Wyniki wyszukiwania

1

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.

2

Ulnar dimensions and fossoriality in armadillos

84%

Vizcaino S. F., Farina R. A., Mazzetta G. V.

Acta Theriologica

|

1999

|

tom 44

|

nr 3

Ulnar dimensions were measured in 14 species of armadillos (Xenarthra: Dasy- podidae). An index of f'ossorial ability (IFA) was constructed, relating the length of the olecranon process to the remaining length of the ulna. For comparative purposes, the same measurements were taken in 14 other species of mostly South American mammals belonging to 3 orders and 11 families. The fossorial habits of these mammals were classified into 3 categories: (1) species mostly cursorial and non-digging; (2) species that often dig, but to which digging plays no essentia! part in their alimentary strategy and are not burrowers; and (3) species that are burrowers. IFA means of the studied mammal orders were compared using one-way analysis of variance on log-trans formed data. Bivariate size allametry between ulnar dimensions and body mass was assessed by fitting (least squares and geometric mean) linear regressions of log-transformed data. It is concluded that the IFA discriminates among the species according to their fossorial habits within orders, but it is not equally useful in distinguishing fossorial species between orders. In armadillos, the relationships between ulnar dimensions and body mass are isometrical, Finally, the IFA is independent of body size.

3

Systematic and distribution of Orihelia anticlava [Molin, 1858] [Nematoda, Onchocercidae] from dasypodids of South America

67%

Notarnicola J., Navone G. T.

Acta Parasitologica

|

2003

|

tom 48

|

nr 2

Among the Dasypodidae (Xenarthra), 5 species are currently known to be hosts of Orihelia anticlava (Molin, 1858) in Brazil, Paraguay and Argentina. We gather all the information regarding taxonomy, morphology, ecology and geographical distribution of O. anticlava, in order to hypothesize on the origin and evolution of this filarioid which is parasitic in an interesting host group, Dasypodidae. An amount of 192 specimens of 9 species of dasypodids from Argentina was prospected. Chaetophractus villosus and Tolypeutes matacus were parasitized. Measurements are provided, and the area rugosa described. Uterine microfilariae of O. anticlava show a considerable range of sizes; length of blood microfilariae seem not to be affected by geography; and, blood microfilariae are bigger than uterine ones. Despite that this parasite occurs in different host species, adult worms studied so far were morphologically alike. Prevalence and mean intensity were: C. villosus 10.8% and 8.5, T. matacus 3.7% and 1. Taking into account the geographic distribution of the hosts and the phylogeny of the dasypodids, we suggest that O. anticlava could be more widespread than currently noticed and other genera of dasypodids, such as Cabassous, Chlamyphorus, and Zaedyus, could also be parasitized. We believe that central Argentina, Uruguay, southern and northeastern Brazil should be considered preferable prospecting areas.

Ograniczanie wyników

2 Acta Theriologica

1 Acta Parasitologica

1 Altuna C. A.

1 Farina R. A.

1 Gonzales E. M.

1 Mazzetta G. V.

1 Navone G. T.

1 Notarnicola J.

1 Soutullo A.

1 Vizcaino S. F.

1 2003

1 2001

1 1999

The burrow of Dasypus hybridus [Cingulata: Dasypodidae]

Ulnar dimensions and fossoriality in armadillos

Systematic and distribution of Orihelia anticlava [Molin, 1858] [Nematoda, Onchocercidae] from dasypodids of South America