Riparian Research

oilpalm_riparian_3_MStruebig

Riparian reserves often contain the only forest vegetation for several kilometers in oil palm areas, and may play an important role in landscape connectivity for wildlife. Photo by Matt Struebig, DICE-University of Kent.

 

newton-logoMight-logo

Do riparian reserves maintain biodiversity and ecosystem functioning in oil palm dominated landscapes?

 

White-crowned_Hornbill_SMitchell

White-crowned hornbills use various parts of the SAFE landscape, but are often seen seeking refuge alongside rivers with ample trees alongside. A corridor’s health and viability can be judged by the diversity of wildlife using it. Photo by Simon Mitchell, DICE-University of Kent

Sunbears_riparian_20150725-121119_EBaking

Sunbears have been recorded across the logged over landscape at SAFE, and infrequently in new riparian reserves. Photo by Esther Baking, Universiti Malaysia Sabah and Nick Deere, DICE University of Kent

Oil palm is central to Malaysia’s economy and welfare of rural society, but has known environmental impacts on water quality, ecosystem functions and biodiversity if not managed sustainably. To help minimise hydrological problems Malaysia, like other tropical countries, requires companies to protect vegetation (20-30m) along rivers in oil palm plantations. Amidst growing interest in sustainability, the perceived benefits of this policy have also extended to provisions for endangered biodiversity and crucial ecosystem services such as reduced agricultural runoff and eutrophication. Riparian reserves could even be important to help mitigate against climate change by storing carbon in tree biomass and serving as critical wildlife corridors, aiding animal movements across human-managed landscapes to forest habitats that remain ‘climate-safe’.

Tarsier_in_riparian_KMullin

A rare glimpse of a tarsier, spotted during an evening bat survey within an oil palm riparian reserve several kilometers from intact forest. Photo by Kat Mullin, DICE-University of Kent

Surprisingly, unlike in temperate regions, there is very little scientific evidence supporting any of these benefits in the tropics. There is little information available about how the size of riparian buffer zones influences their ecological and biogeochemical functioning, and we have a poor understanding of how catchment size or the intensity of disturbance in the surrounding landscape matrix influences riparian zone function. It remains to be seen whether there is a threshold of disturbance size or intensity above which riparian zones cease to be effective. Additional data are needed to perform an integrated assessment of riparian buffers to evaluate their effectiveness for biodiversity conservation and maintenance of ecosystem functioning, and to determine if the Roundtable on Sustainable Palm Oil (RSPO) and national statutory requirements are sufficient to meet their environmental objectives.

SAFE_Orangutan_SMitchell

Orangutans have been observed feeding, and with young, in riparian zones at SAFE. Photo by Simon Mitchell, DICE-University of Kent

LOMBOK scientists are now addressing this issue thanks to additional funding from NERC, the British Council and the Malaysian Industry-Government Group for High Technology (MIGHT) via the Newton-Ungku Omar Fund. We have established a network of biodiversity monitoring and carbon (C) dynamics plots within riparian areas at SAFE, and preliminary work indicates that riparian strips are important for some biodiversity components. To determine the effectiveness of riparian policy we are investigating the influences of riparian habitat quality/width on water quality, aquatic and terrestrial biodiversity, and carbon stocks and emissions around oil palm plantation rivers and appropriate control sites. We are also extending our work on food web dynamics and exploring the potential for riparian habitats of varying sizes to serve as dispersal corridors linking forest patches.

Clouded_leopard_riparian_20150914-164434_EBaking

Clouded leopards are highly threatened, and sometimes captured on cameras at SAFE. There are several records from riparian zones. Photo by Esther Baking, Universiti Malaysia Sabah and Nick Deere, DICE University of Kent

 

Marbledcat_riparian_20150903-165321(34)_NDeere

Marbled cats have been photographed in riparian areas at SAFE. Photo by Esther Baking, Universiti Malaysia Sabah and Nick Deere, DICE University of Kent

 

oilpalm_riparian_1_MStruebig

A riparian reserve established in the oil palm landscape at the SAFE project in Sabah. Photo by Matt Struebig, DICE-University of Kent.

 

Logged_riparian_IMG_3251d_ZDavies

Scientists say that in Sabah, riparian vegetation should be retained alongside rivers more than 3 meters wide to provide cover and facilitate wildlife movement. Photo by Matt Struebig, DICE-University of Kent.

 

Map of LOMBOK riparian corridor sampling.

Map of LOMBOK riparian corridor sampling.

To find out more about some of the work we do on riparian ecology see the article on Mongabay.com.