Literaturdatenbank
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Pearse, D. E., Eckerman, C. M., & Avise, J. C. (2001). A genetic analogue of 'mark-recapture' methods for estimating population size: an approach based on molecular parentage assessments. Molecular Ecology, 10(11), 2711–2718.
Added by: Admin (17 Aug 2008 18:17:24 UTC) |
| Resource type: Journal Article BibTeX citation key: Pearse2001b View all bibliographic details  |
Categories: General Keywords: Apalone, Apalone spinifera, Chrysemys, Chrysemys picta, Emydidae, Genetik = genetics, Habitat = habitat, Schildkröten = turtles + tortoises, Trionychidae, Trionyx Creators: , Avise, Eckerman, Pearse Collection: Molecular Ecology |
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Chrysemys picta Molecular polymorphisms have been used in a variety of ways to estimate both effective and local census population sizes in nature. A related approach for estimating the current size of a breeding population, explored here for the first time, is the use of genetic 'marks' reconstructed for otherwise unknown parents in paternity or maternity analyses of progeny arrays. This method provides interesting similarities and contrasts to traditional mark-recapture methods based on physical tags. To illustrate, this genetic method is applied to a population of painted turtles on the Mississippi River to estimate the number of successfully breeding males. Non-genetic mark-recapture approaches were also applied to animals trapped at this location. Results demonstrate that such genetic data on parentage can be helpful not only in estimating contemporary population sizes, but also in providing additional information, not present in customary mark-recapture data, about possible extended movements of breeding individuals and the size of the pool of mates which they encounter. Curtis Eckerman CV: Trionyx My current research focuses on the molecular evolution of Cytochrome b in turtles (specifically softshell turtles), the genetic variation in Apalone spinifera (The spiny softshell turtle), and how that variation was shaped by historical events (e.g. glaciation, sea level changes, etc..). I have chosed to work with A. spinifera because it has a lot of variation in the cytochrome b gene (Weisrock and Janzen, 2000) and is widely distributed throughout much of the central United States including Canada and Mexico. Spiny Softshell turtles are almost entirely aquatic coming out rarely to move to a different location or to lay eggs. This is primarily due to the fact that softshell turtles lack the bony scutes over their shell leaving them open to rapid dessication when out of the water. This property of being strictly aquatic has a big impact on my own study. One of the many hypotheses I am testing is that the genetic distance (how similar or dissimilar the DNA is) should be correlated with river distance and not geographic distance. Therefore, it is possible that two populations may be very close to each other (with regards to geographic distance) but because they are in different river systems may actually be separated by a 1000 miles of river making them very distant in terms of gene flow.
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