The role of physical barriers in promoting population divergence and genetic structuring is well known. While it is well established that animals can show genetic structuring at small spatial scales, less well-resolved is how the timing of the appearance of barriers affects population structure. This study uses the Panama Canal watershed as a test of the effects of old and recent riverine barri...

Little is known about the use of heterothermy by wild bats during summer, especially for tree-roosting species. Because thermal conditions within tree roosts can fluctuate widely with ambient temperature, which affects thermoregulatory energy expenditure during diurnal roosting, we measured skin temperatures of free-ranging male Nyctophilus geoffroyi (8 g) to quantify the relation between summe...

Seventeen specimens of carnivores the families Felidae (Puma concolor and Leopardus geoffroyi) Canidae (Lycalopex culpaeus) were collected in different localities Nahuel Huapi National Park (Argentina) from August 2005 to May 2018. The processed by necropsy, ascaridid parasites obtained only L. culpaeus. Morphological analysis indicates all belong Toxocara canis, specific identification was con...

The lateral geniculate body of both primates and subprimates has in recent years been the subject of many valuable studies which have led to a darification of the manner of termination of the retinal optic fibers and the cortical projection of the geniculo-clcarine fibers. These studies were based on experimental lesions of the retina, section of the optic tract and optic radiation, and cortica...

An influential hypothesis proposed by Greenwood (1980) suggests that different mating systems result in female and male-biased dispersal, respectively, in birds and mammals. However, other aspects of social structure and behavior can also shape sex-biased dispersal. Although sex-specific patterns of kin cooperation are expected to affect the benefits of philopatry and dispersal patterns, empiri...

Herpesvirus sylvilagus is a lymphotropic (type gamma) herpesvirus of cottontail rabbits (Sylvilagus floridanus). Analysis of virion DNA of herpesvirus sylvilagus has revealed that the genome consists of one stretch of about 120 kilobase pairs of internal, unique DNA flanked by a variable number of 553-base-pair tandem repeats. The G + C content of the repetitive DNA is extremely high (83%), as ...

Murine herpesvirus 68 (MHV-68) is a naturally occurring herpesvirus of small free-living rodents. In order to facilitate the molecular characterization of the virus genome, a library of cloned restriction fragments has been produced and restriction enzyme cleavage maps deduced for the enzymes BamHI, EcoRI and HindIII. The MHV-68 genome comprises a region of unique DNA of approximately 118 kbp w...