Publication: Edad y crecimiento de Gobio lozanoi Doadrio & Madeira,
2004 (Cypriniformes: Cyprinidae) en sectores fluviales de la
cuenca del río Segura (SE península ibérica)
Authors
Amat Trigo, Fátima ; Oliva Paterna, Francisco José ; Verdiell Cubedo, David ; Ruiz Navarro, Ana ; Torralva Forero, María del Mar
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Zoología y Antropología Física
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Publisher
Murcia: Servicio de Publicaciones de la Universidad de Murcia
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DOI
http://dx.doi.org/10.6018/analesbio.0.35.17
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info:eu-repo/semantics/article
Description
Abstract
El trabajo estudia la estructura de edad, longitud retrocalculada y
tasa de crecimiento en poblaciones de Gobio lozanoi a lo largo de
los principales ejes fluviales de la cuenca del río Segura (ríos Segura
y Mundo). Se analizaron estos parámetros con individuos
capturados en otoño de 2009 y en 19 localidades, así como su relación
con variables ambientales (altitud, estado ecológico y conductividad).
Las poblaciones reflejaron seis clases de edad (0+ a
5+) con escasas diferencias entre sexos y dominancia de edades
intermedias (2+ y 3+). La estructura de edades mostró variaciones
significativas en el gradiente con tendencia a presentar menor número
de clases en localidades a menor altitud. La tasa de crecimiento
se relacionó negativamente con la longevidad y mostró diferencias
entre sectores fluviales. La tasa de crecimiento en la fase
de transición a la madurez mostró tendencia a disminuir con el gradiente,
pero también conforme decrece el estado ecológico y aumenta
la conductividad.
ABSTRACT: The paper studies the age structure, back-calculated length and growth rate of Gobio lozanoi populations along the two main river axes of the Segura river basin (Segura and Mundo rivers). These parameters were analyzed from individuals captured in autumn 2009 and throughout 19 sampling locations, and their relationship with environmental variables (altitude, ecological status and conductivity). Populations showed six age classes (0+ to 5+) with few differences between sexes and dominance of intermediate ages (2+ and 3+). The age structure showed significant variations along the gradient with a tendency to narrower ranges of age in lower altitude locations. Growth rates showed a negative relationship with longevity and significant differences among fluvial sectors. The growth rate in the phase of transition to maturity showed a tendency to decrease with the gradient as well as the ecological state diminished and the water conductivity increased.
ABSTRACT: The paper studies the age structure, back-calculated length and growth rate of Gobio lozanoi populations along the two main river axes of the Segura river basin (Segura and Mundo rivers). These parameters were analyzed from individuals captured in autumn 2009 and throughout 19 sampling locations, and their relationship with environmental variables (altitude, ecological status and conductivity). Populations showed six age classes (0+ to 5+) with few differences between sexes and dominance of intermediate ages (2+ and 3+). The age structure showed significant variations along the gradient with a tendency to narrower ranges of age in lower altitude locations. Growth rates showed a negative relationship with longevity and significant differences among fluvial sectors. The growth rate in the phase of transition to maturity showed a tendency to decrease with the gradient as well as the ecological state diminished and the water conductivity increased.
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