Pioneer salt marsh species Scirpus mariqueter disperses quicker in summer with seed contribution from current and last year

Jiang, Can; Li, Xiuzhen; Xue, Liming; Yan, Zhongzheng; Liang, Xia; Chen, Xuechu

doi:10.1016/j.ecss.2021.107682

Cited by 10 publications

(8 citation statements)

References 53 publications

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“…The soaked S. mariqueter seeds were washed away in August 2021, transported by tides, and then randomly trapped in mud cracks. Notably, the high germination rate of S. mariqueter seeds (seven days) and two days for anchorage in summer considerably favor seedling establishment (Jiang et al, 2022). This confirmed the rapid and transient process between seed germination and mud cracking (approximately 7 d).…”

Section: Ecological Functions Of Mud Cracks In Saltmarshessupporting

confidence: 59%

“…Mud cracks may be sighted across colonized areas whenever seedlings emerge. Similarly, patches of S. mariqueter were established simultaneously at the saltmarsh edges within a short period (Jiang et al, 2022), where mud cracking occurred. Nevertheless, the mechanisms associated with the ecological role of mud cracks in saltmarsh colonization remain unclear.…”

Section: Ecological Functions Of Mud Cracks In Saltmarshesmentioning

confidence: 99%

“…The climate is subtropical monsoon, with an annual average temperature of 15.5 and being located on an intertidal mudflat, which is influenced by irregular semidiurnal tides and two maximum and minimum tides (15-day intervals) occurring monthly. The maximum and average tide heights range from 4.62 to 5.95 m and from 1.96 to 3.08 m, respectively (Ge et al, 2008;Li et al, 2014;Jiang et al, 2022). Under normal weather conditions, the mean current velocity in the saltmarsh is approximately 0.1 m s −1 , while that in the low-lying mudflats is 0.3 m s −1 (Yang et al, 2020).…”

Section: Study Site and Field Experimentsmentioning

confidence: 99%

“…Narrow areas of mud cracks were distributed along the seaward edge of the saltmarsh, and extensive mud cracks were observed in the inner saltmarsh, where tidal flat elevation was relatively high (Figure 1). The saltmarsh plants are dispersed in a northwest and seaward direction owing to suitable elevation and hydrodynamics (Jiang et al, 2022). Propagules can be easily washed away at sites exposed to waves due to strong hydrodynamics.…”

Section: Study Site and Field Experimentsmentioning

confidence: 99%

“…The number of seeds, floating rate, and germination rate are crucial for saltmarsh plant establishment and dispersal. S. mariqueter establishment and dispersal are fast in summer, with high seed density (8,400 seeds/ m 2 ), a high floating rate (up to 80%), and a low germination rate (28%), being observed (Jiang et al, 2022). The high number of seeds produced ensures survival in each reproductive period (Delgado et al, 2001).…”

Section: Ecological Functions Of Mud Cracks In Saltmarshesmentioning

confidence: 99%

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Mud cracks promote colonization by pioneer saltmarsh plants

Jiang

Zhao

et al. 2023

Front. Mar. Sci.

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Saltmarshes are valued as key buffering ecosystems against global climate change and sea level rise. However, the knowledge deficit regarding links between colonization of saltmarsh fringes by plants and mud cracking in the lateral dimension considerably limits our understanding of marsh resilience. Here, the role of mud cracks in colonization by saltmarsh plants was investigated. A combination of field experiments, remote sensing, and experimental results revealed that: (1) potential mud cracking zones were formed at the seaward edge of saltmarshes under the influence of tide-induced wetting–drying cycles, where mud cracks were extensively distributed and colonized by new seedlings. (2) The seedling density in the mud cracks was higher than that in the patches, and seedlings in the mud cracks sprouted earlier than those in the patches. The results implied that mud cracking enhanced colonization by saltmarsh plants, rather than being a water stressor. (3) The two main ecological functions of mud cracks in saltmarsh colonization were acting as “seed traps” and “seedling growth promoters.” (4) Mud cracking could be a key factor influencing saltmarsh resilience, especially by promoting the colonization and dispersal of saltmarsh plants. Rapid colonization of potential zones with mud cracks could occur as soon as seeds are available. Our results could facilitate the development of appropriate saltmarsh rehabilitation strategies.

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Section: Ecological Functions Of Mud Cracks In Saltmarshessupporting

confidence: 59%

Section: Ecological Functions Of Mud Cracks In Saltmarshesmentioning

confidence: 99%

Section: Study Site and Field Experimentsmentioning

confidence: 99%

Section: Study Site and Field Experimentsmentioning

confidence: 99%

Section: Ecological Functions Of Mud Cracks In Saltmarshesmentioning

confidence: 99%

See 3 more Smart Citations

Mud cracks promote colonization by pioneer saltmarsh plants

Jiang

Zhao

et al. 2023

Front. Mar. Sci.

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The spatial pattern of Scirpus mariqueter expansion and the associated mechanism of self-organization using unmanned aerial vehicles and its significance for coastal wetland restoration

Gong,

Fang,

Gao

et al. 2023

Environ Monit Assess

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Short-term evolution pattern in salt marsh landscapes: the importance of physical constraints

Xue,

Li,

et al. 2024

Landsc Ecol

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Context Salt marsh landscapes at the land-sea interfaces exhibit contrasting spatiotemporal dynamics, resulting from varying physical constraints that limit new marsh establishment. The expansion of salt marsh landscapes towards the sea or their retreat towards the land is determined by patch-level changes, relying on the balance of power between the intrinsic biota traits and external physical disturbances. Objectives Examine how marsh dynamics respond to physical constraints, and clarify the pathway from coupled physical processes involving hydrodynamic forces, sediment transport, and morphological changes to rapid patch evolution and landscape changes. Methods We defined and distinguished four types of marsh changes based on patch proximities from five-month drone images in two typical marsh pioneer zones of the Yangtze Estuary, China: outlying expansion, edge expansion, infilling expansion, and retreat. Hydrodynamics and sediment transport were synchronously measured and compared near the two marsh edges, and morphological changes were generated by drone-derived digital elevation models (DEMs). Results We identified distinct seasonal patterns of net marsh expansion at the accretion-prone site, that is: Net marsh expansion started from the outlying expansion in spring, followed by edge expansion in summer and infilling expansion in autumn. However, at the erosion-prone site that experienced high bed shear stress, low sediment availability and high seaward sediment transport, we only observed limited infilling and edge expansion in spring. This suggests that the potential for long-distance patch formation beyond the initial marsh edges is diminished in areas subjected to intensive physical disturbances. Conclusions Patch evolution dynamics in response to site-specific physical constraints drive state differentiation of salt marsh landscape changes. Consequently, the heterogeneous evolution in salt marsh landscapes should be taken into account in restoration practice.

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Pioneer salt marsh species Scirpus mariqueter disperses quicker in summer with seed contribution from current and last year

Cited by 10 publications

References 53 publications

Mud cracks promote colonization by pioneer saltmarsh plants

Mud cracks promote colonization by pioneer saltmarsh plants

The spatial pattern of Scirpus mariqueter expansion and the associated mechanism of self-organization using unmanned aerial vehicles and its significance for coastal wetland restoration

Short-term evolution pattern in salt marsh landscapes: the importance of physical constraints

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