Ecological consequences of primary and secondary seed dispersal on seed and seedling fate of Dipteryx oleifera (Fabaceae)
The relative contributions of primary and secondary seed dispersal to plant demography have received little investigation. Evidence on these seed dispersal types, on seed fate and seedling recruitment of the tropical rain forest tree Dipteryx oleifera, is presented. The study was conducted in a 6.37...
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Vicerractoría Investigación
2010-09-01
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| Series: | Revista de Biología Tropical |
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| Online Access: | http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442010000300014&lng=en&tlng=en |
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| author | Javier Ruiz Douglas H Boucher Luis F Chaves Cherryl Ingram-Flóres Delvis Guillén René Tórrez Oscar Martínez |
| author_facet | Javier Ruiz Douglas H Boucher Luis F Chaves Cherryl Ingram-Flóres Delvis Guillén René Tórrez Oscar Martínez |
| author_sort | Javier Ruiz |
| collection | DOAJ |
| description | The relative contributions of primary and secondary seed dispersal to plant demography have received little investigation. Evidence on these seed dispersal types, on seed fate and seedling recruitment of the tropical rain forest tree Dipteryx oleifera, is presented. The study was conducted in a 6.37ha permanent plot where seeds and seedlings were located and tagged for the 2007 cohort. A total of 2 814 seeds were threaded and their fate was followed one year after germination. Primary seed dispersal by bats protected seeds from insect larval predation below the adult tree. Bats congregated seeds in bat seed piles located at a mean distance of 40.94±1.48m from the nearest adult individual of D. oleifera. Terrestrial vertebrates congregated seeds in caches located 41.90±2.43m from the nearest adult individual of D. oleifera. The results of the fitted proportional hazard model suggested that primary seed dispersal decreased seed hazard probability by 1.12% for each meter from the adult conspecific (p<0.001) and that secondary seed dispersal decreased it by 23.97% (p<0.001). Besides, the odds ratio regression models results showed that the overall effect of unviable seeds was a reduction in viable seed predation rate. For each unviable seed deposited by bats into the seed piles, the rate of seed predation by terrestrial vertebrates decreased 6% (p<0.001). For each damaged seed by terrestrial vertebrates in the seed piles, the rate of germination decreased 4% (p<0.001). For each germinated seed in the seed piles, the rate of recruitment increased 16% (p=0.001). Seedling survival of seeds that emerged after secondary seed dispersal events, showed no statistically significant difference in arthropod herbivory, in relation to seedlings that came from seeds that were dispersed only primarily by bats (F=0.153, p=0.697, df=1.98). Thus both primary and secondary dispersal contributed to higher seedling survival away from the nearest adult D. oleifera (r2=0.713, n=578, p=0.004). The distribution of D. oleifera seedlings is consistent with the Janzen-Connell Hypothesis and depends on primary dispersal by bats, secondary dispersal by terrestrial vertebrates, a seed masking effect and, the constant threat of insect herbivores on seedlings. Rev. Biol. Trop. 58 (3): 991-1007. Epub 2010 September 01. |
| first_indexed | 2024-03-12T11:16:40Z |
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| language | English |
| last_indexed | 2024-03-12T11:16:40Z |
| publishDate | 2010-09-01 |
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| spelling | doaj.art-6816fc6afa0b4af1bfba3007e19320662023-09-02T01:53:20ZengVicerractoría InvestigaciónRevista de Biología Tropical0034-77442010-09-015839911007S0034-77442010000300014Ecological consequences of primary and secondary seed dispersal on seed and seedling fate of Dipteryx oleifera (Fabaceae)Javier Ruiz0Douglas H Boucher1Luis F Chaves2Cherryl Ingram-Flóres3Delvis Guillén4René Tórrez5Oscar Martínez6University of MichiganUnion of Concerned ScientistsUniversity of MichiganPrograma Científico ComplementarioUniversidades de las Regiones Autónomas de la Costa Atlántica de NicaraguaUniversidades de las Regiones Autónomas de la Costa Atlántica de NicaraguaUniversidades de las Regiones Autónomas de la Costa Atlántica de NicaraguaThe relative contributions of primary and secondary seed dispersal to plant demography have received little investigation. Evidence on these seed dispersal types, on seed fate and seedling recruitment of the tropical rain forest tree Dipteryx oleifera, is presented. The study was conducted in a 6.37ha permanent plot where seeds and seedlings were located and tagged for the 2007 cohort. A total of 2 814 seeds were threaded and their fate was followed one year after germination. Primary seed dispersal by bats protected seeds from insect larval predation below the adult tree. Bats congregated seeds in bat seed piles located at a mean distance of 40.94±1.48m from the nearest adult individual of D. oleifera. Terrestrial vertebrates congregated seeds in caches located 41.90±2.43m from the nearest adult individual of D. oleifera. The results of the fitted proportional hazard model suggested that primary seed dispersal decreased seed hazard probability by 1.12% for each meter from the adult conspecific (p<0.001) and that secondary seed dispersal decreased it by 23.97% (p<0.001). Besides, the odds ratio regression models results showed that the overall effect of unviable seeds was a reduction in viable seed predation rate. For each unviable seed deposited by bats into the seed piles, the rate of seed predation by terrestrial vertebrates decreased 6% (p<0.001). For each damaged seed by terrestrial vertebrates in the seed piles, the rate of germination decreased 4% (p<0.001). For each germinated seed in the seed piles, the rate of recruitment increased 16% (p=0.001). Seedling survival of seeds that emerged after secondary seed dispersal events, showed no statistically significant difference in arthropod herbivory, in relation to seedlings that came from seeds that were dispersed only primarily by bats (F=0.153, p=0.697, df=1.98). Thus both primary and secondary dispersal contributed to higher seedling survival away from the nearest adult D. oleifera (r2=0.713, n=578, p=0.004). The distribution of D. oleifera seedlings is consistent with the Janzen-Connell Hypothesis and depends on primary dispersal by bats, secondary dispersal by terrestrial vertebrates, a seed masking effect and, the constant threat of insect herbivores on seedlings. Rev. Biol. Trop. 58 (3): 991-1007. Epub 2010 September 01.http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442010000300014&lng=en&tlng=enunviable seedsseed maskingseedling demographyarthropod herbivoryNicaragua |
| spellingShingle | Javier Ruiz Douglas H Boucher Luis F Chaves Cherryl Ingram-Flóres Delvis Guillén René Tórrez Oscar Martínez Ecological consequences of primary and secondary seed dispersal on seed and seedling fate of Dipteryx oleifera (Fabaceae) Revista de Biología Tropical unviable seeds seed masking seedling demography arthropod herbivory Nicaragua |
| title | Ecological consequences of primary and secondary seed dispersal on seed and seedling fate of Dipteryx oleifera (Fabaceae) |
| title_full | Ecological consequences of primary and secondary seed dispersal on seed and seedling fate of Dipteryx oleifera (Fabaceae) |
| title_fullStr | Ecological consequences of primary and secondary seed dispersal on seed and seedling fate of Dipteryx oleifera (Fabaceae) |
| title_full_unstemmed | Ecological consequences of primary and secondary seed dispersal on seed and seedling fate of Dipteryx oleifera (Fabaceae) |
| title_short | Ecological consequences of primary and secondary seed dispersal on seed and seedling fate of Dipteryx oleifera (Fabaceae) |
| title_sort | ecological consequences of primary and secondary seed dispersal on seed and seedling fate of dipteryx oleifera fabaceae |
| topic | unviable seeds seed masking seedling demography arthropod herbivory Nicaragua |
| url | http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442010000300014&lng=en&tlng=en |
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