Leaf Mimicry in a Climbing Plant Protects against Herbivory

Mimicry refers to adaptive similarity between a mimic organism and a model. Mimicry in animals is rather common, whereas documented cases in plants are rare, and the associated benefits are seldom elucidated [1, 2]. We show the occurrence of leaf mimicry in a climbing plant endemic to a temperate rainforest. The woody vine Boquila trifoliolata mimics the leaves of its supporting trees in terms of size, shape, color, orientation, petiole length, and/or tip spininess. Moreover, sequential leaf mimicry occurs when a single individual vine is associated with different tree species. Leaves of unsupported vines differed from leaves of climbing plants closely associated with tree foliage but did not differ from those of vines climbing onto leafless trunks. Consistent with an herbivory-avoidance hypothesis, leaf herbivory on unsupported vines was greater than that on vines climbing on trees but was greatest on vines climbing onto leafless trunks. Thus, B. trifoliolata gains protection against herbivory not merely by climbing and thus avoiding ground herbivores [3] but also by climbing onto trees whose leaves are mimicked. Unlike earlier cases of plant mimicry or crypsis, in which the plant roughly resembles a background or color pattern [4-7] or mimics a single host [8, 9], B. trifoliolata is able to mimic several hosts.

[1]  E. Gianoli,et al.  Leaf damage induces twining in a climbing plant. , 2005, The New phytologist.

[2]  D. Canyon,et al.  Mistletoe host-resemblance: A study of herbivory, nitrogen and moisture in two Australian mistletoes and their host trees , 1997 .

[3]  W. J. Bell.  Searching Behavior Patterns in Insects , 1990 .

[4]  E. Gianoli,et al.  Damage and shade enhance climbing and promote associational resistance in a climbing plant , 2007 .

[5]  D. L. Clark,et al.  Cryptic bracts facilitate herbivore avoidance in the mycoheterotrophic plant Monotropsis odorata (Ericaceae). , 2009, American journal of botany.

[6]  Michael Freeling,et al.  Horizontal Transfer of a Plant Transposon , 2005, PLoS biology.

[7]  E. Gianoli,et al.  Abundance of climbing plants in a southern temperate rain forest: host tree characteristics or light availability? , 2009 .

[8]  F. Valladares,et al.  Distribution and abundance of vines along the light gradient in a southern temperate rain forest , 2010 .

[9]  P. Downey.  An inventory of host species for each aerial mistletoe species ( Loranthaceae and Viscaceae ) in Australia , 2005 .

[10]  K. C. Burns,et al.  Hiding from the Ghost of Herbivory Past: Evidence for Crypsis in an Insular Tree Species , 2010, International Journal of Plant Sciences.

[11]  Ralph Bock,et al.  Horizontal transfer of chloroplast genomes between plant species , 2012, Proceedings of the National Academy of Sciences.

[12]  J. Stenberg,et al.  Visual cues override olfactory cues in the host‐finding process of the monophagous leaf beetle Altica engstroemi , 2007 .

[13]  G. Ruxton,et al.  Deception in plants: mimicry or perceptual exploitation? , 2009, Trends in ecology & evolution.

[14]  N. H. de Ibarra,et al.  How to look like a mallow: evidence of floral mimicry between Turneraceae and Malvaceae , 2007, Proceedings of the Royal Society B: Biological Sciences.

[15]  M. Suárez,et al.  Insect herbivory in climber–host shrubs associations: Benefit or detriment? , 2011 .

[16]  I. R. Cowan,et al.  Mistletoes: a hypothesis concerning morphological and chemical avoidance of herbivory , 1986, Oecologia.

[17]  R. Karban,et al.  Do plant–plant signals mediate herbivory consistently in multiple taxa and ecological contexts? , 2013 .

[18]  Richard Karban,et al.  Explaining evolution of plant communication by airborne signals. , 2010, Trends in ecology & evolution.

[19]  Influencia de las especies del dosel en la disponibilidad de recursos y regeneración avanzada en un bosque templado lluvioso del sur de Chile , 2003 .

[20]  J. Bohlmann,et al.  Monoterpene-induced molecular responses in Arabidopsis thaliana. , 2008, Phytochemistry.

[21]  P. Schlittenhardt,et al.  Genetic differentiation in the genus Lithops L. (Ruschioideae, Aizoaceae) reveals a high level of convergent evolution and reflects geographic distribution. , 2011, Plant biology.

[22]  A. Moles,et al.  Predicting network topology of mistletoe-host interactions: do mistletoes really mimic their hosts? , 2012 .

[23]  A. Gaskett.  Floral shape mimicry and variation in sexually deceptive orchids with a shared pollinator , 2012 .

[24]  E. Gianoli,et al.  Herbivory on Temperate Rainforest Seedlings in Sun and Shade: Resistance, Tolerance and Habitat Distribution , 2010, PloS one.

[25]  Ralph Bock,et al.  The give-and-take of DNA: horizontal gene transfer in plants. , 2010, Trends in plant science.

[26]  K. Burns.  Is crypsis a common defensive strategy in plants? Speculation on signal deception in the New Zealand flora , 2010, Plant signaling & behavior.

[27]  S. Dötterl,et al.  Leaf variegation in Caladium steudneriifolium (Araceae): a case of mimicry? , 2009, Evolutionary Ecology.

[28]  Meili Xiao,et al.  Horizontal gene transfer in plants , 2013, Functional & Integrative Genomics.

[29]  B. Barlow,et al.  HOST‐PARASITE RESEMBLANCE IN AUSTRALIAN MISTLETOES: THE CASE FOR CRYPTIC MIMICRY , 1977, Evolution; international journal of organic evolution.

[30]  W. Wellington,et al.  Environmental orientation by terrestrial Mollusca with particular reference to homing behaviour , 1981 .

[31]  E. Gianoli,et al.  Herbivores Modify Selection on Plant Functional Traits in a Temperate Rainforest Understory , 2012, The American Naturalist.

[32]  M. Joron,et al.  Diversity in mimicry: paradox or paradigm? , 1998, Trends in ecology & evolution.

[33]  R. Chazdon,et al.  A bounded null model explains juvenile tree community structure along light availability gradients in a temperate rain forest , 2006 .

[34]  C. Lusk.  Leaf area accumulation helps juvenile evergreen trees tolerate shade in a temperate rainforest , 2002, Oecologia.

[35]  M. Winter,et al.  Behavioural responses to visual stimuli by the snail Littorina irrorata , 1982, Animal Behaviour.

[36]  ALAN P. Smith,et al.  Ecology of a leaf color polymorphism in a tropical forest species: habitat segregation and herbivory , 1986, Oecologia.

[37]  C. Davis,et al.  Massive Mitochondrial Gene Transfer in a Parasitic Flowering Plant Clade , 2013, PLoS genetics.

[38]  C. Heusser,et al.  Flora del Parque Nacional Puyehue. , 1982 .