Population biology of the freshwater prawn Macrobrachium brasiliense (Heller, 1862) in the Middle Amazon Region, Brazil

Pub Date : 2019-01-02 DOI:10.1080/03946975.2018.1542195

L. D. de Oliveira, B. S. Sant’Anna, G. Y. Hattori

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引用次数: 7

Abstract

The population structure and reproduction of Macrobrachium brasiliense were studied with the aim of better understanding the ecology of this species in relation to the Amazonian flood-pulse regime. A total of 3,306 animals were caught monthly from August 2011 to July 2013 at the Carú River, Itacoatiara, Amazonas State (Brazil). The average carapace length of males (6.87 ± 3.45 mm) and females (6.88 ± 4.78 mm) did not differ significantly (U = 0.608; p= 0.5432) for the overall study period. The sex ratio was biased toward females (M:F = 1:1.61; χ2=83.855; p< 0.0001). The reproduction was continuous, and although juveniles were present throughout the study period, the recruitment occurred primarily during the ebb (August–September) and drought (October–December) periods. Macrobrachium brasiliense presents a low number of large eggs, and egg volume increased during embryogenesis, by 21.1% from Stage I to III. The population size-frequency distribution presented no correlation with the abiotic variables, but its reproductive period seems to be related to the Amazonian flood-pulse regime.

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巴西亚马逊河中部地区淡水对虾巴西沼虾(Heller, 1862)的种群生物学

研究了巴西沼虾的种群结构和繁殖，目的是更好地了解该物种与亚马逊洪水脉冲状态的生态关系。2011年8月至2013年7月，在亚马逊州（巴西）伊塔科蒂亚拉的Carú河每月共捕获3306只动物。雄性的平均甲壳长度（6.87 ± 3.45 mm）和雌性（6.88 ± 4.78 mm）没有显著差异（U = 0.608；p=0.5432）。性别比例偏向女性（M:F = 1:1.61；χ2=83.855；p＜0.0001）。繁殖是连续的，尽管在整个研究期间都有幼崽，但繁殖主要发生在低潮期（8月至9月）和干旱期（10月至12月）。巴西沼虾（Macrobrachium brasiliense）的大卵数量较少，胚胎发生过程中卵体积增加，从第一阶段到第三阶段增加了21.1%。种群大小频率分布与非生物变量无关，但其繁殖期似乎与亚马逊洪水脉冲状态有关。

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