Food For Thought, And For Raptors
An attempt to quantify the beneficial effects of raptors in rodent control. Gimme some numbers please!
Tag: pesticides
Flaming Gorge Osprey
The Osprey is a species that I’ve only had a handful of opportunities with but last spring I found a cooperative nesting pair at Flaming Gorge. In my mind this is a true miracle species because it has arisen Phoenix-like from the ashes of its own demise. During the 1950s-1970s their populations crashed dramatically, largely due to the effects of DDT and other persistent pesticides in the environment which caused severe eggshell-thinning and poor hatching success. But when those chemicals were banned the Osprey made a miraculous comeback and today their numbers are approaching historical highs. Part of the reason for that success has been the widespread use of artificial nesting sites. In some areas of North America, 90-95% of all nesting pairs choose these artificial sites over natural ones. The nest of this mated pair was on a pole installed for that purpose close to Flaming Gorge Reservoir. 1/1600, f/6.3, ISO 500, 500 f/4, 1.4 tc, natural light, cloned out a piece of nest platform, not baited, set up or called in This is most likely the male of the pair (less conspicuous breast band) bringing a small fish in to the incubating female on the nest platform. 1/2500, f/7.1, ISO 500, 500 f/4, 1.4 tc, natural light, not baited, set up or called in I believe this to be the female coming into the nest. 1/2000, f/7.1, ISO 500, 500 f/4, 1.4 tc, canvas added, natural light, not baited, set up or called in When the male would bring its mate a fish…
-
Flaming Gorge Osprey
The Osprey is a species that I’ve only had a handful of opportunities with but last spring I found a cooperative nesting pair at Flaming Gorge. In my mind this is a true miracle species because it has arisen Phoenix-like from the ashes of its own demise. During the 1950s-1970s their populations crashed dramatically, largely due to the effects of DDT and other persistent pesticides in the environment which caused severe eggshell-thinning and poor hatching success. But when those chemicals were banned the Osprey made a miraculous comeback and today their numbers are approaching historical highs. Part of the reason for that success has been the widespread use of artificial nesting sites. In some areas of North America, 90-95% of all nesting pairs choose these artificial sites over natural ones. The nest of this mated pair was on a pole installed for that purpose close to Flaming Gorge Reservoir. 1/1600, f/6.3, ISO 500, 500 f/4, 1.4 tc, natural light, cloned out a piece of nest platform, not baited, set up or called in This is most likely the male of the pair (less conspicuous breast band) bringing a small fish in to the incubating female on the nest platform. 1/2500, f/7.1, ISO 500, 500 f/4, 1.4 tc, natural light, not baited, set up or called in I believe this to be the female coming into the nest. 1/2000, f/7.1, ISO 500, 500 f/4, 1.4 tc, canvas added, natural light, not baited, set up or called in When the male would bring its mate a fish…