Status and Threats
The black-throated blue warbler enjoys a large range and a big population. Its population trend is currently increasing. This species is ranked as Least Concern by the IUCN in 2012. Deforestation and habitat fragmentation are threatening the black-throated blue warblers in their tropical wintering areas. A report in 2000 discussed the impact of global climate change on the population dynamics of the black-throated blue warblers by an observation from 1986 to 1998. In particular, the effect of El Niño Southern Oscillation (ENSO) was studied in relation to the survival, fecundity and recruitment of this migratory bird. It was found that El Niño years (the warm oceanic phase) were associated with lower adult survival rate in their wintering ground, Jamaica, lower fecundity in the breeding habitats in New Hampshire of the United States, and lower annual recruitment of yearlings and juveniles to both breeding and wintering grounds. All the three factors were relatively higher during La Niña years when the weather was wetter and the food availability was much more abundant. The long-term global warming can aggravate the ENSO effect, adding to the fluctuation of the black-throated blue warbler population.
Read more about this topic: Black-throated Blue Warbler
Famous quotes containing the words status and/or threats:
“At all events, as she, Ulster, cannot have the status quo, nothing remains for her but complete union or the most extreme form of Home Rule; that is, separation from both England and Ireland.”
—George Bernard Shaw (1856–1950)
“Southerners, whose ancestors a hundred years ago knew the horrors of a homeland devastated by war, are particularly determined that war shall never come to us again. All Americans understand the basic lessons of history: that we need to be resolute and able to protect ourselves, to prevent threats and domination by others.”
—Jimmy Carter (James Earl Carter, Jr.)