High genetic diversity and absence of founder effects in a worldwide aquatic invader

Abstract

The introduced oriental shrimp Palaemon macrodactylus has recently become widespread in temperate estuaries worldwide. However, this recent worldwide spread outside of its native range arises after a previous introduction to the US Pacific coast, where it was restricted for more than 30 years. Using a phylogeographic approach, the present work investigates the genetic history of the invasion of this decapod worldwide. Japan acted as the main native source area for worldwide introduced populations, but other native areas (likely South Korea and China) may act as source populations as well. The recently introduced European and NW Atlantic populations result from colonization from both Japan and an unknown area of the native range, although colonization from the NE Pacific could not be ruled out. Most introduced populations had higher haplotypic diversity than most native populations. P. macrodactylus has a strong potential to become one of the most widespread introduced species and may become the dominant estuarine shrimp in Europe. The ecological and economic consequences of this invasion remain to be thoroughly evaluated.

Interdisciplinarity to reconstruct historical introductions: solving the status of cryptogenic crayfish

“…In fact, some of the private haplotypes described for Spanish crayfish populations are exclusive to areas where crayfish are known to have been introduced only after the 18th century. Private haplotypes found in an introduced population can be missing from their native area for different reasons, but particularly due to poor sampling in the native area (Simon et al ., ; Lejeusne et al ., ). Differences in sampling effort devoted to Spanish and Italian crayfish populations are evident in recent works.…”

“…High genetic diversity can be expected when several individuals are involved in the introduction or introductions are repeated several times (i.e. high propagule pressure) and/or when introduced individuals come from different areas within the native range (Kolbe et al ., ; Lejeusne et al ., ; Signorile et al ., ). Both high propagule pressure and diverse source populations are probable features of crayfish introduction in Spain.…”

Eastern spread of the invasive Artemia franciscana in the Mediterranean Basin, with the first record from the Balkan Peninsula

“…High haplotype diversity in alien crustacean populations is not unusual (Lejeusne et al, 2014). It is very likely that in the large and intensively harvested population Great Salt Lake, some genetic native diversity has not yet been captured by existing studies.…”

Refining and expanding global climate change scenarios in the sea: Poleward creep complexities, range termini, and setbacks and surges

“…Such studies could be mined to query if species expansions may have involved overlooked poleward movements, origin‐route‐destination networks that were not recognized as such, retrospectively identify the potential existence of range termini, or, indeed, discover previously unnoticed patterns of setbacks and surges. A few of many examples of regional or global studies that represent a broad range of taxa and that may benefit from retrospective analyses of “climate change biogeography” include the ctenophore (comb jelly) Mnemiopsis leidyi (Bayha et al., ) , the alga Codium fragile fragile (Provan, Booth, Todd, Beatty, & Maggs, ) , the alga Sargassum muticum (Engelen et al., ) , the skeleton shrimp Caprella mutica (Ashton, Willis, Cook, & Burrows, ), the shrimp Palaemon macrodactylus (Lejeusne et al., ), the green crab Carcinus maenas (Carlton & Cohen, ), the isopod Ianiropsis serricaudis (Hobbs et al., ) , the barnacle Amphibalanus improvisus (Wrange et al., ) , the mussel Musculista senhousia (Asif & Krug, ) , the bryozoan Watersipora spp. (Vieira, Jones, & Taylor, ) and the ascidians Styela plicata (de Barros, Rocha, & Pie, ), Ciona spp.…”