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Linking Phylogeny and Morphology to Resource Assimilation Within Aquatic Assemblages.
Matthew B Lodato1, Brian C van Ee1, Carla L Atkinson1
1Department of Biological Sciences University of Alabama Tuscaloosa Alabama USA.
Ecology and Evolution
|November 26, 2024
Summary
Phylogeny and gill morphology shape freshwater mussel diets, influencing species coexistence. Greater evolutionary distance and specific gill structures correlate with distinct feeding niches, revealing key coexistence mechanisms.
Area of Science:
- Ecology
- Evolutionary Biology
- Aquatic Biology
Background:
- Niche partitioning is crucial for species coexistence, but its drivers in closely related aquatic species with similar feeding modes are not fully understood.
- Freshwater mussels (Unionidae) are filter feeders whose particle size selection is influenced by gill morphology, making them ideal for studying niche partitioning.
- Gill latero-frontal cirri density (CD) and cilia per cirrus (CC) are key traits affecting ingestion patterns.
Purpose of the Study:
- To investigate how phylogeny and gill morphology influence the trophic niches and coexistence of freshwater mussels.
- To determine if co-occurring mussel species partition food resources and how phylogenetic distance affects trophic dissimilarity.
- To assess the relationship between gill morphology (CD and CC) and trophic niche area.
Main Methods:
- Stable isotope signatures (δ13C and δ15N) were used to analyze trophic assimilation and niche area in a mussel assemblage.
- Scanning electron microscopy was employed to examine gill morphology, specifically CD and CC.
- Phylogenetic analysis was conducted to determine evolutionary distances among species.
Main Results:
- Species identity and site influenced gill morphology and stable isotope signatures, but only species identity affected trophic niche area.
- Low niche area overlap (0.04–0.18) was observed between co-occurring mussel species, indicating resource partitioning.
- Trophic dissimilarity increased with phylogenetic distance, and higher CD was associated with a narrower trophic niche area.
Conclusions:
- Gill morphology and evolutionary history are significant factors regulating the trophic niches of freshwater mussels.
- Intraspecific variation in gill morphology suggests potential phenotypic plasticity in response to local resources or other particle selection mechanisms.
- Understanding the interplay of trophic niche, phylogeny, and morphology is vital for comprehending mechanisms of species coexistence in functionally similar aquatic organisms.
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