Potential risks of Tithonia diversifolia in Yunnan Province under climate change

Abstract

Yunnan province is known for its extraordinarily rich biodiversity, but this is threatened by invasive species under climate change. In the present study, the current and future potential distribution of an invasive grass-Tithonia diversifolia A. Gray in Yunnan province were predicted by species distribution modeling, under two climate change conditions (RCP2.6 and RCP8.5) through to 2050s. In addition, the potential risk of T. diversifolia to the protected areas of Yunnan was examined. Our results showed that the potential distribution areas of T. diversifolia would increase by 12 and 93% by 2050s, under RCP2.6 and RCP8.5, respectively. Yunnan's protected areas are now susceptible to T. diversifolia, and the scope of this plant's effects would continue to expand under climate change. A total of 26 protected areas are currently impacted by T. diversifolia, in a total affected range area of 2,822 km 2 , but by 2050s, this is predicted to increase by 23 and 53%, and would lead to one and 13 protected areas newly threatened under RCP2.6 and RCP8.5, respectively. These results suggest that T. diversifolia would benefit from global warming, we should prevent further global warming. In addition, human disturbance should be reduced and prohibited to protect native plants and forest ecosystem in southern, southeastern and northwestern part of Yunnan.

COMPORTAMIENTO BIOLÓGICO DE SEIS CULTIVARES DE Tithonia diversifolia (Helms.) A. Gray

“…Al respecto se reporta que T. diversifolia se desarrolla favorablemente en un rango de temperatura y precipitaciones entre 15-31ºC y 100-2000 mm, respectivamente (Kandungu et al, 2013). Dai et al, (2021) en un estudio mediante modelación matemática de la expresión invasiva de T. diversifolia en el escenario del actual cambio climático, Tabla 6. Efecto combinado de la localidad, época climática y cultivar en la relación hoja/tallo y porcentaje de floración.…”

“…Entre las localidades en estudio, El Carmen, Canuto y S. Antonio, se obtuvieron rangos de temperatura entre 20. 1-27; 20.8-29.6; 21.4-28.6ºC, en orden, mostrando intervalos de nueve grados de diferencia entre mínimas y máximas; estas diferencias o rangos tan ajustados se relacionan con que, la duración de los días y cantidad de radiación solar son similares en todo el Ecuador (12 horas luz), por lo cual se reduce la variación de la temperatura a 3ºC entre meses, rangos que no son significativos para generar modificaciones importantes en el crecimiento y desarrollo de la T. diversifolia (Dai et al, 2021).…”

Photosynthetic response dynamics in the invasive species Tithonia diversifolia and two co-occurring native shrub species under fluctuating light conditions

“…This species can reproduce both sexually, with a large production of seeds, and asexually. Once its population is established, it quickly forms dense monospecific stands by inhibiting the germination and growth of neighboring species ( Oyerinde et al., 2009 ; Otusanya and Ilori, 2012 ; Kato-Noguchi, 2020 ), leading to a decrease in biodiversity ( Obiakara and Fourcade, 2018 ; Dai et al., 2021 ). It can invade a variety of habitats.…”