Universidade Federal do Oeste do Pará (UFOPA), Laboratório de Ecologia do Ictioplâncton e Pesca em Águas Interiores (LEIPAI), Rua Vera Paz, s/n, Bloco 11, Sala 4, Salé, 68035-110 Santarém, PA, Brazil.
Programa de Pós-Graduação em Ecologia Aquática e Pesca (PPGEAP), Universidade Federal do Pará (UFPA), Cidade Universitária Prof. José Silveira Netto, Av. Augusto Corrêa, 1, Guamá, 66075-110 Belém, PA, Brazil.
An Acad Bras Cienc. 2022 Jan 7;94(1):e20201598. doi: 10.1590/0001-3765202220201598. eCollection 2022.
Many Amazonian fish' reproduction is associated to seasonality and to the conditions of habitat integrity. In a Neotropical floodplain lake of the Amazon region, the temporal structure of ichthyoplankton was investigated and the hypothesis that the density of fish eggs and larvae and the diversity of species vary between two areas with different levels of environmental changes occurred was tested. The sampling occurred monthly between September 2017 and August 2018. Six sampling stations were used, distributed in locations close to and far from the altered area. 195 eggs and 1,785 larvae from nine orders and 27 species were captured. The eggs were from non-migratory fish species and occurred during two moments. The larvae presented different abundance peaks during the sample months and all the initial stages of development occurred. Clupeiformes was the most abundant and Characiformes the species richest. The density of the ichthyoplankton and the diversity of species presented temporal variation. However, only the larval density varied between the areas of the lake. The Lake Juá is a spawning area for resident fish and is a nursery and growth area for larvae of species with different ecological categories and socioeconomic importance during different periods of the year.
许多亚马逊鱼类的繁殖与季节性和栖息地完整性的条件有关。在亚马逊地区的一个新热带洪泛区湖泊中，对仔鱼的时间结构进行了调查，并检验了这样一个假设，即鱼类卵和仔鱼的密度以及物种的多样性在两个环境变化程度不同的区域之间存在差异。采样于 2017 年 9 月至 2018 年 8 月期间每月进行一次。使用了六个采样站，分布在靠近和远离改变区域的位置。从九个目和 27 个物种中捕获了 195 个卵和 1785 个幼虫。这些卵来自非洄游鱼类物种，并且发生在两个时期。幼虫在样本月份呈现出不同的丰度峰值，并且所有的初始发育阶段都出现了。鲱形目是最丰富的，而脂鲤目是物种最丰富的。仔鱼的密度和物种多样性呈现出时间变化。然而，只有幼虫密度在湖的区域之间存在差异。Jua 湖是定居鱼类的产卵区，也是不同时期具有不同生态类别的和社会经济重要性的鱼类幼虫的育苗和生长区。
