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首页> 外文期刊>Marine ecology >Distribution, abundance, and growth of larval tautog, Tautoga onitis, in Buzzards Bay, Massachusetts, USA
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Distribution, abundance, and growth of larval tautog, Tautoga onitis, in Buzzards Bay, Massachusetts, USA

机译：美国马萨诸塞州秃鹰湾的幼虫幼虫的分布，丰度和生长

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摘要

Tautog, Tautoga onitis, is an abundant species of fish in estuaries of the northeastern United States. Planktonic tautog larvae are abundant in summer in these estuaries, but there is little information on rates of growth of tautog larvae feeding on natural assemblages of food in the plankton. We examined abundance and growth of larval tautog and environmental factors during weekly sampling at three sites along a nearshore-to-offshore transect in Buzzards Bay, Massachusetts, USA during summer 1994. This is the first study of a robust sample size (336 larvae) to estimate growth rates of field-caught planktonic tautog larvae feeding on natural diets, using the otolith daily-growth-increment method. The study was over the entire summer period when tautog larvae were in the plankton. The sampling sites contrasted in several environmental variables including temperature, dissolved oxygen (DO), and chlorophyll a concentration. There was a temporal progression in the abundance of tautog larvae over the summer, in relation to location and temperature. Tautog larvae were first present nearshore, with a pronounced peak in abundance occurring at the nearshore sites during the last 2 weeks in June. Larvae were absent at this time further offshore. From late June through August, larval abundance progressively decreased nearshore, but increased offshore although never approaching the abundance levels observed at the near-shore sites. The distribution and abundance of tautog larvae appeared to be related to a nearshore-to-offshore seasonal warming trend and a nearshore decrease in DO. Otoliths from 336 larvae ranging from 2.3 to 7.7 mm standard length had otolith increment counts ranging from 0 to 19 increments. Growth of larval tautog was estimated at 0.23 mm·day~(-1), and length of larvae prior to first increment formation was estimated at 2.8 mm indicating that first increment formation occurs 3-4 days after hatching at 2.2 mm. Despite spatial and temporal differences in environmental factors, there were no significant differences in growth rates at any of three given sites over time, or between sites. Because larval presence only occurred at a narrow range of temperature (17-23.5 ℃) and DO (6.5-9.3 mg·l~(-1)), in situ differences in growth did not appear to be because of differences in larval distribution and abundance patterns relative to these parameters.
机译：Tautog（Tautoga体炎）是美国东北部河口的一种丰富鱼类。在这些河口，夏季浮游性互变幼虫数量丰富，但是关于以浮游生物中的天然食物为食的互变幼虫的生长速度的信息很少。我们于1994年夏季在美国马萨诸塞州Buzzards湾的近岸到近海样带三个地点，每周采样期间检查了幼虫互变异构体的丰度和生长情况。这是在1994年夏季对健壮样本量（336个幼虫）进行的首次研究。用耳石的日增量法估算以自然饮食为食的田间捕捞的浮游互变互生幼虫的增长率。该研究是在整个夏季，当tautog幼虫在浮游生物中时。采样点在几个环境变量中形成对比，包括温度，溶解氧（DO）和叶绿素a浓度。与位置和温度有关，整个夏季的tautog幼虫数量随时间变化。 Tautog幼虫首先出现在近岸，在6月的最后两个星期内，近岸地点出现了明显的丰度峰值。幼虫此时不在远海。从6月下旬到8月，幼虫的丰度逐渐降低，但近海却增加，尽管从未达到近岸站点所观测到的丰度水平。互变异构幼虫的分布和丰度似乎与近岸到近海的季节变暖趋势和DO的近岸减少有关。 336个幼虫的耳石标准长度范围为2.3至7.7毫米，耳石增量计数范围为0至19增量。幼虫tautog的生长估计为0.23 mm·day〜（-1），幼虫在第一个增量形成之前的长度估计为2.8 mm，这表明第一个增量形成发生在孵化2.2 mm后3-4天。尽管环境因素在空间和时间上存在差异，但三个给定地点中的任何一个地点或地点之间的增长率均无显着差异。由于幼虫的存在仅在温度（17-23.5℃）和溶解氧（6.5-9.3 mg·l〜（-1））的较窄范围内发生，因此，原位生长差异似乎不是由于幼虫分布和分布的差异所致。相对于这些参数的丰度模式。

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