Population surveys of the ice rat Otomys sloggetti robertsi in the Lesotho Drakensberg

  • Thabiso Mokotjomela
  • Ute Schwaibold
  • Neville Pillay

Abstract

Increasing environmental temperatures may lead to better survival of organisms that are usually susceptible to low temperatures. We investigated whether the numbers of the ice rat Otomys sloggetti robertsi, whose populations are regulated by low temperatures, have  increased in the recent past as a consequence of current environmental warming in the Lesotho Drakensberg. Ice rats are endemic to the southern African alpine zone, are exclusively herbivorous, have a diurnal activity profile, and live in underground burrows. We predicted that ice rat numbers would remain stable or increase since winters have become milder. We monitored ice rat numbers in three locations, separated by 70, 80 and130 km. The results show that the population density of ice rats has increased over threefold to 352 ice rats per hectare over the past decade. Our findings suggest that higher temperatures could have improved habitat productivity and reduced thermal stress, and thus improved winter survival of ice rats.

African Zoology 45(2): 225–232 (October 2010)

Author Biographies

Thabiso Mokotjomela

School of Animal Plant and Environmental Sciences, University of Witwatersrand, Private Bag 3, WITS 2050, Johannesburg, South Africa

Ute Schwaibold
School of Animal Plant and Environmental Sciences, University of Witwatersrand, Private Bag 3, WITS 2050, Johannesburg, South Africa
Neville Pillay
School of Animal Plant and Environmental Sciences, University of Witwatersrand, Private Bag 3, WITS 2050, Johannesburg, South Africa
Published
2017-05-03
Section
Articles

Journal Identifiers


eISSN: 2224-073X
print ISSN: 1562-7020