|The invasive Giant Balsam (Impatiens glandulifera) - Photo: A. Vervoort|
11 December, 2012
by Valérie Cawoy et al.
Plant species that
invaded regions where they did not occur before can have deleterious effects on
the native flora. They are often ‘supergeneralists’ that attract large numbers
of insects with high amounts of nectar and pollen. This may lure pollinators away
from co-flowering native species in the surroundings. Consequently, these
native species receive less visits and less pollen is transferred, which could
lead to reduced fruit and seed production. On the other hand, so-called
facilitation effects have been also observed, where the invaders attract
pollinators to a patch of flowering plants and may thus increase flower visits
to native species.
Eingestellt von editor um 16:39
by Lise Hansted et al.
Low fruit set, despite normally-developed flowers in Spring, is often a significant contributor to poor yield in the self-fertile sour cherry (Prunus cerasus) cultivar ‘Stevnsbaer’ in Denmark. This study set out to investigate the effect of insect, and particularly, bee pollination on the fruit set of this cultivar, to provide information for beekeepers and cherry growers concerning the potential benefits of placing bees in the orchards.
|A flowering sour cherry branch caged with wire mesh and tulle net, allowing wind through whilst keeping insects out|
Eingestellt von editor um 16:20
04 November, 2012
by Leif L. Richardson And Judith L. Bronstein
|A female mason bee (Osmia species) foraging at manzanita flowers that have been previously nectar robbed. Photo by Dorit Eliyahu|
Mutualism is a biological phenomenon in which two species interact to their mutual benefit. A classic example is pollination, in which plants exchange a food reward (usually pollen or nectar) for pollen transport between flowers. Mutualisms are ubiquitous in nature, but so is their exploitation by organisms (often individuals of the mutualist species pair) that benefit from the exchange while not reciprocating with either partner. Despite their prevalence, theoretical models predict that these ‘cheaters’ should drive mutualisms to extinction because deriving a benefit without paying a cost should spread. How do mutualisms persist in the face of this pervasive exploitation?
Eingestellt von editor um 21:17
31 October, 2012
By James D. Thomson, Jane E. Ogilvie, Takashi T. Makino, Angela Arisz, Sneha Raju, Vanessa Rojas-Luengas, Marcus Tan
|An artificial flower|
Eingestellt von editor um 15:49