StudentShare
Contact Us
Sign In / Sign Up for FREE
Search
Go to advanced search...

Population Trends in Larids - Dissertation Example

Cite this document
Summary
This dissertation reveals the breeding population of great black backed, lesser black backed and herring gulls at coastal sites, that was definitively surveyed three times during the 20th century, in Operation Seafarer…
Download full paper File format: .doc, available for editing
GRAB THE BEST PAPER91.1% of users find it useful
Population Trends in Larids
Read Text Preview

Extract of sample "Population Trends in Larids"

Download file to see previous pages

ing gulls regionally, it was interesting to note that while the western colonies which were 10 times later than the eastern colonies in England during the seafarer census, the western colonies have declined by almost 27,000 pairs while the east coast colonies have steadily grown over the censuses. Although still much smaller than the west coast, it will be interesting to see if the decline in the west and increase in the east will continue. In striking contrast, at the seafarer census the east Scotland colonies were nearly three times those of the west coast.

However, by the seabird census the populations on the east and west coast of Scotland were virtually identical. When examining the herring gull by latitude one of the greatest differences noted is the drastic decrease of the population in the 56-58N latitude in particular. The huge colonies present at Seafarer had been decimated by the seabird census. In fact, much of the herring gull population has seen a phenomenal decrease in the latter part of the 20th century. Table of Contents1.0 Chapter 1 - Introduction 33.

0 Chapter 3 - Methodology 174.0 Chapter 4.0 - Results/Analysis 22Appendices 611.0 Chapter 1 - Introduction1.1 Background InformationThere have been 3 major surveys conducted in Britain and Ireland that have measured the breeding populations of great black backed, lesser black backed and herring gulls. These are the Operation Seafarer surveys, conducted in 1969-70; the Seabird Colony Register census, conducted in 1985-87; and Seabird 2000, conducted in 1998-2002. By analysis of the differences in the numbers observed in these three surveys, it is possible to show variation in population trends over time of these three very closely related bird species. Species. This dissertation reveals that gulls are known to feed at areas of sewage outflow to the sea, such as in the Bristol Channel.

It has been noted that they appear well adapted to feeding in polluted areas, as they have a well-developed detoxification system. There was a change in the numbers of lesser black backed gulls feeding at sewage outlets in South Wales, where a 289% increase in numbers between the 1970s and 1990s was observed in one study. However, it was also found that feeding from sewage outlets was overall much more common in black-headed gulls than lesser black backed or herring gulls, with 11% of the population of black headed gulls feeding at sewage outlets, compared to 3% for herring gulls and 7% for lesser black backed gulls.

In conclusion, there was also a difference in feeding patterns throughout the year, with far more gulls feeding at sewage outlets during the summer, compared to winter. This has a particular significance in that the summer is when breeding pairs are incubating and caring for offspring, which could then be affected by the parental diet. Refuse, whether sewage or on land, supports 43-75% of the diet of lesser black backed and great black backed gulls. However, it is often juvenile, non-breeding gulls that are found at sewage outlets, which means that offspring are less likely to be affected.

There has been a link between salmonellae occurrence in gulls and the number of human cases in local hospitals, with this being linked to a similar contaminated food source, as opposed to direct infection.

...Download file to see next pages Read More
Cite this document
  • APA
  • MLA
  • CHICAGO
(“Population Trends in Larids Dissertation Example | Topics and Well Written Essays - 11250 words”, n.d.)
Population Trends in Larids Dissertation Example | Topics and Well Written Essays - 11250 words. Retrieved from https://studentshare.org/biology/1519611-reproduction-trends-in-herring-lesser-black-backed-great-black-backed-gulls-in-britain-and-ireland
(Population Trends in Larids Dissertation Example | Topics and Well Written Essays - 11250 Words)
Population Trends in Larids Dissertation Example | Topics and Well Written Essays - 11250 Words. https://studentshare.org/biology/1519611-reproduction-trends-in-herring-lesser-black-backed-great-black-backed-gulls-in-britain-and-ireland.
“Population Trends in Larids Dissertation Example | Topics and Well Written Essays - 11250 Words”, n.d. https://studentshare.org/biology/1519611-reproduction-trends-in-herring-lesser-black-backed-great-black-backed-gulls-in-britain-and-ireland.
  • Cited: 0 times

CHECK THESE SAMPLES OF Population Trends in Larids

Study of Risk and Perceptions of Crime or Danger

The application of ‘crime trend study', in addition to other quantitative representations and qualitative analyses, to foresee the potential of crime has been utilized by a number of criminologists, creative thinkers and criminal justice legislators as a technique to predict future crime trends, to some extent so that the extent as well as impact of crime can be narrowed and even stopped during the years approaching....
9 Pages (2250 words) Essay

East Asiatic Company Nutrition

The following essay headlined "East Asiatic Company Nutrition" deals with the nutrition business.... As the text has it, launching its first milk product in Asia in 1953, it has extended its product offerings to a variety of milk powders commonly known by the brand name of Dumex, Mamex, and Mamil....
10 Pages (2500 words) Essay

Dental Treatment of Children

First and foremost, the fear that children may experience during the dental treatment must be regarded as the most contributory to aversion of children from undertaking it.... In this… gard, the parents, patient and and dentist, all experience frustration in carrying out the treatment plan (Savanheimo et al, 2005, pp 448 and 449, Acs et al, 2001, pp 419). In Canada, the most common way to access dental care is through dental insurance....
32 Pages (8000 words) Essay

Buyer- open to buy 1,214,000 for retail store- demographics

There are… The spring season has a number of effects on business, population growth or rather the demographic changes, the nutritional levels, and the general topography of In view of the various businesses available, I would like to deal with the women business suits during the spring season.... This is because business suits are widely accommodated by the general population....
4 Pages (1000 words) Essay

Strategic Plan for Abercrombie & Fitch

However, the company has diversified its products by innovating new trends in clothing and has adopted the changing demands of the consumers better than their competitors.... This research will present a strategic plan for Abercrombie & Fitch.... The SWOT analysis of the firm has been performed to find the internal and the external environmental situation of the company....
5 Pages (1250 words) Case Study

Census And Dating Prospects In California

The survey results helped in determining dating prospects since from 15 to 49 years, the percentage of male population lies between 7% and 6% compared to lower numbers of datable women.... It is advisable for men to stop worrying about women to date because the older population consists of an increased number of women who have opted out of relationships....
2 Pages (500 words) Assignment

Ladies First Transportation- Channel and Pricing Strategies

he United Kingdom has one of the vast transport industries involved in the service provided to most of its population.... This work called "Ladies First Transportation- Channel and Pricing Strategies" focuses on the introduction of Ladies-First Transportation as a new product in Great Britain and United States markets....
6 Pages (1500 words) Essay

Dental Caries: Causes, Determinants, and Communication

Conclusion This paper has identified the causes and determinants of dental caries in a population of elementary students.... From the discussion, it is clear that routine lectures can be used to communicate information on dental caries to the population with the view to reducing prevalence....
2 Pages (500 words) Essay
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.
Contact Us