How Smooth and Manila Grass and Their Hybrids Handle Cold and Heat Waves

Jim Crocker
4th April, 2025

How Smooth and Manila Grass and Their Hybrids Handle Cold and Heat Waves

Canonical correspondence analysis reveals that seasonal plant trait variations are primarily driven by air temperature for the native cordgrass (Spartina maritima) and its hybrid S. maritima × densiflora, while the invasive alien cordgrass (S. densiflora) and its reciprocal hybrid respond more strongly to sediment salinity.

Image adapted from: Álvarez et al. / CC BY (Source)

Key Findings

  • In Guadiana Marshes, hybrid Spartina plants adapt more flexibly to extreme temperatures than their native and invasive parents
  • Native Spartina maritima effectively adjusts to seasonal changes, while invasive S. densiflora mainly responds to salinity and less to temperature shifts
  • These hybrids could thrive under increasing climate extremes, potentially altering salt marsh ecosystems
Climate change is intensifying extreme weather events, such as cold snaps and heat waves, which pose significant challenges to plant survival and biodiversity. Additionally, the spread of invasive plant species is altering ecosystems worldwide. Understanding how different plant species respond to these pressures is crucial for predicting and managing the impacts of environmental changes. A recent study conducted by researchers at the Universidad de Sevilla[1] sheds light on the resilience of native and invasive Spartina species and their hybrids under extreme climatic conditions. The study focused on three types of Spartina plants: the native Spartina maritima, the invasive Spartina densiflora, and their reciprocal hybrids. Spartina species are vital components of salt marsh ecosystems, which are among the most productive and dynamic environments on the planet. These plants play a crucial role in shoreline stabilization, sediment trapping, and providing habitat for various wildlife species. However, the increasing frequency of extreme weather events due to climate change threatens these ecosystems' stability and sustainability. To investigate the responses of these Spartina taxa, the researchers examined 25 biochemical and physiological traits during a cold snap in winter and a heat wave in summer in the Guadiana Marshes located in the Southwest Iberian Peninsula. These traits included factors like photosynthetic pigment concentrations, leaf morphology, and biomass production, which are indicators of the plants' health and ability to adapt to changing conditions. The findings revealed that the hybrid Spartina taxa, particularly the Spartina maritima × densiflora hybrids, exhibited what is known as transgressive acclimation. This means that the hybrids displayed a broader range of responses to air temperature changes compared to their parent species. Such transgressive responses can provide hybrids with enhanced adaptability, allowing them to thrive in more extreme and variable conditions. In contrast, the native Spartina maritima demonstrated a high capacity for acclimation to seasonal meteorological changes, showcasing its resilience to varying temperatures throughout the year. On the other hand, the invasive Spartina densiflora showed limited acclimation responses to seasonal air temperature changes, primarily reacting to sediment salinity instead. This behavior aligns with previous research that highlighted S. densiflora's reliance on phenotypic plasticity—a plant's ability to alter its physiology or morphology in response to environmental conditions[2][3]. Despite its low genetic diversity, as revealed in earlier studies[3], S. densiflora has managed to establish itself across a wide range of environments by being highly adaptable. However, the current study suggests that while S. densiflora is resilient in terms of salinity, it may be less responsive to temperature fluctuations compared to its native counterpart. The role of phenotypic plasticity in plant invasions has been a subject of considerable interest. A meta-analysis conducted in a previous study found that invasive species generally exhibit higher phenotypic plasticity than non-invasive species[4]. This plasticity allows invasive plants to adjust rapidly to different environmental conditions, giving them a competitive edge over native species. However, the same study also noted that non-invasive species often maintain better fitness under resource-limited conditions, indicating that the advantages of plasticity may depend on the specific environmental context[4]. The current research builds on these findings by demonstrating that hybrid Spartina taxa not only inherit this plasticity but may also exceed the performance of their parent species under extreme conditions. The methods employed in the Universidad de Sevilla study involved both field measurements and controlled experiments in a common garden setting. By comparing the plants in their natural marsh environment with those grown under uniform conditions, the researchers could distinguish between phenotypic plasticity and genetic differentiation as mechanisms of adaptation. The results showed that the variations observed in the field were primarily due to phenotypic plasticity rather than genetic differences, reinforcing the idea that S. densiflora's success as an invasive species is largely due to its ability to adjust its traits in response to environmental changes[2]. One of the key implications of this study is the potential for hybrid species to play a significant role in the future dynamics of salt marsh ecosystems under climate change. The enhanced acclimation capabilities of Spartina hybrids suggest that they could become more prevalent as environmental conditions become more extreme and variable. This shift could have profound effects on biodiversity, ecosystem functioning, and the stability of salt marsh habitats. Furthermore, the study highlights the importance of considering both genetic and phenotypic factors when assessing plant resilience and adaptability. While genetic diversity is often seen as a cornerstone of species' ability to cope with environmental changes, phenotypic plasticity can provide a more immediate and flexible response mechanism. This is particularly relevant for invasive species like S. densiflora, which may not have high genetic diversity but can still thrive through plastic responses to their environment[3]. In conclusion, the research from the Universidad de Sevilla offers valuable insights into how native and invasive Spartina species, along with their hybrids, respond to extreme climatic events. By demonstrating the superior acclimation abilities of Spartina hybrids, the study underscores the complex interplay between genetic factors and phenotypic plasticity in determining plant resilience. As climate change continues to reshape ecosystems, understanding these mechanisms will be essential for developing effective conservation and management strategies to preserve biodiversity and maintain the health of vital habitats like salt marshes.

BiochemEcologyPlant Science

References

Main Study

1) Ecophysiological and biochemical responses to cold and heat waves of native Spartina maritima, alien S. densiflora and their reciprocal hybrids

Published 1st April, 2025

https://doi.org/10.1007/s00425-025-04675-4

Related Studies

2) Phenotypic plasticity of invasive Spartina densiflora (Poaceae) along a broad latitudinal gradient on the Pacific Coast of North America.

https://doi.org/10.3732/ajb.1400014

3) Low genetic diversity contrasts with high phenotypic variability in heptaploid Spartina densiflora populations invading the Pacific coast of North America.

https://doi.org/10.1002/ece3.4063

4) Do invasive species show higher phenotypic plasticity than native species and, if so, is it adaptive? A meta-analysis.

https://doi.org/10.1111/j.1461-0248.2011.01596.x


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