Data

Data for: Tolerance of intraspecific competition contributes to invasion success, despite drought and inbreeding

James Cook University
Lopresti, Laura ; Montesinos Torres, Daniel ; Lach, Lori
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.25903/bdc2-p664&rft.title=Data for: Tolerance of intraspecific competition contributes to invasion success, despite drought and inbreeding&rft.identifier=10.25903/bdc2-p664&rft.publisher=James Cook University&rft.description=Background:This data is associated with a common garden experiment where we assessed the combined effects of induced inbreeding, intraspecific competition, and drought stress on the fitness of the highly invasive annual forb Senna obtusifolia (Fabaceae). We conducted a fully factorial experiment in which we grew seeds derived from self or outcross pollen, either alone or in competition with a conspecific, under drought or well-watered conditions. We measured plant performance across multiple life stages, including seed size and germination, biomass allocation, growth rate, reproductive output, and defence response. We found some evidence that a single generation of induced inbreeding reduced plant performance. A small level of inbreeding depression (δ = 0.19) suggested that S. obtusifolia can uniparentally reproduce with little fitness impact, at least in the short term. This may enhance its invasion success by ensuring that progeny are strong competitors when pollinators and mates are scarce, common conditions during early colonisation stages. Competition did reduce individual plant fitness, and this effect was exacerbated under drought stress, which highlighted that S. obtusifolia is tolerant to single stressors, but combined abiotic and biotic stress may result in important reductions on individual fitness. Critically, collective reproductive output outweighed the individual fitness costs per unit area demonstrating a positive density dependent response even under combined stressors. This data record contains: two .xlsx files containing data from experiment two .csv files containing data fed to R for calculations one .html file containing R markdown script and one .Rproj file one .txt file containing readme information Software/equipment used to create/collect the data: Equipment: Digital Video Recordings (Zero-X ZX-30 4K UHD Action Camera) Software: Windows Media Player - v 12.0.19041.84; Windows 11 OS Software/equipment used to manipulate/analyse the data: R - R-4.2.1; Windows 11 OS and Microsoft office - version 2108; Windows 11 OS&rft.creator=Lopresti, Laura &rft.creator=Montesinos Torres, Daniel &rft.creator=Lach, Lori &rft.date=2026&rft.coverage=James Cook University, Smithfield, Queensland&rft_rights=&rft_rights=CC BY 4.0: Attribution 4.0 International http://creativecommons.org/licenses/by/4.0&rft_subject=Plant invasion&rft_subject=Common garden experiment&rft_subject=Sicklepod&rft_subject=Intraspecific competition&rft_subject=Inbreeding&rft_subject=Plant fitness&rft_subject=Global change biology&rft_subject=Other biological sciences&rft_subject=BIOLOGICAL SCIENCES&rft_subject=Community ecology (excl. invasive species ecology)&rft_subject=Ecology&rft_subject=Terrestrial ecology&rft_subject=Expanding knowledge in the biological sciences&rft_subject=Expanding knowledge&rft_subject=EXPANDING KNOWLEDGE&rft.type=dataset&rft.language=English Access the data
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Background:This data is associated with a common garden experiment where we assessed the combined effects of induced inbreeding, intraspecific competition, and drought stress on the fitness of the highly invasive annual forb Senna obtusifolia (Fabaceae). We conducted a fully factorial experiment in which we grew seeds derived from self or outcross pollen, either alone or in competition with a conspecific, under drought or well-watered conditions. We measured plant performance across multiple life stages, including seed size and germination, biomass allocation, growth rate, reproductive output, and defence response. We found some evidence that a single generation of induced inbreeding reduced plant performance. A small level of inbreeding depression (δ = 0.19) suggested that S. obtusifolia can uniparentally reproduce with little fitness impact, at least in the short term. This may enhance its invasion success by ensuring that progeny are strong competitors when pollinators and mates are scarce, common conditions during early colonisation stages. Competition did reduce individual plant fitness, and this effect was exacerbated under drought stress, which highlighted that S. obtusifolia is tolerant to single stressors, but combined abiotic and biotic stress may result in important reductions on individual fitness. Critically, collective reproductive output outweighed the individual fitness costs per unit area demonstrating a positive density dependent response even under combined stressors.

This data record contains:

  • two .xlsx files containing data from experiment
  • two .csv files containing data fed to R for calculations
  • one .html file containing R markdown script and one .Rproj file
  • one .txt file containing readme information

Software/equipment used to create/collect the data:

Equipment: Digital Video Recordings (Zero-X ZX-30 4K UHD Action Camera)

Software: Windows Media Player - v 12.0.19041.84; Windows 11 OS

Software/equipment used to manipulate/analyse the data:

R - R-4.2.1; Windows 11 OS and Microsoft office - version 2108; Windows 11 OS

Created: 2026-01-20

Data time period: 13 03 2022 to 18 09 2024

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Spatial Coverage And Location

text: James Cook University, Smithfield, Queensland

Subjects
Biological Sciences | Common garden experiment | Community Ecology (Excl. Invasive Species Ecology) | Expanding Knowledge | Ecology | Expanding Knowledge | Expanding Knowledge in the Biological Sciences | Global Change Biology | Inbreeding | Intraspecific competition | Other Biological Sciences | Plant fitness | Plant invasion | Sicklepod | Terrestrial Ecology |

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Identifiers
  • DOI : 10.25903/BDC2-P664
  • Local : researchdata.jcu.edu.au//published/ebfa0b90675111f0a1a83d2d3fccb845