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      Nutrient acquisition across a dietary shift: fruit feeding butterflies crave amino acids, nectivores seek salt.

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          Abstract

          Evolutionary dietary shifts have major ecological consequences. One likely consequence is a change in nutrient limitation-some nutrients become more abundant in the diet, others become more scarce. Individuals' behavior should change accordingly to match this new limitation regime: they should seek out nutrients that are deficient in the new diet. We investigated the relationship between diet and responses to nutrients using adult Costa Rican butterflies with contrasting feeding habits, testing the hypothesis that animals will respond more positively to nutrients that are scarcer in their diets. Via literature searches and our own data, we showed that nitrogen and sodium are both at lower concentration in nectar than in fruit. We therefore assessed butterflies' acceptance of sodium and four nitrogenous compounds that ranged in complexity from inorganic nitrogen (ammonium chloride) to protein (albumin). We captured wild butterflies, offered them aqueous solutions of each substance, and recorded whether they accepted (drank) or rejected each substance. Support for our hypothesis was mixed. Across the sexes, frugivores were four times more likely to accept amino acids (hydrolyzed casein) than nectivores, in opposition to expectation. In males, nectivores accepted sodium almost three times more frequently than frugivores, supporting expectations. Together, these results suggest that in butterflies, becoming frugivorous is associated with an increased receptivity to amino acids and decreased receptivity to sodium. Nectivory and frugivory are widespread feeding strategies in organisms as diverse as insects, birds, and bats; our results suggest that these feeding strategies may put different pressures on how animals fulfill their nutritional requirements.

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          Author and article information

          Journal
          Oecologia
          Oecologia
          Springer Nature
          1432-1939
          0029-8549
          May 2016
          : 181
          : 1
          Affiliations
          [1 ] Department of Biology, Stanford University, Stanford, CA, 94305, USA. araven@stanford.edu.
          [2 ] Department of Biology, Stanford University, Stanford, CA, 94305, USA.
          [3 ] Department of Biological Sciences, University of South Carolina, Columbia, SC, 29208, USA.
          Article
          10.1007/s00442-015-3403-6
          10.1007/s00442-015-3403-6
          26267402
          c388133d-35df-4340-b2c8-42eb3fe8b1c6
          History

          Nectar,Nutrient limitation,Chemical composition,Feeding guild,Foraging

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