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Artificial dam lakes as suitable habitats for exotic invertebrates: Ostracoda ecology and distribution in reservoirs of the Eastern Iberian Peninsula.
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- Author(s): Escrivà, A.; Rueda, J.; Armengol, X.; Mesquita-Joanes, F.
- Source:
Knowledge & Management of Aquatic Ecosystems; 2014, Issue 412, p1-12, 12p- Subject Terms:
- Source:
- Additional Information
- Alternate Title: Les lacs de barrage comme habitats appropriés pour les invertébrés exotiques : écologie et distribution des ostracodes dans les réservoirs dans l'Est de la péninsule ibérique. (French)
- Subject Terms:
- Abstract: Reservoirs are the most common deep lakes in Spain, as a consequence of water needs and dry climate. Although these aquatic systems can play an important ecological role in such an area with few large natural lakes, they can also provide new habitats for exotic species, which can colonize ecosystems that native species have not explored yet. Here we present our results for a biannual survey of the ostracod fauna from 24 reservoirs in Xúquer River basin. We check which variables affect ostracod presence, test for differences between winter and summer assemblages, and compare our data with previous available ostracod records from the same river drainage network. Our results reveal that ostracod presence is positively related to high diversity of the invertebrate community and reservoir volume, and negatively with phosphorus concentration. Among the 22 species found, it is noteworthy the first Iberian record of Ilyocypris getica and the second European record of Candonocypris novaezelandiae. Ostracod assemblages significantly vary between summer and winter, and strong differences are found between ostracod communities of reservoirs and those from their connected rivers. Remarkably higher frequency of exotic species in the reservoirs confirms previous findings about the facilitation that artificial ecosystems confer to aquatic invasions. [ABSTRACT FROM AUTHOR]
- Abstract: Les réservoirs sont les plus courants lacs profonds en Espagne, en réponse aux besoins en eau et au climat sec. Bien que ces systèmes aquatiques puissent jouer un rôle écologique important dans une région avec peu de grands lacs naturels, ils peuvent aussi fournir de nouveaux habitats pour les espèces exotiques, qui peuvent coloniser ces écosystèmes que les espèces indigènes n'ont pas encore explorés. Ici, nous présentons les résultats d'un suivi semestriel de la faune d'ostracodes de 24 réservoirs dans le bassin de la rivière Xúquer. Nous recherchons quelles variables affectent la présence des ostracodes, testons les différences entre les assemblages d'hiver et d'été, et comparons nos données avec des données antérieures d'ostracodes disponibles du même bassin versant. Nos résultats révèlent que la présence des ostracodes est positivement liée à la grande diversité de la communauté d'invertébrés et au volume du réservoir, et négativement avec la concentration en phosphore. Parmi les 22 espèces présentes, il est à noter le premier enregistrement ibérique de Ilyocypris getica et le deuxième d'Europe de Candonocypris novaezelandiae. Les assemblages d'ostracodes varient considérablement entre l'été et l'hiver, et de fortes différences sont observées entre les communautés d'ostracodes de réservoirs et celles de leurs rivières tributaires. Une fréquence remarquablement élevée d'espèces exotiques dans les réservoirs confirme des conclusions précédentes sur la facilitation que les écosystèmes artificiels confèrent aux invasions aquatiques. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Knowledge & Management of Aquatic Ecosystems is the property of EDP Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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