TY  - JOUR
A1  - Sprenger, Philipp P.
A1  - Müsse, Christian
A1  - Hartke, Juliane
A1  - Feldmeyer, Barbara
A1  - Schmitt, Thomas
A1  - Gebauer, Gerhard
A1  - Menzel, Florian
T1  - Dinner with the roommates: trophic niche differentiation and competition in a mutualistic ant‐ant association
JF  - Ecological Entomology
N2  - 1. The potential for competition is highest among species in close association. Despite net benefits for both parties, mutualisms can involve costs, including food competition. This might be true for the two neotropical ants Camponotus femoratus and Crematogaster levior, which share the same nest in a presumably mutualistic association (parabiosis).
2. While each nest involves one Crematogaster and one Camponotus partner, both taxa were recently found to comprise two cryptic species that show no partner preferences and seem ecologically similar. Since these cryptic species often occur in close sympatry, they might need to partition their niches to avoid competitive exclusion.
3. Here, we investigated first, is there interference competition between parabiotic Camponotus and Crematogaster, and do they prefer different food sources under competition? And second, is there trophic niche partitioning between the cryptic species of either genus?
4. Using cafeteria experiments, neutral lipid fatty acid and stable isotope analyses, we found evidence for interference competition, but also trophic niche partitioning between Camponotus and Crematogaster. Both preferred protein‐ and carbohydrate‐rich baits, but at protein‐rich baits Ca. femoratus displaced Cr. levior over time, suggesting a potential discovery‐dominance trade‐off between parabiotic partners. Only limited evidence was found for trophic differentiation between the cryptic species of each genus.
5. Although we cannot exclude differentiation in other niche dimensions, we argue that neutral dynamics might mediate the coexistence of cryptic species. This model system is highly suitable for further studies of the maintenance of species diversity and the role of mutualisms in promoting species coexistence.
KW  - Cryptic species
KW  - Formicidae
KW  - neutral theory
KW  - niche partitioning
KW  - nutrition
KW  - parabiosis
KW  - species coexistence mechanism
KW  - trade‐offs
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-228215
VL  - 46
IS  - 3
SP  - 562
EP  - 572
ER  -