River barriers and cryptic biodiversity in an evolutionary museum
| Autor: | E. Mulotwa, Jessica E. Light, Gary Voelker, Charles Kahindo, Ben D. Marks, Jerry W. Huntley, U. A'genonga, L. E. Duffie, F. Bapeamoni, S. A. Rosenbaum |
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| Rok vydání: | 2013 |
| Předmět: |
0106 biological sciences
Pleistocene Range (biology) Lineage (evolution) Biodiversity Structural basin Louse 010603 evolutionary biology 01 natural sciences Gene flow 03 medical and health sciences biology.animal river barriers QH540-549.5 Ecology Evolution Behavior and Systematics Original Research 030304 developmental biology Nature and Landscape Conservation Congo River cryptic diversity 0303 health sciences Ecology biology Understory 15. Life on land lice birds Afrotropics |
| Zdroj: | Ecology and Evolution Ecology and Evolution, Vol 3, Iss 3, Pp 536-545 (2013) |
| ISSN: | 2045-7758 |
| Popis: | The Riverine Barriers Hypothesis (RBH) posits that tropical rivers can be effective barriers to gene flow, based on observations that range boundaries often coincide with river barriers. Over the last 160 years, the RBH has received attention from various perspectives, with a particular focus on vertebrates in the Amazon Basin. To our knowledge, no molecular assessment of the RBH has been conducted on birds in the Afrotropics, despite its rich avifauna and many Afrotropical bird species being widely distributed across numerous watersheds and basins. Here, we provide the first genetic evidence that an Afrotropical river has served as a barrier for birds and for their lice, based on four understory bird species collected from sites north and south of the Congo River. Our results indicate near‐contemporaneous, Pleistocene lineage diversification across the Congo River in these species. Our results further indicate differing levels of genetic variation in bird lice; the extent of this variation appears linked to the life‐history of both the host and the louse. Extensive cryptic diversity likely is being harbored in Afrotropical forests, in both understory birds and their lice. Therefore, these forests may not be “museums” of old lineages. Rather, substantial evolutionary diversification may have occurred in Afrotropical forests throughout the Pleistocene, supporting the Pleistocene Forest Refuge Hypothesis. Strong genetic variation in birds and their lice within a small part of the Congo Basin forest indicates that we may have grossly underestimated diversity in the Afrotropics, making these forests home of substantial biodiversity in need of conservation. |
| Databáze: | OpenAIRE |
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