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<p>We studied long-term population dynamics of gall aphids and their host plants, manzanita shrubs (Ericaceae), at a field site along the Sierra–Cascade axis of northern California over a 20-year interval between wildfires. We sampled galls annually from a population of <i>Arctostaphylos viscida</i> (<i>n</i> = 133) and <i>Arctostaphylos manzanita</i> (<i>n</i> = 339) and dissected sample galls under a microscope to record the number of gall inducers (<i>Tamalia coweni</i> (Cockerell, 1905)) (Hemiptera: Aphididae) as well as inquilines (<i>Tamalia inquilinus</i> Miller, 2000) (Hemiptera: Aphididae) present in galls. We used a generalized linear mixed model to analyze insect counts per gall. Across the study period, the number of <i>T. coweni</i> apterous females per gall remained relatively constant. In contrast, apterous <i>T. inquilinus</i> females were more abundant (in galls containing both species) and exhibited pronounced temporal variability. These findings have potential implications for the rate and mode of evolutionary diversification in these two gall-dwelling aphid species.</p>

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Tamalia inquiline aphids (Aphididae) show higher frequencies of communal gall occupation than their host gall-inducing Tamalia aphids, with patterns influenced by host plant species

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Donald G. Miller III,
  • Robert J. Griffin-Nolan

摘要

We studied long-term population dynamics of gall aphids and their host plants, manzanita shrubs (Ericaceae), at a field site along the Sierra–Cascade axis of northern California over a 20-year interval between wildfires. We sampled galls annually from a population of Arctostaphylos viscida (n = 133) and Arctostaphylos manzanita (n = 339) and dissected sample galls under a microscope to record the number of gall inducers (Tamalia coweni (Cockerell, 1905)) (Hemiptera: Aphididae) as well as inquilines (Tamalia inquilinus Miller, 2000) (Hemiptera: Aphididae) present in galls. We used a generalized linear mixed model to analyze insect counts per gall. Across the study period, the number of T. coweni apterous females per gall remained relatively constant. In contrast, apterous T. inquilinus females were more abundant (in galls containing both species) and exhibited pronounced temporal variability. These findings have potential implications for the rate and mode of evolutionary diversification in these two gall-dwelling aphid species.