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Questions tagged [biogeography]

Study of the distribution of species & ecosystems in geographic space & through (geological) time

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1answer
10 views

Range map atlas for insects?

I often use BONAP's North American Plant Atlas, for researching plant taxa ranges. BONAP maintains relatively complete phytogeographic and related botanical databases for all free-living vascular ...
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0answers
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What is the thickness of the biosphere?

In other words, what is the vertical distance between the deepest and highest point on Earth where life is found? Life has been discovered at the bottom of the Mariana Trench, 13 km below sea level. ...
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15 views

Gene flow analysis with a single mitochondrial marker

I am currently studying a mud snail genus called Ecrobia. Several species of this genus occur in both the Mediterranean and Black seas. Therefore, I would like to investigate whether there is: ...
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1answer
35 views

Addax in the Land of Israel

The Addax (Addax nasomaculatus) is critically endangered species of a desert anetelope with impressive long horns. Today there are small populations in the Sahara desert and the Arabian desert (Saudi ...
2
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1answer
36 views

What kinds of animals does insular dwarfism affect and how large does an island need to be to escape it?

3 down vote favorite 1 I've been wondering about insular dwarfism, and would like to know if it only affects certain animals (Since some animals grow larger upon colonizing an island, often due to the ...
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0answers
26 views

Lystrosaurus was the largest creature on land in the early Triassic, why did they need burrows?

Lystrosaurus was the largest creature on land in the early Triassic, why did they need burrows? What were they hiding from? (less seriously, why were they so ugly?)
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0answers
22 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 ...
8
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2answers
203 views

Earth's history: The Great Oxidation Event and the 'Boring Billion'

From what I understand the 'Great Oxidation Event' occurred around 2.4 billion - 2.3 billion years ago, when cyanobacteria flooded Earth’s atmosphere with oxygen. The 'boring billion' period was ...
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1answer
182 views

Which Geologic time scale is the most accurate? [closed]

I kindly ask to show me some pictures that is a generally accurate geologic time scale. In google, a lot of geo time scales are different. On what i have searched there are 2 major eons which are ...
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1answer
71 views

How do similar environments on islands in close proximity result in allopatric speciation?

I would like to ask a question on the very classic example of allopatric speciation seen in the Galapagos finches. Adaptive radiation occurred because the finches flew from island to island, so there ...
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0answers
118 views

The mechanism of the evolutionary rate hypothesis

There are several hypotheses for explaining the latitudinal gradients in species diversity (link). Of which, the evolutionary rate hypothesis states that warm temperature increases the rate of ...
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2answers
1k views

What is meant by topographic barrier?

There are three types of barriers, physical , climatic and biological barriers that can prevent the dispersal of organisms. Topographic barrier falls in the category of physical barrier but exactly ...
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1answer
27k views

What is this white stuff inside apples?

I live at Vancouver, BC, Canada and I often find this kind of white stuff inside the apples I buy I used to live in Europe (Switzerland) and never saw that before. It very much look like a fungus. Is ...
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2answers
4k views

How does Australia fit into 'New World' / 'Old World' dichotomy?

How are places such as Australia and New Zealand classified when differentiating geographic areas based on 'New World' and 'Old World?' My understanding is: New World = North America + South America ...