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Daily and seasonal feeding rhythmicity of Palaemonetes varians (Leach 1814) from southwestern Europe

机译：欧洲西南部的古palamonetes varians（Leach 1814）的每日和季节性饲喂节律

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The feeding activity rhythm of Palaemonetes varians (Leach 1814) was studied by collecting stomachs over a 24-h cycle in four different seasons of 1996 and spring-summer of 1997 to assess a regulation of this behaviur dependent upon seasonal variations in photo-period length. A total of 6,692 stomachs were collected from a population reared in an extensive earthen pond located in the Guadalquivir Estuary salt marshes (Spain). Stomach fullness (f) classification was performed with a stereomicroscope by means of a four-point visual qualitative scale. Results showed that a high proportion of stomachs were empty in all seasons considered and a great variability in the data occurred irrespective of the time of the day. The number of full stomachs at each catch were represented over 24-h for each sampling season. Time series showed the occurrence of a feeding activity rhythm phased at day-night transitions. The sunset peak occurred in all months of sampling, while the sunrise one occurred in summer. Results are discussed in relation to available data on behavior, moulting, and reproduction of this and other species of the same genus.
机译：通过研究1996年和1997年春夏四个不同季节的24小时周期内收集胃来研究palamonetes varians（Leach 1814）的摄食活动节律，以评估该行为对光周期长度季节性变化的调节作用。 。在位于瓜达尔基维尔河河口盐沼（西班牙）的广阔土质池塘中饲养的种群中，总共收集了6,692个胃。用立体显微镜通过四点视觉定性量表对胃饱满度（f）进行分类。结果表明，在所有考虑的季节中，很大一部分胃都是空的，并且无论一天中的什么时间，数据的变化都很大。在每个采样季节的24小时内，每个捕获点的饱腹数量代表了24小时。时间序列显示出在昼夜过渡阶段分阶段出现的进食活动节奏。日落峰值出现在所有采样月份，而日出峰值出现在夏季。结合有关该属和其他属的行为，蜕皮和繁殖的可用数据讨论了结果。

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