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在巴西里约热内卢的一个沿海湖中与侵入性白虫 (Mytilopsis leucophaeata) 发生的Brachidontes darwinianus (Mytilidae) 种群动态

Antonio J S Rodrigues^1,2,3, Gabrielle M D Gomes³, Raquel A F Neves^1,2

¹Universidade Federal do Estado do Rio de Janeiro (UNIRIO), Instituto de Biociências (IBIO), Programa de Pós-Graduação em Biodiversidade Neotropical (PPGBIO), Avenida Pasteur, 458, Urca, 22290-240 Rio de Janeiro, RJ, Brazil.

Anais da Academia Brasileira de Ciencias

|August 20, 2025

概括

在里约热内卢的湖, 尽管本地种群的数量正在上升,但侵入性白虫 (Mytilopsis leucophaeata) 的数量仍在增加,这表明它们有可能共存.

科学领域:

海洋生物学
生态学
侵入性物种研究

背景情况:

在里约热内卢的罗德里戈·德·弗雷塔斯湖,本土的双鱼 (Brachidontes darwinianus) 与侵入性的白虫 (Mytilopsis leucophaeata) 共同存在.
这两种物种都生活在硬质基板上, 在湖生态系统中形成密集的群体.

研究的目的:

评估本地双鱼B. darwinianus的种群动态,包括生长率和死亡率.
将这些种群参数与同一湖内入侵性M. leucophaeata的现有数据进行比较.
在城市沿海环境中研究本地和入侵双动物的共存动态.

主要方法:

在连续两年 (2016-2017年和2017-2018年) 收集和分析B. darwinianus种群数据.
两个研究年间的增长率 (K) 和总死亡率 (Z) 的比较分析.
在B. darwinianus和M. leucophaeata种群之间的密度比较.

主要成果:

在这两年中,B. darwinianus的生长率 (K) 保持在0.5的水平.
对B. darwinianus的总死亡率略有增加,从2016-2017年的2.25增加到2017-2018年的2.9.
M. leucophaeata的密度明显高于B. darwinianus的密度,尽管本地双密度在第二年呈现上升趋势.

结论:

本地双鱼B. darwinianus表现出稳定的生长,但在研究的城市湖中面临着日益增加的死亡率.
尽管侵袭性M. leucophaeata占主导地位,但B. darwinianus的密度上升表明共存的可能性.
进一步的研究至关重要,以了解已建立的入侵性双鱼对湖底层社区的生态相互作用和影响.

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