Anthropology and Evolutionary Biology Vocabulary

Definition and Subdisciplines of Anthropology

  • Anthropology:

    • Defined as the study of humans/humankind from the perspective of all the peoples through time, focusing on the biological and cultural evolution of how humans vary and interact.
    • Employs a holistic perspective, considering how all aspects of human existence (past, present, biology, culture, and language) are integrated to comprehend human variation and evolution.

  • Subdisciplines of Anthropology:

    • Sociocultural Anthropology:
      • Examines variations in cultural behaviors among current and past human populations.
      • Culture: Learned behavior transmitted from person to person, encompassing social systems, economic systems, marriage customs, religion, and philosophy.
    • Archaeology:
      • Studies cultural behaviors from the historic and prehistoric past through the systematic analysis of material remains, including sites, features, and artifacts.
      • Archaeologists focus on reconstructing and understanding past human cultures.
    • Linguistic Anthropology:
      • Studies the structure, evolution, and usage of language in human societies and its relationship to culture.
      • Language: A set of written or spoken symbols that refer to things (people, places, concepts) other than themselves.
    • Biological/Physical Anthropology:
      • Examines all aspects of present and past human biology.
      • Investigates the biological evolution of humans and their ancestors, biological variation within and between individuals and human populations, and the relationship of humans to other organisms.
      • Grounded in two fundamental underlying concepts:
        • Everyone is a product of evolutionary history (all biological changes that brought humanity to its present form).
        • Everyone is a product of an individual life history, shaped by genes and a biological make-up influenced by the environment.
    • Applied Anthropology:
      • Recognized alongside the four primary fields as a subdiscipline dedicated to practical application.

  • Six Subfields of Biological Anthropology:

    • Skeletal Biology/Palethology:
      • Studies skeletal biological variation, health, and disease among past human populations.
    • Forensic Anthropology:
      • Focuses on human identification and skeletal biology within a medico-legal context among modern groups.
    • Primatology:
      • The study of non-human primate cousins, including lemurs, monkeys, and apes.
    • Human Biology:
      • Studies biological variation and health in modern, living human groups.
    • Genetics:
      • Studies biological relatedness, human variation at the genetic level, and population movements.
    • Paleonthropology:
      • Concerned with the origins, evolution, and biological development of early humans.

Defining Human Characteristics and the Scientific Method

  • Key Characteristics That Make Us Human:

    • Bipedalism: The biological ability to walk upright on two feet.
    • Non-Homing Canine: Canines that are not sharpened against lower premolars and possess no diastema or space between teeth.
    • Material Culture: Objects created and used by humans to manipulate their environment, serving as tools for survival.
    • Hunting: Organized collective hunting practices.
    • Speech: Symbolic linguistic communication.
    • Domesticated Foods: Systematically cultivated plants and domesticated animals.

  • Biological Anthropology and the Biocultural Approach:

    • Focuses on biological anthropology as an overview of human beings as biological organisms.
    • Examines patterns of biological variation and evolutionary change.
    • Analyzes the impact of culture on human biology, a framework referred to as biocultural.

  • The Scientific Method and Empirical Research:

    • Science:
      • More than a collection of knowledge and facts; it is a dynamic method of acquiring knowledge through systematic observation.
      • Observations form the baseline for identifying problems, formulating questions, and gathering data.
    • Data:
      • Serves as evidence that assists in answering questions, solving problems, and testing hypotheses.
      • Hypotheses are accepted or rejected based directly on the empirical evaluation of data.
    • Science derives generalizations from natural observations and subjects those generalizations to empirical tests.
    • Science is empirical, meaning it is strictly based on observation or experience.
    • Incorporates both inductive and deductive research methods.
    • Step-by-Step Scientific Method Process:
      1. Identify the problem based on prior observations.
      2. State the hypothesis.
      3. Collect relevant data.
      4. Test the hypothesis.

  • Scientific Theories and Epistemology:

    • Theory: The best possible explanation based on current understanding of real-world problems. A hypothesis that survives rigorous, repeated testing becomes a theory.
    • Example of Evolving Theories: Newton's theory of gravity was accepted for a long time until Einstein introduced the theory of relativity.
    • Science is constantly evolving and changing as new and superior observations are made.
    • Example of Taxonomic Re-evaluation: Pluto was historically considered the 9th9\text{th} planet, was later demoted to a dwarf planet following new research, and remains subject to ongoing scientific reassessment.
    • Evolution: A scientific theory defined as biological and cultural change over time, representing a relatively modern conceptual framework.

Pre-Evolutionary Paradigm and Natural Theology

  • The Pre-Evolutionary Worldview:

    • World in Stasis: The belief that the physical universe and natural world are permanent and unchanging.
    • Fixity of Species: The doctrine that species are immutable and undergo no evolutionary change across generations.
    • Great Chains of Being: A rigid hierarchical structure ordering existence: God, angels, heaven, humans, beats, plants, flame, rocks.
    • Complete absence of the concept of deep geological time.

  • Natural Theology:

    • Science and religion existed in close harmony, bound by the notion of divine design.
    • The natural world was interpreted as physical expressions of God's thoughts, making scientific study intertwined with religious devotion.
    • Naturalists investigating nature viewed their work as investigating God's work (Natural Theology).
    • The Great Chain of Being was held to be immutable, ranked, and eternal:
      • Species were considered unchanging with no possibility of extinction.
      • Plenitude: The philosophical belief that everything that can exist does exist.
      • All creatures were viewed as distinct creations by God, representing physical expressions of an ideal form in God's mind.

Historical Development of Evolutionary Thought

  • Nicolaus Copernicus:

    • Authored On the revolutions of the heavenly spheres.
    • Proposed the heliocentric model (sun in the center), replacing the geocentric model (earth in the center).
    • Asserted: "The earth is not the center of all things celestial, but instead is one of several planets circling a sun which is one of many suns in the universe."
    • Dislodged humans from being the geographic center of God's physical creation, though humanity maintained its status as the pinnacle of God's creation.

  • Archbishop James Ussher:

    • Counted the genealogical lineages recorded in the Old Testament to determine the exact date of creation.
    • Calculated that the earth was created "upon the entrance if the night preceding the 2323\text{ day of october}, 4004 BC4004\,\text{BC}."
    • Concluded that the world began precisely in 4004 BC4004\,\text{BC}.

  • John Ray:

    • Established the interbreeding criterion in 16861686.
    • Coined the formal term species.
    • Defined species: If two individual organisms can interbreed and produce fertile offspring, they belong to the same species.

  • Carlos linnaeus:

    • Attempted to document God's creation within an organized system based on the Great Chain of Being.
    • Created the formal system of taxonomy in System Naturae (17361736).
    • Perfected the modern system of binomial nomenclature, assigning two unique names (a genus and a species) to organisms (e.g., Homo sapiens).
    • Utilized a type specimen for diagnostic comparison:
      • Analyzed specimens for unique diagnostic features.
      • Classified a specimen as a new species if it differed from the type specimen.
    • Distinguished species by identifying unique diagnostic features.
    • Originally established 44 taxonomic levels: Class, Order, Genus, species. (Modern taxonomy uses: Kingdom, Phylum, Class, Order, Family, Genus, Species).

  • Gerges-louis Leclerc, comte de buffon:

    • A contemporary of Carlos linnaeus who openly disagreed with Linnaeus's approach.
    • Argued that the whole organism must be studied rather than focusing solely on isolated diagnostic features.
    • Wrestled with anatomical similarities between humans and apes, explicitly suggesting common ancestry.
    • Proposed that the planet was much older than 6000 years6000\,\text{years}.
    • Believed in common descent—that all life descended from a common ancestor—viewing the Great Chain of Being as a continuum rather than an immutable ladder.
    • Proposed organic change, arguing that the environment acted directly on organisms through "organic particles," though he was unable to articulate a functional biological mechanism for this process.
    • Branded a heretic by the church for his evolutionary assertions.

  • The Dodo Bird:

    • A flightless indigenous pigeon that was easy prey and tasted bad.
    • Its complete extinction demonstrated that species extinction was possible, creating major conceptual fissures in the immutable Great Chain of Being.

  • Baron Georges Civier:

    • Recognized as the father of paleontology and was the first scientist to document extinction.
    • An international expert on dinosaurs who rejected the idea that dinosaur fossils implied evolution, maintaining the "fixity" of species.
    • The primary proponent of Catastrophism:
      • Posited that violent and sudden natural catastrophes caused localized mass extinctions in catastrophe zones.
      • Life forms from surrounding areas subsequently moved in to repopulate the region, explaining why the fossil record displays abrupt species changes.
      • Formulated explanations based on empirical scientific evidence rather than biblical interpretation.
      • Used catastrophism to explain observed patterns of extinction and faunal succession in the fossil record through replacement, characterized by long stability interrupted by sudden changes.

  • James Hutton:

    • Recognized as the father of modern geology.
    • Suggested an infinity of geological time, famously stating: "No vestige of a beginning, no prospect of an end."
    • Formulated Uniformitarianism: The theory that the earth is vastly older than previously believed, and that natural geological processes occurring in the present are the exact same processes that operated in the past and will continue in the future.
    • Argued that millions of years were required to shape the earth's features (gradualism), representing a direct rejection of catastrophism.

  • Jean Baptiste de lamarck:

    • French naturalist who proposed that microscopic organisms spontaneously appear from nonliving materials and gradually become complex organisms as they strive for perfection.
    • First individual to propose a comprehensive theory of evolution and adaptation.
    • Formulated the theory of inheritance of acquired characteristics (Lamarckism):
      • An organism alters a body part during its lifetime to adapt to environmental needs, and this modified trait is subsequently inherited by offspring.
      • The environment produces a direct need for biological change.
      • Postulated a dynamic interaction between organisms and their environment, where organisms change in response to challenging environments to survive and reproduce.

  • Thomas Robert Malthus:

    • English demographer and political economist concerned about the severe decline of living conditions in 19th century19\text{th}\,\text{century} England.
    • Attributed population decline to three primary causes:
      1. Overproduction of young.
      2. Inability of resources to keep pace with the rise in human population.
      3. Irresponsibility of the lower class.
    • Authored Essay on the principle of population (17981798):
      • Observed that plants and animals produce far more offspring than can survive, and that humans are equally capable of overproducing if left unchecked.
      • Framed the "struggle for existence" (manifested via famine, war, etc.) as an inescapable consequence of population pressure.
      • Warned that unless family size was regulated, human famine would become globally epidemic.
      • Grounded his concepts in religious beliefs; his ideas directly influenced Charles Darwin's formulation of natural selection.

  • Charles Lyell:

    • British geologist and lawyer who authored Principles of geology, asserting that change is the only constant.
    • Provided extensive geological evidence supporting James Hutton's concept of uniformitarianism.
    • Demonstrated that past geological processes—including erosion, earthquakes, and glacial movements—are identical to processes operating today.
    • Argued for slow, incremental change (gradualism) operating without divine intervention.

  • Charles Darwin:

    • Served on the HMS Beagle expedition.
    • Observed that the physical characteristics of finches and other organisms were adaptations (specific characteristics that increase an organism's ability to survive and reproduce) matched to their specific diet and environment.
    • Identified adaptation as the crux of evolution.
    • Formulated the Theory of Natural Selection: The process by which features that enable organisms to adapt to an environment allow them to preferentially survive and reproduce, thereby increasing the frequency of those advantageous features in the population.