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Renal Structural Adaptations among Three Species of Peccary

Stam M. Zervanos
The Southwestern Naturalist
Vol. 47, No. 4 (Dec., 2002), pp. 527-531
DOI: 10.2307/3672655
Stable URL: http://www.jstor.org/stable/3672655
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Renal Structural Adaptations among Three Species of Peccary
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Abstract

Several morphological characteristics of the kidney were studied to determine the degree of interspecific and intraspecific adaptation that might occur within 3 species of peccary from arid, semi-arid, and moist habitats. Paired kidney samples were collected from collared (Tayassu tajacu), Chacoan (Catagonus wagneri), and white-lipped (T. pecari) peccaries from habitats varying in water availability. Two indexes for renal concentrating ability, the relative medullary thickness and relative medullary area, exhibited higher values for animals from arid and semi-arid habitats than for those from moist habitats. Relative kidney mass also was higher for collared peccaries from dry environments. It was concluded that renal structures are flexible in response to environment variation, and the differences observed were related to the adaptability of renal concentrating structures. /// Se estudiaron algunas características morfológicas del riñón para determinar el grado de adaptación interespecífica e intraespecífica que pueden ocurrir en 3 especies de pecarí de hábitats áridos, semiáridos, y húmedos. Se reunieron muestras pares de riñón de los pecaríes de collar (Tayassu tajacu), del Chaco (Catagonus wagneri), y de quijada blanca (T. pecari) de hábitats que variaban en la disponibidad de agua. Dos índices que miden la habilidad renal para concentrar, el grosor relativo medular y el área medular relativa, mostraron cifras más altas en los animales de hábitats áridos y semiáridos que los de hábitats húmedos. También la masa renal relativa fue más alta para los pecaríes de collar en ambientes secos. Se concluyó que las estructuras renales son flexibles con respecto a las variaciones del medio ambiente, y que las diferencias observadas se relacionaron con la adaptabilidad de las estructuras renales que sirven para la concentración.

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