Zoolog-INTRO-PPT_123224

Basic Principles of Zoology

  • Zoology is the study of animals, encompassing a vast array of species and complex biological processes.

Diversity in Zoology

  • Over 20,000 described species of bony fishes.

  • More than 300,000 described species of beetles, with many more currently undescribed.

Subdisciplines of Zoology

  • Anatomy: Structure of organisms and their parts.

  • Cytology: Structure and function of cells.

  • Ecology: Interaction of organisms with their environment.

  • Embryology: Development from fertilization to birth or hatching.

  • Genetics: Mechanisms of trait transmission.

  • Histology: Study of tissues.

  • Molecular Biology: Subcellular structure and function.

  • Parasitology: Study of organisms that live on or in others at the host's expense.

  • Physiology: Function of organisms and their parts.

  • Systematics: Classification and evolutionary relationships among animal groups.

Specializations by Taxonomic Categories

  • Entomology: Study of insects.

  • Herpetology: Study of reptiles and amphibians.

  • Marine Zoology: Study of marine life.

  • Animal Behavior: Study of how animals behave.

  • Wildlife Biology: Study of wildlife.

  • Ethology: Study of animal behavior.

  • Invertebrate and Vertebrate Zoology: Study of invertebrates and vertebrates.

  • Mammalogy: Study of mammals, including branches like primatology and cetology.

Evolutionary Perspective in Zoology

  • Organic evolution refers to changes in populations over time, influencing animal diversity and relationships.

  • Charles Darwin's work in 1859 provided evidence and mechanisms for evolutionary change.

Taxonomic Classification

  • Animals are classified in a hierarchical structure:

    • Domain > Kingdom > Phylum > Class > Order > Family > Genus > Species

  • Example:

    • Eukarya - Animalia - Muscidae - Musca domestica (house fly)

    • Arthropoda - Hexapoda - Diptera - Tabanidae - Tabanus opacus (horse fly)

    • Chordata - Mammalia - Primates - Hominidae - Homo sapiens (humans).

Binomial Nomenclature

  • Developed by Karl von Linne; a systematic way to name species using two names (genus and species).

Ecological Perspective in Zoology

  • Ecology studies relationships between organisms and their environment, emphasizing the importance of understanding these dynamics.

  • Historical human dependence on animals has often led to their exploitation.

Importance of Ecology

  • Understanding ecological principles can help prevent environmental disasters.

  • Key concepts include the cycling of matter, population growth, and energy usage in ecosystems.