Human disturbance affects parental care of marsh harriers and nutritional status of nestlings

Article Abstract:

The study of the consequence of human disturbance on marsh harriers (Circus aeruginosus) and their fledglings, conducted at Dos Reinos Lake, Ebro Valley, Spain, reveals that the nutritional condition of the nestlings is affected. There is an increase in the energy expenditure in the parents. The harriers spend less time in the nests particularly during incubation, and the chicks are poorly fed. Moreover, flight at high altitudes causes weariness among adults and reduces productivity.

Human beings, Humans, Harriers, Harriers (Birds)

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Predicting status change in red-cockaded woodpecker

Article Abstract:

Spatial characteristics had been identified as important in determining the cluster status of red-cockaded woodpecker. These are areas with cavity-tree, isolation or distance from other active cluster sites, distance from water and pasture, and timber corridors among cluster sites. An abandoned cluster site may be reactivated through timber corridors. It has also been found that availability of cavities also affect cluster density.

Environmental aspects, Woodpeckers, Nest building

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Predicting body mass in polar bears: is morphometry useful?

Article Abstract:

The body mass of polar bears is often used to indicate their health and nutritional condition. However. the difficulties in measuring the body mass of large mammals means that indirect methods, such as morphometric equations, are used, although they may not be precise or accurate. A new study of 914 polar bears, evaluating the usefulness of morphometry, concludes that it is an inaccurate and imprecise measurement technique.

Measurement, Body weight, Polar bear

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