Estado de las poblaciones de trucha en los ríos de la Comunidad Valenciana y caracterización de sus hábitats

Hernández, A. Ballesteros; Diego, Juan

doi:10.4995/thesis/10251/14271

Cited by 2 publications

(2 citation statements)

References 88 publications

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“…Prey selection by trout can also play a role in the pattern of E. truttae infection. However, Sánchez Hernández (2009) concluded, after the study of stomach contents of brown trout captured from rivers in the Tambre and Ulla basins, that the feeding of the trout of this geographical area is determined by the most abundant and widely distributed prey through the river.…”

Section: Discussionmentioning

confidence: 99%

Remarkable differences in the presence of the acanthocephalan parasite Echinorhynchus truttae in brown trout (Salmo trutta) captured in two adjacent river basins in Galicia (NW Spain)

et al. 2018

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This is the first report on the presence of acanthocephalan parasite Echinorhynchus truttae in brown trout (Salmo trutta) from Spain. A total of 343 fish were captured by local anglers from 19 rivers in the adjacent Tambre and Ulla watersheds in Galicia (north-western Spain). Macroscopic and microscopic analyses of the intestinal contents revealed the presence of adults and/or eggs of E. truttae in 53 of the 123 trout from Tambre river basin (43.1%). By contrast, parasitic forms of this acanthocephalan were only observed in eight of the 220 fish from Ulla basin (3.6%), showing significant differences between the prevalences obtained in two adjacent watersheds (P < 0.001, odds ratio 19.0). Prevalence was significantly higher in specimens >3 years (length >26.0 cm) than in younger specimens (P < 0.05). The absence of Gammarus pulex in the region suggests that native gammarid species in Galicia (Echinogammarus lusitanicus and Echinogammarus beriyoni) may act as intermediate host in the life cycle of E. truttae. Different prevalences of E. truttae indicate that the presence/abundance of the intermediate crustacean host may be different in the two river basins, probably as a consequence of various abiotic factors and anthropogenic activities.

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Section: Discussionmentioning

confidence: 99%

Remarkable differences in the presence of the acanthocephalan parasite Echinorhynchus truttae in brown trout (Salmo trutta) captured in two adjacent river basins in Galicia (NW Spain)

et al. 2018

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“…Within the hydro-morphological assessment, the use of mesohabitat classifications might be highly relevant for making coherent assessments of the ecological status of Mediterranean rivers. In these environments, several studies have demonstrated the ecological relevance of mesohabitat classifications for aquatic species (e.g., Alcaraz-Hernández et al, 2007Alcaraz-Hernández, 2011;Costa et al, in press); however, a larger research effort is necessary.…”

Section: Discussionmentioning

confidence: 99%

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Palau

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Molina

et al. 2010

Multimed Tools Appl

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Mesohabitat heterogeneity in four mediterranean streams of the Jucar river basin (Eastern Spain)The hydromorphological units or mesohabitats of the headwaters of four Mediterranean streams were studied by classifying them according to their length, width, average and maximum depth, percentage of substrate and water volume. These characteristics of the streams were assessed over four consecutive years (2003)(2004)(2005)(2006). The main objective of the study was to analyse the spatial and temporal pattern of the physical attributes of the mesohabitats. Classification strength and dendrograms were examined for each stream, mesohabitat type, and combination of stream and mesohabitat type and for stream mesohabitat type and year, whereas Nonmetric Multidimensional Scaling ordination (NMDS) was used to analyse classification patterns. The Villahermosa and Ebrón streams were more homogeneous than the Palancia and Vallanca streams, whereas riffles and glides were more homogeneous than pools and rapids. The NMDS indicated that the slow water-velocity (pools, glides) and fast (riffles, rapids) mesohabitats tended to group together. Temporally, the Ebrón stream pools were homogeneous and very stable over the four years, whereas the Vallanca and Villahermosa pools showed a certain degree of variability. The Palancia pools were the most variable and heterogeneous during the study period. These results underscored the importance of separating different types of deep, slow-velocity habitats in mesohabitat inventories and the importance of evaluating habitat classifications in eco-hydromorphological and hydrobiological studies, especially in Mediterranean streams and rivers.Key words: Mediterranean streams, hydromorphological units, mesohabitat, habitat classification, similarity, Iberian Peninsula. (2003)(2004)(2005)(2006) RESUMEN Heterogeneidad del mesohábitat en cuatro ríos mediterráneos de la cuenca del río Jucar (Este de España) Las unidades hidromorfológicas o mesohábitats de cuatro ríos mediterráneos de cabecera fueron estudiadas en función de su longitud, anchura, profundidad media y máxima, porcentaje de sustrato y volumen de cada mesohábitat durante cuatro años consecutivos

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Estado de las poblaciones de trucha en los ríos de la Comunidad Valenciana y caracterización de sus hábitats

Cited by 2 publications

References 88 publications

Remarkable differences in the presence of the acanthocephalan parasite Echinorhynchus truttae in brown trout (Salmo trutta) captured in two adjacent river basins in Galicia (NW Spain)

Remarkable differences in the presence of the acanthocephalan parasite Echinorhynchus truttae in brown trout (Salmo trutta) captured in two adjacent river basins in Galicia (NW Spain)

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