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8 godz. temu · In the field of biology, emigration refers to the movement of individuals or populations from their natural habitat or environment to another, often in search of better living conditions, resources, or new opportunities. Emigration is a fundamental concept in ecology, population biology, and conservation biology, and is a critical aspect of understanding how species adapt, evolve, and thrive ...
14 paź 2019 · This document provides a brief history of important figures in biology. It begins with Aristotle, considered the father of biology, who pioneered the classification of living things. It then discusses Hippocrates, the father of medicine, and Claudius Galen who made early studies of human anatomy.
Emigration is the process of leaving one country or region to settle in another. It plays a significant role in shaping population dynamics, influencing genetic diversity, and affecting the overall gene pool of populations.
Gene flow — also called migration — is any movement of individuals, and/or the genetic material they carry, from one population to another. Gene flow includes lots of different kinds of events, such as pollen being blown to a new destination or people moving to new cities or countries.
This chapter defines migration as a function of its physiological and behavioral characteristics and how natural selection acts on these. Migration is then described in terms of its ecological outcomes. The pioneering studies of J. S. Kennedy on migratory aphids are discussed, showing how migration can be experimentally characterized.
Download a ready-to-use PowerPoint presentation that explains the causes and effects of human migration. Descriptions and full explanations, along with historical examples, can be found in the notes pages.
Return movements were established early on by vertebrate biologists as the criterion for “true migration” (Thomson 1926; Heape 1931). Thomson described such “true” migrations as “changes of habitat, periodically recurring and alternating in direction, which tend to secure optimal environmental conditions at all times” (1926, p. 3).
