Mate guarding in relation to seasonal changes in the energy reserves of two freshwater amphipods (Gammarus fossarum and G. pulex)
Mate guarding in relation to seasonal changes in the energy reserves of two freshwater amphipods (Gammarus fossarum and G. pulex)
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DOI：
10.1111/fwb.12065
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发表时间：
2013-02-01
影响因子：
2.7
通讯作者：
Koop, Jochen H. E.
中科院分区：
文献类型：
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作者：
Becker, Jochen;Ortmann, Christian;Koop, Jochen H. E.
1.我们评估了性别特异性的季节性变化，主要能量储存化合物（甘油三酯，糖原）在钩虾fossarum和钩虾pulex从外地收集，就其生殖活动。2.储存的能量的动态遵循季节性模式在两个物种和性别。此外，在4年的时间里，这些变化与调查年份无关。贮能在冬末达到高峰，在夏末秋初耗尽，与繁殖期相吻合。3.甘油三酯（年平均值+/- SD）占总储存能量的79.7 +/- 11.9%，并负责季节性模式。相比之下，糖原贡献的百分比较小（20.3 +/- 11.9%）。在研究期间，储存的能量的量在0.39和4.08 kJ g-1干质量之间（甘油三酯：0.193.69 kJ g-1干质量;糖原：0.140.80 kJ g-1干质量）。4.在这两个物种中，男性的能量储备急剧耗尽前不久停止precopulatory交配守卫在外地，从而提供了一个生物能量的解释，在这两个广泛的物种的生殖期。
1. We assessed sex-specific seasonal changes in major energy storage compounds (triglycerides, glycogen) in Gammarus fossarum and Gammarus pulex collected from the field, with respect to their reproductive activity. 2. The dynamics of stored energy followed a seasonal pattern in both species and sexes. Moreover, over a 4-year period, these changes were independent of the year in which they were investigated. Stored energy reached a peak in late winter, but was depleted in late summer and early autumn, coinciding with the reproductive periods. 3. Triglyceride (annual mean +/- SD) accounted for 79.7 +/- 11.9% of the total stored energy and was responsible for the seasonal pattern. In contrast, glycogen contributed a lesser percentage (20.3 +/- 11.9%). Over the study period, the amount of stored energy ranged between 0.39 and 4.08 kJ g-1 dry mass (triglyceride: 0.193.69 kJ g-1 dry mass; glycogen: 0.140.80 kJ g-1 dry mass). 4. In both species, the energy reserves of males were drastically depleted shortly before the cessation of precopulatory mate guarding in the field, thus offering a bioenergetic explanation for the reproductive period in these two widespread species.