一条接近原始的热带旱地河流中雌雄同体和雌雄同体鱼类群落的年代际变化

IF 1.6 3区 农林科学 Q3 FISHERIES
Karissa O. Lear, Brendan C. Ebner, Travis Fazeldean, Jeff Whitty, David L. Morgan
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引用次数: 1

摘要

淡水生态系统既具有令人难以置信的生物多样性,又在全球受到高度威胁。包括生境和流量在内的环境参数的变化可以实质性地影响河流水生群落内的许多生态过程,但这些参数与生态学之间的关系既没有得到很好的研究,也没有得到很好的理解。在高度变化的热带旱地河流系统中,评估这种关系需要在十年间的时间尺度上收集数据,而在短期内(包括选举和筹资周期)推动的发展计划中,通常不允许这样做。本文利用西澳热带旱地菲茨罗伊河(Fitzroy River) 18年的围网采样数据,分析了生境、季节性和湿季大小年际变化等环境和时间因素对旱地河流中水生物种群落组合结构、补充和生长的影响。结果表明,大生境(主河道vs洪泛平原小溪)、雨季降雨强度和由此产生的洪水都对生物群落产生了实质性影响,此外还有季节和昼夜变化。雨季洪水的强度(以河流流量衡量)对洪泛区溪流栖息地内的群落组成影响最大,并且是所调查的几种物种的新物种和成虫的补充率和生长的重要驱动因素。这项研究强调了保护旱地河流系统和组成生物群的关键考虑因素。具体来说,这些都是为了维持(a)每年的流量节律,(b)年之间的流量多样性,以及(c)各种栖息地类型,包括短暂的、半永久的和永久的浅层洪泛区和较深的主河道池,以支持各种各样的多面手和专门的双生和多生鱼类。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Inter-decadal variation in diadromous and potamodromous fish assemblages in a near pristine tropical dryland river

Inter-decadal variation in diadromous and potamodromous fish assemblages in a near pristine tropical dryland river

Freshwater ecosystems are both incredibly biodiverse and highly threatened globally. Variation in environmental parameters including habitat and flow can substantially affect many ecological processes within riverine aquatic communities, but the ties between such parameters and ecology are neither well studied nor understood. In highly variable tropical dryland river systems, assessing such relationships requires data collection over inter-decadal time scales, which is not typically permitted on development schedules driven over short periods (including election and funding cycles). Here, we used seine net sampling data collected over an 18-year period in the tropical dryland Fitzroy River, Western Australia, to assess how environmental and temporal factors including habitat, seasonality, and inter-annual variation in wet season magnitude affect the community assemblage structure, recruitment, and growth of aquatic species in dryland rivers. Results demonstrated that macrohabitat (main channel vs floodplain creek) and the magnitude of wet season rains and resultant flooding both had a substantial influence on biotic communities, alongside seasonal and diel variation. The magnitude of wet season flooding (measured as river discharge volume) had the greatest impact on assemblage composition within floodplain creek habitats and was a significant driver of recruitment rates and growth of recruits and adults of several species examined. This study highlights key considerations for conserving dryland river systems and constituent biota. Specifically, these are maintaining (a) rhythmicity of flow within each year, (b) diversity of flow volume between years, and (c) a variety of habitat types including ephemeral, semi-permanent, and permanent shallow floodplain and deeper main channel pools, in order to support a diverse array of generalist and specialist diadromous and potamodromous fishes.

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来源期刊
Ecology of Freshwater Fish
Ecology of Freshwater Fish 农林科学-海洋与淡水生物学
CiteScore
4.10
自引率
0.00%
发文量
45
审稿时长
12-24 weeks
期刊介绍: Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.
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