An empirical test of bet-hedging polyandry hypothesis in the field cricket Gryllus bimaculatus
An empirical test of bet-hedging polyandry hypothesis in the field cricket Gryllus bimaculatus
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田间蟋蟀对冲一妻多夫假说的实证检验
DOI：
10.1007/s10164-021-00707-0
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发表时间：
2021
影响因子：
0.9
通讯作者：
Yamamoto Yuto
中科院分区：
文献类型：
--
作者：
Yasui Yukio;Yamamoto Yuto
理论表明，一妻多夫制（在一个繁殖季节与多个雄性交配）起到了对冲作用，可以提高一妻多夫基因型几代人的几何平均适应性（GMF）并避免灭绝，但很少经过实证检验。在本研究中，我们将与1-4只雄性（交配处理）交配的雌性双斑蝼蛄的卵分配到4个不同条件的培养皿中：25℃/淡水、37℃/淡水、25℃/盐水、37℃/盐水，模拟不同地点产下的4窝幼虫遭受的环境变化。卵孵化率是通过 7 个区块的不同雌性每次交配处理获得的。一般来说，在 25°C 下孵化的卵明显多于在 37°C 下孵化的卵，在淡水中孵化的卵明显多于盐水中。繁殖失败（每个培养皿没有孵化出的卵）经常发生在单雄和二雄一妻多夫中。接下来，我们将 7 个区块视为连续 7 个虚拟世代，并计算相同处理的雌性之间的代内算术平均适应度 (AMF) 以及 AMF 跨 7 个世代的代间 GMF。随机化检验表明，3雄和4雄一妻多夫的GMF显着高于一夫多妻制。这项研究表明，一妻多夫交配作为赌注对冲可以避免只交配一次的风险。
Theory shows that polyandry (mating with multiple males within a reproductive season) works as bet-hedging to increase the geometric mean fitness (GMF) of polyandrous genotype over generations and avoid extinction but it was rarely tested empirically. In this study, we distributed the eggs ofGryllus bimaculatusfemales mated with 1–4 males (mating treatment) into 4 petri dishes with different conditions: 25 °C/fresh water, 37 °C/fresh water, 25 °C/salt water, 37 °C/salt water, simulating 4 clutches laid at the different sites are suffered environmental change. The egg hatching rate was obtained over 7 blocks with different females for each mating treatment. In general, significantly more eggs hatched in 25 °C than 37 °C and in fresh water than salt water. The reproductive failure (no hatched eggs per petri dish) frequently occurred in monandry and 2-male polyandry. Next, we considered 7 blocks as the successive 7 virtual generations and calculated the within-generation arithmetic mean fitness (AMF) among females of the same treatment and the between-generation GMF of the AMF across 7 generations. Randomization test shows that the GMF of 3- and 4-male polyandry were significantly higher than monandry. This study shows that the risk from mating only once can be avoided by polyandrous mating as bet-hedging.
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