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Questions tagged [migration]

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1answer
55 views

What's the smallest flier that migrates?

Painted ladies and monarchs migrate hundreds of miles (~1.61 hundreds of kms). Are there long distance fliers that are significantly smaller? Dual question: Are fliers' migration distances strictly ...
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0answers
19 views

Do vagrant birds who move to non-native areas just die out?

As many birders know, frequently a bird will travel a long way from its usual environs and appear out of its range. For example, recently a great black hawk (a southern hemisphere species) has come to ...
0
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1answer
290 views

Island model vs. stepping stone model

Wright's Island model and Kimura's stepping stone model are classic explanations for migration/gene flow o individuals between subpopulations within the field of population genetics. My question ...
4
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2answers
90 views

Do birds change their diet before migration?

Migration takes up a lot of energy, so I am wondering if birds (in my case mallards) change their diet / food preferences in the weeks before migrating. Do they select for more energetic foods to fuel ...
1
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1answer
62 views

Simulating Migration in SimBit Software Program

How is migration incorporated into the SimBit program of Remi Matthey-Doret and Michael Whitlock? Is an island model or stepping stone model assumed?
3
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1answer
154 views

Correct migration rate expression in infinite island model

In Sewall Wright's infinite island model, where all demes exchange migrants each generation, I have seen the migration rate stated variously as $m$ or $\frac{m}{d - 1}$ (as in Matthew B. Hamilton's ...
1
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0answers
262 views

How do migrating geese handle hurricanes?

I live on the East coast of the United States, where we are in hurricane season. This week during my morning bike rides in Charlotte, North Carolina, I have seen migrating Canadian geese. I'm curious ...
2
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0answers
23 views

Population-biology, migration-patterns, & ethology of the Big Five (elephants, rhinos, lions, leopards, & buffalo) in S. Africa's winter months?

I know that animals are unpredictable, but I also know that there are seasons in which the wildlife are more active. Now, August in South Africa is still their winter season, which is emerging into ...
3
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0answers
56 views

Can immune cells be recruited to an area of inflammation, and later go on to a second?

With regards to innate or adaptive immune cells... can naive/immature cells such as neutrophils, monocytes, macrophage/dendritic cells or adaptive T-cells be recruited to an area of inflammation, for ...
2
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1answer
70 views

Did migratory birds' ancestors live in the places of migration?

I was studying birds' migration as a type of instinctive behaviour. But my textbook points out that other than for warm climate and easy food, migratory bird migrate to places where their ancestors ...
22
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1answer
4k views

How did the felines get to America?

I don't know if the felines got originated on America or on Africa, but I do know there are species of cat in America and Africa that belong to the same family and genus (Felidae & Panthera). How ...
4
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2answers
272 views

How do migrating birds know where to migrate?

Migrating birds return to the same spot, year after year. These locations are often thousands of kilometers apart. How do the birds know where to fly to? So far I have found that the birds tend to ...
0
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1answer
58 views

Why haven't environmentally-reactive bodies developed as an evolutionary advantage? [duplicate]

Regardless of region, earth's tilt results in yearly seasonal changes, which organisms deal with through processes like migration/hibernation. Both seem like attempts to avoid the extreme fluctuations....
1
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1answer
57 views

Do non-migratory canada geese still exhibit migration behaviors?

I have noticed that many of the geese in my region (NE US) remain overwinter. I also see many of what I guess (but am not sure) may be the same geese flying in migration patterns. One thing that makes ...
1
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1answer
60 views

What are the migratory patterns of Orcas in the Pacific Northwest? Do they pass by Vancouver in the Fall?

What are the migratory patterns of Orcas in the Pacific Northwest? Do the pass by Vancouver in the Fall? I know you can never predict the sightings of a wild creature, but I was wondering what the ...
0
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1answer
79 views

How diverse are species in remote, isolated areas on Earth? [closed]

If we consider land areas that have been largely isolated from each other from a human point of view, but with a similar climate – for example, a part of Europe and a part of Americas with a similar ...
8
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2answers
201 views

How do animals end up in remote areas?

I was thinking specifically about random marshy water holes on farmers fields. It seems that you can visit just about any one of these and you will find frogs if you look hard enough. They usually ...
9
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1answer
2k views

Do butterflies pass over migration patterns to their offspring?

So, earlier, I read online (http://io9.com/butterflies-remember-a-mountain-that-hasnt-existed-for-509321799) that Monarch butterflies veer east during their southward migration to avoid a mountain ...
12
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1answer
180 views

Biostatistics: Pollen dispersal directionality

What Information am I looking for? Think about a tree that is sending pollen all over the place. Because of wind, most pollen grain will go toward one direction. Imagine, we split the 2D area around ...
10
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4answers
543 views

What triggers the migration of robins?

I live in central Massachusetts, and have begun seeing robins, as we generally do in early March. The temperature is well below normal, though, and three feet of snow are covering the still-frozen ...