Invasion
Invasion Description
1st Record: San Lucar de Barrameda/Spain/Guadualquivir River estuary (1997, Cuesta et al. 2004)
Geographic Extent
France/Gironde Estuary, Bay of Biscay (2006, Beguer et al. 2007; Beguer et al. 2011); Arcachon/France/Arcachon Bay (2009, Lavesque et al. 2010); France/Adour estuary, Bay of Biscay (2006, Beguer et al. 2007, 1 female); Bidassoa/France/Bay of Biscay (2009, Lavesque et al. 2010); Parque das Nações marinas/Portugal/Tagus estuary (Afonso et al. 2020); San Lucar de Barrameda/Spain/Guadualquivir River estuary (Cuesta et al. 2004); Porto Santa Maria/Spain/Guadalete River estuary (1999, Cuesta et al. 2004), Cadiz/Spain/San Pedro River estuary (1999, Cuesta et al. 2004); Spain-Portugal/Guadiana estuary (2004, Chicharo et al. 2009, Chainho et al. 2015, adults first seen in 2008); Portugal/Sado Estuary (2021, Riberio et al. 2023)
Vectors
| Level | Vector |
|---|---|
| Probable | Ballast Water |
Regional Impacts
| Ecological Impact | Competition | |
| In the Guadalquivir Estuary, Spain, competition between P. macrodactylus and the native Palaemon longirostris is considered possible, since diets strongly overlap (Gonzalez-Ortegon et al. 2010). Competition may be limited, however, since P. macrodactylus primarily utilizes the low-salinity regions of the estuary, where P. longirostris is rare (Gonzalez-Ortegon et al. 2010). One competitive advantage of P. macrodactylus over P. longirostris, and other species, is its greater ability to use areas of low oxygen concentration (Gonzalez-Ortegon et al. 2010; Gonzalez-Ortegon et al. 2013). In the Gironde estuary, France, P. macrodactylus initially colonized areas little-used by P. longirostris, but has begun to displace it due to higher reproductive rates (Beguer et al. 2011). | ||