The effects of fragmentation on the genetic structure of Theobroma speciosum (Malvaceae) populations in Mato Grosso, Brazil
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| Format: | Artículo científico |
| Language: | en |
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Universidad de Costa Rica
2018
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| _version_ | 1876441542461227008 |
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| author | Juliana de Freitas Encinas Dardengo |
| author_facet | Juliana de Freitas Encinas Dardengo |
| contents | The effects of fragmentation on the genetic structure of Theobroma speciosum (Malvaceae) populations in Mato Grosso, Brazil Juliana de Freitas Encinas Dardengo Ana Aparecida Bandini Rossi Tatiane Lemes Varella Biología Amazon cacauhy inbreeding microsatellite Genetic variability Native Theobroma species, such as cacauhy, are losing their habitat due to the intense forest fragmentation in the Amazon region, and preserving their genetic diversity has been the focus of many conservation programs. The aim of the present study is to assess whether fragmentation and habitat reduction affect its genetic structure and lead to genetic diversity losses in natural Theobroma speciosum populations. The study was conducted in two Mato Grosso State (Brazil) locations: Apiacás and Alta Floresta counties. Juruena National Park (JNP) in Apiacás County holds a natural T. speciosum population that has not suffered anthropic influences. A population composed of individuals from three anthropized urban forest parks (UF) in Alta Floresta County was analyzed for comparison. The leaves of 75 T. speciosum individuals distributed in the urban forest fragments and of 100 individuals found in the Juruena National Park were sampled. All nine microsatellite loci showed high polymorphism levels between categories (adults and sub-adults), in both populations. The sub-adult individuals of the fragmented area had a higher value (0.71), and the preserved population, the same value (0.69). The analysis of molecular variance showed 83 % genetic diversity within categories; 16 %, between populations; and only 1 %, between categories. Although the effects were small, a persistent fragmentation process can increase inbreeding and facilitate genetic drift, leading T. speciosum populations to inbreeding depression and loss of diversity. Rev. Biol. Trop. 66(1): 218-226. Epub 2018 March 01. 2018 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44955366017 https://www.redalyc.org/journal/449/44955366017/ https://www.redalyc.org/journal/449/44955366017/html/ https://www.redalyc.org/journal/449/44955366017/44955366017.epub https://www.redalyc.org/journal/449/44955366017/movil 10.15517/rbt.v66i1.27904 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.66 |
| format | Artículo científico |
| id | redalyc_44955366017 |
| institution | Redalyc |
| language | en |
| publishDate | 2018 |
| publisher | Universidad de Costa Rica |
| spellingShingle | The effects of fragmentation on the genetic structure of Theobroma speciosum (Malvaceae) populations in Mato Grosso, Brazil Juliana de Freitas Encinas Dardengo Biología Amazon cacauhy inbreeding microsatellite Genetic variability The effects of fragmentation on the genetic structure of Theobroma speciosum (Malvaceae) populations in Mato Grosso, Brazil Juliana de Freitas Encinas Dardengo Ana Aparecida Bandini Rossi Tatiane Lemes Varella Biología Amazon cacauhy inbreeding microsatellite Genetic variability Native Theobroma species, such as cacauhy, are losing their habitat due to the intense forest fragmentation in the Amazon region, and preserving their genetic diversity has been the focus of many conservation programs. The aim of the present study is to assess whether fragmentation and habitat reduction affect its genetic structure and lead to genetic diversity losses in natural Theobroma speciosum populations. The study was conducted in two Mato Grosso State (Brazil) locations: Apiacás and Alta Floresta counties. Juruena National Park (JNP) in Apiacás County holds a natural T. speciosum population that has not suffered anthropic influences. A population composed of individuals from three anthropized urban forest parks (UF) in Alta Floresta County was analyzed for comparison. The leaves of 75 T. speciosum individuals distributed in the urban forest fragments and of 100 individuals found in the Juruena National Park were sampled. All nine microsatellite loci showed high polymorphism levels between categories (adults and sub-adults), in both populations. The sub-adult individuals of the fragmented area had a higher value (0.71), and the preserved population, the same value (0.69). The analysis of molecular variance showed 83 % genetic diversity within categories; 16 %, between populations; and only 1 %, between categories. Although the effects were small, a persistent fragmentation process can increase inbreeding and facilitate genetic drift, leading T. speciosum populations to inbreeding depression and loss of diversity. Rev. Biol. Trop. 66(1): 218-226. Epub 2018 March 01. 2018 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44955366017 https://www.redalyc.org/journal/449/44955366017/ https://www.redalyc.org/journal/449/44955366017/html/ https://www.redalyc.org/journal/449/44955366017/44955366017.epub https://www.redalyc.org/journal/449/44955366017/movil 10.15517/rbt.v66i1.27904 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.66 |
| title | The effects of fragmentation on the genetic structure of Theobroma speciosum (Malvaceae) populations in Mato Grosso, Brazil |
| topic | Biología Amazon cacauhy inbreeding microsatellite Genetic variability |
| url | https://www.redalyc.org/articulo.oa?id=44955366017 https://www.redalyc.org/journal/449/44955366017/ https://www.redalyc.org/journal/449/44955366017/html/ https://www.redalyc.org/journal/449/44955366017/44955366017.epub https://www.redalyc.org/journal/449/44955366017/movil |