scientists have been studying ways to increase numbers of new populations of the
ID: 50720 • Letter: S
Question
scientists have been studying ways to increase numbers of new populations of the federally endangered red-cockaded woodpecker. Previous research has shown that the woodpecker prefer to colonize forests with naturally existing nesting holes, rarely moving into new territories with no holes. Scientists wondered if birds would move into new sites if they included trees with artificially constructed nesting cavaties. They hypothesized that birds would colonize these forests with artificially constructed cavaties. Desribe a possible experiment to test the hypothesis, including a control. State a prediction.
Experiment:
Control:
Prediction:
Explanation / Answer
The wood peckers belong to picidae family ,they are about 200 species and 30 generae .Many species are endangered because of habitat fragmentation ,two main species ivory billed woodpecker and imperial woodpecker have been considered to extinct 30 years ago .They will have strong ,longer ,sharper bill which drill holes in the tree .they have long sticky bills which aid in grabbing insects . they have adapted to protect their brain form damage form pecking like small brain size ,orientation of the skull . they are highly antisocial solitary species that are aggressive towards the other members of the species .some species are group living and some are mixed living species .
red billed woodpeckers are pale ,medium sized common in the forests,nesting ,they are ant eaters .nesting habits are diffrent . they lay eggs on the wood chips left over after excavating their nest cavity .nest holes are 22 to 33 cm deep with cylindrical living space of 9 cm to 13 cm .they nest in dead tree ,dead climbs of living trees .they excavate every year .incubation peiod of the eggs are 12 days.
Expeiment ;
vacant sites ,located 20 vacant sites which are suitable for the artifial nesting habits of wood pecker .in that 10 were 2 were complele cavities and 3 are fully drilled in old pine trees.
control ;
five control trees were selected in 10 vacant site s. abandonded sites which are unsuitable for nesting because of deterioation of the cavities in the site and studied the effect of hard wood removal on the trees by airing with bandonded trees.which were cleared .site was monitered and data was interrupted by asseing the difference in sucess of occupation and no occupation .by comparing with the control sites .
prediction ;
they are most likely to occupy the vacant experimental sites than vacant control sites .nine vacant expeimental sites were occupied .they also occupied abaonded sites but the sites with constructed cavities without hardwood .
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