Sammanfattning

With the current loss of biodiversity and threats to freshwater ecosystems, it is crucial to identify hot-spots of biodiversity and on which spatial scale they can be resolved. Conservation and management of these important ecosystems needs insight into whether most of the regional biodiversity (i.e. gamma-diversity) can be found locally (i.e. high alpha-diversity) or whether it is distributed across the region (i.e. high beta-diversity). Biodiversity patterns of benthic macroinvertebrates and diatoms were studied in 30 headwater streams in five Swedish catchments by comparing the relative contribution of alpha- and beta-diversity to gamma-diversity between two levels of stream habitat hierarchy (catchment and region level). The relationship between species community structure and local environmental factors was also assessed. Our results show that both alpha- and beta-diversity made a significant contribution to gamma-diversity. beta-diversity remained relatively constant between the two levels of habitat hierarchy even though local environmental control of the biota decreased from the catchment to the region level. To capture most of headwater gamma-diversity, management should therefore target sites that are locally diverse, but at the same time select sites so that beta-diversity is maximized. As environmental control of the biota peaked at the catchment level, the conservation of headwater stream diversity is likely to be most effective when management targets environmental conditions across multiple local sites within relatively small catchments.

Nyckelord

alpha-diversity; beta-diversity; Headwater streams; Diatoms; Macroinvertebrates; Conservation management

Publicerad i

Biodiversity and Conservation
2014, Volym: 23, nummer: 1, sidor: 63-80
Utgivare: SPRINGER

SLU författare

• Kahlert, Maria

  • Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
    

• Temnerud, Johan

  • Institutionen för vatten och miljö, Sveriges lantbruksuniversitet
    
  • Sveriges meteorologiska och hydrologiska institut (SMHI)

Globala målen

SDG6 Säkerställa tillgången till och en hållbar förvaltning av vatten och sanitet för alla
SDG15 Skydda, återställa och främja ett hållbart nyttjande av landbaserade ekosystem, hållbart bruka skogar, bekämpa ökenspridning, hejda och vrida tillbaka markförstöringen samt hejda förlusten av biologisk mångfald


UKÄ forskningsämne

Miljövetenskap
Ekologi


Publikationens identifierare

DOI: https://doi.org/10.1007/s10531-013-0584-3

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/52346