Advanced search
1 file | 2.13 MB

Long-term dynamics in local host-parasite interactions linked to regional population trends

(2016) ECOSPHERE. 7(8).
Author
Organization
Abstract
Temporal changes in the relative abundances of host-parasite populations can influence the magnitude of the effects of corresponding interspecific interactions. When parasite populations are at relatively low abundance, the negative effects on host populations may be insignificant, but when parasite abundance increases beyond critical thresholds, they can have population limiting effects on the host. Here, we used data from a 40-yr demographic study on breeding Wood Thrushes (Hylocichla mustelina) and avian brood parasitic Brown-headed Cowbirds (Molothrus ater) in the mid-Atlantic United States to disentangle host-parasite interactions. The relative abundance for these two species has changed both locally and regionally over this time period with a reduction in host abundance coincident with an increase in the parasite population. We detected a fivefold increase in Brown-headed Cowbird parasitism rates of Wood Thrushes over the 40-yr time period leading to a reduction in Wood Thrush fitness (i.e.,adult survival, fecundity, and recruitment). After accounting for the effects of Wood Thrush age, individual, and annual and within-season variation in reproduction, we found that Wood Thrushes exhibited increased reproductive effort (produced more nests per year) as nest parasitism rates increased. Additionally, we found that as parasitism rates increased, both Wood Thrush clutch size and fecundity declined. In conjunction with widespread habitat loss and land use change on both wintering and breeding ranges, increasing rates of Brown-headed Cowbird parasitism are reducing Wood Thrush fitness, and are likely contributing to observed regional Wood Thrush population declines. Coordinated local and regional efforts to reduce Brown-headed Cowbird populations, particularly in fragmented landscapes, may help reduce the decline for Wood Thrushes, and likely other parasitized Neotropical migratory species.
Keywords
BROWN-HEADED COWBIRDS, CONSPECIFIC BROOD PARASITISM, WOOD-THRUSH, HABITAT QUALITY, NESTLING COMPETITION, SEASONAL FECUNDITY, MIGRATORY, SONGBIRD, PASSERINE BIRDS, MOLOTHRUS-ATER, PREDATION, brood parasitism, Brown-headed Cowbird, host-parasite interactions, Hylocichla mustelina, Molothrus ater, population dynamics, Wood Thrush

Downloads

  • (...).pdf
    • full text
    • |
    • UGent only
    • |
    • PDF
    • |
    • 2.13 MB

Citation

Please use this url to cite or link to this publication:

Chicago
Ladin, Zachary S, Vincent D’Amico, Jan Baetens, Roland R Roth, and W Gregory Shriver. 2016. “Long-term Dynamics in Local Host-parasite Interactions Linked to Regional Population Trends.” Ecosphere 7 (8).
APA
Ladin, Z. S., D’Amico, V., Baetens, J., Roth, R. R., & Shriver, W. G. (2016). Long-term dynamics in local host-parasite interactions linked to regional population trends. ECOSPHERE, 7(8).
Vancouver
1.
Ladin ZS, D’Amico V, Baetens J, Roth RR, Shriver WG. Long-term dynamics in local host-parasite interactions linked to regional population trends. ECOSPHERE. 2016;7(8).
MLA
Ladin, Zachary S et al. “Long-term Dynamics in Local Host-parasite Interactions Linked to Regional Population Trends.” ECOSPHERE 7.8 (2016): n. pag. Print.
@article{8510198,
  abstract     = {Temporal changes in the relative abundances of host-parasite populations can influence the magnitude of the effects of corresponding interspecific interactions. When parasite populations are at relatively low abundance, the negative effects on host populations may be insignificant, but when parasite abundance increases beyond critical thresholds, they can have population limiting effects on the host. Here, we used data from a 40-yr demographic study on breeding Wood Thrushes (Hylocichla mustelina) and avian brood parasitic Brown-headed Cowbirds (Molothrus ater) in the mid-Atlantic United States to disentangle host-parasite interactions. The relative abundance for these two species has changed both locally and regionally over this time period with a reduction in host abundance coincident with an increase in the parasite population. We detected a fivefold increase in Brown-headed Cowbird parasitism rates of Wood Thrushes over the 40-yr time period leading to a reduction in Wood Thrush fitness (i.e.,adult survival, fecundity, and recruitment). After accounting for the effects of Wood Thrush age, individual, and annual and within-season variation in reproduction, we found that Wood Thrushes exhibited increased reproductive effort (produced more nests per year) as nest parasitism rates increased. Additionally, we found that as parasitism rates increased, both Wood Thrush clutch size and fecundity declined. In conjunction with widespread habitat loss and land use change on both wintering and breeding ranges, increasing rates of Brown-headed Cowbird parasitism are reducing Wood Thrush fitness, and are likely contributing to observed regional Wood Thrush population declines. Coordinated local and regional efforts to reduce Brown-headed Cowbird populations, particularly in fragmented landscapes, may help reduce the decline for Wood Thrushes, and likely other parasitized Neotropical migratory species.},
  articleno    = {e01420},
  author       = {Ladin, Zachary S and D'Amico, Vincent and Baetens, Jan and Roth, Roland R and Shriver, W Gregory},
  issn         = {2150-8925},
  journal      = {ECOSPHERE},
  language     = {eng},
  number       = {8},
  pages        = {13},
  title        = {Long-term dynamics in local host-parasite interactions linked to regional population trends},
  url          = {http://dx.doi.org/10.1002/ecs2.1420},
  volume       = {7},
  year         = {2016},
}

Altmetric
View in Altmetric
Web of Science
Times cited: