Turn to Do Now Section in Notebook Merlin Nia’Milika Kiara Terrence Tyrik Toreal Leonard Zyriah Odaisha Leroyal Jourdan Da’janae M. Da’janae R. Kevin Renee Chevonne Romad Anthony Garyell Thuy Shaheem Jada Arell Kailand Marcus Jeremie Jaelan Kiffy Braxton Crystell Directions: Turn to Do Now Section in Notebook

2.17 Do Now Volume 0 – Complete Sentences A population of squirrels in Louisiana was significantly reduce after Hurricane Ivan. Meanwhile, a population of squirrels in Wisconsin was significantly reduced after a few hawks joined their habitat. Which one of these factors is density dependent? Why? What do you think caused the population to quit growing in the second graph below? Explain your reasoning.

How Populations Grow Growth rates tend to change depending on the resources available to the organisms in the population There are two basic patterns of population growth: Exponential Logistic

Exponential Growth: Exponential Growth: when a population increases by a fixed percentage each year Usually occurs when a small population of organisms are introduced to a new environment with ideal conditions Normally not sustained for very long because the resources of the environment are limited

Logistic Growth Logistic growth: describes how a population’s initial exponential growth is slowed and finally stopped by limiting factors Limiting factors: characteristics/factors of the environment that limit population growth; determine population’s carrying capacity

Exponential Growth Curve Type: J-Shaped Explanation: Every incremental increase in number (of individuals) is larger than the one before it

Logistic Growth: Explanation: Curve Type: S-shaped Explanation: Displays how population size follows this order: increases rapidly at first grows more slowly stabilizes at carrying capacity

Everybody Writes What would happen if cougars grew exponentially for 100 years? Be graphic and imaginative in 2-3 complete sentences.

Carrying Capacity Carrying capacity is the largest population size a given environment can sustainably support Populations fluctuate above and below carrying capacity Fluctuations caused by changes in birth rates and death rates Changes in birth rates and death rates are caused by density dependent limiting factors Density dependent limiting factors include…

Achieve 3000 Leave the Corals Alone (Deadline: today at 11:59 pm.) Who Gets to Stay (Deadline: today at 11:59 p.m.) Components to Complete: - Before reading poll - Article - Activity - After Reading Poll