Question

exploring range of tolerance in steelhead trout
name: shaniah date
the range of tolerance in ecology is the values that an abiotic factor can reach without killing an organism. abiotic factors are the nonliving factors in an ecosystem (oxygen and temperature). if the values are above or below the range of tolerance, the organisms exposed to them die.

steelhead trout, otherwise known as rainbow trout, have seen a population decline in the western united states over the last several decades. steelhead are native to cold water streams where they hatched to reproduce. there are a wide variety of conditions for several years before returning to north america. they spawn in freshwater, then migrate to the ocean where they live that are threatening the population, including pollution, climate change, and invasive species.

use the data below to create a line graph showing trout numbers at different temperatures.

water temp (°c)	number of fish
2	2
4	7
6	14
8	22
10	17
12	13
14	8
16	3
18	1
20	1
22	0

graph template with water temperature (2-22) on x-axis and number of fish (2-22) on y-axis

1. the optimal range is the amount of an abiotic factor that produces the highest possible population. for water temperature, this would be about 6-10°c. label this area on the graph, and shade the region green.
2. the zone of physiologic stress occurs when an abiotic factor exists at levels that are too high or low to support normal biotic potential. label these two areas on the graph and shade the region yellow.
3. the zone of intolerance occurs when a population is absent (or in this case, nearly absent). label these two areas on the graph and shade the region red

Explanation:

To solve the problem of analyzing the range of tolerance for Steelhead Trout, we follow these steps:

Step 1: Understand the Data

The table provides the number of fish at different water temperatures. We need to plot this data on a line graph with water temperature on the x - axis and the number of fish on the y - axis.

Step 2: Plot the Data Points

• For \(x = 0\), \(y=0\)
• For \(x = 2\), \(y = 2\)
• For \(x=4\), \(y = 7\)
• For \(x = 6\), \(y=14\)
• For \(x = 8\), \(y = 22\)
• For \(x=10\), \(y = 17\)
• For \(x = 12\), \(y=13\)
• For \(x = 14\), \(y = 8\)
• For \(x=16\), \(y = 3\)
• For \(x = 18\), \(y=1\)
• For \(x = 20\), \(y = 1\)
• For \(x=22\), \(y = 0\)

Step 3: Identify the Optimal Range (6 - 10°C)

• Locate the temperature range \(6\leq T\leq10\) on the x - axis. The corresponding number of fish in this range is relatively high (14, 22, 17). Shade this area (between \(x = 6\) and \(x=10\)) green.

Step 4: Identify the Zone of Physiologic Stress

• The zone of physiologic stress occurs when the abiotic factor (temperature) is outside the optimal range but still allows some population to exist.
• For lower stress (colder than optimal): The temperature range \(2\leq T<6\) (number of fish: 2, 7) and for higher stress (warmer than optimal): \(10 < T\leq14\) (number of fish: 13, 8). Shade these two areas ( \(2\leq T<6\) and \(10 < T\leq14\)) yellow.

Step 5: Identify the Zone of Intolerance

• The zone of intolerance is where the population is nearly absent.
• For lower intolerance (colder): \(T < 2\) (number of fish = 0) and for higher intolerance (warmer): \(T>14\) (number of fish: 3, 1, 1, 0). Shade these two areas ( \(T < 2\) and \(T>14\)) red.

Final Graph Description

• X - axis (Water Temperature): Ranges from 0 to 22 °C.
• Y - axis (Number of Fish): Ranges from 0 to 22.
• Optimal Range (Green): Between \(x = 6\) and \(x = 10\).
• Zone of Physiologic Stress (Yellow): Between \(x=2\) and \(x = 6\) (left of optimal) and between \(x = 10\) and \(x=14\) (right of optimal).
• Zone of Intolerance (Red): Left of \(x = 2\) (\(T<2\)) and right of \(x = 14\) (\(T > 14\)).

(Note: Since the problem asks to create a line graph and label the areas, the above steps describe how to analyze and label the graph based on the given data and concepts of range of tolerance in ecology.)

Answer:

To solve the problem of analyzing the range of tolerance for Steelhead Trout, we follow these steps:

Step 1: Understand the Data

The table provides the number of fish at different water temperatures. We need to plot this data on a line graph with water temperature on the x - axis and the number of fish on the y - axis.

Step 2: Plot the Data Points

• For \(x = 0\), \(y=0\)
• For \(x = 2\), \(y = 2\)
• For \(x=4\), \(y = 7\)
• For \(x = 6\), \(y=14\)
• For \(x = 8\), \(y = 22\)
• For \(x=10\), \(y = 17\)
• For \(x = 12\), \(y=13\)
• For \(x = 14\), \(y = 8\)
• For \(x=16\), \(y = 3\)
• For \(x = 18\), \(y=1\)
• For \(x = 20\), \(y = 1\)
• For \(x=22\), \(y = 0\)

Step 3: Identify the Optimal Range (6 - 10°C)

• Locate the temperature range \(6\leq T\leq10\) on the x - axis. The corresponding number of fish in this range is relatively high (14, 22, 17). Shade this area (between \(x = 6\) and \(x=10\)) green.

Step 4: Identify the Zone of Physiologic Stress

• The zone of physiologic stress occurs when the abiotic factor (temperature) is outside the optimal range but still allows some population to exist.
• For lower stress (colder than optimal): The temperature range \(2\leq T<6\) (number of fish: 2, 7) and for higher stress (warmer than optimal): \(10 < T\leq14\) (number of fish: 13, 8). Shade these two areas ( \(2\leq T<6\) and \(10 < T\leq14\)) yellow.

Step 5: Identify the Zone of Intolerance

• The zone of intolerance is where the population is nearly absent.
• For lower intolerance (colder): \(T < 2\) (number of fish = 0) and for higher intolerance (warmer): \(T>14\) (number of fish: 3, 1, 1, 0). Shade these two areas ( \(T < 2\) and \(T>14\)) red.

Final Graph Description

• X - axis (Water Temperature): Ranges from 0 to 22 °C.
• Y - axis (Number of Fish): Ranges from 0 to 22.
• Optimal Range (Green): Between \(x = 6\) and \(x = 10\).
• Zone of Physiologic Stress (Yellow): Between \(x=2\) and \(x = 6\) (left of optimal) and between \(x = 10\) and \(x=14\) (right of optimal).
• Zone of Intolerance (Red): Left of \(x = 2\) (\(T<2\)) and right of \(x = 14\) (\(T > 14\)).

(Note: Since the problem asks to create a line graph and label the areas, the above steps describe how to analyze and label the graph based on the given data and concepts of range of tolerance in ecology.)