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Trait-similarity and trait-hierarchy jointly determine fine-scale spatial associations of resident and invasive ant species
<p>Interspecific competition, a dominant process structuring ecological communities, is influenced by species' phenotypic differences. Limiting similarity theory holds that species with similar traits should compete intensely ("trait-similarity"). In contrast, competing theories including modern coexistence theory emphasize that species with traits conferring competitive advantages should outcompete others ("trait-hierarchy"). Either or both of these mechanisms may drive competitive exclusion, but their relative importance and interacting effects are rarely studied. Here, we explore empirically whether trait-similarity and trait-hierarchy can explain fine-scale spatial associations observed between invasive and native ant species in a tropical assemblage. We find that pairwise co-occurrences between the invasive red imported fire ant Solenopsis invicta and 28 other species across relatively homogenous grasslands can be explained largely by an interaction of trait-similarity and trait-hierarchy in a single morphological trait, relative pronotum width. Specifically, higher trait-hierarchy values are associated with negative co-occurrences; however, these effects are counteracted when species are increasingly dissimilar in their trait ranges. These findings are consistent with the notion that limiting similarity and competitive hierarchies are interactive rather than discrete mechanisms driving competitive exclusion.</p>
Supplementary material 1 from: Lach L, Hoffmann BD, Moir ML (2020) Native and non-native sources of carbohydrate correlate with abundance of an invasive ant. NeoBiota 63: 155-175. https://doi.org/10.3897/neobiota.63.57925
Tables S1–S6
Data from: Inbreeding tolerance as a pre-adapted trait for invasion success in the invasive ant Brachyponera chinensis
Identifying traits that facilitate species introductions and successful invasions of ecosystems represents a key issue in ecology. Following their establishment into new environments, many non-native species exhibit phenotypic plasticity with post-introduction changes in behavior, morphology or life history traits that allow them to overcome the presumed loss of genetic diversity resulting in inbreeding and reduced adaptive potential. Here we present a unique strategy in the invasive ant Brachyponera chinensis (Emery), in which inbreeding tolerance is a pre-adapted trait for invasion success, allowing this ant to cope with genetic depletion following a genetic bottleneck. We report for the first time that inbreeding is not a consequence of the founder effect following introduction, but it is due to mating between sister queens and their brothers that pre-exists in native populations which may have helped it circumvent the cost of invasion. We show that a genetic bottleneck does not affect the genetic diversity or the level of heterozygosity within colonies and suggest that generations of sibmating in native populations may have reduced inbreeding depression through purifying selection of deleterious alleles. This work highlights how a unique life history may pre-adapt some species for biological invasions.
Data from: Androgenesis is a maternal trait in the invasive ant Wasmannia auropunctata
Androgenesis is the production of an offspring containing exclusively the nuclear genome of the fathering male, via the maternal eggs. This unusual mating system is generally considered as a male trait, giving to androgenetic males a substantial fitness advantage over their sexually reproducing relatives. We here provide the first empirical study of the evolutionary outcomes of androgenesis in a haplo-diploid organism: the invasive ant Wasmannia auropunctata. Some of the populations of this species have a classical haplo-diploid sexual mating system. In other populations, females and males are produced through parthenogenesis and androgenesis, respectively, whereas workers are produced sexually. We conducted laboratory reciprocal-cross experiments with reproductive individuals from both types of populations and analyzed their progenies with genetic markers, to determine the respective contribution of males and females on the production of androgenetic males. We found that androgenesis was a parthenogenetic female trait. A population genetic study conducted in natura confirmed the parthenogenetic female origin of androgenesis, with the identification of introgression events of sexual male genotypes into androgenetic/parthenogenetic lineages. We argue that by producing males via androgenesis, parthenogenetic queen lineages may increase and/or maintain their adaptive potential, whilst maintaining the integrity of their own genome, by occasionally acquiring new male genetic material and avoiding inbreeding depression within the sexually produced worker cast.
Supplementary material 1 from: Wetterer JK (2017) Invasive ants of Bermuda revisited. Journal of Hymenoptera Research 54: 33-41. https://doi.org/10.3897/jhr.54.11444
Specimen collection information : Explanation note: Self-explanatory
Supplementary material 1 from: Helms IV JA, Bridge ES (2017) Range expansion drives the evolution of alternate reproductive strategies in invasive fire ants. NeoBiota 33: 67-82. https://doi.org/10.3897/neobiota.33.10300
Range expansion drives the evolution of alternate reproductive strategies in invasive fire ants :
Figure 3 from: López-Collar D, Cabrero-Sañudo FJ (2021) Update on the invasion status of the Argentine ant, Linepithema humile (Mayr, 1868), in Madrid, a large city in the interior of the Iberian Peninsula. Journal of Hymenoptera Research 85: 161-177. https://doi.org/10.3897/jhr.85.65725
Figure 3 Colony extension and foraging areas of the Argentine ant in nine locations of Madrid. A Enrique Tierno Galván Park B del Norte-Carmen Tagle Park C Real Jardín Botánico de Madrid and Alfonso XII Street D Príncipe de Vergara Street E Sorolla Museum Gardens F Nueva España Neighbourhood G Casa de Campo Park (east side) and Madrid Río Park.
Figure 2 from: López-Collar D, Cabrero-Sañudo FJ (2021) Update on the invasion status of the Argentine ant, Linepithema humile (Mayr, 1868), in Madrid, a large city in the interior of the Iberian Peninsula. Journal of Hymenoptera Research 85: 161-177. https://doi.org/10.3897/jhr.85.65725
Figure 2 Locations of the Argentine ant in the city of Madrid. The letters in red circles correspond to locations where the Argentine ant has been recorded during the 2018–2020 surveys (areas in red). Letters in blue circles indicate bibliographic and personal communication records. The green areas correspond to parks and gardens that have been thoroughly sampled and where Linepithema humile has not been found, except for the eastern corner of the Casa de Campo Park (E). The light grey areas are green areas (parks and gardens) that have not been sampled and are capable of harbouring colonies of the Argentine ant.
Figure 1 from: López-Collar D, Cabrero-Sañudo FJ (2021) Update on the invasion status of the Argentine ant, Linepithema humile (Mayr, 1868), in Madrid, a large city in the interior of the Iberian Peninsula. Journal of Hymenoptera Research 85: 161-177. https://doi.org/10.3897/jhr.85.65725
Figure 1 Municipalities (in red) where the Argentine ant has been recorded in the Community of Madrid.
Figure 4 from: López-Collar D, Cabrero-Sañudo FJ (2021) Update on the invasion status of the Argentine ant, Linepithema humile (Mayr, 1868), in Madrid, a large city in the interior of the Iberian Peninsula. Journal of Hymenoptera Research 85: 161-177. https://doi.org/10.3897/jhr.85.65725
Figure 4 Argentine ant workers photographed in the city of Madrid. Both photographs belong to the citizen science platform 'Biodiversidad Virtual'. A Real Jardín Botánico of Madrid, by José Fernández (Biodiversidad Virtual 2016). B Puerto Rico Street, Nueva España Neighbourhood, by Álvaro Izuzquiza (Biodiversidad Virtual 2011).
Supplementary material 2 from: Sanmartín-Villar I, Cruz da Silva E, Chiara V, Cordero-Rivera A, Lorenzo-Carballa MO (2022) Genetic divergence and aggressiveness within a supercolony of the invasive ant Linepithema humile. NeoBiota 77: 125-153. https://doi.org/10.3897/neobiota.77.90852
Behavioural data
Supplementary material 1 from: Sanmartín-Villar I, Cruz da Silva E, Chiara V, Cordero-Rivera A, Lorenzo-Carballa MO (2022) Genetic divergence and aggressiveness within a supercolony of the invasive ant Linepithema humile. NeoBiota 77: 125-153. https://doi.org/10.3897/neobiota.77.90852
Figures S1–S4, Tables S1, S2
Trait-similarity and trait-hierarchy jointly determine fine-scale spatial associations of resident and invasive ant species
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Data from: Androgenesis is a maternal trait in the invasive ant Wasmannia auropunctata
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Data from: Inbreeding tolerance as a pre-adapted trait for invasion success in the invasive ant Brachyponera chinensis
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The Cryptic impacts of invasion: functional homogenization of tropical ant communities by invasive fire ants
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Managing island-invasive ants: invertebrate predation, targeted suppression and subsequent endemic insect recovery
<p>These two datasets accompany the manuscript of the same title.</p>
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