TY  - JOUR
A1  - Ayanu, Yohannes
A1  - Conrad, Christopher
A1  - Jentsch, Anke
A1  - Koellner, Thomas
T1  - Unveiling undercover cropland inside forests using landscape variables: a supplement to remote sensing image classification
JF  - PLoS ONE
N2  - The worldwide demand for food has been increasing due to the rapidly growing global population, and agricultural lands have increased in extent to produce more food crops. The pattern of cropland varies among different regions depending on the traditional knowledge of farmers and availability of uncultivated land. Satellite images can be used to map cropland in open areas but have limitations for detecting undergrowth inside forests. Classification results are often biased and need to be supplemented with field observations. Undercover cropland inside forests in the Bale Mountains of Ethiopia was assessed using field observed percentage cover of land use/land cover classes, and topographic and location parameters. The most influential factors were identified using Boosted Regression Trees and used to map undercover cropland area. Elevation, slope, easterly aspect, distance to settlements, and distance to national park were found to be the most influential factors determining undercover cropland area. When there is very high demand for growing food crops, constrained under restricted rights for clearing forest, cultivation could take place within forests as an undercover. Further research on the impact of undercover cropland on ecosystem services and challenges in sustainable management is thus essential.
KW  - climate change
KW  - land-cover classification
KW  - bale mountains national park
KW  - sub-saharan africa
KW  - agroforestry systems
KW  - biodiversity conservation
KW  - ecosystem services
KW  - topographic aspect
KW  - wheat-varieties
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-151686
VL  - 10
IS  - 6
ER  - 
TY  - JOUR
A1  - Kleijn, David
A1  - Winfree, Rachael
A1  - Bartomeus, Ignasi
A1  - Carvalheiro, Luísa G.
A1  - Henry, Mickael
A1  - Isaacs, Rufus
A1  - Klein, Alexandra-Maria
A1  - Kremen, Claire
A1  - M'Gonigle, Leithen K.
A1  - Rader, Romina
A1  - Ricketts, Taylor H.
A1  - Williams, Neal M.
A1  - Adamson, Nancy Lee
A1  - Ascher, John S.
A1  - Báldi, András
A1  - Batáry, Péter
A1  - Benjamin, Faye
A1  - Biesmeijer, Jacobus C.
A1  - Blitzer, Eleanor J.
A1  - Bommarco, Riccardo
A1  - Brand, Mariette R.
A1  - Bretagnolle, Vincent
A1  - Button, Lindsey
A1  - Cariveau, Daniel P.
A1  - Chifflet, Rémy
A1  - Colville, Jonathan F.
A1  - Danforth, Bryan N.
A1  - Elle, Elizabeth
A1  - Garratt, Michael P. D.
A1  - Herzog, Felix
A1  - Holzschuh, Andrea
A1  - Howlett, Brad G.
A1  - Jauker, Frank
A1  - Jha, Shalene
A1  - Knop, Eva
A1  - Krewenka, Kristin M.
A1  - Le Féon, Violette
A1  - Mandelik, Yael
A1  - May, Emily A.
A1  - Park, Mia G.
A1  - Pisanty, Gideon
A1  - Reemer, Menno
A1  - Riedinger, Verena
A1  - Rollin, Orianne
A1  - Rundlöf, Maj
A1  - Sardiñas, Hillary S.
A1  - Scheper, Jeroen
A1  - Sciligo, Amber R.
A1  - Smith, Henrik G.
A1  - Steffan-Dewenter, Ingolf
A1  - Thorp, Robbin
A1  - Tscharntke, Teja
A1  - Verhulst, Jort
A1  - Viana, Blandina F.
A1  - Vaissière, Bernard E.
A1  - Veldtman, Ruan
A1  - Ward, Kimiora L.
A1  - Westphal, Catrin
A1  - Potts, Simon G.
T1  - Delivery of crop pollination services is an insufficient argument for wild pollinator conservation
JF  - Nature Communications
N2  - There is compelling evidence that more diverse ecosystems deliver greater benefits to people, and these ecosystem services have become a key argument for biodiversity conservation. However, it is unclear how much biodiversity is needed to deliver ecosystem services in a cost- effective way. Here we show that, while the contribution of wild bees to crop production is significant, service delivery is restricted to a limited subset of all known bee species. Across crops, years and biogeographical regions, crop-visiting wild bee communities are dominated by a small number of common species, and threatened species are rarely observed on crops. Dominant crop pollinators persist under agricultural expansion and many are easily enhanced by simple conservation measures, suggesting that cost- effective management strategies to promote crop pollination should target a different set of species than management strategies to promote threatened bees. Conserving the biological diversity of bees therefore requires more than just ecosystem-service-based arguments.
KW  - ecosystem services
KW  - european countries
KW  - abundance
KW  - native bees
KW  - biodiversity conservation
KW  - plant diversity
KW  - fruit set
KW  - productivity
KW  - decline
KW  - pollen
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-151879
VL  - 6
IS  - 7414
ER  -