Interconnectedness during high water maintains similarity in fish assemblages of island floodplain lakes in the Amazonian Basin
Interconnectedness during high water maintains similarity in fish assemblages of island floodplain lakes in the Amazonian Basin
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DOI：
10.1590/s1984-46702010000600014
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发表时间：
2010-01-01
期刊：
影响因子：
--
通讯作者：
Santos, Ivanildo L.A.
中科院分区：
文献类型：
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作者：
Freitas, Carlos Edwar de C.;Siqueira-Souza, Flávia K.;Santos, Ivanildo L.A.
我们进行了一项研究，以测试的假设，岛屿洪泛区湖泊和相邻的索利莫伊斯河在洪水阶段的水文循环之间的相互联系是足以保持鱼类物种组合的相似性。在丰水期和枯水期连续三年（2004年7月至2006年7月），在四湖上收集刺网样品的乌布岛。两个湖，Piranha和Ressaca，全年都与河流相连，另外两个位于岛中心的Preto和Cacau在低水位期间被隔离。这些湖泊中鱼类群落的丰度、物种丰富度和均匀度并没有因其相对位置或水文循环季节而有所不同，这证实了我们的假设。然而，旱季的鱼类丰度高于汛期。显然，湖泊之间完全连通的短暂时间足以让所有鱼类定居，但不会造成类似的丰度。我们的研究表明，岛屿洪泛区湖泊的物种组成的持久性，主要是由于每年的鱼类补充到湖泊在汛期。
We conducted a study to test the hypothesis that interconnectedness among island floodplain lakes and the adjacent Solimoes River during the flood stage of the hydrologic cycle is enough to maintain similarity in fish species assemblages. Gill net samples were collected during high and low water periods for three consecutive years (July 2004 to July 2006) in four lakes on Paciencia Island. Two lakes, Piranha and Ressaca, are connected to the river all year, and the other two, Preto and Cacau, which are in the center of the island, are isolated during low water periods. The abundance, species richness and evenness of the fish assemblages in these lakes did not differ according to their relative positions or the season of the hydrological cycle, which confirmed our hypothesis. However, fish abundance during the dry season was greater than in the flood season. Apparently, the short period of full connection between the lakes is enough to allow the colonization of all fish species, but not to cause similar abundances. Our study indicates that persistence of the species composition of island floodplain lakes is primarily due to the annual replenishment of fish to the lakes during the flood season.