| ultrastructural changes in the seminiferous epithelium of two seasonally reproducing bats (mammalia: chiroptera). | the sertoli cells of the cape horseshoe bat (rhinolophus capensis) and schreiber's long-fingered bat (miniopterus schreibersii) undergo marked changes in ultrastructure related to stages in the spermatogenic cycle. the amount of lipid stored in the sertoli cells varies annually and is at a maximum from just after spermiation to early in the following spermatogenic cycle. during spermatogenesis, the diameter of the lipid droplets decreases, reaching a minimum prior to spermiation. sertoli cells e ... | 1989 | 2709418 |
| thermal preference of schreiber's long-fingered (miniopterus schreiberisii) and cape horseshoe (rhinolophus capensis) bats. | thermal preference in a temperature gradient was investigated in schreibers' long-fingered (miniopterus schreibersii) and cape horseshoe (rhinolophus capensis) bats in relation to their roost temperatures. both species selected a wide range of temperatures but r. capensis selected a narrower range and most frequently selected temperatures were 2-3 degrees c lower than m. schreibersii. there was some evidence of seasonal changes in temperature preference in m. schreibersii but not in r. capensis. ... | 1994 | 7909730 |
| male reproduction in the cape horseshoe bat (rhinolophus capensis). | | 2013 | 3827391 |
| echolocation in the bat, rhinolophus capensis: the influence of clutter, conspecifics and prey on call design and intensity. | echolocating bats are exposed not only to the echoes of their own calls, but often the signals of conspecifics and other bats. for species emitting short, frequency modulated signals e.g. vespertilionoids, adjustments in both the frequency and time domain have been observed in such situations. however, bats using long duration, constant frequency calls may confront special challenges, since these bats should be less able to avoid temporal and frequency overlap. here we investigated echolocation ... | 2015 | 25987587 |
| development and characterization of 10 microsatellite markers in the cape horseshoe bat, rhinolophus capensis (chiroptera, rhinolophidae) and cross-amplification in southern african rhinolophus species. | the cape horseshoe bat, rhinolophus capensis, is endemic to the cape region of south africa. coalescent analysis of mitochondrial dna sequence data suggests extensive historical gene flow between populations despite strong geographic variation of their echolocation call phenotype. nevertheless the fine-scale genetic structure and evolutionary ecology of r. capensis remains poorly understood. here we describe the development of 10 novel polymorphic microsatellite loci to investigate of the disper ... | 2015 | 26409884 |
| sensory trait variation in an echolocating bat suggests roles for both selection and plasticity. | across heterogeneous environments selection and gene flow interact to influence the rate and extent of adaptive trait evolution. this complex relationship is further influenced by the rarely considered role of phenotypic plasticity in the evolution of adaptive population variation. plasticity can be adaptive if it promotes colonization and survival in novel environments and in doing so may increase the potential for future population differentiation via selection. gene flow between selectively d ... | 2014 | 24674227 |
| morphological correlates of echolocation frequency in the endemic cape horseshoe bat, rhinolophus capensis (chiroptera: rhinolophidae). | we investigated intraspecific variation in echolocation calls of the cape horseshoe bat, rhinolophus capensis, by comparing echolocation and associated morphological parameters among individuals from three populations of this species. the populations were situated in the center and at the western and eastern limits of the distribution of r. capensis. the latter two populations were situated in ecotones between vegetation biomes. ecotone populations deviated slightly from the allometric relations ... | 2011 | 21052683 |
| prolonged sperm storage in male cape horseshoe bats. an alternative solution to the reproductive limitations of winter hibernation. | | 1988 | 3398928 |
| seasonal changes in plasma testosterone concentrations and leydig cell and accessory gland activity in the cape horseshoe bat (rhinolophus capensis). | male cape horseshoe bats were studied in the cape province of south africa (33 degrees 17's, 26 degrees 25'e) between january 1983 and june 1985. the reproductive cycle is characterized by reactivation of the seminiferous tubules in early summer (october) after a 4-month (june to september) period of winter inactivity. spermiogenesis occurred between january and april, and spermatozoa were released to the epididymides in april and may. spermiogenesis was associated with leydig cell activity and ... | 1986 | 3806505 |
| the occurrence of spermiophagy under natural conditions in the cauda epididymidis of the cape horseshoe bat (rhinolophus capensis). | in cape horseshoe bats large numbers of spermatozoa remain in the cauda epididymidis after copulations have ceased in september. light microscopy has shown that for 5 months after september phagocytes are present in the lumen of the cauda epididymidis and electron microscopy has shown these cells to be active spermiophages. the large numbers of spermiophages present suggests that these cells could be responsible for removal of most of the excess spermatozoa. spermiophagy by the epididymal epithe ... | 1984 | 6747961 |
| the occurrence of abnormal sperm in the cauda epididymis of rhinolophus capensis (mammalia: chiroptera). | the spermatozoa of rhinolophus capensis are stored in the cauda epididymidis for about 10 months, 4 months prior to copulation and 6 months after copulation. electron microscopy has shown the occurrence of sperm defects (mitochondrial proliferation, bending and coiling of the tail, and dag defect) throughout the period of sperm storage. however, these defects are more common during the postcopulation period, when excess spermatozoa are being removed, suggesting that they may be associated with s ... | 1985 | 30011976 |