Selective tidal stream transport of spot (Leistomus xanthurus Lacepede) and pinfish [Lagodon rhomboides (Linnaeus)] larvae: Contribution of circatidal rhythms in activity
Selective tidal stream transport of spot (Leistomus xanthurus Lacepede) and pinfish [Lagodon rhomboides (Linnaeus)] larvae: Contribution of circatidal rhythms in activity
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DOI：
10.1016/s0022-0981(97)00234-7
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发表时间：
1998-08-01
影响因子：
2
通讯作者：
Reinsel, KA
中科院分区：
文献类型：
--
作者：
Forward, RB;Tankersley, RA;Reinsel, KA
斑点鱼（Leistomus xanthusus Lacepede）和针鱼（Lagodon rhomboides Linnaeus）在近海产卵，它们的幼虫然后被运到岸上，在那里它们迁移到河口继续发育。本研究确定了（1）这些物种的幼虫是否使用选择性的潮汐流运输河口运动，以及（2）是否内源性的活动节奏有助于这种运动。现场研究确定了丰富的斑点和pinfish幼虫随着时间的推移在两个位置在潮汐河口有关的潮汐阶段和光暗周期。在一个位置，这两个物种是统计上最丰富的水柱在涨潮期间在夜间，这表明存在选择性的潮流运输。由于在其他位置的结果是不一致的，选择性的潮汐流输运河口运动的有效性不同的位置在河口。在实验室恒定条件下，测定了河口捕捞仔鱼活动的内源节律。这两个物种的周期长度接近一个潮汐周期和两个活动高峰在一个太阴日的昼夜节律。在大多数情况下，最大活动对应的时间在该领域的退潮。在选择性潮流运输过程中，增加的活动可能代表需要在水柱中保持低位或横向移动以减少落潮期间的水平运动的行为。在涨潮期间，幼虫可以被动地随河口上游的水流移动。(C)1998年Elsevier Science B.V.
Spot (Leistomus xanthusus Lacepede) and pinfish (Lagodon rhomboides Linnaeus) spawn offshore and their larvae are then transported shoreward where they migrate into estuaries for continued development. The present study determined (1) whether larvae of these species use selective tidal stream transport for up-estuary movement, and, (2) whether an endogenous rhythm in activity contributes to this movement. Field studies determined the abundance of spot and pinfish larvae over time at two locations in a tidal estuary as related to tidal phase and the light-dark cycle. At one location, both species were statistically most abundant in the water column during flood tide at night, which indicates the presence of selective tidal stream transport. Since results were inconsistent at the other location, the effectiveness of selective tidal stream transport for up-estuary movement varies with location in an estuary. Endogenous rhythms in activity of estuarine caught larvae were measured under constant conditions in the laboratory. Both species had circatidal rhythms with period lengths close to a tidal cycle and two activity peaks over a lunar day. In most cases maximum activity corresponded to the times of ebb tide in the field. During selective tidal stream transport, increased activity could represent the behavior needed to remain low in the water column or move laterally in order to reduce horizontal movements during ebb tides. During flood tides larvae could move passively with up-estuary directed currents. (C) 1998 Elsevier Science B.V.