Spatial and temporal complexities of reproductive behaviour and sex ratios of two harpacticoid species Canuella perplexa Scott T. & Scott A., 1893 and Bryocamptus sp. were evaluated monthly from September 2007 to August 2008. Collections were made from four ponds at different salinities in the solar saltern of Sfax, Tunisia, considering other environmental features as well. The salinities ranged from 38.0 to 86.1 psu. With rising salinity, the abundance of C. perplexa adults declined from 4550 ± 4160 ind m⁻³ (pond A1, salinity = 41.5 ± 2.3 psu) to 880 ± 780 ind m⁻³ (pond C31, salinity = 71.0 ± 4.3 psu). The abundance of Bryocamptus sp. adults increased from 3560 ± 2810 ind m⁻³ (A1) to 10,080 ± 6890 ind m⁻³ (C31). The abundance of total adults of C. perplexa was negatively correlated with both salinity (r = − 0.441, n = 18, p < 0.05) and abundance of dinoflagellates (r = − 0.291, n = 18, p < 0.05) and positively correlated with suspended matter (r = 0.389, n = 18, p < 0.05), temperature (r = 0.354, n = 18, p < 0.05), and abundance of diatoms (r = 0.410, n = 18, p < 0.05). The abundance of adults of Bryocamptus sp. displayed only a positive correlation with salinity (r = 0.452, n = 18, p < 0.05). In both species, the sex ratio (males/females) was driven by the variability of female abundance but never exceeded 1.0. For C. perplexa, the egg number per female ranged between 28 and 31; the ovisac length was between 0.39 ± 0.002 and 0.45 ± 0.018 mm. The egg diameter ranged from 0.062 ± 0.001 to 0.065 ± 0.002 mm, and the total length of ovigerous females ranged between 1.2 and 1.35 mm. For Bryocamptus sp., the egg number per female ranged between 19 and 22, the ovisac length between 0.28 ± 0.008 and 0.31 ± 0.003 mm, the egg diameter between 0.041 ± 0.001 and 0.044 ± 0.001 mm, and the total length of ovigerous females between 0.6 and 0.74 mm. The outcome of this study demonstrated that under extreme environmental conditions and increasing salinity the percentage of diatoms and dinoflagellates was found to be an essential factor in controlling the abundance and reproduction traits of both harpacticoids in this study. Furthermore, the sex ratios in these harpacticoid populations are complex as many factors can influence and alter the sex ratios in natural populations.

中文翻译：

---

盐度梯度增加下两种类拟actic足类足类的丰度和繁殖变量

两种类拟螺物种Canuella perplexa Scott T.＆Scott A.，1893和Bryocamptus sp。的生殖行为的时空复杂性和性别比。从2007年9月至2008年8月，每月进行评估。从突尼斯Sfax太阳盐湖的四个盐度不同的池塘收集鱼，同时考虑其他环境特征。盐度范围为38.0至86.1 psu。随着盐度的升高，多年生梭菌成虫的丰度从4550±4160 ind m ^-3（池塘A1，盐度= 41.5±2.3 psu）下降到880±780 ind m ^-3（池塘C31，盐度= 71.0±4.3 psu） 。丰富的Bryocamptus sp。成人从3560±2810 ind m^-3（A1）至10,080±6890 ind m ^-3（C31）。的总成人的丰度C. perplexa呈负二者盐度（相关- [R  - 0.441，= Ñ  = 18，p 和丰盈甲藻<0.05）（- [R  = - 0.291，Ñ  = 18，p  <0.05）的正相关悬浮物（r  = 0.389，n  = 18，p  <0.05），温度（r  = 0.354，n  = 18，p  <0.05）和硅藻的丰度（r  = 0.410，n  = 18，p <0.05）。成年的Bryocamptus sp。盐度仅显示出正相关（r  = 0.452，n  = 18，p  <0.05）。在这两个物种中，性别比（男性/女性）均受女性丰度变化的驱动，但从未超过1.0。对于C. perplexa，每只雌性的卵数在28至31之间。卵泡长度在0.39±0.002和0.45±0.018毫米之间。卵的直径范围为0.062±0.001至0.065±0.002 mm，卵生雌性的总长度为1.2至1.35 mm。对于Bryocamptussp。，每个雌性的卵数在19到22之间，卵腔长度在0.28±0.008和0.31±0.003毫米之间，卵的直径在0.041±0.001到0.044±0.001 mm之间，卵子雌性的总长度在0.6到0.5mm之间。 0.74毫米 这项研究的结果表明，在极端环境条件下和盐度增加的情况下，本研究发现硅藻和鞭毛鞭毛藻的百分比是控制两种类类拟南芥的丰度和繁殖性状的重要因素。此外，由于许多因素会影响和改变自然种群中的性别比例，因此这些类拟螺类动物种群中的性别比例很复杂。