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Links between deep-sea respiration and community dynamics
Ecology
|July 22, 2014
Summary
Abyssal echinoderm communities show inverse links between population density and individual metabolic rates. Respiration varied interannually, influenced by species composition and climate-driven food supply.
Area of Science:
- Marine ecology
- Deep-sea ecosystems
- Biogeochemical cycles
Background:
- Understanding ecosystem functioning requires linking community dynamics to environmental variability.
- Compensatory dynamics, or 'zero-sum' dynamics, propose an inverse relationship between population density and individual metabolic rate.
- Nonuniform body size distributions suggest limitations in solely using metabolism to explain community structure.
Purpose of the Study:
- To investigate the mechanisms linking abyssal ecosystem functioning to environmental and resource variation.
- To examine class- and mass-specific respiration rates of abyssal echinoderms in relation to community structure and resource supply.
- To analyze interannual variations in abyssal community composition and structure.
Main Methods:
- Analysis of long-term (since 1989) density and biomass data for dominant abyssal megafauna (echinoderms).
- Measurement of class- and mass-specific individual respiration rates.
- Correlation of faunal data with resource supply (particulate organic carbon fluxes) and climate variation.
Main Results:
- Inverse relationships between echinoderm density and mean individual metabolic rate were observed at both study sites (northeast Pacific and northeast Atlantic).
- Fourfold interannual variations in echinoderm respiration were detected, linked to shifts in species composition and structure.
- In the northeast Pacific, mobile surface deposit-feeding echinoderm respiration positively correlated with climate-driven particulate organic carbon fluxes (1-year lag).
Conclusions:
- Abyssal echinoderm communities exhibit compensatory dynamics, with density inversely related to individual metabolic rate.
- Interannual respiration variability is driven by changes in species composition and influenced by climate-linked food availability.
- These findings highlight the role of metabolic scaling and resource availability in structuring deep-sea communities.
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