RSS Blog Feed

Life History Strategies

An organism’s life history is the pattern of growth, development, and reproduction over the course of its life. Since fitness is a measure of the organism’s reproductive success, we know that natural selection will favour the life history strategy that results in the greatest number of offspring that survive to produce offspring of their own. … Continue reading Life History Strategies

Where Do New Species Come From?

A fundamental question in ecology is the question of how the vast diversity of species that we find on this planet originate.   Key to this is the idea of reproductive isolation, or the group of mechanisms which prevent two groups of living organisms from breeding with each other. Reproductive isolation can be subdivided into … Continue reading Where Do New Species Come From?

What is a Species?

The task of classification of organisms has remained a daunting task ever since we humans began to group what we consider to be closely related living beings together.   In the mid 1700s, Swedish botanist, zoologist, and physician Carolus Linnaeus wrote the System Naturae, a way of organizing living beings into a hierarchical fashion. Combined … Continue reading What is a Species?

The History of Evolution and Natural Selection

Within much of western science prior to the 6th century BC, creation myths pervaded much of the answers to the creation of the universe and the species within it. Aristotle had proposed a taxonomy of nature. Amongst the Ancient Greeks, Empedocles had proposed an early form of spontaneous generation, where individuals were assembled from parts … Continue reading The History of Evolution and Natural Selection

Natural Selection and Adaptation

Natural selection is the key mechanism through with evolutionary change occurs and has led to the near infinite modifications that we see in the biological diversity of the world today. In order for natural selection to occur, three conditions must be met. First, there must be variation – individuals differing from each other – within … Continue reading Natural Selection and Adaptation