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Biotic factors determine ecosystem processes in environments with different hydrological regimes
Freshwater Biology ( IF 2.7 ) Pub Date : 2020-04-08 , DOI: 10.1111/fwb.13506 Rayanne Barros Setubal 1 , Ana Cristina Petry 2 , Cláudia Costa Bonecker 3 , Thiago Martins 4 , Clarice Casa Nova 1 , Marcos Paulo Figueiredo‐Barros 2 , Reinaldo Luiz Bozelli 1
中文翻译:
生物因素决定具有不同水文状况的环境中的生态系统过程
更新日期:2020-04-08
Freshwater Biology ( IF 2.7 ) Pub Date : 2020-04-08 , DOI: 10.1111/fwb.13506 Rayanne Barros Setubal 1 , Ana Cristina Petry 2 , Cláudia Costa Bonecker 3 , Thiago Martins 4 , Clarice Casa Nova 1 , Marcos Paulo Figueiredo‐Barros 2 , Reinaldo Luiz Bozelli 1
Affiliation
- The interest in understanding ecosystem functioning has grown in recent years due to the effects of species loss on ecosystem processes. Even though biotic and abiotic factors control ecosystem processes, their relative influence may vary according to ecosystem dynamics. In flood and coastal plains, these dynamics are mainly represented by flood pulses and hydroregime, respectively. The objective of this study was to investigate the importance of abiotic and biotic factors for the ecosystem processes represented by zooplankton secondary production (SP), biomass (ZB), and resource use efficiency (RUE) in lentic waterbodies subjected to different hydrological regimes. We hypothesised that abiotic factors would more strongly determine the ecosystem processes in temporary waterbodies and floodplain lakes, given their greater susceptibility to environmental changes. Biotic factors would be more relevant in coastal lagoons due to their greater temporal stability.
- Sampling was undertaken quarterly over 1 year in eight coastal lagoons, 10 temporary ponds and five floodplain lakes. The environments were characterised in relation to limnological variables, and zooplankton functional divergence, functional dispersion (FDis), functional evenness, functional richness, and taxonomic richness were measured. Analysis of variance (ANOVA) was used to verify seasonal changes in SP, ZB, RUE, functional diversity, richness, and abiotic factors. Linear mixed models were used to determine which abiotic and biotic factors were the most important for ZB, SP, and RUE.
- In the coastal lagoons, RUE differed over time. In the temporary ponds and floodplain lakes, no seasonal significant differences were observed for any of the zooplankton production variables. The linear mixed model analyses showed that models composed mainly of biotic factors were better fitted to the production variables. For coastal lagoons, phytoplankton density affected ZB, SP, and RUE increasing them by 9.9 mg DW/m3, 12.4 mg DW/m3, and 1.23, respectively. For temporary ponds, FDis lowered ZB by 6.9 mg DW/m3 and taxonomic richness increased SP and RUE by 14.2 mg DW/m3 and 1.17, respectively. For floodplain lakes, FDis lowered ZB it by 9.9 mg DW/m3 and functional divergence lowered RUE by 0.81.
- The present study demonstrates that biotic factors are the main determinants of ecosystem processes in neotropical lentic waterbodies, irrespective of their annual hydrological regimes. Complementarity effects and high functional diversity are more important in more stable environments, whereas redundancy and low functional diversity prevail in environments subject to more frequent environmental changes. Biotic factors play a major role in ensuring the functioning of aquatic ecosystems and indicate the important role of biodiversity in enabling ecosystem states to be maintained after disturbances and to prevent changes in ecosystem processes.
中文翻译:
生物因素决定具有不同水文状况的环境中的生态系统过程
- 近年来,由于物种丧失对生态系统过程的影响,人们越来越了解生态系统的功能。即使生物和非生物因素控制着生态系统过程,它们的相对影响也可能根据生态系统动态而变化。在洪水和沿海平原,这些动态主要分别由洪水脉冲和水文状况表示。这项研究的目的是调查非生物和生物因子对于受不同水文状况影响的胶体水体中浮游动物的次级生产(SP),生物量(ZB)和资源利用效率(RUE)所代表的生态系统过程的重要性。我们假设非生物因素会更强烈地决定临时水域和洪泛区湖泊的生态系统过程,鉴于他们对环境变化的敏感性更大。由于沿海泻湖的时间稳定性更高,因此其生物因素将更加相关。
- 在过去的一年中,每个季度在八个沿海泻湖,10个临时池塘和五个洪泛区湖泊中进行采样。对环境进行了语言学变量分析,并测量了浮游动物的功能差异,功能分散(FDis),功能均匀度,功能丰富度和分类学丰富度。方差分析(ANOVA)用于验证SP,ZB,RUE,功能多样性,丰富度和非生物因素的季节性变化。线性混合模型用于确定哪些非生物和生物因素对ZB,SP和RUE最重要。
- 在沿海泻湖中,RUE随时间变化。在临时池塘和洪泛区湖泊中,任何浮游动物生产变量均未观察到季节性显着差异。线性混合模型分析表明,主要由生物因子组成的模型更适合生产变量。对于沿海泻湖,浮游植物密度的影响ZB,SP,和RUE 9.9毫克DW /米增加他们3,12.4毫克DW /米3,和1.23,分别。对于临时池塘,FDis将ZB降低6.9 mg DW / m 3,分类丰富度将SP和RUE分别提高14.2 mg DW / m 3和1.17。对于洪泛区湖泊,FDis将ZB降低9.9 mg DW / m 3,功能差异使RUE降低0.81。
- 本研究表明,生物因子是新热带透镜体水体中生态系统过程的主要决定因素,无论其年度水文状况如何。互补效应和高功能多样性在更稳定的环境中更为重要,而冗余和低功能多样性则在环境变化更为频繁的环境中占主导地位。生物因素在确保水生生态系统功能方面发挥着重要作用,并表明生物多样性在使干扰后维持生态系统状态和防止生态系统过程发生变化方面的重要作用。