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首页> 外文期刊>Harmful Algae >Potential impacts of brown tide, Aureococcus anophagefferens, on juvenile hard clams, Mercenaria mercenaria, in the Coastal Bays of Maryland, USA
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Potential impacts of brown tide, Aureococcus anophagefferens, on juvenile hard clams, Mercenaria mercenaria, in the Coastal Bays of Maryland, USA

机译：潮汐对美国马里兰州沿海海湾的幼硬蛤Mer Mercenaria mercenaria的潜在影响

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摘要

The rate of growth of juvenile hard clams, Mercenaria mercenaria, was studied in the Coastal Bays of Maryland during an outbreak of the brown tide, Aureococcus anophagefferens. Brown tide dominated the plankton community during the month of June 2002, with cell densities at several sites reaching category 3 ( >200,000 cells ml~(-1)) levels. Temperatures during the bloom were 18.6-27.5℃. Nutrient conditions preceding and during the bloom were conducive for the proliferation of A. anophagefferens: while inorganic nitrogen and phosphorus were < 1 μg at N or P l~(-1), urea was elevated during bloom development. Organic nitrogen, phosphorus and carbon were in the range of levels observed in previous brown tide blooms and increased following the collapse of the bloom. Growth rates of juvenile clams were significantly lower during the period of the brown tide bloom than following its collapse. Growth rates of M. mercenaria were found to be negatively impacted at brown tide densities as low as 20,000 cells ml~(-1), or category 1 levels. The low growth rates of M. mercenaria could not be explained by temperature, as the lowest growth rates were found when water temperatures were at levels previously found to be optimal for growth.
机译：在棕潮爆发时，在马里兰州的沿海海湾研究了幼硬hard蛤cen（Mercenaria mercenaria）的生长速度。棕潮在2002年6月期间主导了浮游生物群落，一些地方的细胞密度达到3类（> 200,000个细胞ml〜（-1））水平。水华期间的温度为18.6-27.5℃。开花前和开花过程中的营养条件有利于嗜食曲霉的增殖：虽然氮或磷（-1）下无机氮和磷<1μg，但开花过程中尿素却升高了。有机氮，磷和碳在先前的褐潮大花中观察到的水平范围内，并随着大花崩塌而增加。褐潮开花期间，幼蛤的生长速度明显低于崩塌后。研究发现，在低至20,000个细胞ml〜（-1）或1类水平的褐潮密度下，美人蕉的生长速度受到不利影响。沙门氏菌的低生长率无法用温度来解释，因为当水温达到以前最适合生长的水平时，最低的生长率被发现。

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