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The burrow of Dasypus hybridus [Cingulata: Dasypodidae]

100%

Gonzales E. M., Soutullo A., Altuna C. A.

Acta Theriologica

2001

tom 46

nr 1

Dasypus hybridus (Desmarest, 1804) inhabits open fields in southern South America. Burrows of D. hybridus were cylindrical with a conical end. They had an entrance and a single tunnel without branches. Three locations of the burrows in the terrain were detected: in banks of dried waterways, near rocks, and in open field. The orientation of 29 burrow mouths was not random and, although they did not point to any cardinal point, in particular there was a strong tendency to avoid the south quadrant. In a sample area of 90 x 140 m, burrow mouths were arranged in a random spatial pattern with a density of 25.4 burrows per ha. Great variation in burrow length was found (118.8 + 105.69 cm, CV = 89.0%). Tunnels may be used as refuges and/or for thermoregulation. The orientation of burrow mouths can also be related to thermoregulation as tunnels are covered from dominant winds, and, for many hours every day, the temperature at the mouths can be influenced by insolation. The possible existence of shelter-burrows and resting-burrows is discussed.

Ecological differences between two sympatric species of armadillos [Xenarthra, Mammalia] in a temperate region of Argentina

67%

Abba A. M., Cassini M. H.

Acta Theriologica

2010

tom 55

nr 1

35-44

Morpho-physiological specialization related to foraging can act as constraints on behaviour and ecological patterns of abundance and distribution. We tested this prediction in two species (weeping or screaming hairy armadillos Chaetophractus vellerosus Gray, 1865 and mulitas Dasypus hybridus Desmarest, 1804) that represent the two subfamilies of armadillos (Dasypodidae, Xenarthra): Euphractinae and Dasypodinae. The first subfamily possesses a well-developed masticatory apparatus that is considered primitive within the Xenarthra, while Dasypodinae show reductions in various aspects of cranial morphology. We sampled signs (burrows and foraging holes) and captured both species on 34 farms randomly selected in the north-eastern Pampas region of Argentina. We analyzed several niche dimensions. The two species showed significant differences in habitat use, seasonal patterns and diet. Weeping armadillos were generalists in their diet and active throughout the year. They were associated with calcareous-sand soil, as expected for a burrowing animal of the deserts. They tolerated a wide range of environmental conditions. We found that mulitas are myrmecophagous, and that they demonstrated a reduction in body temperature and activity during the cold season. As expected from their geographical distribution, mulitas used mainly vegetation with high cover and were associated with humic soils. Niche segregation between the two species of armadillos appeared to originate from different degrees of dietary specialization.

Ograniczanie wyników

2 Acta Theriologica

1 Abba A. M.

1 Altuna C. A.

1 Cassini M. H.

1 Gonzales E. M.

1 Soutullo A.

1 2010

1 2001

Wyniki wyszukiwania

The burrow of Dasypus hybridus [Cingulata: Dasypodidae]

Ecological differences between two sympatric species of armadillos [Xenarthra, Mammalia] in a temperate region of Argentina