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Species-area and network-area relationships in host-helminth interactions
1Department of Biological Science, Louisiana State University, Baton Rouge, LA, USA.
Proceedings. Biological Sciences
|March 24, 2021
Summary
Geographical area influences species richness and interactions in host-helminth networks. However, observed patterns in species-area relationships (SAR) and network modularity deviate from macroecological theory, suggesting refinements are needed.
Area of Science:
- Macroecology
- Ecological Network Analysis
- Parasitology
Background:
- The species-area relationship (SAR) describes how species richness increases with sampled area.
- Network-area relationships (NARs) extend SAR to ecological networks, predicting area influences interaction structures.
- Host-helminth parasite interactions offer a model system to test NARs.
Purpose of the Study:
- To test macroecological theory on network-area relationships (NARs) using a global host-helminth dataset.
- To investigate how geographical area impacts species richness and interaction diversity in host-helminth networks.
- To evaluate theoretical predictions regarding species-area slopes and network modularity with increasing area.
Main Methods:
- Compiled a global dataset of host-helminth parasite interactions.
- Sequentially scaled up local networks to a global host-helminth network.
- Analyzed changes in species richness, interaction number, and network modularity with increasing geographical area.
Main Results:
- Geographical area was found to influence species richness and the number of interactions in host-helminth networks.
- Species-area slopes were steeper for host species than for their helminth parasites, contradicting theoretical predictions.
- Network modularity decreased with increasing geographical area, also contrary to theoretical expectations.
Conclusions:
- Existing macroecological theory needs refinement to account for observed network-area relationships (NARs).
- Discrepancies highlight the importance of network type, species overlap, and interaction specificity in shaping NARs.
- Further research is needed to reconcile theoretical predictions with empirical findings on the spatial structuring of ecological networks.
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