Mating success and energetic condition effects driven by terminal investment in territorial males of a short-lived invertebrate
Article first published online: 20 FEB 2013
© 2013 The Authors. Functional Ecology © 2013 British Ecological Society
Special Issue: Plant–Microbe–Insect Interactions
Volume 27, Issue 3, pages 739–747, June 2013
How to Cite
González-Tokman, D. M., González-Santoyo, I., Córdoba-Aguilar, A. (2013), Mating success and energetic condition effects driven by terminal investment in territorial males of a short-lived invertebrate. Functional Ecology, 27: 739–747. doi: 10.1111/1365-2435.12072
- Issue published online: 23 MAY 2013
- Article first published online: 20 FEB 2013
- Manuscript Accepted: 9 JAN 2013
- Manuscript Received: 9 AUG 2012
- PAPIIT. Grant Numbers: 204610, 222312-3
- mating success;
- terminal investment
- The terminal investment hypothesis has two predictions: in the face of an infection (i) mature males will increase investment to traits that increase mating success, while such investments will occur to a less extent in young males; and (ii) physiological costs of resource reallocation will be more severe for infected mature males than for infected young males.
- Although these predictions have been tested in long-lived vertebrates, prior studies have not examined actual resource allocation conflicts. Here, we have tested the above predictions and have investigated the energetic costs of increased mating by old males, using a short-lived invertebrate, the damselfly Hetaerina americana. Males of this species defend territories as the main way to obtain access to females.
- Using groups of infected vs. noninfected males of two different ages, we found that compared to young infected males, mature infected males defended territories for longer, had higher mating success and directed agonistic behaviour to conspecific males more frequently. Despite similar immune responses by mature and young males, infected mature males ended up with less fat reserves compared to infected young males. This suggests that resource allocation conflicts are more severe for mature than for young males.
- In general, these results suggest that the terminal investment hypothesis applies in males of short-lived invertebrates and that a cause of increased mating success for males of advanced ages is reduced energetic stores.