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首页> 外文期刊>Aquatic Sciences >Flow-divergence feedbacks control propagule retention by in-stream vegetation: the importance of spatial patterns for facilitation
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Flow-divergence feedbacks control propagule retention by in-stream vegetation: the importance of spatial patterns for facilitation

机译：流量散度反馈控制流内植被对繁殖体的滞留：促进空间格局的重要性

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摘要

Facilitation (enhancement of propagule retention in this case) is increasingly recognized as an important driver of biodiversity, but it is still unknown if facilitation during dispersal and colonization is affected by self-organized spatial pattern formation. We investigated the ability of in-stream submerged macrophyte patches to trap the vegetative propagules of three species (Berula erecta, Groenlandia densa, Elodea nuttallii in two size classes: 13-22 and 40-48cm long), and to potentially benefit the colonization of these three species. We tested the effects of propagule traits, hydrodynamic forcing, and spatial patch configuration on propagule trapping. Propagule buoyancy was negatively correlated with trapping chance, while propagule size did not influence trapping. Species-specific differences in buoyancy were maintained for weeks after fragmentation. Propagule retention was interactive and conditional upon the interplay between incoming flow velocities and vegetation spatial patterning. In the flume experiment at low flows, a patchy configuration (one patch filling 66% of the flume width) retained more surface-drifting propagules (B. erecta, G. densa), than near-homogeneous cover (two patches close together, filling the entire flume width). In contrast, retention of sinking E. nuttallii propagules increased in the two-patch configurations. In flume and field releases where patches did not completely fill the channel width, water flowed around the patches rather than over or through them. This resulted in low-flow velocity areas within patches where canopies were upright and propagules were retained, and higher velocity flows around patches. In contrast, when vegetation filled the channel width, water could not be diverted laterally around the patches and preferentially flowed over them, causing the canopies to bend and reduce their trapping capacity. In flume experiments at high flows, retention of all species decreased, regardless of vegetation configuration, as propagules passed over the reconfigured vegetation canopies. These findings on the interplay of water movement and patch reconfiguration suggest that environmental heterogeneity generated by the self-organizing behavior of aquatic plants might enhance colonization of sessile organisms, calling for landscape-scale processes like dispersal to be better investigated.
机译：促进作用（在这种情况下，促进繁殖体的保留）日益被认为是生物多样性的重要驱动力，但在散布和定居过程中的促进作用是否受自组织的空间格局形成影响仍然未知。我们调查了河床中淹没的大型植物修补物捕获三种物种的营养繁殖体的能力（Berula erecta，Groenlandia densa，Elodea nuttallii分为两个大小类别：13-22和40-48cm长），并可能有益于这三个物种。我们测试了繁殖特性，水动力强迫和空间斑块配置对繁殖陷阱的影响。繁殖体的浮力与诱捕机会呈负相关，而繁殖体的大小并不影响诱捕。碎裂后几个星期，浮力的物种特异性差异得以维持。繁殖体的滞留是相互作用的，并取决于传入的流速与植被空间格局之间的相互作用。在低流量的水槽实验中，与近乎均质的覆盖物（两个小块靠在一起，填充）相比，斑块状结构（一个小块填充了66％的烟槽宽度）保留了更多的表面漂移繁殖体（B. erecta，G。densa）。整个水槽宽度）。相反，在两个补丁配置中，下沉的大肠杆菌的繁殖体的保留增加了。在不完全覆盖通道宽度的水槽和田间环境中，水流过补丁，而不是流过或流过补丁。这导致斑块内的低流速区域，其中冠层直立并保留了繁殖体，而斑块周围的流速较高。相反，当植被覆盖了整个河道宽度时，水无法在斑块周围横向转移并优先流过斑块，从而导致冠层弯曲并降低其捕获能力。在高流量的水槽实验中，由于繁殖体越过了重新配置的植被冠层，所有物种的保留都降低了，而与植被的配置无关。这些关于水运动和斑块重构相互影响的发现表明，水生植物自组织行为产生的环境异质性可能会增强固着生物的定殖，因此需要对像散布这样的景观尺度过程进行更好的研究。

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  • 来源
    《Aquatic Sciences》 |2019年第1期|17.1-17.16|共16页
  • 作者

    Cornacchia Loreta; van der Wal Daphne; van de Koppel Johan; Puijalon Sara; Wharton Geraldene; Bouma Tjeerd J.;

  • 作者单位

    Royal Netherlands Inst Sea Res NIOZ, Dept Estuarine & Delta Syst, POB 140, NL-4400 AC Yerseke, Netherlands|Univ Utrecht, POB 140, NL-4400 AC Yerseke, Netherlands|Univ Lyon 1, CNRS, ENTPE, LEHNA,UMR 5023, Villeurbanne, France|Univ Groningen, Groningen Inst Evolutionary Life Sci, POB 11103, NL-9700 CC Groningen, Netherlands;

    Royal Netherlands Inst Sea Res NIOZ, Dept Estuarine & Delta Syst, POB 140, NL-4400 AC Yerseke, Netherlands|Univ Utrecht, POB 140, NL-4400 AC Yerseke, Netherlands|Univ Twente, Fac GeoInformat Sci & Earth Observat ITC, POB 217, NL-7500 AE Enschede, Netherlands;

    Royal Netherlands Inst Sea Res NIOZ, Dept Estuarine & Delta Syst, POB 140, NL-4400 AC Yerseke, Netherlands|Univ Utrecht, POB 140, NL-4400 AC Yerseke, Netherlands|Univ Groningen, Groningen Inst Evolutionary Life Sci, POB 11103, NL-9700 CC Groningen, Netherlands;

    Univ Lyon 1, CNRS, ENTPE, LEHNA,UMR 5023, Villeurbanne, France;

    Queen Mary Univ London, Sch Geog, London, England;

    Royal Netherlands Inst Sea Res NIOZ, Dept Estuarine & Delta Syst, POB 140, NL-4400 AC Yerseke, Netherlands|Univ Utrecht, POB 140, NL-4400 AC Yerseke, Netherlands|Univ Groningen, Groningen Inst Evolutionary Life Sci, POB 11103, NL-9700 CC Groningen, Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Aquatic macrophytes; Bio-physical feedbacks; Stress divergence; Establishment; Flume tank; Hydrochory;

    机译：水生植物;生物物理反馈;应力发散;建立;水槽;水cho;

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