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How an Insect Converts Time Into Space: Temporal Niches Aid Coexistence via Modifying the Amount of Habitat Available
Runa K Ekrem1, Alexander Jacobsen2, Hanna Kokko1,3
1Department of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland.
Ecology Letters
|May 30, 2025
Summary
Marine midge (Clunio marinus) coexistence is driven by spatial niches, not just timing. Different reproductive timings lead to distinct water levels, segregating larvae by elevation and ensuring species survival.
Area of Science:
- Ecology
- Evolutionary Biology
- Marine Biology
Background:
- Temporal niche partitioning is a known mechanism for species coexistence.
- The marine midge Clunio marinus exhibits sympatric strains with distinct lunar emergence times (full moon and new moon).
Purpose of the Study:
- To investigate the role of temporal niches in promoting coexistence in Clunio marinus.
- To determine if timing differences in reproduction lead to spatial segregation and facilitate coexistence.
Main Methods:
- Field data collection on Clunio marinus in Roscoff, France.
- Ecological modeling of population dynamics based on temporal and spatial niche differences.
Main Results:
- Clunio marinus exhibits two strains: a full moon (FM) strain and a new moon (NM) strain.
- NM strain individuals reproduce and lay eggs at higher water levels compared to the FM strain.
- This difference in egg-laying water levels results in partial larval segregation based on elevation.
Conclusions:
- Causality from temporal to spatial niches is critical for coexistence.
- Differences in timing traits can lead to spatial niche differentiation, promoting coexistence.
- Coexistence in Clunio marinus is primarily a result of resulting spatial niche differences, not solely temporal partitioning.
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