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Alien species in the Guadiana Estuary (SE-Portugal/SW-Spain): Blackfordia virginica (Cnidaria, Hydrozoa) and Palaemon macrodactylus (Crustacea, Decapoda): potential impacts and mitigation measures

2009Journal article Open access
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dc.contributor.authorTeodosio, Maria
dc.contributor.authorLeitão, Tânia
dc.contributor.authorRange, Pedro
dc.contributor.authorGutierrez, Cristina
dc.contributor.authorMorales, Jesus
dc.contributor.authorMorais, P.
dc.contributor.authorChícharo, Luís
dc.date.accessioned2014-09-27T10:21:43Z
dc.date.available2014-09-27T10:21:43Z
dc.date.issued2009
dc.date.updated2014-09-26T10:18:49Z
dc.description.abstractThe cnidarian Blackfordia virginica and the adult of the caridean prawn, Palaemon macrodactylus are first recorded from the Guadiana Estuary. The habitats and environmental conditions under which these species were found are described and the potential impacts and mitigation measures for their introduction are discussed. The first observations of adults of these species were made in July 2008, at the transitional zone of the estuary (brackish area). Most samples taken in the middle-estuary were characterized by large densities of B. virginica (> 100 individuals 100 m-3), while P. macrodactylus was recorded in much smaller densities (<0.01 individuals m-2). Despite a comprehensive survey of invertebrates done between 1999 and 2003, neither of these species was previously detected in the Guadiana estuary. These observations may, therefore, coincide with the introduction of these species to the Guadiana estuary. Small planktonic crustaceans are generally described as the main food items for B. virginica. Our results show that the presence of the medusa was usually associated with a reduction of densities of all zooplanktonic organisms, including eggs of Engraulis encrasicolus. The reduction of planktonic biomass could have severe implications for organisms at upper trophic levels, such as E. encrasicolus, which use the Guadiana estuary as a nursery area and feed mostly on small planktonic crustaceans. Moreover, the potential consumption of eggs by B. virginica could potentially increase the impact on the nursery function of the estuary. The other alien species detected, P. macrodactylus, appears to be a strong invader, able to colonise a wide geographical range. It has a strong osmoregulatory capacity, and is known to inhabit a wide range of salinities, particularly if compared to similar native species (Crangon crangon and Palaemon longirostris). There is clear potential for the occurrence of competition for food between P. macrodactylus and the native prawn, due to dietary overlapping. The Guadiana estuary is under Mediterranean climate influence and is expected to be strongly impacted by climatic changes in the next decades. Other threat-factors are also present, such as increasing regulation by dams, the construction of new harbors, and increase shipping activity. It is important, therefore, to study the impact of these new invasions in this estuary and, based on the ecohydrology approach, propose mitigations measures to be applied in this system and other similar ecosystems worldwide.por
dc.identifier.citationChícharo, Maria Alexandra; Tânia Leitão; Range, Pedro; Cristina Gutierrez; Jesus Morales; Morais, Pedro; Chícharo, Luís. Alien species in the Guadiana Estuary (SE-Portugal/SW-Spain):Blackfordia virginica (Cnidaria, Hydrozoa) and Palaemon macrodactylus (Crustacea, Decapoda): potential impacts and mitigation measures, Aquatic Invasions, 4, 3, 501-506, 2009.por
dc.identifier.issn1818-5487
dc.identifier.otherAUT: LCH00360; MCH00377;
dc.identifier.urihttp://hdl.handle.net/10400.1/5142
dc.language.isoengpor
dc.peerreviewedyespor
dc.subjectAlien speciespor
dc.subjectLeptomedusaepor
dc.subjectCarideapor
dc.subjectGulf of Cadizpor
dc.subjectDamspor
dc.subjectEcohydrologypor
dc.titleAlien species in the Guadiana Estuary (SE-Portugal/SW-Spain): Blackfordia virginica (Cnidaria, Hydrozoa) and Palaemon macrodactylus (Crustacea, Decapoda): potential impacts and mitigation measurespor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage506por
oaire.citation.issue3por
oaire.citation.startPage501por
oaire.citation.titleAquatic Invasionspor
oaire.citation.volume4por
person.familyNameTeodosio
person.familyNameRange
person.familyNameMorais
person.familyNameChicharo
person.givenNameMaria
person.givenNamePedro
person.givenNamePedro
person.givenNameLuis
person.identifier424141
person.identifier.ciencia-idAF10-647B-65FB
person.identifier.ciencia-id1A19-7E90-8BDD
person.identifier.ciencia-id6716-EE1C-B995
person.identifier.orcid0000-0002-0939-9885
person.identifier.orcid0000-0002-9269-2416
person.identifier.orcid0000-0002-0861-5566
person.identifier.orcid0000-0002-4933-2300
person.identifier.ridB-5077-2013
person.identifier.ridC-5558-2008
person.identifier.ridF-2815-2011
person.identifier.scopus-author-id56196396700
person.identifier.scopus-author-id57200299298
person.identifier.scopus-author-id7005946306
person.identifier.scopus-author-id6602881426
rcaap.rightsopenAccesspor
rcaap.typearticlepor
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relation.isAuthorOfPublication.latestForDiscoveryb39b2d6d-d6f5-4130-a9b9-4e7624d44676

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