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      A hypothesis to explain outbreaks of looper caterpillars, with special reference to populations of Selidosema suavis in a plantation of Pinus radiata in New Zealand.

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      Oecologia
      Springer Nature

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          Abstract

          A hypothesis originally postulated to explain changes in abundance of sapsucking insects is here extended to an interpretation of changes in abundance of populations of geometrid defoliators.The hypothesis states that most herbivorous insects usually remain at a low level of abundance relative to the apparent abundance of their food because most of them die when very young from a relative shortage of nitrogen in their food.Only occasionally do their food plants become a sufficient source of nitrogen to allow a high proportion of the young insects to survive, and the population to increase to outbreak levels.The plants become a richer source of nitrogen when they are stressed by random fluctuations in the summer and winter rainfall, although other factors such as soil type and topography may contribute to this stress.The hypothesis may well have wider application to population fluctuations of other herbivores-both invertebrate and vertebrate.

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          Author and article information

          Journal
          Oecologia
          Oecologia
          Springer Nature
          1432-1939
          0029-8549
          Dec 1974
          : 16
          : 4
          Affiliations
          [1 ] University of the South Pacific, Suva, Fiji.
          Article
          10.1007/BF00344738
          10.1007/BF00344738
          28308696
          31a6a400-1bd2-47de-a173-f05b7ef26a93
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