2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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6/06/2017  |   11:15 AM - 11:30 AM   |  SEX AND SIZE SUBSIDIZED: THE EFFECTS OF PHOSPHORUS SUBSIDIES ON NYMPHAL MAYFLIES PHOSPHORUS CONTENT AND BODY SIZE   |  306C

SEX AND SIZE SUBSIDIZED: THE EFFECTS OF PHOSPHORUS SUBSIDIES ON NYMPHAL MAYFLIES PHOSPHORUS CONTENT AND BODY SIZE

Across a species’ ontogeny, small individuals grow faster than larger ones, and growth rate accelerates with dietary phosphorus (P) subsidies, potentially culminating in differences in P content and body size among populations. We sampled 7 central Texas streams representing a P enriched resource gradient and compared P content and body size between development classes and sexes of Baetis and Neochoroterpes mayfly nymphs. Percent P between sexes of Baetis did not differ within sites, whereas Neochoroterpes females were more P enriched than males in the largest size class, and female P enrichment increased across the P gradient. High P site Baetis were 4X as massive, and Neochoroterpes were 2X as massive as individuals from low P sites. At low P sites, Baetis mass did not differ among sexes within size classes, but Baetis females were at least 25% larger than males at high P sites. Neochoroterpes females were usually larger than males at low P sites, and at least 30% larger than males at high P sites. Body size increases have direct fitness consequences for mayflies because body size and fecundity are positively correlated.

  • C10 Biogeochemistry
  • C29 Life Histories
  • C15 Population Ecology & C30 Molecular Ecology

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Presenters/Authors

Jeffrey A. Back (), Baylor University, Jeff_Back@baylor.edu;


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Jason M. Taylor (), USDA, Agricultural Research Service, National Sedimentation Lab, jason.taylor@ars.usda.gov;


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Ryan S. King (), Baylor University, Ryan_S_King@ Baylor.edu;


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