Use the following information to answer the next three questions Northern Leopard Frog (Rana pipiens) This Northern Leopard frog is found in a variety of habitats and is relatively cold-adapted. It is associated with a wide range of permanent water bodies, from ponds and marshes to streams and rivers. It can be found long distances from water, especially after rain. Prey items include insects and worms as well as small fish, or even frogs or tadpoles. Cannibalism has been reported. Unlike most other frogs, the northern leopard frog hibernates under water at the bottom of ponds. A biologist studied a population of Northern Leopard frogs in a wetland area in Alberta for 10 years. The initial population was 15 frogs. She determined that the natality averaged 40 frogs per year, the mortality averaged 30 per year, while immigration was 3 frogs per year, and emigration was 8 frogs per year. Numerical Response Q1. Calculate the growth rate (gr) of this population in the first year of the study. Growth Rate: ______ individuals/year (Record your two-digit answer in the numerical response section on the answer sheet.) Q2. Based on this information, what would be the population of Northern Leopard frogs in this study area at the end of ten years? Population Size in 10 years: ________ individuals Q3. Calculate the per capita growth rate (cgr) for this population of Northern Leopard frogs during the entire study period.
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Use the following information to answer the next three questions Northern Leopard Frog (Rana pipiens) This Northern Leopard frog is found in a variety of habitats and is relatively cold-adapted. It is associated with a wide range of permanent water bodies, from ponds and marshes to streams and rivers. It can be found long distances from water, especially after rain. Prey items include insects and worms as well as small fish, or even frogs or tadpoles. Cannibalism has been reported. Unlike most other frogs, the northern leopard frog hibernates under water at the bottom of ponds. A biologist studied a population of Northern Leopard frogs in a wetland area in Alberta for 10 years. The initial population was 15 frogs. She determined that the natality averaged 40 frogs per year, the mortality averaged 30 per year, while immigration was 3 frogs per year, and emigration was 8 frogs per year. |
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Numerical Response Q1. Calculate the growth rate (gr) of this population in the first year of the study. Growth Rate: ______ individuals/year (Record your two-digit answer in the numerical response section on the answer sheet.) Q2. Based on this information, what would be the population of Northern Leopard frogs in this study area at the end of ten years? Q3. Calculate the per capita growth rate (cgr) for this population of Northern Leopard frogs during the entire study period. |
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