...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine biology >Effects of spatial variability and colony size on the reproductive output and gonadal development cycle of the Mediterranean red coral (Corallium rubrum L.)
【24h】

Effects of spatial variability and colony size on the reproductive output and gonadal development cycle of the Mediterranean red coral (Corallium rubrum L.)

机译：空间变异性和菌落大小对地中海红珊瑚（Corallium rubrum L.）生殖输出和性腺发育周期的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Red coral (Corallium rubrum, L. 1758) is an over-exploited Mediterranean gorgonian. The gonadal development cycle of this gorgonian is examined at the Costa Brava (NW Mediterranean) taking into account for the first time colony size, depth and spatial horizontal variability. This study compares the gonad development and fertility in two colony size classes (colonies < 6-cm height, and > 10-cm height, both at 40-45-m depth), and two populations at different depths (16-18-m depth, and 40-45-m depth, both consisting of < 6-cm high colonies) in a 15-month period. The fertility of seven size classes (< 2 cm to > 12 cm high colonies, in 2 cm intervals) was examined in the deep population, where large colonies were present. Furthermore, reproductive output was compared in 6 populations (distributed along more than 70-km coastline) one month before spawning (June). Red coral was found to be dioecious and gonochoric with a sex ratio of 1:1, which differs from other NW Mediterranean populations. On the other hand, fertility of different size classes indicates that small colonies of 2-cm height already produce gonads, which is in line with previous studies. Female and male polyp fertility and sperm sac size increase significantly with colony size [sperm sac diameter: 476 ± 144 μm (mean ± SD) and 305 ± 150 μm in the > 10-cm and < 6-cm height colonies, respectively), whereas no significant effect on oocyte diameter was found (oocyte diameter: 373.7 ± 18.7 μm). Depth staggered spawning, that is, an earlier release of gonads in the shallow populations, was observed in summer 2003, coinciding with the highest temperature gradient between shallow and deep water during the study period. Colonies of < 6-cm height were significantly less fertile than colonies > 12 cm, thus the recommendation of this study is that a minimum height should be incorporated into fishing regulations. The six studied populations at the Costa Brava showed a comparable reproductive potential, which demonstrates little variability within the homogenous population structure and range of size classes (due to overharvesting) found at the Costa Brava. The study of reproductive output is an important tool for ecosystem management, and this work recommends basing specific exploitation laws for distinctive populations on colony size, which is found to have a larger effect on reproductive potential than mesoscale variability.
机译：红珊瑚（Corallium rubrum，L.1758）是过度开发的地中海戈尔戈尼亚人。在哥斯达黎加布拉瓦海岸（地中海西北部）检查了该龙虾的性腺发育周期，这是第一次考虑到了菌落的大小，深度和空间水平变异性。这项研究比较了两个菌落大小类别（高度<6厘米，高度> 10厘米的殖民地，都在40-45-m深度）和两个不同深度（16-18-m处）的性腺发育和繁殖力。深度和40-45-m的深度，均由15个月内的<6-cm高菌落组成。在存在大菌落的深部种群中，检查了七个大小等级（<2 cm至> 12 cm高菌落，以2 cm为间隔）的繁殖力。此外，在产卵前一个月（6月）比较了6个种群（分布在70多公里的海岸线上）的生殖产量。红珊瑚被发现是雌雄异体和淋病的，性别比为1：1，这与地中海西北地区的其他人群不同。另一方面，不同大小等级的育性表明2cm高的小菌落已经产生了性腺，这与以前的研究一致。雌性和雄性息肉的繁殖力和精囊大小随菌落大小而显着增加[高度> 10 cm和<6 cm的菌落中，精囊直径分别为476±144μm（平均值±SD）和305±150μm），而对卵母细胞直径没有显着影响（卵母细胞直径：373.7±18.7μm）。在2003年夏季观察到深度交错产卵，即性腺在较早种群中的释放较早，这与研究期间浅水和深水之间的最高温度梯度相吻合。高度小于6厘米的菌落的繁殖力明显小于大于12厘米的菌落，因此本研究的建议是，将最低高度纳入捕捞法规。在布拉瓦海岸进行的六个研究种群显示出可比较的繁殖潜力，这表明在布拉瓦海岸发现的同质种群结构和大小分类范围（由于过度收获）几乎没有变化。生殖产出的研究是生态系统管理的重要工具，这项工作建议针对特定种群的特定剥削规律建立在种群规模的基础上，发现其对生殖潜力的影响要比中等规模的变化更大。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号