Mating tactics in the sub-Antarctic deep-sea squid Onykia ingens (Cephalopoda: Onychoteuthidae)
Mating tactics in the sub-Antarctic deep-sea squid Onykia ingens (Cephalopoda: Onychoteuthidae)
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DOI：
10.1007/s00300-015-1856-z
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发表时间：
2016-07-01
期刊：
影响因子：
1.7
通讯作者：
Marian, J. E. A. R.
中科院分区：
文献类型：
--
作者：
Hoving, H. J. T.;Arkhipkin, A. I.;Marian, J. E. A. R.
人们对极地深海游泳生物的行为知之甚少。为了深入了解数量丰富且具有重要生态意义的亚南极深海鱿鱼 Onykia ingens 的交配行为，我们的目标是（1）量化精囊的产生； (2)确定精囊沉积的首选位置； (3)调查雄性和雌性O. ingens是否与多个配偶交配； (4)根据交配行为和卵子受精讨论植入精囊的位置。为此，我们检查了福克兰岛和新西兰水域的雄性和雌性 O. ingens 标本。雄性 O. ingens 在其生殖系统中储存多达 198 个精囊（平均 103 +/- A 61；n = 12），这些精囊是在相当长的体细胞生长（200-400 mm ML）时期产生的，并且可能具有相当大的尺寸范围。雄性可能通过漏斗将其长的可延伸末端器官插入雌性的外套腔中，以将精囊沉积在雌性身体上四个区域中的一个或多个区域。大多数植入的精囊（52.5%）在漏斗区域发现，但也有许多在靠近输卵管的外套腔内发现。因此，具有较长末端器官的雄性可能能够更靠近输卵管，受精机会高于位于漏斗区域的精囊。每个雌性个体植入的精原管数量（4-60，平均 29 +/- A 20；n = 24）、多区域精原管沉积以及精原管的不同外观表明雌性有多次交配事件。由于雄性在某一区域产生的精囊数量（最多 200 个）多于精囊数量（< 60 个），因此雄性也可能与不止一只雌性交配。我们展示了繁殖特征的定量评估如何能够深入了解目前缺乏现场观测的深海物种的繁殖行为。
The behavior of polar deep-sea nekton is very poorly known. To obtain insight into mating behavior of the abundant and ecologically important sub-Antarctic deep-sea squid Onykia ingens, our goals were to (1) quantify spermatophore production; (2) determine the preferred location for spermatangia deposition; (3) investigate whether male and female O. ingens mate with multiple mates; and (4) discuss the location of implanted spermatangia in light of mating behavior and egg fertilization. Toward this end, we examined male and female O. ingens specimens from Falkland Island and New Zealand waters. Male O. ingens store up to 198 spermatophores (mean 103 +/- A 61; n = 12) in their reproductive system, which are produced over a period of considerable somatic growth (200-400 mm ML), and which may have a considerable size range. Males insert their long extendible terminal organ in the mantle cavity of the female, potentially through the funnel, to deposit spermatophores in one or more of four regions on the female's body. Most implanted spermatangia (52.5 %) were found in the funnel region, but many were also found inside the mantle cavity closer to the oviducts. Males with longer terminal organs therefore may be able to position closer to the oviducts where fertilization chances are higher than for spermatangia located in the funnel region. The number of implanted spermatangia per individual female (4-60, mean 29 +/- A 20; n = 24), the multiregional spermatangia deposition, and the different outer appearance of spermatangia, suggested that females have multiple mating events. Since males produce more spermatophores (up to 200) than the number of spermatangia in one region (< 60), it is likely that males too mate with more than one female. We show how quantitative assessment of reproductive characteristics can provide insight into the reproductive behavior of deep-sea species for which in situ observations are currently lacking.