Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 54, Problem 5Q
Summary Introduction
To review:
The shark population with a higher r-value and the shark population that has a higher chance of being overfished.
Introduction:
The tropical Australian sharpnose shark is small in size, fast-growing, has a short lifespan, matures early, and produces many offspring. The temperate shark is larger in size, slow-growing, has a longer lifespan, matures late in its life, and produces a few offspring.
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New Zealand snapper populations were found to be under the influence of genetic drift, suggesting overfishing was still an issue for them, despite the New Zealand fisheries estimating their total population size to be over 3 million. Which of the following is the best explanation for this observation?
A) Pelagic fish, like the New Zealand snapper, often only have a few reproductive individuals, therefore their effective population size is actually much smaller than the total population size.
B) Pelagic fish, like the New Zealand snapper, often have an equal sex ratio which affects the number of breeding individuals.
C) Pelagic fish, like the New Zealand snapper, often have disassortative mating which affects the number of breeding individuals.
D) Pelagic fish, like the New Zealand snapper, often have assortative mating which affects the number of breeding individuals.
https://media.hhmi.org/biointeractive/click/lionfish-invasion/introduction.html
This section starts explaining how scientists use the population survey data that are collected to model how the lionfish population changes over time. These models enable scientists to make predictions about population changes, which is an important element of developing plans for managing the lionfish population
You'll be using the discrete-time logistic model that is described on this page in future parts of the case study, so make sure to carefully read through the explanation of this mathematical model. Even if you don't have a strong math background, this case study walks through the equation step by step.
6)Which of the following are constant terms in the discrete-time logistic model?
choose all that apply
a)Nt
b)ΔN
c)t
d)K
e)Δt
f)rmax,d
g)None of these
Chapter 54 Solutions
Life: The Science of Biology
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- Milkfish (Chanos chanos) is the only fish species that belongs to Family Chanidae which is nearly related to tuna and salmon due to its fusiform shape and migratory nature (FAO 2009; BFAR 2020). It is widely distributed in the Indo-pacific region and abundantly collected in the South and Southeast Asian, and West Pacific Regions (BFAR 2010). Milkfish is one of the most commercially important fish species in the Philippines (Samson 1984). Milkfish reach sexual maturity (approximately 1.5m length and 20 kg weight) in five years in large floating cages, but may take 8-10 years in ponds and concrete tanks (FAO 2009). In the natural environment, milkfish populations near the coral reefs spawn during warm months of the year while populations near the equator spawn year-round. First-time spawners produce fewer eggs but larger and older broodstocks produce as many eggs as wild adults of similar size. Broodstocks of about 8 years old and about 6 kg produce 3-4 million eggs. Juvenile and adults…arrow_forwardMilkfish (Chanos chanos) is the only fish species that belongs to Family Chanidae which is nearly related to tuna and salmon due to its fusiform shape and migratory nature (FAO 2009; BFAR 2020). It is widely distributed in the Indo-pacific region and abundantly collected in the South and Southeast Asian, and West Pacific Regions (BFAR 2010). Milkfish is one of the most commercially important fish species in the Philippines (Samson 1984). Milkfish reach sexual maturity (approximately 1.5m length and 20 kg weight) in five years in large floating cages, but may take 8-10 years in ponds and concrete tanks (FAO 2009). In the natural environment, milkfish populations near the coral reefs spawn during warm months of the year while populations near the equator spawn year-round. First-time spawners produce fewer eggs but larger and older broodstocks produce as many eggs as wild adults of similar size. Broodstocks of about 8 years old and about 6 kg produce 3-4 million eggs. Juvenile and adults…arrow_forwardMilkfish (Chanos chanos) is the only fish species that belongs to Family Chanidae which is nearly related to tuna and salmon due to its fusiform shape and migratory nature (FAO 2009; BFAR 2020). It is widely distributed in the Indo-pacific region and abundantly collected in the South and Southeast Asian, and West Pacific Regions (BFAR 2010). Milkfish is one of the most commercially important fish species in the Philippines (Samson 1984). Milkfish reach sexual maturity (approximately 1.5m length and 20 kg weight) in five years in large floating cages, but may take 8-10 years in ponds and concrete tanks (FAO 2009). In the natural environment, milkfish populations near the coral reefs spawn during warm months of the year while populations near the equator spawn year-round. First-time spawners produce fewer eggs but larger and older broodstocks produce as many eggs as wild adults of similar size. Broodstocks of about 8 years old and about 6 kg produce 3-4 million eggs. Juvenile and adults…arrow_forward
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