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Related Concept Videos

Competition02:34

Competition

When organisms require the same limited resources within an environment, they may have to compete for them. Competition is a net-negative interaction. Even if two competing individuals or populations do not interact directly, the overall fitness of both competitors is lowered as a result of not having full access to the limited resource.Intraspecific competition, which occurs between individuals of the same species, serves as a natural mechanism for regulating population size. Too much...
Energy Budgets and Reproductive Strategies00:51

Energy Budgets and Reproductive Strategies

Organisms must balance energy intake with the energy required for growth, maintenance, and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species reproduce only once in their lifetime, often investing most available resources into that single reproductive event. Iteroparous species, by contrast, reproduce multiple times over their lifetimes, typically allocating fewer resources to any single...
Parental Care00:55

Parental Care

Many animals exhibit parental care behavior, including feeding, grooming, and protecting young offspring. Parental care is universal in mammals and birds, which often have young that are born relatively helpless. Several species of insects and fish, as well as some amphibians, also care for their young.
Predator-Prey Interactions02:39

Predator-Prey Interactions

Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.Although predation is commonly associated with carnivory, for...
Microbial Interactions: Competition01:26

Microbial Interactions: Competition

Microbial competition is an ecological interaction in which microorganisms vie for limited resources within shared environments. These resources may include nutrients, space, or light, depending on the system. The intensity and outcome of competition are influenced by the environmental context, such as nutrient availability, spatial constraints, and the diversity of microbial species present. These competitive interactions significantly influence the structure, function, and resilience of...
Population Growth00:57

Population Growth

Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.However, realistic environmental conditions limit the number of...

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Related Experiment Video

Updated: Jun 24, 2026

Assessing Differences in Sperm Competitive Ability in Drosophila
09:34

Assessing Differences in Sperm Competitive Ability in Drosophila

Published on: August 22, 2013

Does interspecific competition affect offspring provisioning?

Dustin J Marshall1, Michael J Keough

  • 1School of Integrative Biology, The University of Queensland, Brisbane, Queensland 4072, Australia. d.marshall1@uq.edu.au

Ecology
|March 28, 2009
PubMed
Summary
This summary is machine-generated.

Mothers experiencing interspecific competition produced larger offspring, increasing dispersal. Offspring size plasticity is influenced by maternal strategy, not just post-metamorphic factors.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Marine Biology

Background:

  • Offspring size is a key life-history trait, but its relationship with performance and environmental influences is understudied in field conditions.
  • Offspring size plasticity is observed in many species, yet its link to performance variations in the field remains unclear.
  • The impact of interspecific competition on selection pressures for offspring size is poorly understood.

Purpose of the Study:

  • To investigate the effect of interspecific competition on the relationship between offspring size and performance in the marine bryozoan Watersipora subtorquata.
  • To determine if environmental factors, specifically interspecific competition, influence offspring size plasticity and subsequent performance in a natural setting.

Main Methods:

  • Field study of Watersipora subtorquata along the south coast of Australia.
  • Analysis of the independent and interactive effects of interspecific competition and offspring size on post-metamorphic performance.
  • Quantification of offspring size variation in relation to maternal exposure to interspecific competition.

Main Results:

  • Both interspecific competition and offspring size significantly impacted offspring performance, but their effects were independent.
  • Interspecific competition did not alter the offspring size-performance relationship.
  • Mothers experiencing interspecific competition produced larger offspring compared to those without competition.

Conclusions:

  • Increased offspring size in Watersipora subtorquata may be a maternal strategy to enhance offspring dispersal under competitive conditions.
  • Offspring size is plastic and influenced by maternal experience of competition, suggesting a strategic maternal effect.
  • Post-metamorphic factors alone do not solely determine maternal production of offspring of a certain size.