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

What is the difference between ocean and lake sticklebacks?

One difference is the amount of protective armor that covers their bodies: while oceanic sticklebacks have about 30 armor plates extending from head to tail, most freshwater sticklebacks have just a handful of plates that sit closer to the front of the body.

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.

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Why are spines advantageous for marine stickleback fish but a disadvantage for freshwater stickleback fish?

Pelvic spines provide stickleback fish with a defense against such predators; however, pelvic spines appear to be a disadvantage in habitats without large-mouthed predatory fish and /or habitats with insects that can grab the spines, so that they can eat the fish.

What happened to sticklebacks 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.

Why do freshwater sticklebacks have less armor?

Shedding some genetically induced excess baggage may have helped a tiny fish thrive in freshwater and outsize its marine ancestors. Over the past 20,000 years – a relatively short time span in evolutionary terms – freshwater sticklebacks have lost their bony lateral plates, or ” armour,” in these new environments.

What caused sticklebacks to change?

New research shows that when two species of stickleback fish evolved and lost their pelvises and body armor, the changes were caused by different genes in each species. “A major challenge for biology is understanding the connections among evolving genomes, evolving populations and changing ecosystems.

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.

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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 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.

Is the stickleback a large or small fish?

Sticklebacks are small, elongated fishes that reach a maximum length of about 18 cm (7 inches). The members of the family are characterized by a row of 2 to 16 spines on the back, which are positioned in front of a soft-rayed dorsal fin.

Do freshwater sticklebacks have spines?

Seafaring stickleback fish sport a pair of prominent spines sticking out from their pectoral fins. Their freshwater cousins look far less threatening, outfitted with much smaller spines.

How do spines help stickleback fish?

The many stickleback populations underwent disparate and parallel evolutionary changes, among them partial or complete loss of their pelvic spines. These spines are thought to protect the fish from being devoured by predators.

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.

What can we infer from rejecting the null hypothesis in this particular experiment?

What does it mean when a null hypothesis is rejected? There is no statistically significant difference between the observed and expected data. There is no statistically significant difference between the observed and expected data. Therefore, the difference is due exclusively to chance.

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What can be inferred about the presence or absence of predatory fish when the Truckee formation was a lake?

Because pelvic spines in living three-spined stickleback populations provide a defenseagainst large predatory fish, we can infer that there probably were no predatory fish in the ancient lake.

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