Bumblebee populations in steep decline due to climate change in North America and Europe

Bumblebee populations in North America and in Europe are in steep decline and shrinking their ranges due to human caused climate change says new research. The study was conducted across two continents based on over 110 years of data and observations.

This has enormous implications for pollination and eco-system health, as well as for human agricultural productivity. Many trees and plants are dependant to varying extents for reproduction and fruit on pollination by insects including bumble bees.

What was thought to be just one of several factors affecting wild and domesticated bee populations, is now seen to be far more important. Factors affecting the decline of bee populations include Colony Collpase disorder, use of pesticides including neonicotinoids, habitat loss, low genetic diversity and high infection rates with the parasite pathogens, and climate-driven mismatch between the times when flowers open and when bees emerge. (See my 2011 article: A dangerous sting for agriculture: climate change implicated in bee decline)

Tropical insects face catastrophic reduction in reproduction with climate change

It looks like cold blooded species (ectotherms) in the tropics could be at an extreme risk of extinction with just moderate increases in temperature according to scientific studies. The latest study looked at the effects of increased temperature on the entire life cycle of one tropical ectotherm species, suggesting reproduction may suffer a catastrophic reduction as the climate warms with just moderate increases in tropical temperatures. The research has possible ramifications for all tropical ectotherms - Insects, spiders, frogs, snakes, turtles and other reptiles.

This is not the first indication that global warming impact on tropical species is greater than expected. Small increases in temperature in tropical ecosystems can have large impacts as many species are already near their thermal physiological maximum. Many species also have small dispersal ranges which increases their risk of extinction through small changes in habitat or environment.