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<p>The globally invasive freshwater snail,&#xa0;<i>Physella acuta</i> (Draparnaud, 1805) is genetically diverse, with <i>cox1</i> haplotype markers identifying an invasive lineage (A) and a non-invasive lineage (B) restricted to its native North American habitat. This study investigated the differential fitness of A and B lineages within the species. Field-collected <i>P. acuta</i> were genetically characterized to establish laboratory strains representing mitotypes A and B. While the nuclear rDNA cassette (7,023&#xa0;nt) differed only by 0.03% between A and B, the mitogenome haplotypes differed in size (14,383 <i>vs.</i> 14,333&#xa0;bp) and sequence content (~ 9%). Fitness (growth rate, age and size at maturity, reproductive output) of A and B did not differ under laboratory conditions. A rewilding approach (exposure to native range field conditions) revealed greater fitness of <i>P. acuta</i> A relative to B snails, indicated by greater population-level fecundity, greater realized fecundity of A versus B, and higher survival rates of A in 3 of 7 experiments. While laboratory-based studies indicated only minor differences, the rewilding approach revealed significant differential fitness between A and B lineages of the species <i>P. acuta</i>, potentially influencing geographical distribution.</p>

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Rewilding shows differential fitness of sympatric Physella acuta (Draparnaud, 1805) snail lineages

  • 期刊论文

  • 发表日期：

    2025年1月16日

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  • Kevin A. McQuirk,
  • Juliana M. DeCore,
  • Maria G. Castillo,
  • Coen M. Adema

摘要

The globally invasive freshwater snail, Physella acuta (Draparnaud, 1805) is genetically diverse, with cox1 haplotype markers identifying an invasive lineage (A) and a non-invasive lineage (B) restricted to its native North American habitat. This study investigated the differential fitness of A and B lineages within the species. Field-collected P. acuta were genetically characterized to establish laboratory strains representing mitotypes A and B. While the nuclear rDNA cassette (7,023 nt) differed only by 0.03% between A and B, the mitogenome haplotypes differed in size (14,383 vs. 14,333 bp) and sequence content (~ 9%). Fitness (growth rate, age and size at maturity, reproductive output) of A and B did not differ under laboratory conditions. A rewilding approach (exposure to native range field conditions) revealed greater fitness of P. acuta A relative to B snails, indicated by greater population-level fecundity, greater realized fecundity of A versus B, and higher survival rates of A in 3 of 7 experiments. While laboratory-based studies indicated only minor differences, the rewilding approach revealed significant differential fitness between A and B lineages of the species P. acuta, potentially influencing geographical distribution.