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首页> 外文期刊>Estuarine Coastal and Shelf Science >Marshes as sources or sinks of an estuarine mysid: demographic patterns and tidal flux of Neomysis kadiakensis at China Camp marsh, San Francisco estuary
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Marshes as sources or sinks of an estuarine mysid: demographic patterns and tidal flux of Neomysis kadiakensis at China Camp marsh, San Francisco estuary

机译：沼泽作为河口类蝇眼的源或汇：旧金山河口中国营沼泽地上的Nediasis kadiakensis的人口统计学特征和潮汐通量

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摘要

The population characteristics, seasonal abundance and tidal flux of Neomysis kadiakensis were studied to determine if tidal marshes serve as sources or sinks for mysids in China Camp, located in the San Francisco estuary. Monthly surveys of the zooplankton community were conducted during spring tide periods between May 2002 and May 2003, using a fyke net (500 μm mesh) fixed at the mouth of a fourth order tidal channel system in a tidal marsh. Mysids were collected and preserved hourly throughout full tidal cycles. Neomysis kadiakensis was the dominant mysid species, comprising 94-100% of mysids throughout the year. Monthly mean abundance of N. kadiakensis ranged from 14 mysids m~(-3) in January 2003 to 244 mysids m~(-3) in March 2003. Length frequency distributions indicated that reproduction and recruitment were nearly continuous, with abundance peaks occurring throughout the year (e.g., spring, summer and early fall). The resulting flux estimates during this period suggested that China Camp marsh was a sink for N. kadiakensis. The mean daily (ca. 24.8 h) fluxes of N. kadiakensis corresponded to an instantaneous daily population mortality rate within the marsh channel of 0.29 d~(-1). Although all sizes and stages experienced a net import to the marsh, a significant positive relationship was observed between mysid length and mean annual flux, indicating that larger, mature mysids experienced a greater degree of tidal import to the marsh than smaller, juvenile mysids. These analyses suggest that size-specific predation, perhaps from fishes, shrimp, and/or birds may have had a disproportionate impact on large, mature mysids. Mortality rates in the marsh greatly exceeded the overall population growth rates, indicating that predation pressure on mysids was greater in the marsh than in the subtidal estuary. Mysids, therefore, supply a net flux of energy from the subtidal estuary to the marsh during spring tide series; however, the ultimate fate of this energy is unknown (remaining within the marsh system vs. export back to the estuary via trophic relay or other processes).
机译：研究了Kadiakensis Neomysis kadiakensis的种群特征，季节性丰度和潮汐通量，以确定潮汐沼泽是否是旧金山河口中国营地中的寄生虫源或汇。在2002年5月至2003年5月的春季潮汐时期，对浮游动物群落进行了每月调查，使用的是固定在潮汐沼泽中四级潮汐通道系统口处的鱼网（500μm网眼）。在整个潮汐周期中，每小时收集并保存一次类麻疹。 kadiakensis Neomysis kadiakensis是主要的类蝇s种类，一年中占94-100％。卡迪亚克猪笼草的月平均丰度范围从2003年1月的14个麦芽孢子m〜（-3）到2003年3月的244个麦芽孢子m〜（-3）。长度频率分布表明繁殖和募集几乎是连续的，在整个过程中都出现了丰度峰值。一年（例如，春季，夏季和初秋）。在此期间得出的通量估算值表明，中国营地沼泽是卡迪亚克猪笼草的汇。卡迪亚克猪笼草的平均每日通量（约24.8 h）对应于沼泽通道内0.29 d〜（-1）的瞬时每日人口死亡率。尽管所有大小和阶段的沼泽都有净输入，但在象鼻虫长度和平均年通量之间却观察到显着的正相关，这表明，较大的，成熟的象鼻虫比较小的少年类象鼻虫更容易进入潮汐。这些分析表明，可能来自鱼类，虾类和/或鸟类的特定大小的捕食对大型成熟的甲壳类动物有不成比例的影响。沼泽中的死亡率大大超过了总体人口增长率，这表明沼泽中的蛇毒对捕食的压力大于潮下河口。因此，在春季潮汐系列中，Mysids从潮下河口到沼泽提供了净能量通量；然而，这种能量的最终命运是未知的（保留在沼泽系统中，还是通过营养传递或其他过程运回到河口）。

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