Conservation biologists have altered the evolution of salmon populations in captive-breeding programs. Wild female salmon tend to produce fewer large eggs because the large eggs contain more nutrients for the off spring, giving each individual a greater chance to survive. After just a few generations, however, captive-bred females now lay greater numbers of small eggs. Suggest a possible adaptive advantage for many small eggs in the captive-bred environment. What would you predict regarding the reproductive success of captive-bred females released in the wild?

Conservation biologists have altered the evolution of salmon populations in captive-breeding programs. Wild female salmon tend to produce fewer large eggs because the large eggs contain more nutrients for the off spring, giving each individual a greater chance to survive. After just a few generations, however, captive-bred females now lay greater numbers of small eggs. Suggest a possible adaptive advantage for many small eggs in the captive-bred environment. What would you predict regarding the reproductive success of captive-bred females released in the wild?

Biology Today and Tomorrow without Physiology (MindTap Course List)

5th Edition

ISBN:9781305117396

Author:Cecie Starr, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Christine Evers, Lisa Starr

Chapter16: Population Ecology

Section: Chapter Questions

Problem 3DID

See similar textbooks

Similar questions

On the Bahamian island of Andros, mosquitofish populations live in various, now-isolated, freshwater ponds that were once united. Currently, some predator-rich ponds have mosquitofish that can swim in short, fast bursts; other predator-poor ponds have mosquitofish that can swim continuously for a long time. When placed together in the same body of water, the two kinds of female mosquitofish exhibit exclusive breeding preferences. If one builds a canal linking a predator-rich pond to a predator-poor pond, then what type(s) of selection should subsequently be most expected among the mosquitofish in the original predator-rich pond, and what type(s) should be most expected among the mosquitofish in the formerly predator-poor pond? stabilizing selection; directional selection stabilizing selection; stabilizing selection less-intense directional selection; more-intense directional selection less-intense disruptive selection; more-intense…
In populations subjected to high levels of predation a. individuals should invest little in reproduction so as to maximize their survival. b. individuals should produce few offspring and invest little in any of them. c. individuals should invest greatly in reproduction because their chance of surviving to another breeding season is low. d. individuals should stop reproducing altogether.
A sardine shoaling behavior shown below is observed in sardine fishing grounds in the country such as the Zamboanga Peninsula. Shoaling behavior happens when a massive number of sardines arrive to feed in coastal areas associated with high primary production due to upwelling. This massive number of arrivals also means a sardine feast for its predators such as tuna, barracuda, other piscivorous pelagic fish as well as sharks. What do you think is the adaptive value of shoaling behavior? How does "arriving in massive numbers" contribute to better chances of survival against an ensuing feast of predators?
Which of the following would be an appropriate hypothesis for an experiment? a.Sea urchins fertilization rate drops as carbon dioxide concentrations rise. b.Sea urchins living in kelp forests have higher fertilization rates than those living on rocks in intertidal areas. c.Sea urchin species spawning near other echinoderm species have lower fertilization rates. d.The concentration of phthalates in sea water reduces sea urchin fertilization rates. e.Sea urchins living in depths up to 10 meters have higher fertilization rates.
You are surveying of the turtle species identifies several breeding populations in different habitats across the island. After a very warm summer of 2020, you observe that the hatchlings from low-elevation nests are mostly males, whereas hatchlings from higher elevations have an equal female-to-male sex ratio. As a bit more background, temperature influences the sex ratio in some turtle species, a phenomenon called temperature-sex determination (TSD). With this knowledge, you hypothesize this new turtle species exhibits TSD, and that eggs incubated at low elevations during the warm year experienced a high enough embryonic temperature to skew the sex ratio. To test this, you collect 20 newly laid eggs in early 2021 & take them back to the lab to conduct an experiment to test your hypothesis that this species exhibits TSD. Assume you know the average nest temperature in the wild, and you have access to multiple incubators Design an experiment to test the hypothesis that this turtle…
K-selected reproductive strategies are favoured when adult survival is high, and populations are close to their carrying capacities. Explain the role of allocation in the evolution of such strategies in guppies
Tests on wild cheetahs have shown that there is low genetic diversity among individuals. Wildlife biologists and conservationists are worried about what this means for the survival of this species. Why is low genetic variability a big problem when it comes to a species survival in a changing habitat?
As a hypothetical example, imagine that you were studying a population of Eastern Collared-Lizards (Crotaphytus collaris). The lizards laid 2000 eggs, of which 1000 were eaten by raccoons and skunks. Eight hundred of the surviving juveniles were eaten by foxes and cats. One hundred and eighty of the young adults died during their first hibernation period. What is the indispensable mortality for each stage? If you want to increase the numbers of reproducing adults, which stage should you focus on?
Which of the following is NOT an example of an r-selected population? Select one: a. Mosquito lifespan is between 42 and 56 days for females and 10 days for males. b. Minnows spawn 16 to 26 times per year, yielding up to 10 000 eggs per female. c. Houseflies are very tolerant of a wide range of environmental conditions and thus have a broad range of habitat. d. Algae are capable of reproducing asexually and sexually to take advantage on the conditions of the environment.
If predators reduce prey abundance to very low levels, how might variable predator environments affect the evolution of flexible mating strategies?
Which of the following would be an appropriate hypothesis for an experiment in this lab? Which of the following would be an appropriate hypothesis for an experiment in this lab? Sea urchins living in kelp forests have higher fertilization rates than those living on rocks in intertidal areas. Sea urchin species spawning near other echinoderm species have lower fertilization rates. Sea urchins fertilization rate drops as carbon dioxide concentrations rise. The concentration of phthalates in sea water reduces sea urchin fertilization rates. Sea urchins living in depths up to 10 meters have higher fertilization rates.
Research and find a K-selected species (other than humans), and explain the pressures and resources that impact this strategy. Also explain how your chosen organism works to combat pressures of selection, resource availability, and environmental stressors that impact successful offspring production.