Competition

Definition

Competition is an ecological interaction where organisms vie for limited resources such as food, space, or mates. This struggle occurs between individuals of the same species (intraspecific competition) or between different species (interspecific competition), influencing population dynamics and growth limits. Competition can significantly affect the health and sustainability of populations, shaping community structures and ecosystem functions.

5 Must Know Facts For Your Next Test

1. Competition can limit population growth by reducing the number of individuals that can survive and reproduce, particularly when resources are scarce.
2. Species that compete for the same resources may undergo character displacement, where they evolve differences to minimize overlap and reduce competition.
3. The competitive exclusion principle states that two species competing for the same resource cannot coexist indefinitely; one will outcompete the other.
4. Competition not only influences individual fitness but also shapes community interactions and biodiversity within ecosystems.
5. Resource availability can fluctuate due to environmental changes, which can intensify competition among populations, affecting their distribution and survival.

Review Questions

• How does competition influence population growth and community structure?
  • Competition impacts population growth by limiting access to essential resources, which can reduce birth rates and increase mortality rates. As organisms compete for food, space, and mates, those with advantageous traits may thrive while others struggle. This dynamic not only affects individual species but also shapes the overall community structure by influencing species diversity and interactions within the ecosystem.
• Discuss the implications of intraspecific versus interspecific competition on species survival.
  • Intraspecific competition can lead to a stronger selection pressure within a species, as individuals fight for the same resources. This can drive adaptations and affect population dynamics significantly. In contrast, interspecific competition introduces complexities such as niche differentiation or competitive exclusion, impacting how species coexist and survive. The outcome of these interactions is crucial for understanding community stability and biodiversity.
• Evaluate the long-term effects of sustained competition on ecological communities and species evolution.
  • Sustained competition can lead to significant ecological consequences, including changes in community composition, resource partitioning, and even extinction events. Over time, this pressure can drive evolutionary adaptations in competing species, resulting in specialization or new niche formations. These processes contribute to biodiversity and ecological resilience, highlighting the intricate balance within ecosystems shaped by competitive interactions.

Related terms

Intraspecific Competition: Competition that occurs among individuals of the same species for the same resources.

Interspecific Competition: Competition that takes place between individuals of different species competing for similar resources.

Carrying Capacity:

The maximum number of individuals of a particular species that an environment can sustain over time without degrading the habitat.