Krasnov B, Shenbrot G, Khokhlova I, Medvedev S, Vatschenok V
Ramon Science Center, Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Mizpe Ramon, Israel.
J Med Entomol. 1998 May;35(3):303-13. doi: 10.1093/jmedent/35.3.303.
Flea assemblages of Meriones crassus Sundevall and Gerbillus dasyurus Wagner in different habitats in the Negev Highlands of Israel were studied to determine how flea abundance and species composition on the same host change among habitats, and the environmental parameters determining specific composition of flea assemblage. Fleas of the same species parasitizing different hosts responded differently to the same set of environmental variables. Spatial distribution of fleas on M. crassus was determined by environmental parameters significantly stronger than those on G. dasyurus. Flea abundance and species composition on both host species changed among habitats. Indirect ordination of flea assemblages produced axes that presented spatial components of change in flea composition (for M. crassus--Xenopsylla conformis Rothschild versus Xenopsylla ramesis Rothschild; for G. dasyurus--Xenopsylla dipodilli Smit versus X. conformis and X. ramesis versus X. conformis). Discriminant analyses of flea assemblage on M. crassus demonstrated that fleas were segregated along 2 discriminant axes that reflected a soil structure and productivity gradient and a contrast between dry riverbeds and watershed plains. Ordination of flea assemblages on G. dasyurus produced 2 discriminant axes, both presenting a complex gradient of the soil structure and the level of primary production.
对以色列内盖夫高地不同栖息地的肥尾心颅跳鼠（Meriones crassus Sundevall）和蓬尾沙鼠（Gerbillus dasyurus Wagner）身上的跳蚤群落进行了研究，以确定同一宿主身上的跳蚤丰度和物种组成如何在不同栖息地间变化，以及决定跳蚤群落特定组成的环境参数。寄生于不同宿主的同一物种跳蚤对同一组环境变量的反应不同。肥尾心颅跳鼠身上跳蚤的空间分布受环境参数的影响明显强于蓬尾沙鼠身上的跳蚤。两种宿主物种身上的跳蚤丰度和物种组成在不同栖息地间均有变化。跳蚤群落的间接排序产生的轴呈现出跳蚤组成变化的空间成分（对于肥尾心颅跳鼠——罗氏客蚤（Xenopsylla conformis Rothschild）与拉氏客蚤（Xenopsylla ramesis Rothschild）；对于蓬尾沙鼠——双蚤客蚤（Xenopsylla dipodilli Smit）与罗氏客蚤，以及拉氏客蚤与罗氏客蚤）。对肥尾心颅跳鼠身上跳蚤群落的判别分析表明，跳蚤沿着2个判别轴被区分开来，这两个轴反映了土壤结构和生产力梯度以及干涸河床与流域平原之间的差异。对蓬尾沙鼠身上跳蚤群落的排序产生了2个判别轴，二者均呈现出土壤结构和初级生产水平的复杂梯度。
