What factor contributed to the selection of the Long Neck trait in tortoises?
For example, Darwin observed a population of giant tortoises in the Galápagos Archipelago to have longer necks than those that lived on other islands with dry lowlands. These tortoises were “selected” because they could reach more leaves and access more food than those with short necks.
What is significant about the shapes of the tortoise shells in the Galapagos Islands?
Galápagos giant tortoises have two main shell morphologies – saddleback and domed – that have been proposed to be adaptive. The more sloped shape on the sides of the shell and the longer extension of neck and legs of the saddlebacks could have evolved to optimize self-righting.
Why are the giant tortoises so different on the different islands of the Galapagos quizlet?
How did tortoises and birds differ among the islands of the Galapagos? The tortoises on the Galapagos Islands all had different shaped shells; therefore they were different species of the same category of tortoises.
What did Darwin learn about the land tortoises of the different Galapagos Islands?
Darwin noticed that different tortoise species lived on islands with different environments. He realized that the tortoises had traits that allowed them to live in their particular environments. For example, tortoises that ate plants near the ground had rounded shells and shorter necks.
What are examples of adaptation?
An example of a structural adaptation is the way some plants have adapted to life in dry, hot deserts. Plants called succulents have adapted to this climate by storing water in their short, thick stems and leaves. Seasonal migration is an example of a behavioral adaptation.
What was Darwin’s argument about the necks and shells of tortoises on these islands?
Darwin noticed that different tortoise species lived on islands with different environments. He realized that the tortoises had traits that allowed them to live in their particular environments. For example, tortoises that ate plants near the ground had rounded shells and shorter necks.
What adaptation did tortoises on more arid or dry islands have?
Saddle-backed shells evolved on the arid islands in response to the lack of available food during drought. The front of the carapace angles upward, allowing the tortoise to extend its head higher to reach the higher vegetation, such as cactus pads.
What is an example of how animals were adapted for their specific environments on the Galapagos Islands?
Because there were no large predators on these two Galapagos Islands, having wings was a disadvantage that prevented them from finding food easily. They're wings therefore adapted to be smaller while they developed powerful legs and webbed feet to dive into the water to hunt for fish, eels and small octopus.
How do tortoises differ among the Galápagos Islands What causes these differences?
Galapagos tortoises have two very different shapes, each adapted for different feeding habits needed on low, arid islands versus high, lusher islands.
Why did Darwin’s observations of Galapagos tortoises cause him to wonder how species originate?
Why did Darwin's observations of Galapagos tortoises cause him to wonder how species originate? People who lived on the islands could even tell the island a turtle came from by its shell. This started Darwin thinking about the origin of species. He wondered how each island came to have its own type of tortoise.
What difference in physical characteristic did Darwin notice in the tortoises on different islands?
Darwin noticed that the plants and animals on the different islands also differed. For example the giant tortoises on one island had saddle-shaped shells while those on another island had dome-shaped shells (see Figure below). People who lived on the islands could even tell the island a turtle came from by its shell.
What did Darwin notice during his time in the Galapagos Islands about the finches?
On the Galapagos Islands, Darwin also saw several different types of finch, a different species on each island. He noticed that each finch species had a different type of beak, depending on the food available on its island. The finches that ate large nuts had strong beaks for breaking the nuts open.
What is adaptation give the 3 types of adaptation?
Adaptations are unique characteristics that allow animals to survive in their environment. There are three types of adaptations: structural, physiological, and behavioral.
What are the 3 types of adaptation?
The three basic types of adaptations, based on how the genetic changes are expressed, are structural, physiological and behavioral adaptations. Most organisms have combinations of all these types.
What is adaptation Charles Darwin?
Abstract. A Darwinian adaptation is an organism's feature that was functionally designed by the process of evolution by selection acting in nature in the past.
What kind of adaptation is a long neck on a tortoise?
Their long neck allows them to find food in places that their bodies cannot fit into. Due to the length of their necks, they cannot pull their head into their shells. The turtle has a hard shell for defense against its many predators.
Why did the tortoises have differently shaped shells depending on the island they were found?
Galápagos tortoises have differently shaped shells depending on which island they inhabit. Tortoises with saddle-shaped shells can reach up to eat plant leaves above their head. Tortoises with dome-shaped shells cannot reach up in this way.
Can you tell from the figure how closely the three tortoise species resemble the ancestral species?
Can you tell from Figure 15-1 how closely the three tortoise species resemble the ancestral species? Why or why not? No, the diagram does not provide information on the ancestral species. Vegetation on Hood Island is sparse and sometimes hard to reach.
What adaptations might be useful to island dwelling animals?
These adaptations include a short, blunt stout, a long, flat, incredibly strong tail that propels it through the water, and a special gland that allows it to expel excess salt from its body.
How is tortoise adapted to life on land?
Tortoises have many adaptations that help them survive, such as scutes, protective scales on tortoise shells that protect them from injury. They dig burrows, tunnels or holes in the ground, so they can hide from predators and hibernate for the winter.
What distinguishes Galápagos tortoises from island to island?
NARRATOR: The Galapagos Islands take their name from the giant land tortoises found there. Tortoises from different islands can be identified by the shape of their shells, which appear to have evolved into two main types with slight variations.
What are two examples of adaptation that Darwin observed on the Galapagos Island?
Upon further study, he realized that the varied beaks of each finch helped the birds acquire a specific type of food. For example, seed-eating finches had stronger, thicker beaks for breaking seeds, and insect-eating finches had spear-like beaks for stabbing their prey.
Which of the following ideas is supported by Darwin’s observation of local variation among tortoises in the Galápagos Islands?
Q. Which of the following ideas is supported by Darwin's observation of local variation among tortoises in the Galápagos Islands? experimenting with animals.
What would the islanders tell about the tortoises on the Galapagos?
What could the islanders tell about the tortoises on the Galapagos? The islanders could tell which island the tortoises came from by looking at their shell.
What are 3 examples of animal adaptations?
The shape of a bird's beak, the color of a mammal's fur, the thickness or thinness of the fur, the shape of the nose or ears are all examples of physical adaptations which help different animals survive. Animals also have behavioral adaptations that have to do with their actions.
What are 3 structural adaptations?
A STRUCTURAL ADAPTATION is an inherited body structure. Webbed feet, sharp claws, beak type, wings for flying, feathers, fur, scales, spines, thorns, or types of leaves, can all help organisms survive in an environment.
What is the behavioral adaptation?
Behavioral adaptation: something an animal does usually in response to some type of external stimulus in order to survive. Hibernating during winter is an example of a behavioral adaptation.
What adaptations do tortoises have?
Tortoises have many adaptations that help them survive, such as scutes, protective scales on tortoise shells that protect them from injury. They dig burrows, tunnels or holes in the ground, so they can hide from predators and hibernate for the winter.
What are 3 adaptations of a turtle?
Freshwater turtles are strong swimmers. They have modified hands and feet that have become flippers. These flippers enable them to swim and dive. The neck of the freshwater turtle is fused to its body by thick connective tissue, an adaptation that reduces drag and increases the turtle's ability to swim effectively.
How different shaped shells depend on the island?
Galápagos tortoises have differently shaped shells depending on which island they inhabit. Tortoises with saddle-shaped shells can reach up to eat plant leaves above their head. Tortoises with dome-shaped shells cannot reach up in this way.