Size and structure of the Mediterranean medicinal leech, Hirudo verbana populations inhabiting wetlands around Lake Eğirdir, Turkey

M. Ceylan, O. Çetinkaya
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引用次数: 3

Abstract

In the present study size and structure of the Mediterranean medicinal leech (Hirudo verbana Carena, 1820) populations inhabiting wetlands around Lake Eğirdir (Turkey) were investigated. Population size was estimated by removal methods, age classes were estimated for the first time in leeches (Hirudinea) using “Modal Progression Analysis” of body length frequencies using Bhattacharya's method. The population size and biomass of medicinal leeches around Lake Eğirdir were estimated to be 1,562,696 ± 805,613 leeches and 467.26 ± 172.91 kg, respectively. Three age classes were identified; the age group of 0+ was dominant with 78.6%. While 89.9% of the individuals weighed less than 1 g, whereas the broodstock was estimated to represent only 7%. Body weight, body length and condition factor were found to be 0.52 ± 1.19 g, 4.5 ± 2.4 cm and 0.620 ± 0.123, respectively. This study reveals that the population size of H. verbana in the wetlands around Lake Eğirdir is relatively well preserved and there is no significant threat to the sustainability of the exploitation of the medicinal leech populations. It is concluded that the stability of the lake's water budget, the variety and abundance of the host in the undamaged wetlands, the socioeconomic structure of the leech collectors, the sales policies, and the effective activities of conservation and control units might affect conservation status of the medicinal leech populations inhabiting wetlands around Lake Eğirdir.
地中海药用水蛭的大小和结构,居住在土耳其Eğirdir湖附近湿地的水蛭种群
本研究调查了居住在土耳其Eğirdir湖附近湿地的地中海药用水蛭(Hirudo verbana Carena, 1820)种群的大小和结构。采用去除法对水蛭种群规模进行估计,采用Bhattacharya法对水蛭体长频率进行“模态递进分析”,首次对水蛭的年龄等级进行估计。Eğirdir湖周边药用水蛭种群数量为1,562,696±805,613只,生物量为467.26±172.91 kg。确定了三个年龄组;0+年龄组占主导地位,占78.6%。而89.9%的个体体重不足1克,而据估计,亲鱼只占7%。体重为0.52±1.19 g,体长为4.5±2.4 cm,体质因子为0.620±0.123。研究结果表明,Eğirdir湖周边湿地水蛭种群规模保存较好,对药用水蛭种群的可持续性开发利用没有明显威胁。结果表明:湖泊水量平衡的稳定性、未受损湿地寄主的多样性和丰度、水蛭收集者的社会经济结构、销售政策以及保护和控制单位的有效活动可能会影响环湖湿地药用水蛭种群的保护状况Eğirdir。
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