Life history pattern of the endangered Valencia toothcarp, Valencia hispanica (Actinopterygii: Valenciidae) and its implications for conservation

Caiola, Nuño; Vargas, Maria Josep; Sostoa, Adolfo de

doi:10.1127/archiv-hydrobiol/150/2001/473

Cited by 26 publications

(28 citation statements)

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“…Females reach much larger size than males, possibly investing a larger proportion of the available resources to reproduction as they grow (Barbieri et al 2000). The female-biased sex ratio, not unusual in species with marked sexual dimorphism, may be attributed to differential predation, as also postulated for V. hispanica (Caiola et al 2001b) and A. iberus (Vargas and Sostoa 1997).…”

Section: Discussionmentioning

confidence: 91%

“…The data of the current study indicate that the reproductive period of the species can be quite prolonged, extending from April or May to late September, a period of high water temperatures, with multiple reproductive peaks. V. letourneuxi is a e Dytiscidae; f Baetidae out of the 13 taxa contributing 90% of the seasonal dissimilarity in the species' diet serial spawner (Barbieri et al 2000) and in that it resembles the cyprinodontid Aphanius iberus (Vargas and Sostoa 1997;Oliva-Paterna et al 2006), as well as its related species V. hispanica that has, however, a less prolonged reproductive period (Caiola et al 2001b). The maximum total length of the specimens from Chiliadou stream was 66.9 mm (SL 56 mm), similar to that reported (Stephanidis 1974).…”

Section: Discussionmentioning

confidence: 98%

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Feeding ecology of the critically endangered Valencia letourneuxi (Valenciidae)

et al. 2009

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Valencia letourneuxi is a critically endangered freshwater fish in urgent need of targeted conservation. Little information is however available on its life history and feeding ecology; therefore, food resource utilization by V. letourneuxi was studied in its most abundant known Greek population of Chiliadou stream. The diet of this population appears to be dominated by microcrustaceans, Dipteran larvae, Acari, and Mollusca. Its feeding is highly dependent on seasonal prey availability and diversity, with niche overlap being low only between winter and the rest of the seasons, indicating that only during winter its diet differs significantly in relation to the other seasons. There are no significant sex-and sizerelated dietary shifts. This V. letourneuxi population is characterized by a generalist feeding strategy and appears to consist mostly of individuals with broad niches. Its generalist feeding pattern and dietary flexibility permits it to fully exploit this very diverse and rich habitat and may account for the high local abundance of this population.

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Section: Discussionmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 98%

Feeding ecology of the critically endangered Valencia letourneuxi (Valenciidae)

et al. 2009

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“…The Estuarine Quality Paradox concept (Dauvin, 2007;Elliott and Quintino, 2007) refers to the challenge of detecting anthropogenic impacts in naturally stressed systems using biological assessment methods. In Mediterranean regions and particularly in the Iberian Peninsula, besides the spatial fluctuation there is strong temporal environmental variability in the aquatic systems due to limited water availability during part of the year (Caiola et al, 2001;Ferreira et al, 2007a). This variability is exacerbated by a long history of human-induced pressures that have led to serious changes in the natural ecological cycles of estuarine systems from this region (Ferreira et al, 2007b).…”

Section: Introductionmentioning

confidence: 99%

Community structure of benthic macroinvertebrates inhabiting a highly stratified Mediterranean estuary

Nebra¹,

Caiola²,

Ibáñez³

2011

Sci. Mar.

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SUMMARY:The community composition and spatial distribution of benthic macroinvertebrates were studied along the Ebro estuary, a highly stratified estuary located in the NE Iberian Peninsula. During the last decade the oligotrophication process occurring in the lower Ebro River and its estuary has allowed a complex benthic macroinvertebrate community to become established; these results contrast with the poor community found there in the early nineties. A total of 214 taxa were identified, and polychaetes dominated the community both in abundance and species richness. The results showed spatial differences in the structure and composition of macroinvertebrates, which suggests that there are two distinct communities along the estuary. Each community was found in a specific stretch (upper and lower estuary) in function of the presence of the salt wedge. The macrobenthos of the upper estuary was dominated by freshwater taxa, but some euryhaline species were also found. The lower estuary showed a marine community typical of shallow Mediterranean environments. The transition between these two communities fits an ecotone model. The highest abundances, richness and diversities were recorded at the lower estuarine stations, especially those closer to the river mouth, whereas the lowest values corresponded to the stations adjacent to the tip of the salt wedge.Keywords: benthic macroinvertebrates, community structure, distribution patterns, salt wedge, highly stratified estuary, Ebro estuary. RESUMEN: Estructura de la comunidad de macroinvertebrados bentónicos en un estuario mediterráneo altamente estratificado. -La composición de la comunidad y la distribución espacial de los macroinvertebrados bentónicos ha sido estudiada a lo largo del estuario del Río Ebro, un estuario altamente estratificado localizado al NE de la Península Ibérica. El proceso de oligotrofización ocurrido durante la última década en el tramo bajo del río Ebro y su estuario, ha permitido el establecimiento de una compleja comunidad de macroinvertebrados, contrastando con la comunidad encontrada a principios de los noventa. Un total de 214 taxones fueron identificados; los poliquetos constituyeron el grupo dominante en términos de riqueza y abundancia. Los resultados mostraron diferencias espaciales en la estructura y composición de macroinvertebrados, sugiriendo la existencia de dos comunidades diferentes a lo largo del estuario. Cada una de estas comunidades fue encontrada en un tramo específico (alto y bajo estuario) en función de la presencia de la cuña salina. El macrobentos del tramo alto del estuario estaba integrado mayoritariamente por taxones de agua dulce y algunos taxones eurihalinos. Por el contario, el tramo bajo presentó una comunidad marina típica de ambientes mediterráneos someros. La transición entre estas dos comunidades encajó con un modelo ecotonal. Las abundancias, riquezas y diversidades más elevadas fueron registradas en las estaciones del tramo bajo, especialmente en aquellas cercanas a la desembocadura; en cambio, los valores m...

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“…Exceptionally, it may live in some wetlands like coastal lagoons and swamps. The species is characterized by slow growth and high longevity (4+females; 3+males) when compared to other Cyprinodontiformes (Caiola et al 2001a). It has a narrow trophic spectrum (gammarids, midges and isopods) (Caiola et al 2001b;Caiola and De Sostoa 2002).…”

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confidence: 98%