Bluff to bluff: A field guide to floodplain geology and geomorphology of the Lower Congaree River Valley, South Carolina

Shelley, David; Werts, S. P.; Dvoracek, Doug; Armstrong, W.

doi:10.1130/2012.0029(02)

Cited by 5 publications

(7 citation statements)

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“…In late May in Congaree National Park, P. frontalis displays ardently across a forest of loblolly pines spreading along the convergence line between a bluff and the Congaree River floodplain (16). While the swarm stretches across hundreds of meters, most fireflies tend to coalesce into localized leks hovering above smaller parcels.…”

Section: Resultsmentioning

confidence: 99%

Chimera states among synchronous fireflies

Sarfati

Peleg

2022

Sci. Adv.

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Systems of oscillators often converge to a state of synchrony when sufficiently interconnected. Twenty years ago, the mathematical analysis of models of coupled oscillators revealed the possibility for complex phases that exhibit a coexistence of synchronous and asynchronous clusters, known as “chimera states.” Beyond their recurrence in theoretical models, chimeras have been observed under specifically designed experimental conditions, yet their emergence in nature has remained elusive. Here, we report evidence for the occurrence of chimeras in a celebrated realization of natural synchrony: fireflies. In video recordings of Photuris frontalis fireflies, we observe, within a single swarm, the spontaneous emergence of different groups flashing with the same periodicity but with a constant delay between them. From the three-dimensional reconstruction of the swarm, we demonstrate that these states are stable over time and spatially intertwined. We discuss the implications of these findings on the synergy between mathematical models and collective behavior.

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Section: Resultsmentioning

confidence: 99%

Chimera states among synchronous fireflies

Sarfati

Peleg

2022

Sci. Adv.

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“…In late May in Congaree National Park, Photuris frontalis displays ardently across a forest of loblolly pines spreading along the convergence line between a bluff and the Congaree River floodplain [16]. While the swarm stretches across hundreds of meters, most fireflies tend to coalesce into localized leks hovering above smaller parcels.…”

Section: Resultsmentioning

confidence: 99%

Chimera States among Synchronous Fireflies

Sarfati

Peleg

2022

Preprint

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Systems of oscillators, whether animate or inanimate, often converge to a state of collective synchrony, when sufficiently interconnected. Twenty years ago, the mathematical study of models of coupled oscillators revealed the possibility for complex phases which exhibit the coexistence of synchronous and asynchronous clusters, since then referred to as “chimera states”. Beyond their recurrence in theoretical models, chimera states have been observed in specifically-designed, non-biological experimental conditions, yet their emergence in nature has remained elusive. Here, we report robust evidence for the occurrence of chimera states in a celebrated realization of natural synchrony: fireflies. In video recordings of collective displays of Photuris frontalis fireflies, we observe, within a single swarm, the spontaneous emergence of different groups flashing with the same periodicity but with a constant time delay between them. From the three-dimensional reconstruction of the swarm, we demonstrate that these states are stable over time and spatially intertwined, but find no evidence of enhanced correlations in their spatial dynamics. We discuss the implications of these findings on the synergy between mathematical models and firefly collective behavior.

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“…Within the park, the USGS records water level at Cedar Creek (USGS Cedar Creek station, #02169672, Figure 1b). Water levels at this location are affected by both river inundation and runoff from upland source areas (Shelley et al., 2012; Xu et al., 2020). Two additional gauging stations outside of the study area provide water levels for the Santee River (USGS Santee River in Fort Motte, #02169810, rkm 48.4) and for the Wateree River (USGS Wateree River in Camden, #02148000, north of the study region, not shown Figure 1).…”

Section: Study Region and Hydrologic Conditionsmentioning

confidence: 99%

“…For reference, the along channel distance is reported with the prefix “rkm” for “river kilometer,” with rkm 0 at the upstream park boundary, increasing downstream. Railroad (rkm 38.3) and highway (rkm 42.6) berms are the major anthropogenic structures in the floodplain, consisting of embankment‐bridge systems, that likely affect floodplain circulation during high flows (Patterson et al., 1985; Sharitz & Allen, 2009; Shelley, 2007). The railroad embankment extends 3.7 km into the floodplain, after which the bridge is supported by 4.5 by 6.8 m piers, spaced ∼50 m apart that continues for 1.8 km (Figure 1b).…”

Section: Study Region and Hydrologic Conditionsmentioning

confidence: 99%

Floodplain Surface‐Water Circulation Dynamics: Congaree River, South Carolina, USA

Steeg

Torres

Viparelli

et al. 2023

Water Resources Research

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giving rise to sub-bankfull inundation. Discrete river-floodplain segments may experience the simultaneous occurrence of sub-bankfull and overbank flooding, or no flooding at all depending on heterogeneity in the along-channel and vertical structure of riverbanks and levees. The net result is highly a variable and complex floodplain flow (Xu et al., 2021), that can present abrupt current reversals (van der Steeg et al., 2021). Hence, complex flow dynamics develop in response to along-channel variations of river-floodplain coupling-decoupling, and by flow interactions with local topography. Indeed, complex floodplain flow dynamics have been reported by remote sensing (e.g.,

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Bluff to bluff: A field guide to floodplain geology and geomorphology of the Lower Congaree River Valley, South Carolina

Cited by 5 publications

References 0 publications

Chimera states among synchronous fireflies

Chimera states among synchronous fireflies

Chimera States among Synchronous Fireflies

Floodplain Surface‐Water Circulation Dynamics: Congaree River, South Carolina, USA

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