Obligate symbiosis in which one organism (parasite) lives at the expense of another (host), reducing host fitness. Distinct from predation (generally non-fatal), mutualism (positive for both), and commensalism (neutral for host).
Obligate symbiosis in which one organism (parasite) lives at the expense of another (host), reducing host fitness. Distinct from predation (generally non-fatal), mutualism (positive for both), and commensalism (neutral for host).