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首页> 外文期刊>Lakes & Reservoirs >Spatial and temporal distribution of an invasive crayfish (Cherax quadricarinatus) in Lake Kariba, Zimbabwe
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Spatial and temporal distribution of an invasive crayfish (Cherax quadricarinatus) in Lake Kariba, Zimbabwe

机译：津巴布韦湖Kariba的入侵小龙虾（Cherax Quadricarinatus）的空间和时间分布

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摘要

Determining the extent of invasion by an aquatic invasive species is the first step toinforming effective management strategies. The spatial and temporal distribution ofan introduced invasive crayfish (Cherax quadricarinatus) in Lake Kariba, Zimbabwe wasinvestigated to determine the extent of the invasion. Five lakewide surveys across thefive basins of the lake (Sanyati; Bumi; Sengwa; Mlibizi; Binga) were conducted betweenMarch 2014 and July 2016. Monthly sampling for crayfish and physico-chemical parameterswas done in the Sanyati basin from January to December 2013. Presence/absence data from the lakewide surveys indicated that the crayfish had spread tothree of the five basins by July 2016; namely, the Sanyati, Bubi and Sengwa basins.There was a general decrease in the total and average number of crayfish caughtwith each consecutive lakewide survey. Out of 19 sampled sites in the Sanyati basin,crayfish were found to be present at 16 sites, including both protected and unprotectedareas, and in all substrate types (muddy, sandy and rocky substrates). Crayfishcatches differed significantly over time (months), with a general increase from Januaryand peaking in July, after which a decrease was observed until September before itsteadily increased again in December. Crayfish catches differed significantly amongthe sites in the Sanyati basin. Temperature and electrical conductivity significantlyaffected the CPUE of C. quadricarinatus, with an increase in both parameters being associatedwith a decreased CPUE (p < 0.05; Generalized Linear Mixed Models). The resultsof the current study indicate C. quadricarinatus is now in the spread stage of theinvasion process and is making use of all habitats in the lake. Increased trapping andcontainment to prevent further spread should be considered as management options.
机译：确定水生侵入物种的侵袭程度是第一步通知有效的管理策略。空间和时间分布津巴布韦湖Kariba湖的引入的侵入式小龙虾（Cherax Quadricarinatus）是调查以确定入侵的程度。五个湖面调查湖泊的五个盆地（三雅; Bumi; Sengwa; Mlibizi;宾果）在之间进行2014年3月和2016年7月。龙虾和物理化学参数的月度抽样在2013年1月至12月在三雅盆地完成。存在/来自湖面调查的缺席数据表明小龙虾蔓延到五零零六年七月三个盆地中有三个;即三籍星，博比和生长盆地。捕获的小龙虾总数和平均数量的一般减少每次连续湖面调查。在三幡盆地的19个采样的网站中，发现小龙虾在16个地点存在，包括保护和无保护地区，以及所有底物类型（泥泞，含沙和岩石基材）。小龙虾随着时间的推移（月份）捕获显着不同，一般从1月份增加7月份达到峰值，之后观察到在9月之前的减少12月再次稳步增加。小龙虾捕获在很大程度上不同三雅盆地的遗址。温度和电导率显着影响了C. Quadricarinatus的CPUE，随着两个参数的增加而增加CPUE减少（P <0.05;广义线性混合模型）。结果目前的研究表明，C. Quadricarinatus现在处于传播阶段入侵过程并正在利用湖中的所有栖息地。增加陷阱和遏制以防止进一步扩散应被视为管理选择。

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