Solar radiation directly affects larval performance of a forest insect

Solar radiation can affect the performance of insect herbivores directly by increasing body temperature, or indirectly through alteration of either host plant quality or natural enemy activity. To test for the direct effect of solar radiation on larval performance, young Pinus sylvestris trees growing on the island of Gotland (Sweden) were assigned to one of four shading treatments for the whole duration of the first larval instar of the northern pine processionary moth Thaumetopoea pinivora. There was a strong, linear relationship between shading and the temperature of the first‐instar colonies of T. pinivora, resulting in higher growth of the larvae exposed to full sunlight, but there were no effects on developmental rate or larval mortality. Putative negative effects of UV radiation on the larvae are not consistent with higher growth in full sunlight, but it is possible that UV effects might have modulated the response. Thaumetopoea pinivora has a strong preference for light and open pine stands, i.e. habitats with frequent intense incoming solar radiation. The data in the present study suggest that the opportunity for young larvae to bask in the sun during cold spring weather is an important determinant of the spatial distribution of T. pinivora.

[1]  J. Wallén,et al.  Stepping‐stone expansion and habitat loss explain a peculiar genetic structure and distribution of a forest insect , 2013, Molecular ecology.

[2]  S. Larsson,et al.  Assessing the Impact of Climate Change on Outbreak Potential , 2012 .

[3]  Wenyun Zuo,et al.  A general model for effects of temperature on ectotherm ontogenetic growth and development , 2012, Proceedings of the Royal Society B: Biological Sciences.

[4]  C. Lei,et al.  Effects of UV‐A exposures on longevity and reproduction in Helicoverpa armigera, and on the development of its F1 generation , 2011 .

[5]  J. Wallén,et al.  Limited emigration from an outbreak of a forest pest insect , 2011, Molecular ecology.

[6]  S. Simpson,et al.  Locusts use dynamic thermoregulatory behaviour to optimize nutritional outcomes , 2011, Proceedings of the Royal Society B: Biological Sciences.

[7]  T. Remmel,et al.  Quantifying predation on folivorous insect larvae: the perspective of life‐history evolution , 2011 .

[8]  M. Ayres,et al.  Impact of climatic variation on populations of pine processionary moth Thaumetopoea pityocampa in a core area of its distribution , 2011 .

[9]  H. Van Dyck,et al.  Body temperature and territory selection by males of the speckled wood butterfly (Pararge aegeria): what makes a forest sunlit patch a rendezvous site? , 2011 .

[10]  S. Flint,et al.  Effects of solar ultraviolet radiation on terrestrial ecosystems. Patterns, mechanisms, and interactions with climate change , 2011, Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology.

[11]  A. Pitacco,et al.  Effects of colony size on larval performance in a processionary moth , 2010 .

[12]  M. Rantala,et al.  Effects of elevated ultraviolet-B radiation on a plant–herbivore interaction , 2010, Oecologia.

[13]  K. Gaston,et al.  Body size variation in insects: a macroecological perspective , 2010, Biological reviews of the Cambridge Philosophical Society.

[14]  C. Ballaré,et al.  Jasmonate-Dependent and -Independent Pathways Mediate Specific Effects of Solar Ultraviolet B Radiation on Leaf Phenolics and Antiherbivore Defense1[W][OA] , 2009, Plant Physiology.

[15]  C. Lei,et al.  Ultraviolet light-induced oxidative stress: effects on antioxidant response of Helicoverpa armigera adults. , 2009, Journal of insect physiology.

[16]  S. Larsson,et al.  Growth and survival of larvae of Thaumetopoea pinivora inside and outside a local outbreak area , 2008 .

[17]  T. Fartmann,et al.  The Duke of Burgundy butterfly and its dukedom: larval niche variation in Hamearis lucina across Central Europe , 2008, Journal of Insect Conservation.

[18]  R. A. Coleman,et al.  Tri-trophic consequences of UV-B exposure: plants, herbivores and parasitoids , 2007, Oecologia.

[19]  J. H. Wyk,et al.  Thermal melanism in ectotherms , 2007 .

[20]  S. Castellano,et al.  The Influence of Construction Parameters on Radiometric Performances of Agricultural Nets , 2006 .

[21]  J. Samietz,et al.  Modelling the phenology of codling moth: Influence of habitat and thermoregulation , 2006 .

[22]  R. Walters,et al.  The Temperature‐Size Rule in Ectotherms: May a General Explanation Exist after All? , 2006, The American Naturalist.

[23]  Andrea Battisti,et al.  EXPANSION OF GEOGRAPHIC RANGE IN THE PINE PROCESSIONARY MOTH CAUSED BY INCREASED WINTER TEMPERATURES , 2005 .

[24]  J. Samietz,et al.  Thermoregulation behaviour in codling moth larvae , 2005 .

[25]  M. Angilletta,et al.  Temperature, Growth Rate, and Body Size in Ectotherms: Fitting Pieces of a Life-History Puzzle1 , 2004, Integrative and comparative biology.

[26]  T. Rafoss,et al.  Can sunspot activity and ultraviolet–B radiation explain cyclic outbreaks of forest moth pest species? , 2004, Proceedings of the Royal Society of London. Series B: Biological Sciences.

[27]  H. Danks.  Seasonal Adaptations in Arctic Insects1 , 2004, Integrative and comparative biology.

[28]  C. Ballaré,et al.  Solar UV-B radiation affects leaf quality and insect herbivory in the southern beech tree Nothofagus antarctica , 2004, Oecologia.

[29]  T. Shreeve,et al.  The use of artificial neural networks in ecological analysis: estimating microhabitat temperature , 2002 .

[30]  C. Thomas,et al.  The influence of thermal ecology on the distribution of three nymphalid butterflies , 2002 .

[31]  Vincent J. Carey,et al.  Mixed-Effects Models in S and S-Plus , 2001 .

[32]  G. de Jong,et al.  Temperature dependence of development rate and adult size in Drosophila species: biophysical parameters , 2001 .

[33]  Bradford A. Hawkins,et al.  PREDATORS, PARASITOIDS, AND PATHOGENS AS MORTALITY AGENTS IN PHYTOPHAGOUS INSECT POPULATIONS , 1997 .

[34]  G. Jong,et al.  Adult Size in Ectotherms: Temperature Effects on Growth and Differentiation , 1996 .

[35]  N. Stamp,et al.  Simultaneous effects of night-time temperature and an allelochemical on performance of an insect herbivore , 1995, Oecologia.

[36]  T. D. Fitzgerald,et al.  ROLES OF THE TENT IN BEHAVIORAL THERMOREGULATION OF EASTERN TENT CATERPILLARS , 1988 .

[37]  D. Unwin,et al.  Field analyses of insect heat budgets: Reflectance, size and heating rates , 1981, Oecologia.

[38]  M. Angilletta.  Thermal Adaptation: A Theoretical and Empirical Synthesis , 2009 .

[39]  S. Solomon.  The Physical Science Basis : Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change , 2007 .

[40]  Yiyue Zhang,et al.  Technical summary , 2007 .

[41]  Kevin J. Gaston,et al.  The structure and dynamics of geographic ranges , 2003 .

[42]  A. Clarke,et al.  Ecology and behavior of first instar larval Lepidoptera. , 2002, Annual review of entomology.

[43]  S. Larsson.  Resistance in Trees to Insects — an Overview of Mechanisms and Interactions , 2002 .

[44]  Lee,et al.  Metabolic opportunists: feeding and temperature influence the rate and pattern of respiration in the high arctic woollybear caterpillar gynaephora groenlandica (Lymantriidae) , 1999, The Journal of experimental biology.

[45]  M. T.,et al.  Adult Size in Ectotherms: Temperature Effects on Growth and Differentiation , 1996 .