Reply on RC2

Опубликована: Май 8, 2024

Abstract. Fluvial drainage patterns in orogenic belts reflect the interaction between tectonics, climate, and lithology. The central South Tian Shan displays a complex fluvial pattern that shifts from longitudinal (flowing parallel to mountain ranges) west transverse across east. Whether such underlying of tectonic deformation, lithology, climatic changes, or influence surface processes within basin is often unclear. We focus here on anomalously large Saryjaz catchment SE Kyrgyzstan, which marks transition drainage. analyse topographic metrics including slope, river steepness (k_sn) integral proxy χ along profile, map spatial distribution characteristics knickpoints discern possible controls observed pattern. discriminate different origin: tectonic, lithologic, glacial, those linked transient waves incision. find series tributaries downstream sharp 180ᵒ bend main stem River, also striking increase channel steepness. Both observations indicate accelerated incision this lower reach catchment. Knickpoint elevations decrease downstream, whereas depth, values (measured tributary junctions) k_sn ratios are constant among tributaries. These results suggest driven “top-down” by large-magnitude river-capture event rather than “bottom-up” base-level fall. estimate an erodibility parameter ¹⁰Be derived catchment-average denudation rates use celerity knickpoints. started retreating at similar time, ca. 1.5 4.4 Myr ago. Considering timing constraints, we capture was likely overfill Neogene intermontane basins, potentially affected both climate factors.

Язык: Английский

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Altered metapopulation dynamics in a headwater specialist in geomorphically dynamic catchments

Freshwater Biology, Год журнала: 2024, Номер 69(9), С. 1203 - 1217

Опубликована: Июль 4, 2024

Abstract Human activities have widely disrupted the spatial ecological processes critical for population and ecosystem integrity. Local effects of altered sediment regimes in rivers are well explored, but how they impact connectivity at a catchment scale is less explored. In this paper we document evidence metapopulation dynamics headwater specialist, blackspotted topminnow ( Fundulus olivaceus ) catchments with geomorphically dynamic river mainstems. We quantified decade‐scale patterns fluvial geomorphic activity via planform analysis historical recent aerial imagery, gene flow F. single nucleotide polymorphisms, identified by genotype‐by‐sequencing. Mainstem streams narrowed increased sinuosity, probably recovery from historic flood events. Substantial variability response indicated underlying differences due to differential disturbance history sensitivity change. Multiple analytical approaches all found geography be major factor genetic structuring among catchments. Metrics differentiation heterozygosity within were related degree change inferred multivariate composite metric. Catchments more tended structuring. Five populations assigned adjacent Analysis presumed donor, recipient, mis‐assigned founder recipient probable subsequent allopatric recolonisation following local extirpations. Our results demonstrate complex nonlocal channel evolution on pool‐dwelling non‐lithophilous specialist. integrative approach allows strong insight into deeper aquatic ecosystems. F . ecologically dissimilar taxa traditionally anticipated respond sediment‐related disturbances demonstrates broader morphological can affect habitats beyond sedimentation stream bed.

Язык: Английский

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Climate‐Driven Topographic Asymmetry Enhanced by Glaciers: Implications for Drainage Reorganization in Glacial Landscapes

Geophysical Research Letters, Год журнала: 2024, Номер 51(13)

Опубликована: Июль 4, 2024

Abstract Climate contrasts across drainage divides, such as orographic precipitation, are ubiquitous in mountain ranges, and a result, topography is often asymmetric. During glacial periods, these climate gradients can generate asymmetric glaciation, which may modify topographic asymmetry drive divide migration during glacial‐interglacial cycles. Here we quantify caused by glaciation its sensitivity to different scenarios. Using an analytical model of steady‐state profile, find that the degree primarily controlled differences equilibrium line altitude divide. Our results show erosion respond same differently than fluvial erosion. When there precipitation divide, produces greater erosion, all else equal. These findings suggest glaciations promote reorganization landscape transience intermittently glaciated ranges.

Язык: Английский

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Drainage Reorganization and Intraspecific Genetic Diversity of Riverine Fish: Insights from the Ligurian Alps and Northern Apennines via Environmental DNA Metabarcoding

Authorea (Authorea), Год журнала: 2024, Номер unknown

Опубликована: Авг. 24, 2024

Mountain building reorganizes drainage networks, influencing riverine biodiversity. Northern Italy offers a natural experiment in the impact of tectonic and geomorphic processes on aquatic species distributions. We combined analysis with environmental DNA from rivers to assess influence tectonically driven reorganization genetic diversity, targeting an endemic fish species, Telestes muticellus (A. Risso, 1827). In Apennines, horizontal shortening topographic advection orogenic wedge have been hypothesized as leading river capture divide migration. addition, slab rollback has produced spatial transition contraction extension, which is more pronounced north south, normal faulting producing range-parallel only southern regions. contrast, adjacent Ligurian Alps are remnant Alpine orogen little modern deformation. found distinct zones characteristics including asymmetry frequency drainage. Analysis sequences shows cross-divide assemblage that correlate zonation. The Apennines show higher values directional measures change gain, loss, turnover; overlap nestedness. There positive correlation between distance, turnover Adriatic sites; there negative Since confined freshwater environments, one mechanisms can explain its differentiation.

Язык: Английский

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Drainage rearrangement in an intra-continental mountain belt: a case study from the central South Tian Shan, Kyrgyzstan

Earth Surface Dynamics, Год журнала: 2024, Номер 12(5), С. 973 - 994

Опубликована: Сен. 6, 2024

Abstract. Fluvial drainage patterns in orogenic belts reflect interactions among tectonics, climate, and lithology. The central South Tian Shan displays a complex fluvial pattern that shifts from longitudinal (flowing parallel to mountain ranges) the west transverse across east. Whether such underlying of tectonic deformation, lithology, or influence surface processes within basin is often unclear. We focus here on large Saryjaz catchment SE Kyrgyzstan, which marks transition between drainages. analyse topographic metrics including slope, river steepness (ksn), integral proxy (χ) along profile, we map spatial distribution characteristics knickpoints discern possible controls observed pattern. discriminate different origin, namely tectonic, lithologic, glacial, those linked transient waves incision. find series tributaries downstream sharp 180° bend main stem river, also striking increase channel steepness. Both observations indicate accelerated incision this lower reach catchment. Knickpoint elevations ksn below decrease downstream, whereas χt values (χ measured tributary junctions) remain near-constant tributaries. These results, together with comparison other rivers vicinity show no evidence knickpoints, suggest driven “top-down” by large-magnitude capture event rather than “bottom-up” uplift base-level fall. estimate an erodibility parameter 10Be-derived catchment-average denudation rates use celerity knickpoints. started retreating at similar time ca. 1.5 4.4 Myr ago. Considering timing constraints, was likely overfill Neogene intermontane basins, potentially affected both climate factors.

Язык: Английский

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