Parasite abundance decreases with host density: evidence of the encounter-dilution effect for a parasite with a complex life cycle
| Autor: | William I. Lutterschmidt, Julia C. Buck |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
0301 basic medicine Host (biology) Ecology Parasitism 030108 mycology & parasitology Aquatic Science Biology biology.organism_classification 010603 evolutionary biology 01 natural sciences Population abundance Lepomis 03 medical and health sciences Abundance (ecology) Parasite hosting Life history Posthodiplostomum minimum |
| Zdroj: | Hydrobiologia. 784:201-210 |
| ISSN: | 1573-5117 0018-8158 |
| Popis: | The relationship between host density and parasitism depends on a parasite’s life history. The abundance of a directly transmitted contagious parasite should increase with host density, whereas the abundance of a directly transmitted parasite that seeks its host might decrease due to the encounter-dilution effect. For parasites with complex life cycles, previous studies have found no association between parasite abundance and host density. We tested the relationship between host density and metacercarial abundance of a trematode parasite (Posthodiplostomum minimum) in two species of centrarchid fishes (Lepomis macrochirus and L. auritus) from eight small creeks. We found that host density was negatively associated with parasite abundance. Thus, our study represents the first evidence of the encounter-dilution effect for a parasite with complex life cycle in a natural system. We also report a positive association between total P. minimum population abundance and Lepomis spp. density, indicating that at low host density, cercarial mortality could moderate the encounter-dilution effect. |
| Databáze: | OpenAIRE |
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