FAQ: What Is The Difference Between Marine Sea-run And Freshwater Stickleback Fish Populations?

Which population of stickleback fish are more similar to marine stickleback fish Bear Paw Lake or Frog Lake?

The stickleback populations in Bear Paw Lake and Frog Lake are both freshwater populations; thus, they are more similar to one another in pelvic morphology than they are to marine and sea-run stickleback populations.

How is it proposed that freshwater stickleback fish evolved from marine populations?

Freshwater stickleback populations were established when some sea-run populations became trapped in lakes that formed at the end of the last ice age. These lakes were initially connected to the ocean, but were cut off as ice fields retreated.

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Why did you compare pelvic structures of stickleback populations from two different lakes?

In the virtual lab, why did you compare pelvic structures of stickleback populations from two different lakes? To have a larger number of specimens to score, increasing the accuracy of results. To compare the trait in stickleback populations living in two potentially different environments.

How did ancestral populations of ocean-dwelling fish?

How did ancestral populations of ocean – dwelling fish come to live in freshwater lakes? became trapped in these lakes and adapted to living exclusively in fresh water. populations have reduced armor.) Explain how the stickleback armor protects the fish from some predators.

Why are the stickleback fish in Frog Lake more similar to ocean and sea-run stickleback than they are to the stickleback fish in Bear Paw Lake?

Most stickleback fish in Bear Paw Lake have either a reduced or an absent pelvis, whereas those in Frog Lake have a complete pelvis. Thus, the stickleback population in Frog Lake is more similar to marine and sea – run stickleback populations.

Do you reject or fail to reject the null hypothesis for the data from each lake?

In Morvoro Lake, we cannot reject the null hypothesis. This may or may not mean that the null hypothesis is true.

How long do sticklebacks live for?

Many sticklebacks live for one year only, which makes his efforts to invest in paternity all the more vital.

Why did stickleback fish evolve?

Scientists have pinpointed mutations that may help a tiny armoured fish to evolve quickly between saltwater and freshwater forms. In as few as ten generations — an evolutionary blink of an eye — marine sticklebacks can swap their armoured plates and defensive spines for a lighter, smoother freshwater form.

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Can you keep sticklebacks in a tank?

Sticklebacks: The larvae controllers Like many native fish, they will happily live in water down to 4°C/39°F, but above 20°C/68°F they suffer, their metabolisms increasing considerably. In most unheated tanks of 18°C/ 64°F or under, they will do just fine.

What characteristics of stickleback fish make them ideal for studying natural selection in the wild?

What characteristics of stickleback fish make them ideal for studying natural selection in the wild? Stickleback populations are in environments with or without predators. Heritable variation in armor directly affects the fitness of sticklebacks. Some stickleback populations are isolated in closed environments.

How were the saltwater stickleback fish able to adapt to a freshwater environment so quickly quizlet?

How do spines protect ocean stickleback fish? As more and more ice melted, connections between some of the lakes and the ocean were cut off, and stickleback populations became trapped in these lakes. Because of this, they adapted to living exclusively in fresh water.

What happened to the fish in Bear Paw Lake as they adapted to living exclusively in freshwater?

What happened to these fish as they adapted to living exclusively in fresh water? As they adapted to life in fresh water, all stickleback populations living in lakes in Alaska underwent exactly the same evolutionary changes.

What 3 things have changed in the stickleback fish over time?

In freshwater, they faced weaker but faster predators, so they lost their spines and armour and became smaller and more agile. Their lifestyles, colour, mating habits, salt tolerance and diets also changed.

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How did spines protect the ancestral stickleback fish that lived in the ocean?

How do spines protect ocean stickleback fish? Protects from predators. How did ancestral populations of ocean -dwelling dish come to live in freshwater lakes? Sea -run stickleback fish got trapped in postglacial lakes.

Why do some stickleback populations lack spines?

Why do some stickleback populations lack pelvic spines? Pelvic spines are homologous to legs in four-legged animals and freshwater sticklebacks don’t need hind limbs to move. In lakes with dragonfly larvae, pelvic spines can be disadvantageous, allowing the predatory larvae to grab the fish.

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