Variation in hydrochory among lakes and streams: Effects of channel planform, roughness, and currents

Sammanfattning

The configuration of channels in stream networks is vital for their connectivity, biodiversity, and metacommunity dynamics. We compared the capacity of three process domains-lakes, slow-flowing reaches, and rapids-to disperse and retain plant propagules by releasing small wooden cubes as propagule mimics during the spring flood and recording their final locations. We also measured the geomorphic characteristics (planform, longitudinal profile, cross-sectional morphology, and wood) of each process domain. The three process domains all differed in morphology and hydraulics, and those characteristics were important in shaping the transport capacity of mimics. On average, lakes retained more mimics than slow-flowing reaches but did not differ from the retainment of rapids. Living macrophytes were the most efficient element trapping mimics. In rapids and slow-flowing reaches, most trapped mimics remained floating, whereas in lakes, most mimics ended up on the banks. The decay curves of retention varied substantially among and within process domains. The results suggest that managers who rely on natural recovery of restored sites by means of plant immigration may benefit from understanding landscape patterns when deciding upon the location of restoration measures in stream networks.

Nyckelord

connectivity; hydrochory; lakes; northern Sweden; process domains; propagule mimics; streams

Publicerad i

Ecohydrology
2019, volym: 12, nummer: 5, artikelnummer: e2091
Utgivare: WILEY

SLU författare

• Nilsson, Christer

  • Institutionen för vilt, fisk och miljö, Sveriges lantbruksuniversitet
    
  • Umeå Universitet

Globala målen (SDG)

SDG6 Rent vatten och sanitet för alla

UKÄ forskningsämne

Oceanografi, hydrologi, vattenresurser

Publikationens identifierare

• DOI: https://doi.org/10.1002/eco.2091

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/101044