After the boom-bust-boom of the fifties and sixties, the borough went into a third and more severe decline again in the mid-1970s along with much of the Rust Belt so that population was just 2,804 at the 2000 census. Now in the 2011 Brownsville still has a handful of buildings condemened or just borded up.
One threat to these Savanna biomes is the animals which graze upon it. Other biomes such as Taiga or Rainforest have a high tree quantity which means that less grass is able to grow for animals to graze on. However, since Savannas have few trees and much wide open space than other biomes an herbaceous layer grows much easier.
The biotic factors of a tropical savanna includes vegetation that is dominated by different types of tall grasses with some shrubs and trees. The animals tend to be bigger than in the jungles.The abiotic factors of the tropical savanna include frequent fires from seasonal lightning, seasonal rainfall, times of drought and times of great rains, high temperatures, and a compact soil.What they mean.Abiotic factors are chemical and physical factors of the environment like climate and soil type - 'non biology'.he abiotic factors of the tropical savanna include frequent fires from seasonal lightning, seasonal rainfall, times of drought and times of great rains, high temperatures, and a compact soil. What they mean. Abiotic factors are chemical and physical factors of the environment like climate and soil type - 'non biology'.