Host-specificity of folivorous insects in a moist tropical forest

1.  To assess the degree of herbivore host-specificity in the moist tropical forest on Barro Colourado Island, Panama, I conducted an extensive series of feeding trials on the common insect herbivores from 10 tree species. 2.  The herbivores were offered leaves from both congeneric and confamilial plant species to their known host species, as well as leaves from the most abundant tree species in the forest. 3.  The amount of damage caused by these herbivores to young, expanding leaves was also measured on nine of the tree species. 4.  Of 46 herbivores species (seven Coleoptera, one Orthoptera, 38 Lepidoptera), 26% were specialized to a single plant species, 22% were limited to feeding on a single genus and 37% were able to feed on several genera within a single family. The remaining 15% were generalists, able to feed from several different plant families. 5.  The causes of leaf damage varied extensively across the tree species. On average, specialist herbivores caused 58% of the damage to young leaves, generalists herbivores 8% and fungal pathogens 34%. For four of the tree species, pathogens were the most important cause of leaf damage. 6.  In this forest, most chewing herbivores appear to have fairly narrow diets, and these specialists are responsible for most of the insect herbivory.

[1]  R. Macarthur,et al.  Patterns of communities in the tropics , 1969 .

[2]  J. M. Scriber,et al.  Latitudinal Gradients in Larval Feeding Specialization of the World Papilionidae (Lepidoptera) , 1973 .

[3]  J. P. Grime,et al.  Evidence for the Existence of Three Primary Strategies in Plants and Its Relevance to Ecological and Evolutionary Theory , 1977, The American Naturalist.

[4]  W. W. Benson.  RESOURCE PARTITIONING IN PASSION VINE BUTTERFLIES , 1978, Evolution; international journal of organic evolution.

[5]  Thomas B. Croat.  Flora of Barro Colorado Island , 1978 .

[6]  P. Coley,et al.  Effects of leaf age and plant life history patterns on herbivory , 1980, Nature.

[7]  Terry L. Erwin,et al.  TROPICAL FORESTS: THEIR RICHNESS IN COLEOPTERA AND OTHER ARTHROPOD SPECIES , 1982 .

[8]  P. Coley,et al.  HERBIVORY AND DEFENSIVE CHARACTERISTICS OF TREE SPECIES IN A LOWLAND TROPICAL FOREST , 1983 .

[9]  J. Lawton,et al.  Insects on Plants , 1984 .

[10]  K. L. Olmstead,et al.  Latitudinal effects on treehopper species richness (Hornoptera: Membracidae) , 1984 .

[11]  M. Lowman.  Temporal and spatial variability in insect grazing of the canopies of five Australian rainforest tree species. , 1985 .

[12]  P. J. Edwards,et al.  The Ecology of a Tropical Forest. , 1985 .

[13]  F. Stuart Chapin,et al.  Resource Availability and Plant Antiherbivore Defense , 1985, Science.

[14]  S. Hubbell,et al.  Commonness and rarity in a neotropical forest: implications for tropical tree conservation , 1986 .

[15]  K. S. Brown.  Chemistry at the Solanaceae/Ithomiinae Interface , 1987 .

[16]  A. Dixon,et al.  Why There are So Few Species of Aphids, Especially in the Tropics , 1987, The American Naturalist.

[17]  D. Janzen.  Ecological Characterization of a Costa Rican Dry Forest Caterpillar Fauna , 1988 .

[18]  D. Janzen,et al.  Saturniid and Sphingid Caterpillars: Two Ways to Eat Leaves , 1988 .

[19]  N. Stork.  Insect diversity: facts, fiction and speculation* , 1988 .

[20]  D. Windsor.  Climate and moisture variability in a tropical forest : long-term records from Barro Colorado Island, Panamá , 1990 .

[21]  S. Hubbell,et al.  Presence and Absence of Density Dependence in a Neotropical Tree Community , 1990 .

[22]  I. Hodkinson,et al.  A lesser predilection for bugs : Hemiptera (Insecta) diversity in tropical rain forests , 1991 .

[23]  A. Gentry,et al.  Four Neotropical Rainforests , 1991 .

[24]  Y. Basset.  Host specificity of arboreal and free‐living insect herbivores in rain forests , 1992 .

[25]  Samuel M. Wilson.  Structure and History , 1993 .

[26]  M. Lowman,et al.  Measuring arthropod biodiversity in the tropical forest canopy. , 1995 .

[27]  S. Hubbell,et al.  Changes in tree species abundance in a Neotropical forest: impact of climate change , 1996, Journal of Tropical Ecology.

[28]  P. Coley,et al.  Anti-Herbivore Defenses of Young Tropical Leaves: Physiological Constraints and Ecological Trade-offs , 1996 .

[29]  J. A. Barone,et al.  HERBIVORY AND PLANT DEFENSES IN TROPICAL FORESTS , 1996 .