Reproductive and genetic consequences of forest fragmentation: two case studies of neotropical canopy trees

Article Abstract:

Research into the impact of fragmentation on pollen flow in Neotropical populations of Spondias mombin (Anacardiaceae) and five monoecious species of Ficus (Moreceae) indicates that there is potential for ecologically and evolutionarily large pollinator and pollen movement among populations located in both continuous and fragmented forest environments. It was found that very different classes of small insect pollinators frequently travel very large distances between flowering trees. Conservationists have a particular interest in the dispersal biology and breeding structure of fig populations.

Seeds, Seed dispersal

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Electrophoretic evidence for tetrasomic inheritance in the dioecious tree Maclura pomifera (Raf.) Schneid

Article Abstract:

Patterns of staining intensity and heterodimer positions observed in gel electrophoresis indicate that the dioecius tree Maclura pomifera is an autopolyploid with tetrasomic inheritance. M. pomifera is endemic to North America, and the female plant produces large and many-seeded multiple fruits. The deviations from tetrasomic ratios observed in the segregation arrays are attributed to the double-reduction genotypes. Autopolyploidy, through production of unbalanced sex chromosome ratios, may be the reason for the peculiarity of sexual expression seen in these plants.

North America, Natural history, Polyploidy

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Breeding population size of a fragmented population of a Costa Rican dry forest tree species

Article Abstract:

Research is presented concerning the use of allozyme analyses to investigate the influence of pollen donor numbers on a fragmented population of Enterolobium cyclocarpum, a tropical dry forest tree species.

Analysis, Heredity, Isoenzymes, Tropical plants

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