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Related Concept Videos

Competition02:34

Competition

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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.
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Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.
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Biodiversity describes the variety of living things at multiple organizational levels: genetic, species and ecosystem diversity. Species diversity includes all branches of the evolutionary tree from single-celled prokaryotic organisms, bacteria, and archaea, to the eukaryotic kingdoms: plants; animals; fungi; and protists. To date, there have been about 1.75 million species identified, and new species are discovered every week.
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Ecological Niches02:02

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All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.
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Keystone Species01:39

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Measures of species biodiversity, such as richness (i.e., the number of species present) and evenness (i.e., their relative abundance), describe an ecological community’s structure. Many factors affect community structure, including abiotic factors (e.g., sunlight and nutrients), disturbances (e.g., fire or flood), species interactions (e.g., predation or competition), and chance events (e.g., foreign species invasion). Certain species—such as keystone species—also play a...
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Updated: Sep 28, 2025

Physiological Characterization of the Coral Holobiont Using a New Micro-Respirometry Tool
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Biological trade-offs underpin coral reef ecosystem functioning.

Nina M D Schiettekatte1,2,3, Simon J Brandl4, Jordan M Casey4

  • 1PSL Université Paris: EPHE-UPVD-CNRS, USR 3278 CRIOBE, Université de Perpignan, Perpignan, France. nina.schiettekatte@gmail.com.

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Summary

Coral reef fish communities provide vital ecosystem functions, but no single community can maximize all functions. Conservation must consider diverse species and local conditions, not just fish biomass.

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Area of Science:

  • Marine Biology
  • Ecosystem Ecology
  • Conservation Science

Background:

  • Human activities and climate change threaten global ecosystems, particularly coral reefs.
  • Existing research on coral reef functioning often uses oversimplified metrics like fish biomass.
  • Quantitative assessments of multiple, process-based ecosystem functions are lacking, impeding conservation.

Purpose of the Study:

  • To quantitatively assess five key ecosystem functions mediated by coral reef fishes globally.
  • To identify trade-offs between different ecosystem functions within coral reef communities.
  • To understand the role of species diversity and dominance in maintaining ecosystem functions.

Main Methods:

  • Combined global coral reef fish community surveys with bioenergetic models.
  • Quantified five distinct process-based ecosystem functions.
  • Analyzed community structure to identify dominant species and their functional roles.

Main Results:

  • Coral reef fish communities exhibit critical trade-offs between ecosystem functions; no community can optimize all.
  • Ecosystem functions are locally dominated by a few species, but dominant species vary globally.
  • Half of the studied species were functionally dominant in at least one location, highlighting functional redundancy and specialization.

Conclusions:

  • Effective coral reef conservation requires a nuanced, locally tailored approach.
  • Conservation strategies should move beyond simple biomass assessments to consider multiple, process-based functions.
  • Recognizing the diverse functional roles of species is crucial for preserving ecosystem services.