摘要
本研究通过对2010至2018年珠江下游肇庆江段广东鲂(Megalobrama terminalis)的生物资料调查,探究了其体长-体重关系以及肥满度及年龄结构年间变化趋势。结果表明,2010至2018年珠江下游肇庆段广东鲂种群的体长及5+龄以上个体占比率总体呈现下降趋势。2010至2018年珠江下游广东鲂种群体长-体重幂函数相关的条件因子a为0.011~0.004,异速生长因子b为2.816~3.261。广东鲂种群在2010、2011和2014年呈现负异速生长,而在2013及2015至2018年份表现出正异速生长。2010至2018年珠江下游广东鲂种群肥满度总体呈现出上升趋势。此外,2010至2018年珠江下游肇庆段日平均水温20℃以上天数占比率呈现逐渐上升趋势,而洪峰数量减少且相对集中。本研究发现广东鲂异速生长因子与日平均水温和径流量呈现一定线性正相关关系,揭示栖息地环境与广东鲂生长潜在的关联性。持续的高捕捞压力加快了广东鲂种群生长速度,并导致了该种群负异速生长。珠江禁渔期制度实施及其栖息地水温变化,可能是珠江下游广东鲂种群肥满度逐渐升高的原因。
[Objectives]The black Amur bream(Megalobrama terminalis)is an indigenous fish species,which has been identified to hold an important position in fishery production in the lower reaches of the Pearl River.This study aims to investigate the inter-annual variation on body length-weight relationship,Fulton’s condition factors(K)and age structure of M.terminalis population in the course of 2010-2018 in the downstream of Pearl River.[Methods]From 2010 to 2018,1785 specimens of M.terminalis were collected.Body mass and body length of all the samples were measured.In this study,we investigated the growth pattern of M.terminalis,basing on the body length,weight and age structure of M.terminalis.The power function of the body length and body weight relation equation:W=aL^(b) was used to compare the variation trend of M.terminalis from 2010 to 2018.SPSS software(version 19.0)was used for data processing.We examined significant differences between allometric growth parameters b and 3 by t test.Descriptive statistics was presented as mean±standard deviation(Mean±SD).[Results]The results indicated that there was a decreasing trend in body length and proportion of individuals over 5+years of M.terminalis population in Zhaoqing section of the Lower Pearl River from 2010 to 2018.Meanwhile,the body length-weight power function correlation condition factors(a)ranged from 0.011 to 0.004,and the value of allometric factor(b)ranged from 2.816 to 3.261 in the present study.M.terminalis population showed negative allometric growth in 2010,2011 and 2014,while positive allometric growth in 2013,2015-2018.The fatness of M.terminalis population presented a gradually increasing trend during 2010 to 2018.In addition,the proportion of daily average water temperature above 20℃ in ZhaoQing section of the Pearl River gradually increase,while the number of flood peaks decreased significantly and the distibution of flood peaks turned into intensively.Moreover,there was a positive relationship between allometric factor and water temperature an
作者
刘亚秋
李跃飞
李新辉
李捷
张辉
LIU Ya-Qiu;LI Yue-Fei;LI Xin-Hui;LI Jie;ZHANG Hui(Key Laborary of Freshwater Biodiversity Conservation,Ministry of Agriculture and Rural Affairs,Yangtze River Fisheries Research Institute,Chinese Academy of Fishery Sciences,Wuhan 430223;Pearl River Fisheries Research Institute,Chinese Academy of Fishery Sciences,Scientific Observing and Experimental Station of Fishery Resources and Environment in the Middle and Lower Reaches of Pearl River,Ministry of Agriculture and Rural Affairs,Guangzhou 510380,China)
出处
《动物学杂志》
CAS
CSCD
北大核心
2022年第5期732-741,共10页
Chinese Journal of Zoology
基金
广州市科技计划项目(No.202201010762)
农业农村部淡水生物多样性保护重点实验室开放课题(No.LFBC1006)
广东省基础与应用基础研究基金区域联合基金重点项目(No.2019B1515120064)
国家重点研发计划“蓝色粮仓科技创新”重点专项(No.2018YFD0900903)。
关键词
珠江
广东鲂
保护
生长
Pearl River
Megalobrama terminalis
Conservation
Growth
