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2015 ; 7
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Plant cooperation
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Dudley SA
AoB Plants
2015[Sep]; 7
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The study of plant behaviour will be aided by conceptual approaches and
terminology for cooperation, altruism and helping. The plant literature has a
rich discussion of helping between species while the animal literature has an
extensive and somewhat contentious discussion of within-species helping. Here, I
identify and synthesize concepts, terminology and some practical methodology for
speaking about helping in plant populations and measuring the costs and benefits.
I use Lehmann and Keller's (2006) classification scheme for animal helping and
McIntire and Fajardo's (2014) synthesis of facilitation to provide starting
points for classifying the mechanisms of how and why organisms help each other.
Contextual theory is discussed as a mechanism for understanding and measuring the
fitness consequences of helping. I synthesize helping into four categories. The
act of helping can be costly to the helper. If the helper gains indirect fitness
by helping relatives but loses direct fitness, this is altruism, and it only
occurs within species. Helpers can exchange costly help, which is called
mutualism when between species, and reciprocation when within a species. The act
of helping can directly benefit the helper as well as the recipient, either as an
epiphenomenon resulting from behaviours under natural selection for other
reasons, or because the helper is creating a mutual benefit, such as satiating
predators or supporting a mutualism. Facilitation between species by stress
amelioration, creation of novel ecosystems and habitat complexity often meets the
definition of epiphenomenon helping. Within species, this kind of helping is
called by-product mutualism. If the helping is under selection to create a mutual
benefit shared by others, between species this is facilitation with service
sharing or access to resources and within species, direct benefits by mutual
benefits. These classifications provide a clear starting point for addressing the
subject of helping behaviours.