Woodpeckers produce more youngsters when given extra food

Join date : 1970-01-01

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Providing extra food in early spring leads to earlier egg laying and increased productivity for the Great Spotted Woodpeckers.

Garden bird feeders have been reporting big increases in the numbers of Great Spotted Woodpeckers visiting gardens and feeding over the last 15 or so years. So we were not entirely surprised when we read a paper in the latest issue of Bird Study, the journal of the [You must be registered and logged in to see this link.], authors Ken and Linda Smith provide a potential explanation for the woodpeckers’ success.

In a mature oak wood local to us here in Hertfordshire, [You must be registered and logged in to see this link.] were provided with [You must be registered and logged in to see this link.] at 13 feeding stations distributed over half of a 100-ha study in Wormley Wood from early February until late April 2011, with the other half of the wood left unfed. In the spring of 2011 breeding attempts in the 'fed' zone were earlier, by an average of four or five days and birds there produced almost twice as many fledged youngsters as those in the unfed zone, even though the [You must be registered and logged in to see this link.] stopped before the main period of chick rearing.

Among the 60,000 BTO [You must be registered and logged in to see this link.], Ken and Linda Smith had been studying the woodland for the previous five years and found no differences between the zones in any of the previous years when no extra food was provided. The availability of caterpillars, the natural food for the breeding woodpeckers, was measured by using 'frass' traps to collect their droppings. 2011 was a very warm spring and the natural prey abundance peaked very early. This meant that none of the woodpeckers' breeding attempts were well synchronized with the emergence of the caterpillars. However, the small advancement in first egg date meant the supplemented birds were better synchronized than the birds that did not have access to suet blocks. Birds in the fed areas raised an average of 4.2 chicks per pair, compared to 2.1 chicks per pair in the unfed areas.

Ken Smith said "Having studied these birds for best part of 30 years, I was amazed at the difference extra food made in 2011. A few days' shift in egg laying date allowed them to be so much more productive."

The response of Great Spotted Woodpeckers to supplementary feeding suggests that they may be limited in their ability to shift their breeding period in response to the earlier boom in caterpillar numbers. This has important implications for the response of the birds to warm springs, which are expected to be more frequent under future climate change. By using feeders, Great Spotted Woodpeckers breeding in woodlands close to gardens may well be able to avoid problems caused by the changing timing of the spring season. By producing a big brood of youngsters, even in early springs, garden-feeding parents may be helping to fuel the current population increase.

love woodpeckers

saw some woodpeckers the other day, beautiful birds they are xx

there is one that goes to mams feeder

» some of the youngsters............
» an extra special baby...
» A few of my favourite photos - with a little extra work
» Fabio tries out a new food
» Hedgehog food