Seed size and capitulum position drive germination and dormancy responses to projected warming for the threatened dune endemic Cirsium pitcheri (Asteraceae)
| Autor: | Finote Gijsman, Pati Vitt |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Soil seed bank Context (language use) time‐to‐event analyses 010603 evolutionary biology 01 natural sciences 03 medical and health sciences Cirsium lcsh:QH540-549.5 survival curves Ecology Evolution Behavior and Systematics 030304 developmental biology Nature and Landscape Conservation Original Research 0303 health sciences Ecology biology dunes food and beverages Asteraceae biology.organism_classification climate change Agronomy Germination Cirsium pitcheri Threatened species Plant species Dormancy lcsh:Ecology |
| Zdroj: | Ecology and Evolution Ecology and Evolution, Vol 11, Iss 2, Pp 955-966 (2021) |
| ISSN: | 2045-7758 |
| Popis: | Among coastal plant species at risk from rapid environmental changes is the North American Great Lakes dune endemic Cirsium pitcheri. Despite being listed as federally threatened, little is known about how C. pitcheri seed attributes influence germination and dormancy‐break patterns in the context of climate change. Following a previous work where we found differences in the number and weight of C. pitcheri seeds among capitulum positions and study sites, here we examine the effects of seed attributes (capitulum position, seed weight, and site of origin) on the proportion and timing of C. pitcheri seed germination under temperature treatments that simulate projected warming in the Great Lakes (20/10, 25/10, and 30/10°C day/night). Our results demonstrate that C. pitcheri produces diverse cohorts of seeds with seed attributes that significantly influence the timing and probability of germination over a 3‐year soil seed bank. Cirsium pitcheri seed germination proportions were highest at 20°C and decreased successively at 25 and 30°C. Seeds from terminal capitula also had higher germination proportions and took longer to germinate than those from secondary capitula. Lastly, the effect of seed weight on germination probability depended on site of origin and capitulum position, with all effects varying in size and significance over time. Ultimately, our results highlight the considerable differences in germination patterns exhibited by seeds from different capitulum positions and sites of origin and provide insight into the dormancy‐break patterns that C. pitcheri might experience under predicted temperature rise in the Great Lakes region of North America. Cirsium pitcheri is a threatened thistle species endemic to the dunes of the North American Great Lakes. The attributes of seeds that it produces, like seed weight and site of origin, significantly influence seed germination and dormancy responses to predicted warming. |
| Databáze: | OpenAIRE |
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