Effect of Microhabitat on Seed Fate and Seedling Performance in Two Rodent- Dispersed Tree Species in Rain Forest in French Guiana

1997 ◽  
Vol 85 (5) ◽  
pp. 693 ◽  
Author(s):  
Pierre-Michel Forget
Keyword(s):  
Tree Species ◽  
Rain Forest ◽  
French Guiana ◽  
Seed Fate ◽  
Seedling Performance

La phénologie des arbres caducifoliés en forêt guyanaise (5° de latitude nord) : illustration d'un déterminisme à composantes endogène et exogène

1994 ◽  
Vol 72 (12) ◽  
pp. 1843-1857 ◽  
Author(s):  
Denis Loubry
Keyword(s):  
Key Words ◽  
Tree Species ◽  
Rain Forest ◽  
Tropical Rain Forest ◽  
French Guiana ◽  
Dry Season ◽  
Deciduous Tree ◽  
Leaf Fall

The French Guianan forest is an evergreen rain forest that contains approximately 100 deciduous tree species. The taxonomical distribution of the deciduous character is widely spread, and its presence or absence among some taxa, as well as its ancient origin, are arguments in favour of an endogenous origin. Leaf-fall periodicity was studied on a sample of 500 trees during a 2-year period. Periodicity is annual and seasonal. It is not correlated to rainfall and not linked to the occurrence of a dry season. It seems closely correlated to photoperiodical variations, even though those variations are weak (35 min at latitude 5°30′N). However, each tree has its own periodicity for leaves shedding. Therefore, there is a paradox between seasonality and individual periodicity of leaf fall. The existence of this paradox leads us to consider the hypothesis of an integration of endogenous and exogenous components in the determination of leaf-fall periodicity. Key words: deciduousness, French Guiana, phenology, photoperiodism, tree, tropical rain forest.

Photosynthetic induction in saplings of three shade-tolerant tree species: comparing understorey and gap habitats in a French Guiana rain forest

Oecologia ◽  
2000 ◽  
Vol 125 (3) ◽  
pp. 331-340 ◽  
Author(s):  
Toon Rijkers ◽  
Peter Jan de Vries ◽  
Thijs L. Pons ◽  
Frans Bongers
Keyword(s):  
Tree Species ◽  
Rain Forest ◽  
French Guiana ◽  
Photosynthetic Induction

Frugivores and seed removal at Tetragastris altissima (Burseraceae) in a fragmented forested landscape of French Guiana

2005 ◽  
Vol 21 (5) ◽  
pp. 501-508 ◽  
Author(s):  
Sandra Ratiarison ◽  
Pierre-Michel Forget
Keyword(s):  
Tree Species ◽  
French Guiana ◽  
Primate Species ◽  
Seed Removal ◽  
Seed Fate ◽  
Cascading Effects ◽  
Continuous Forest ◽  
Low Efficiency ◽  
Animal Community ◽  
The Impact

We aimed at (1) determining how community-wide disruptions affect visitation by frugivores at trees and (2) estimating the impact of visitation shifts on seed fate following fruit consumption, especially seed removal. We compared the seed fate of a frugivore-dispersed tree species (Tetragastris altissima, Burseraceae) in four forested islands with that for a mainland continuous forest at Saint-Eugène, French Guiana. Tetragastris trees attracted opportunistic frugivore species available in the area, the most productive trees attracting more consumer species. Only primates, which are more susceptible to forest disturbances than birds and have low abilities to cross a non-forested matrix, were more frequent at Tetragastris on the mainland than on islands. Only opportunistic frugivorous primate species acting as low-efficiency seed dispersers were recorded. As a result, seed removal was equally low among habitats (nearly 26%), high percentages of seeds dropping below tree crowns. The scarcity of large-bodied specialist frugivorous primates throughout the landscape probably explained this low removal. Our results underline how difficult it is to generalize the cascading effects of disruptions in a frugivore community on tree seed fate, these effects likely varying according to the tree species and animal community involved.

Removal of seeds of Carapa procera (Meliaceae) by rodents and their fate in rainforest in French Guiana

1996 ◽  
Vol 12 (6) ◽  
pp. 751-761 ◽  
Author(s):  
Pierre-Michel Forget
Keyword(s):  
Seed Predation ◽  
Tree Species ◽  
French Guiana ◽  
Removal Rate ◽  
Seed Removal ◽  
Seed Fate ◽  
Wet Season ◽  
Adult Trees ◽  
Carapa Procera ◽  
Monthly Variations

ABSTRACTExperiments were performed to investigate monthly variations in seed fate of Carapa procera (Meliaceae), a rodent-dispersed subcanopy tree species in French Guiana. A total of 600 thread-marked seeds were placed on the ground in mature forest under 20 adult trees during different months (March, April and May 1991) of the species' fruiting season. In 1991 the seed crop reached 1536 seeds in the study area, with a majority of seeds being produced in March and May. On average, seed removal rate steadily increased from March (23%) to May (96%). Of the seeds removed, the proportion eached almost doubled between March (28%)-April (25%) and May (48%), whereas the proportion eaten (gnawed) steadily declined between March (43%) and May (9%). Approximately 75–100% seed removal was therefore associated with intense scatterhoarding and low seed predation, especially in May. Greater seed dispersal rates occurred during the late wet season when fruit diversity decreased but when overall fruit biomass peaked because of fruiting occurrence of large-seeded species. The seasonal hoarding behaviour of rodents is discussed.

The importance of wood density in determining the phenology of tree species in a coastal rain forest

Biotropica ◽  
2021 ◽  
Author(s):  
Fernanda Gomes Galvão ◽  
André Luiz Alves de Lima ◽  
Clemir Candeia de Oliveira ◽  
Valdemir Fernando Silva ◽  
Maria Jesus Nogueira Rodal
Keyword(s):  
Wood Density ◽  
Tree Species ◽  
Rain Forest

Diversity and vertical distribution of epiphytic liverworts in lowland rain forest and lowland cloud forest of French Guiana

2013 ◽  
Vol 35 (4) ◽  
pp. 243-254 ◽  
Author(s):  
Christine Gehrig-Downie ◽  
André Obregon ◽  
Jörg Bendix ◽  
Robbert Gradstein
Keyword(s):  
Vertical Distribution ◽  
Rain Forest ◽  
French Guiana ◽  
Cloud Forest ◽  
Lowland Rain Forest
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