Affiliations 

  • 1 Department of ZoologyUniversity of CambridgeDowning StreetCambridgeCB2 3EJUK
  • 2 School of ScienceMonash UniversityJalan Lagoon Selatan47500Subang JayaSelangor Darul EhsanMalaysia
  • 3 Natural Disaster Research CentreUniversiti Malaysia SabahJalan UMS88400Kota KinabaluSabahMalaysia
  • 4 Forest Research Centre (Sepilok)Sabah Forestry DepartmentP.O. Box 140790715SandakanSabahMalaysia
  • 5 Department of Life SciencesImperial College London, Silwood Park CampusBuckhurst RoadAscotSL5 7PYUK
  • 6 Faculty of Science and Natural ResourcesUniversiti Malaysia SabahJalan UMS88400Kota KinabaluSabahMalaysia
  • 7 School of BiologyNewcastle UniversityRidley Building 2Newcastle upon TyneNE1 7RUUK
  • 8 The South East Asia Rainforest Research Partnership (SEARRP)Danum Valley Field CentreP.O. Box 6028291112Lahad DatuSabahMalaysia
  • 9 Department of GeographySwansea UniversitySwanseaSA2 8PPUK
Ecohydrology, 2017 Jun;10(4):e1827.
PMID: 28706573 DOI: 10.1002/eco.1827

Abstract

Freshwaters provide valuable habitat and important ecosystem services but are threatened worldwide by habitat loss and degradation. In Southeast Asia, rainforest streams are particularly threatened by logging and conversion to oil palm, but we lack information on the impacts of this on freshwater environmental conditions, and the relative importance of catchment versus riparian-scale disturbance. We studied 16 streams in Sabah, Borneo, including old-growth forest, logged forest, and oil palm sites. We assessed forest quality in riparian zones and across the whole catchment and compared it with stream environmental conditions including water quality, structural complexity, and organic inputs. We found that streams with the highest riparian forest quality were nearly 4 °C cooler, over 20 cm deeper, had over 40% less sand, greater canopy cover, more stored leaf litter, and wider channels than oil palm streams with the lowest riparian forest quality. Other variables were significantly related to catchment-scale forest quality, with streams in the highest quality forest catchments having 40% more bedrock and 20 times more dead wood, along with higher phosphorus, and lower nitrate-N levels compared to streams with the lowest catchment-scale forest quality. Although riparian buffer strips went some way to protecting waterways, they did not maintain fully forest-like stream conditions. In addition, logged forest streams still showed signs of disturbance 10-15 years after selective logging. Our results suggest that maintenance and restoration of buffer strips can help to protect healthy freshwater ecosystems but logging practices and catchment-scale forest management also need to be considered.

* Title and MeSH Headings from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.