Nesting Success of a Hawaiian Honeycreeper Along an Altitudinal Gradient of Culicine Mosquitoes
EPA Grant Number: U915576Title: Nesting Success of a Hawaiian Honeycreeper Along an Altitudinal Gradient of Culicine Mosquitoes
Investigators: Nielsen, Bonnie M.
Institution: University of Idaho
EPA Project Officer: Broadway, Virginia
Project Period: August 1, 1999 through August 1, 2002
Project Amount: $40,366
RFA: STAR Graduate Fellowships (1999)
Research Category: Ecological Indicators/Assessment/Restoration , Academic Fellowships , Fellowship - Ecology and Ecosystems
Description:
Objective:Range reductions, extinctions, and population declines have been documented for Hawaiian honeycreepers (Passeriformes: Fringillidae: Drepanidinae) inhabiting low-elevation forests. Particularly interesting in considering the altitudinal trend of these declines is the opposite trend in abundance of the introduced night-biting mosquito (Culex quinquefasciatus), the primary vector of avian malaria (Plasmodium relictum). The specific objectives of this research project are to: (1) document nesting success of Apapane along the altitudinal gradient of C. quinquefasciatus mosquitoes; and (2) determine relationships between Apapane nesting success, elevation, and prevalence and infection status of C. quinquefasciatus within the nest vicinity.
Approach:The nesting success of 87 Apapane (Himatione sanguinea) nests and abundance of C. quinquefasciatus mosquitoes was monitored along an altitudinal gradient spanning 610-1,829 (2,000-6,000 feet) on the Kona Unit of the Hakalau Forest National Wildlife Refuge, Hawaii Island, in 1998-1999. The abundance of C. quinquefasciatus mosquitoes caught below each nest over 7 trap nights will be measured within 1 week of nest termination. Avian malaria (Plasmodium relictum) infection status will be quantified by examination of mosquito midguts for developing oocysts. Elevation was recorded at each nest.
Expected Results:The investigator proposes the hypothesis that reduced nesting success from greater exposure to avian-malaria vectors is a factor in reduced low-elevation Hawaiian honeycreeper populations. It is predicted that Apapane nesting success has a negative relationship with C. quinquefasciatus abundance and infection status and a positive relationship with elevation.
Supplemental Keywords:Hawaiian honeycreeper, Apapane, nesting success, Culex quinquefasciatus, mosquito gradient, elevation gradient, Hawaii, HI. , Ecosystem Protection/Environmental Exposure & Risk, Geographic Area, Scientific Discipline, RFA, Ecosystem/Assessment/Indicators, Biology, exploratory research environmental biology, Ecology, Ecological Indicators, Ecological Effects - Environmental Exposure & Risk, Ecosystem Protection, Ecology and Ecosystems, Environmental Monitoring, State, ecological research, Hawaii, Culicine mosquitos, bird habitat, Apapane, Hawaiian Honeycreeper, ecological assessment, changes in species composition, avain community composition, biological effects