水平方向の可視性が最も低いことがわかった。また、豊富さ、多様性、八頭体密度が最も低かったのは、糞便性大腸菌、総大腸菌、糞便性連鎖球菌の濃度が高いこと、底質への堆積物の蓄積、水柱の視認性の低下と関連していた。また，糞便性有機物汚染により，八頭体群集の構造は岩礁間で大きく異なっていた。河川流域付近のサンゴ礁では，水質悪化が八頭体群集に悪影響を与えていると考えられる。
Rivers are the main sources of nutrients to coastal zones. Therefore, the effects of water quality degradation on octocoral assemblages and their relationship with microbiological and physical-chemical variables were determined in reefs close to river basins in the northwestern region of Cuba. The evaluations were carried out in 1 m frames at a depth of 10 m in 13 fore reefs. The highest concentrations of the microbiological variables and hydrochemicals and the lowest horizontal visibility in the water column were detected in the reefs near the river basins. The lowest richness, diversity and octocoral density were related to higher concentrations of fecal coliform, total coliform and fecal streptococcal bacteria, sediment accumulation on the bottom and lower visibility. The structure of the octocoral assemblages varied significantly between reefs due to fecal organic pollution. Water quality deterioration in the reefs near the river basins has negatively affected the octocoral assemblages.
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