Mike,
in northern NSW there are many examples of the utilisation of artificial
structures and the provision of purpose-built structures and additions to
structures for nesting purposes. Sometimes this use can conflict with the
intended use or management of the original structure. Ospreys can also be
vunerable particularly on power poles - there have been several
electrocutions that I am aware of, and they can interfere with power
supplies and nests can become a fire hazard on active power poles.
Ospreys may be encouraged to nest in/at/on more appropriate locations/sites
where circumstances dictate (note may) - depends on various site
characteristics. Deterrants or even exclusion devices may be required at
former sites.
The importance of artificial structures in the recovery of the Osprey should
not be underestimated. I believe on average that artificial structures
produce more young per nest than natural nest sites as they are less prone
to collapse than the old dead trees that they naturally nest in. In the
Richmond valley two nest trees collapsed last year and we lost one only a
week or so back - we now have only one nest tree and eight or nine nests on
structures. It would be desirable in some circumstances for the authorities
to provide alternative nesting sites (poles with nest cradles) where
traditional natural nesting sites have failed. And yes birds whose natal
sites were on artificial structures may well only recognise such as nesting
sites when they mature (!!??).
I am happy to provide further info if requested.
Bob Moffatt
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