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Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily
HOME > Lecture catalog / Research summary > Glossary > Interspecific interaction
Interspecific interaction (異種個体間相互作用)Interrelationships between populations
predation (捕食) (+/-) mutualism (双利共生) (+/+), commensalism (片利共生) (+/0) Antagonism (拮抗作用)Parasitism (寄生)[+ parasite, – host]Adelphoparasite (同種寄生): a parasite that is closely related to its host (e.g., both placed in the same family) Ectoparasite [+, -], external paratisism (外部寄生): a parasite living on the outside of its hosthaustorium (pl. -a, 吸器): that protion of a parasite that penetrates host cells and absorbs nutrients Endoparasite [+, -], internal paratisism (内部寄生): a parasite living within the hostIndexces of interspecific interaction
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(Armas et al. 2004) RIIBw = Bo + ΔBF - ΔBC
Bw: biomass observed by the target plant grown with other plants ΔBFC: observed biomass change = absolute effect of the interaction ∴ Bw - Bo = ΔBFC-Bo ≤ ΔBFC ≤ +∞ ΔBFC/Bw = ΔBFC/(ΔBFC + Bo)if only facilitation occurs, ΔBFC ranges from 0 to 1 |ΔBFC| ≤ |ΔBFC + Bo|
if only competition occurs, ΔBFC is negative but the above equation may not be true, as the index has an unlimited range [-∞ 0]
= ΔBFC/(ΔBFC + 2Bo) |
Def. competition in which individuals of different species compete for the same resources in an ecosystem
⇔ Intraspecific competition: competition between members of the same species |