Changes made by humans to the natural landscapes can often compromise ecosystems, which paradoxically are vital for human survival. Pollination of crops by wild insects is one such vulnerable ecosystem service, as wild insects are declining in many agricultural landscapes. The study, recently published in Science, focused on understanding whether the ongoing loss of wild insects impacts crop harvest. For this purpose, the researchers compared fields with abundant and diverse wild insects to those with degraded assemblages of wild insects across 600 fields at 41 crop systems on all continents with farmland.
The study found that fruit set, the proportion of flowers setting seeds or fruits, was considerably lower in sites with less wild insects visiting the crop flowers. Therefore, losses of wild insects from agricultural landscapes will likely impact both our natural heritage and agricultural harvest.
As hives of the honey bee are frequently added for improved pollination, the researchers asked whether this application can compensate for limited abundance and diversity of wild insects and fully maximize crop harvest. They found that variation in honey bee abundance improved fruit set in only 14% of the crop systems they served. Furthermore, wild insects pollinated crops more effectively because an increase in their visitation enhanced fruit set by twice as much as an equivalent increase in honey bee visitation. Importantly, high abundance of managed honey bees supplemented, rather than substituted for, pollination by wild insects.
These results hold even for crops stocked routinely with high densities of honey bees for pollination, such as almond, blueberry, mango or watermelon. Although honey bees are generally viewed as a substitute for wild pollinators, this study demonstrates that they neither maximize pollination, nor fully replace the contributions of di
'/>"/>
| Contact: Lucas A. Garibaldi lgaribaldi@unrn.edu.ar 54-294-442-3731 Pensoft Publishers Source:Eurekalert |
Related biology news :
1. Wild pollinators support farm productivity and stabilize yield
2. Increase in Arctic shipping poses risk to marine mammals
3. Columbia Engineering and Penn researchers increase speed of single-molecule measurements
4. Fertilizer use responsible for increase in nitrous oxide in atmosphere
5. NIST/UMass study finds evidence nanoparticles may increase plant DNA damage
6. Study finds soda consumption increases overall stroke risk
7. Scientists have discovered genes that increase the risk of osteoporosis and fractures
8. Family history of liver cancer increases risk of developing the disease
9. Research shows how PCBs promote dendrite growth, may increase autism risk
10. Increased fructose consumption may deplete cellular energy in patients with obesity and diabetes
11. NIH-led study finds genetic test results do not trigger increased use of health services
 |
| Copyright © 2003-2012 Bio-Medicine. All rights reserved. ABOUT | CONTACT US | DISCLAIMER | PRIVACY POLICY | TERMS AND CONDITIONS |  |