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Cited by 918

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Tropical Blackwater Rivers, Animals, and Mast Fruiting by the Dipterocarpaceae

Janzen, Daniel H.·1974·Biotropica

Abstract

Discusses four related ecological topics: (1) the occurrence of tropical blackwater rivers (rich in humic acids and poor in nutrients) in areas with poor white-sand soils; (2) the poverty of animal communities that occur in forests in such areas, (3) the evolution of gregarious fruiting in the Dipterocarps of SE Asia; and (4) the persistence of certain lowland tropical tree species in forests of very low species-diversity. In the hypotheses put forward, considerable attention is given to the role of 'secondary' or 'defensive' compounds (in general, phenolics that are toxic, difficult to degrade, and hence relatively persistent) in the living vegetation and in plant and litter leachates as a factor in the formation of blackwater rivers and in the defence of plants against attack by animals. The gregarious fruiting of Dipterocarps is seen as a mechanism of escape from seed consumers that is unique to the region concerned because it has reduced animal communities.

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Metadata

Authors
Janzen, D. H.
Venue
Biotropica
Publisher
JSTOR
Published
1974-07
Volume
6
Issue
2
Pages
69
ISSN
0006-3606 (ISSN-L)
OpenAlex
W2320023580
Cited by
918
References
1
FWCI
31.06
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Tropical Blackwater Rivers, Animals, and Mast Fruiting by the Dipterocarpaceae. https://app.cochat.ai/papers/10.2307/2989823
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Janzen, D. H. (1974). Tropical Blackwater Rivers, Animals, and Mast Fruiting by the Dipterocarpaceae. Biotropica. https://doi.org/10.2307/2989823

Data sources

Bibliographic data: Semantic Scholar, OpenAlex, Crossref.

Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.