Morfometría del cangrejo de montaña (Hypolobocera aequatorialis) en el recinto Pintuguayco, Provincia de Chimborazo, Ecuador
Fecha
2022
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
Hypolobocera aequatorialises un cangrejode montaña nativo del Ecuador,cuyadistribución incluye las vertientes de la cordillera de los Andes,entre 400 y 1800 msnm. El objetivo de este trabajo fue determinar la morfometría deH.aequatorialisen el Recinto Pintohuayco, Provincia de Chimborazo, Ecuador. La recolección de individuos se realizó entre mayo y junio del 2022. A cada individuose le registró elalto, largo y ancho del carapacho (AlC, LC, AnC, respectivamente), de las quelas (AlQ, LQ, AnQ, respectivamente), el peso corporal;adicionalmente, en hembras, se registró el ancho del abdomen (AA). Los datos se transformaron en su logaritmo natural y se les ajustólos modelos: Lineal, Umbrales y Dos segmentos. Elmejor modelo fue seleccionado utilizando los pesos del Criterio de Información de Akaike corregido (WiAICc). Larelación talla-peso se analizó ajustando el modelo potenciala los datos crudos.Se recolectaron 201 individuos. Las hembras de H. aequatorialispresentaron tallas máximas superiores. Elmejor modelo para representar las relaciones entre el carapachoy las quelas fue el de Dos segmentos. El tipo de crecimiento fue isométrico (b= 1) y alométriconegativo (b< 1), parael primer y segundo segmento,respectivamente.La relación talla-peso mostróuna alometría negativa(b< 3). Las quelas presentaron uncrecimiento discontinuo en relación con elincremento corporal. La relación talla-peso mostro un patrón similar al encontrado en hembras de otras especies de cangrejos.Los resultados están sujetos al rango de tallas utilizado. Se sugiere incrementar el esfuerzo de muestreo para tener representación de individuos con tallas superiores.
Hypolobocera aequatorialisis a mountain crab native to Ecuador, whose distribution includes the slopes of the Andes Mountain range, between 400 and 1,800 meters above sea level. This work aimed to determine the morphometry of H. aequatorialisin the Pintohuayco Precinct, Chimborazo Province, Ecuador. The collection of individuals was carried out between May and June 2022. Each individual recorded the height, length, and width of the carapace (AlC, LC, AnC, respectively) of the chelae (AlQ, LQ, AnQ, respectively), body weight; additionally, in females, the width of the abdomen (AA) was recorded. The data was transformed into its natural logarithm and the models were adjusted: Linear, Thresholds, and Two segments. The best model was selected using weights Akaike’s Information Criterion (Wi AICc). The length-weight relationship was analyzed by fitting the potential model to the raw data. 201 individuals were collected. The females of H. aequatorialispresented larger maximum sizes. The Two-segment model was the best model to represent the relationships between the carapace and the chelae. The type of allometric growth was isometric (b= 1) and negative allometric (b< 1) for the first and second segments, respectively. The height-weight relationship showed negative allometry (b< 3). Thechelae presented a discontinuous growth about the body increase. The length-weight relationship showed a pattern like that found in females of other crab species. Results are subject to the size range used. It is suggested to increase the sampling effort to have representation of individuals of larger sizes.
Hypolobocera aequatorialisis a mountain crab native to Ecuador, whose distribution includes the slopes of the Andes Mountain range, between 400 and 1,800 meters above sea level. This work aimed to determine the morphometry of H. aequatorialisin the Pintohuayco Precinct, Chimborazo Province, Ecuador. The collection of individuals was carried out between May and June 2022. Each individual recorded the height, length, and width of the carapace (AlC, LC, AnC, respectively) of the chelae (AlQ, LQ, AnQ, respectively), body weight; additionally, in females, the width of the abdomen (AA) was recorded. The data was transformed into its natural logarithm and the models were adjusted: Linear, Thresholds, and Two segments. The best model was selected using weights Akaike’s Information Criterion (Wi AICc). The length-weight relationship was analyzed by fitting the potential model to the raw data. 201 individuals were collected. The females of H. aequatorialispresented larger maximum sizes. The Two-segment model was the best model to represent the relationships between the carapace and the chelae. The type of allometric growth was isometric (b= 1) and negative allometric (b< 1) for the first and second segments, respectively. The height-weight relationship showed negative allometry (b< 3). Thechelae presented a discontinuous growth about the body increase. The length-weight relationship showed a pattern like that found in females of other crab species. Results are subject to the size range used. It is suggested to increase the sampling effort to have representation of individuals of larger sizes.
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ALOMETRÍA, DOS SEGMENTOS, RELACIÓN TALLA-PESO, MODELO POTENCIAL, MADUREZ SEXUAL