Health & Environmental Research Online (HERO)


Print Feedback Export to File
7196753 
Journal Article 
Effects of natural field landscapes and Pinus plantations in diversity and genetic structure of small remnants populations of Araucaria angustifolia 
Freitas da Costa, NC; Guidolin, AF; Vargas, OF; Mantovani, A; , 
2015 
1 
Scientia Forestalis
ISSN: 1413-9324 
IPEF-INST PESQUISAS ESTUDOS FLORESTAIS 
PIRACICABA 
551-560 
WOS:000367705000006 
Landscape characteristics may structure genetic variation and affect the pollen flow of plant populations. To investigate the effects of field landscapes and Pinus plantations on genetic diversity and the structure of Araucaria angustifolia populations, eight microsatellite loci were used to analyze 400 seeds and 87 reproductive trees, present in four forest remnants (Patches). The studied patches are inserted into different landscape matrices, two in natural field (Farm X) and two in Pinus forestation (Farm Z). The analysis showed high population genetic diversity (He, ranged from 0.16 to 0.83) with no significant difference among adults. No differences between farms were verified by co-ancestry coefficient (F-FA = 0.002, P > 0.05). These results suggest that there was a historical connectivity between the locations. Significant fixation indices were detected in seeds from Farm Z (F = 0.076, P < 0.05) and in the total analyzed seeds (F = 0.052, P < 0.05), indicating allele fixation, possibly by crossing among relatives. The genetic divergence observed among adults and seed populations (F-AS = 0,029, P < 0.05) coupled with the presence of unique alleles in all populations, suggest that not all the genetic variability of the analyzed adults is being passed on to the seeds, especially in Farm Z. On the other hand, there was an important pollen contribution from outside patches for seed formation, in both farms.