Evolution of bats
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Recent papers in Evolution of bats
Myotis muricola is a widespread species covering the Malay Archipelago through the West and East of Wallace’s Line. The genetic analysis, based on partial cytochrome b gene, shows the high genetic variation within M. muricola. The... more
Myotis muricola is a widespread species covering the Malay Archipelago through the West and East of Wallace’s Line. The genetic analysis, based on partial cytochrome b gene, shows the high genetic variation within M. muricola. The phylogenetic analysis has indicated that M. muricola in the Malay Archipelago are monophyletic. Members of M. muricola Eastern are grouped together independently of M. muricola Western and both groups are distantly related. On the other hand, M. muricola Western and M. muricola Eastern are distinct species and sister taxa to M. mystacinus. Based on the high genetic distance (26.8% to 38.5%) and the Genetic Species Concept (Baker & Bradley, 2006), it can be concluded that M. muricola Western and M. muricola Eastern should be considered as two distinct species. Furthermore, two subgroups within M. muricola Western, namely Sumatra-Asian and Bornean subgroups, are recognised as distinct subspecies (with genetic distance of 5.1% to 10.8%). The evidence from the molecular data indicated M. muricola Eastern as the ancestor of M. muricola species complex in the Malay Archipelago, which had earlier diverged into the western region during the Pliocene. Meanwhile, the geographical conditions during the Pleistocene had given more chances for fauna to diversify. It was predicted that M. muricola diverged in the western part of the Malay Archipelago during the Pleistocene when the sea level dropped and produced some landbridges among the islands in Sundaland. The hypothetical dispersal routes of M. muricola are related to the ancient Sunda River systems that produced gallery forest corridors for migration and which served as Pleistocene
refuges during the migration.
Phylogeny and Phylogeography of insect bat Myotis muricola (Gray, 1846) (Chiroptera: Vespertilionidae) from the West and and East of Wallace's Line Inferred from Partial MtDNA Cytochrome b Gene. Sigit Wiantoro, Ibnu Maryanto and M.T. Abdullah. 2012. Pertanika Journal of Tropical Agricultural Science 35(2): 271-292.
Scopus Index. Voted best paper 3 September 2012.
refuges during the migration.
Phylogeny and Phylogeography of insect bat Myotis muricola (Gray, 1846) (Chiroptera: Vespertilionidae) from the West and and East of Wallace's Line Inferred from Partial MtDNA Cytochrome b Gene. Sigit Wiantoro, Ibnu Maryanto and M.T. Abdullah. 2012. Pertanika Journal of Tropical Agricultural Science 35(2): 271-292.
Scopus Index. Voted best paper 3 September 2012.
Social media has deeply transformed the way people communicate ideas and information, shifting from traditional media forms (e.g. newspapers, television and magazines) to digital media; of which, Facebook and Twitter stand out in terms of... more
Social media has deeply transformed the way people communicate ideas and information, shifting from traditional media forms (e.g. newspapers, television and magazines) to digital media; of which, Facebook and Twitter stand out in terms of disseminating academic information and conservation outreach. Broad scientific communication and outreach have been highlighted as one of the most efficient methods to tailor people's behaviour towards environmentally-friendly practices. However, some concerns about the use of social media have been raised, particularly: the potential misinterpretation of inherently brief messages; the fast analysis of complex problems, situations or concepts; the fact that they can trigger misinformation cascades due to the time-sensitive and political nature of some conservation issues; an overestimation of potential outreach due to the homophilic effect; or the likelihood to suffer from information fatigue syndrome (IFS). We evaluated the presence of the scientific journal Barbastella-published by the Spanish Society for Bat Research and Conservation (SECEMU)-on Facebook and Twitter during a period of almost two years and its Twitter outreach performance during the Spanish Bat Research and Conservation Conference (SBRCC) in 2014. Since the launch of its Facebook and Twitter accounts, Barbastella has respectively gathered 1,935 and 931 followers. Several posts have potentially reached between 5,000-17,000 (Facebook) and 3,000-5,500 (Twitter) users and whereas the Facebook account presented an audience mostly composed by local researchers and bat enthusiasts from Spain and Portugal, the Twitter account had a much more international audience. During the SBRCC, there were more online (Twitter and Facebook) followers of the conference than in situ conference attendants, even though conference tweets were almost exclusively posted by the Journal committee. Our analyses reveal the large potential of Facebook and Twitter to disseminate information far beyond more classical tools and highlights that social media can potentially play an important role in conservation science, while serious consideration on its usage must be taken into account to reduce possible social media inherent weaknesses. Both social media platforms were found to be complementary suggesting that cross-posting on multiple networks can considerably improve visibility. In order to disseminate research without compromising time commitment towards other scientific tasks, it is essential to have a targeted strategy for using social media with an accurate and reasonable planning of online time commitment, addressing all public target time-zones, selecting the most appropriate platform, publishing understandable brief and visual posts with reliable information amongst other optimizing strategies.
The evolutionary sequence of events that led to flight and echolocation in bats is a compelling question in biology. Fundamentally lacking from this discussion is the ontogeny of how these two systems become functionally integrated... more
The evolutionary sequence of events that led to flight
and echolocation in bats is a compelling question in biology.
Fundamentally lacking from this discussion is the ontogeny of
how these two systems become functionally integrated producing an evolutionary developmental model. We build such a model by integrating growth and development of the cochlea, larynx, and sound production with the ontogeny of locomotion in newborn bats. In addition, we use available fossil and molecular data along with patterns of high frequency vocalization in extant mammals to model probable evolutionary transitions in bats.We find clear evidence that the ability to hear high frequency echolocation-like sounds preceded the ability to produce it and that a simple echolocation system was likely inherited from a shrew-like ancestor and was not an in situ evolutionary innovation of bats. Refinement of this system coevolved with sustained flight, both ontogenetically and evolutionarily, leading to the sophisticated echolocation observed today.
and echolocation in bats is a compelling question in biology.
Fundamentally lacking from this discussion is the ontogeny of
how these two systems become functionally integrated producing an evolutionary developmental model. We build such a model by integrating growth and development of the cochlea, larynx, and sound production with the ontogeny of locomotion in newborn bats. In addition, we use available fossil and molecular data along with patterns of high frequency vocalization in extant mammals to model probable evolutionary transitions in bats.We find clear evidence that the ability to hear high frequency echolocation-like sounds preceded the ability to produce it and that a simple echolocation system was likely inherited from a shrew-like ancestor and was not an in situ evolutionary innovation of bats. Refinement of this system coevolved with sustained flight, both ontogenetically and evolutionarily, leading to the sophisticated echolocation observed today.
The production of echolocation calls in bats along with forces produced by contraction of thoracic musculature used in flight presumably puts relatively high mechanical loads on the lower respiratory tract (LRT). Thus, there are likely... more
The production of echolocation calls in bats along with forces produced by contraction of thoracic musculature used in flight presumably puts relatively high mechanical loads on the lower respiratory tract (LRT). Thus, there are likely adaptations to prevent collapse or distortion of the bronchial tree and trachea during flight in echolocating bats. By clearing and staining (Alcian blue and Alizarin red) LRTs removed from nonvolant neonates, semivolant juveniles, volant subadults, and adult Jamaican fruit bats (Artibeus jamaicensis), I found that calcification of the tracheal, primary bronchial, and secondary bronchial (lobar) cartilage rings occurs over the span of about 3 days and coincides with later developmental stages of flight and the increased production of echolocation calls. Tracheal rings that are immediately adjacent to the larynx calcified first, followed by more caudal tracheal rings and then the rings of the primary and secondary bronchi. I suggest that calcification of LRT cartilage rings in echolocating bats provides increased rigidity to counter the thoracic compressions incurred during flight. Calcification of the LRT rings is an adaptation to support the emission of laryngeally produced echolocation calls during flight in bats.
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