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Mutualisms involve cooperation, but also frequently involve conflict. Plant-pollinator mutualisms are no exception. To facilitate animal pollination, flowering plants often offer pollen (their male gametes) as a food reward. Since plants benefit by maximizing pollen export to conspecific flowers, we might expect plants to cheat on pollen rewards. In intersexual floral mimicry, rewarding pollen-bearing male flowers (models) are mimicked by rewardless female flowers (mimics) on the same plant. Pollinators should therefore learn to avoid the unrewarding mimics. Plants might impede such learning by producing phenotypically variable flowers that cause bees to generalize among models and mimics during learning. In this laboratory study, we used partially artificial flowers (artificial petals, live reproductive parts) modeled after Begonia odorata to test whether variation in the size of rewarding male flowers (models) and unrewarding female flowers (mimics) affected how quickly bees learned ....
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More signals. now they head underwater to locate possible wreckage. brian considering that no wreckage has been confirmed, it s a major achievement to have this kind of strong lead. it is, errol and we know this, because my team and i got access to the manufacturer of the pinger locater. that company is called phoenix international, it s head quartered here near washington, d.c., we got access to the facility a couple of weeks a ago, they showed us a model and showed us what it can do. it s extraordinary, this signal detection, if indeed it is the black box from mh-370, they told us without a confirmed piece of wreckage, it s difficult for the pinger to find something. what it s designed to do, once you found a piece of wreckage, ....