Determine the food-searching activity, Biology

The Svalbard ptarmigan (Lagopus mutus hyperboreus) is a small herbivorous bird that lives permanently on the island chain of Svalbard. Svalbard is located in the Arctic Circle, approximately 700 km north of Norway at latitude 77-81°N. The Svalbard ptarmigan is the only bird that lives here all year; all other birds migrate to other locations during the winter months. It feeds on leaves, buds and berries from trees and shrubs on the islands

 

421_biology.png

 

Animals that live at this latitude are exposed to extreme conditions of weather and changes in photoperiod throughout the year. From mid-November to late January, the sun remains below the horizon, resulting in a continuous ‘polar night’. From mid-April until mid-August, the sun remains above the horizon, resulting in a continuous ‘polar day’.

Two research studies were carried out into the photoperiodic responses of the Svalbard ptarmigan. The results of these studies are presented over the page.

a) Comment on the extent to which the results support the following hypothesis:

That two independent biological clocks entrain food-searching activity.

(b) Comment on the extent to which the results support the following hypothesis:

 That the control of food-searching activity is more strongly entrained by access to food than by light-dark cycles.

(c) Considering both studies, discuss the signi?cance of the responses shown by the ptarmigan to its survival in its natural habitat.

Posted Date: 7/20/2013 2:40:28 AM | Location : United States







Related Discussions:- Determine the food-searching activity, Assignment Help, Ask Question on Determine the food-searching activity, Get Answer, Expert's Help, Determine the food-searching activity Discussions

Write discussion on Determine the food-searching activity
Your posts are moderated
Related Questions
Describe about the stomach

In general what is the cause of the aneuploidies? In general the aneuploidies are caused by impaired assortment of chromosomes during meiosis. For instance, when the homologous


Surgical Therapy The clinician may use a surgical approach when non-surgical therapies are not indicated or are unsuccessful. The surgical techniques are modified from those

Define Flow Phase in Physiological Response to injury? It is characterized by hyper metabolism, increased cardiac output, increased urinary nitrogen losses, altered glucose met

What is cDNA and what is its function and mechanism of action?

Q. How do you define Normal Pulmonary Vasculature? Pulmonary vessels are seen in the medial 2/3 of the lung. Vessels are generally not identified in the lateral third. The rad

natural selection

What is the Emperical evaluation Emperical evaluation based on: i) Time elapsed since stage one surgery - Considering the sigma cycle of bone formation in humans, a time pe

How the Wet beriberi Developed Rapidly? Oedema is the significant feature of wet beriberi. It may develop rapidly and involve not only the legs but also the face, trunk and ser