Principles of Ecology: Fundamentals, Organization, and Biodiversity

This flashcard set covers the foundational concepts of ecology, including levels of organization, Earth's layers, energy flow, trophic structures, and the components of biodiversity and ecological niches.

Ecology

A multidisciplinary discipline that integrates knowledge from biology, physics, chemistry, geology, social sciences, and economics to understand the balance of the planet and human impact on ecosystems.

Species

The unit of study in ecology, consisting of a set of individuals capable of reproducing with each other and having fertile offspring.

Population

A group of individuals of the same species living in a specific geographical area at the same time.

Community (Biota or Biocenosis)

A set of populations of different species that inhabit the same region at the same time.

Biotic Factors

The living organisms or components within a community.

Abiotic Factors

The non-living physicochemical factors that constitute the environment.

Biotope

The specific environmental region where a community lives.

Ecosystem

A stable system formed by the interaction between biotic and abiotic factors, applicable at any scale from a pond to the entire Earth.

Lithosphere

The outer layer of the Earth consisting of rocks and stones.

Hydrosphere

The layer of the Earth formed by all bodies of water.

Atmosphere

The layer of the Earth integrated by air.

Biosphere

The layer formed by organisms and their environment where all life develops and interacts with the physical medium.

Food Chain

A linear representation of energy flow where each link represents a trophic level, from producers to final consumers.

Food Web

A model showing all feeding relationships in an ecosystem, providing a precise view of energy and nutrient flow as organisms often feed on multiple sources.

Energy Flow

An open, unidirectional process where solar radiation is captured by producers and transformed into chemical energy, losing a portion as heat at each transfer.

$$10\% \text{ Rule}$$

The principle stating that the amount of energy available to a trophic level is only a fraction, approximately $\frac{1}{10}$, of the energy from the previous level.

Biodiversity

The complex network that sustains life, comprising the variability of organisms, including diversity within species, between species, and between ecosystems.

Genetic Diversity

The number of genetic characteristics and variations existing in the genes of individuals of the same species, allowing for adaptation and survival.

Species Diversity

The variety of species on the planet, measured by species richness (number of species) and relative abundance (number of individuals of each species).

Ecosystem Diversity

The variety of communities of organisms within a specific habitat and their interactions with the physical environment.

Producers (Autotrophs)

Organisms in the first trophic level that synthesize organic matter from inorganic substances using light or chemical energy.

Primary Consumers

Herbivorous organisms at the second trophic level that feed directly on producers.

Secondary Consumers

Carnivorous organisms at the third trophic level that feed on primary consumers or herbivores.

Tertiary Consumers

Carnivorous animals at the fourth trophic level that feed on other carnivores.

Decomposers

Organisms that break down organic matter into chemical elements to be reused, including detritivores and scavengers.

Habitat

The environment in which a specific species or community lives, characterized by its physical and biotic properties.

Ecological Niche

The specific function, position, or role that an organism plays within a community or ecosystem.

Potential Niche

The maximum distribution a species can have, limited only by its behavior and physiological characteristics.

Realized Niche

The actual area a species occupies based on its interactions with other organisms and the availability of resources.

Niche Breadth (Amplitude)

The multi-dimensional size and shape of a niche, which varies for each species based on resource use and displacement.

Specialist Organisms

Organisms with a very small niche breadth and specific adaptations for a particular habitat.

Generalist Organisms

Organisms with a large niche breadth that can adjust to a wide variety of resources and adapt quickly to environmental changes.