By Lacey Avery
Little is known about the silver dik-dik (Madoqua piacentinii) population that roams the dense coastal bushlands of eastern Africa, but experts are working to learn more about the mysterious species.
Weighing little more than a domestic cat, the small antelopes are found in a long, narrow coastal strip spreading across 250 kilometers (155 miles) from Somalia's capital of Mogadishu north to the port town of Hobyo. This coastal strip is known as the Hobyo Grassland and Shrubland eco-region, according to the WWF.
The eco-region features white and orange sand dunes and endemic species of birds, mammals and reptiles, but political instability has left this area largely unexplored by scientists. Of the four recognized dik-dik species scientists understand silver dik-diks the least.
"We know very little about the actual silver dik-dik distribution in the Horn of Africa," Giovanni G. Bellani told mongabay.com. As a natural scientist, Bellani studies the zoology and biodiversity of tropical ecosystems, particularly in Africa. "We do not know its ecology, its behavior or its biology."
Initially thought to be the same species as the Salt's dik-dik (Madoqua saltiana), silver dik-diks were classified as a separate species in 1978 based on its consistently smaller size, uniform silvery coat color and the length of the upper tooth row.
Bellani and other scientists are analyzing the physical characteristics of silver dik-diks to further distinguish them from the look-alike Salt's dik-dik species. The team looked at the differences in coat color and size by examining original photos, skins from the Museum of Zoology and Natural History (La Specola) in Italy, and specimens from the Faraggiana-Ferrandi Museum of Natural History collection, also located in Italy. Bellani published a report of this analysis in the Gnusletter, the bi-annual journal of the IUCN/SSC Antelope Specialist Group (ASG).
All dik-diks have large dark eyes ringed by white hair, and a thick tuft of hair sticks up between the short horns of the males. The group found several distinctive features among silver dik-diks, including size. Silver dik-diks are consistently smaller than the other species, with smaller ears and a less distinct white circle around the eyes. In addition, silver dik-dik individual hairs are black at the tip, followed by a creamy-colored band, then dark brown tinged with red. These alternating bands of light and dark color never exceed 5 millimeters (0.2 inches), but the alternating bands of Salt's dik-diks often exceed this length, according to the report.
"I hope a detailed DNA analysis and comparison of the silver dik-diks and Salt's dik-dik will be done to better understand their genetic relationship," Bellani said. More....