Seed aggregation tips the scale in plant competition

Ghazian, Nargol; Braun, Jenna; Owen, Malory; Lortie, Christopher J.; Cho, Calvin

doi:10.1007/s42974-021-00064-5

Cited by 3 publications

(1 citation statement)

References 54 publications

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“…The germination rate of plants with an aggregated distribution was higher ( Ghazian et al., 2021 ). After establishment, the interspecific competitiveness of seedlings is enhanced based on the advantages of aggregation, which can alleviate competition among native species and significantly increase their survival rate ( Čuda et al., 2015 ; El-Barougy et al., 2020 ).…”

Section: Discussionmentioning

confidence: 99%

Factors affecting establishment and population growth of the invasive weed Ambrosia artemisiifolia

Zhao,

Xue,

Liu

et al. 2023

Front. Plant Sci.

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Ambrosia artemisiifolia is a highly invasive weed. Identifying the characteristics and the factors influencing its establishment and population growth may help to identify high invasion risk areas and facilitate monitoring and prevention efforts. Six typical habitats: river banks, forests, road margins, farmlands, grasslands, and wastelands, were selected from the main distribution areas of A. artemisiifolia in the Yili Valley, China. Six propagule quantities of A. artemisiifolia at 1, 5, 10, 20, 50, and 100 seeds m-2 were seeded by aggregation, and dispersion in an area without A. artemisiifolia. Using establishment probability models and Allee effect models, we determined the minimum number of seeds and plants required for the establishment and population growth of A. artemisiifolia, respectively. We also assessed the moisture threshold requirements for establishment and survival, and the influence of native species. The influence of propagule pressure on the establishment of A. artemisiifolia was significant. The minimum number of seeds required varied across habitats, with the lowest being 60 seeds m-2 for road margins and the highest being 398 seeds for forests. The minimum number of plants required for population growth in each habitat was 5 and the largest number was 43 in pasture. The aggregation distribution of A. artemisiifolia resulted in a higher establishment and survival rate. The minimum soil volumetric water content required for establishment was significantly higher than that required for survival. The presence of native dominant species significantly reduced the establishment and survival rate of A. artemisiifolia. A. artemisiifolia has significant habitat selectivity and is more likely to establish successfully in a habitat with aggregated seeding with sufficient water and few native species. Establishment requires many seeds but is less affected by the Allee effect after successful establishment, and only a few plants are needed to ensure reproductive success and population growth in the following year. Monitoring should be increased in high invasion risk habitats.

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Section: Discussionmentioning

confidence: 99%

Factors affecting establishment and population growth of the invasive weed Ambrosia artemisiifolia

Zhao,

Xue,

Liu

et al. 2023

Front. Plant Sci.

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Spatial pattern of seed arrival has a greater effect on plant diversity than does soil heterogeneity in a grassland ecosystem

Kjaer,

Houseman,

Luu

et al. 2024

Plant Soil

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Background and Aims Species diversity is expected to increase with environmental heterogeneity. For plant communities, this pattern has been confirmed by numerous observational studies. Yet, experimental studies yield inconsistent results potentially because of how experiments create soil heterogeneity or because seeds were sown homogeneously. Using a field experiment, we tested how soil heterogeneity, plant spatial aggregation via seed arrival, and grain size influence plant species richness in a restored grassland. Methods We manipulated soil heterogeneity and seed arrival in 0.2 × 0.2 or 0.4 × 04 m patches within each 4.0 × 4.6 m plot and allowed community assembly to occur for 4 growing seasons. Results Despite quantifiable soil differences, soil heterogeneity did not impact total or sown species richness, but did weakly influence non-sown richness. Richness differences were driven by non-sown plant species that likely exhibited higher establishment in aggregated plots due to decreased interspecific competition and conspecific facilitation. Conclusion Our results suggest that fine-scale soil heterogeneity weakly affects prairie plant diversity, but heterogeneous plant spatial structure can have a stronger effect on diversity. These results suggest that plant colonization may be the primary source of environmental heterogeneity and may explain inconsistent results from soil heterogeneity experiments.

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Dramatic changes in the horizontal structure of mangrove forests in the largest delta of the northern Beibu Gulf, China

Wang,

Dai,

Huang

et al. 2023

Acta Oceanol. Sin.

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Seed aggregation tips the scale in plant competition

Cited by 3 publications

References 54 publications

Factors affecting establishment and population growth of the invasive weed Ambrosia artemisiifolia

Factors affecting establishment and population growth of the invasive weed Ambrosia artemisiifolia

Spatial pattern of seed arrival has a greater effect on plant diversity than does soil heterogeneity in a grassland ecosystem

Dramatic changes in the horizontal structure of mangrove forests in the largest delta of the northern Beibu Gulf, China

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