env sc
Adrian Thomas
BIOL_115A_12-55
6/12/13
A population is consists of a group of the same species which occupy the same area. In order for a population to survive certain variables must be in place, making the biome ideal to support life for that and the other species within that community. There are some species that depends solely on the type of climate and food web that is available in a particular biome, these species would be considered to be specialists. Other species are able to adapt to the change of climate and eat a variety of items which aids in their survival and population growth. This paper will examine four species of birds in an effort to ascertain which species may be considered generalist / opportunistic and which species are specialist depending on specific climate or with a narrow niche preference. In order to providers with accurate information the writer will examine the environmental preference of these specific species, their diet, population growth and biome that provides the perfect living conditions for their species.
The four species being examined today are the American Robin, the Wood Stork, Great Blue Herron and the Double Crested Cormorant. The American Robin’s diet consists of a wide variety of berries earthworms and insects, and they are found throughout North America. Communities or Robins are found in several biomes, including forests edges, woodlands, grasslands, tundra and forests regenerating from recent fires, they are also found in populated urban areas since human development provides areas for them to forage. Although the Robin is a migratory species some of them have adapted to the cold and spend their entire lives in the colder regions of Northern America and Southern Canada. Although some American Robin is capable of adapting to several environments their diets are not so widespread in the summer they feast on insects and earthworms, while in the winters their diets mainly consists of berries. It is often hard to
BIOL_115A_12-55
6/12/13
A population is consists of a group of the same species which occupy the same area. In order for a population to survive certain variables must be in place, making the biome ideal to support life for that and the other species within that community. There are some species that depends solely on the type of climate and food web that is available in a particular biome, these species would be considered to be specialists. Other species are able to adapt to the change of climate and eat a variety of items which aids in their survival and population growth. This paper will examine four species of birds in an effort to ascertain which species may be considered generalist / opportunistic and which species are specialist depending on specific climate or with a narrow niche preference. In order to providers with accurate information the writer will examine the environmental preference of these specific species, their diet, population growth and biome that provides the perfect living conditions for their species.
The four species being examined today are the American Robin, the Wood Stork, Great Blue Herron and the Double Crested Cormorant. The American Robin’s diet consists of a wide variety of berries earthworms and insects, and they are found throughout North America. Communities or Robins are found in several biomes, including forests edges, woodlands, grasslands, tundra and forests regenerating from recent fires, they are also found in populated urban areas since human development provides areas for them to forage. Although the Robin is a migratory species some of them have adapted to the cold and spend their entire lives in the colder regions of Northern America and Southern Canada. Although some American Robin is capable of adapting to several environments their diets are not so widespread in the summer they feast on insects and earthworms, while in the winters their diets mainly consists of berries. It is often hard to
Cited: Aversa, Tom. "Seattle Audubon Society ." 19 october 1999. http://www.birdweb.org/birdweb/bird/black-necked_stilt. 12 06 2013. Gough, G.A., Sauer, J.R., Iliff, M. Patuxent Bird Identification Infocenter. 1998. Version 97.1. Patuxent Wildlife Research Center, Laurel, MD. http://www.mbr-pwrc.usgs.gov/id/framlst/infocenter.html