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225 results for “Riverine”
Fig. 6 in Pelvic-Fin Brooding In A New Species Of Riverine Ricefish (Atherinomorpha: Beloniformes: Adrianichthyidae) From Tana Toraja, Central Sulawesi, Indonesia
Fig. 6. Bayesian phylogeny of extant ricefishes based on 16s rDNA sequences. Scale bar indicates evolutionary distance and numbers at nodes represent posterior probabilities. The endemic radiation of ricefishes from Sulawesi is referred to as Oryzias celebensis group; Oryzias eversi specimens are highlighted.
Fig. 5 in Pelvic-Fin Brooding In A New Species Of Riverine Ricefish (Atherinomorpha: Beloniformes: Adrianichthyidae) From Tana Toraja, Central Sulawesi, Indonesia
Fig. 5. Type locality of Oryzias eversi, about 8 km south of Rantepao, Tana Toraja, Central Sulawesi, Indonesia. (Photograph by: Hans-Georg Evers).
Fig. 3. A in Pelvic-Fin Brooding In A New Species Of Riverine Ricefish (Atherinomorpha: Beloniformes: Adrianichthyidae) From Tana Toraja, Central Sulawesi, Indonesia
Fig. 3. A, Oryzias eversi, male, not preserved; B, Oryzias eversi, female carrying eggs, not preserved; C, urogenital pore of female Oryzias eversi with attaching filaments, after hatching of the embryos. (Photographs by: Hans-Georg Evers).
Fig. 4 in Pelvic-Fin Brooding In A New Species Of Riverine Ricefish (Atherinomorpha: Beloniformes: Adrianichthyidae) From Tana Toraja, Central Sulawesi, Indonesia
Fig. 4. Map of Sulawesi, with a black star highlighting the type locality of Oryzias eversi in the Toraja highlands (Map by: Thomas von Rintelen, modified).
Fig. 1. A in Pelvic-Fin Brooding In A New Species Of Riverine Ricefish (Atherinomorpha: Beloniformes: Adrianichthyidae) From Tana Toraja, Central Sulawesi, Indonesia
Fig. 1. A, Oryzias eversi, new species, MZB 20780, holotype, male, 35.8 mm SL; B, ZFMK 44939, paratype, female, 34.9 mm SL.
Data for "Global Riverine Export of Dissolved Lignin Constrained by Hydrology, Geomorphology and Land-Cover"
<p>Dataset for the "Global Riverine Export of Dissolved Lignin Constrained by Hydrology, Geomorphology and Land-Cover". Dataset 01 includes site locations, basin area, dissolved organic carbon (DOC), dissolved lignin concentration and relevant references. Dataset 03 includes mean/discharge-weighted DOC, mean/discharge-weighted dissolved lignin concentrations. Dataset 03 includes geomorphological, climatic, hydrological and land-cover data for the 25 rivers. Dataset 04 includes the reconstructed yield of dissolved lignin and basin area of the 79 rivers.</p>
Scripts of data selection and analysis: role of community size in driving spatial variation in riverine fish metacommunities around the world
<p>Here we describe how we obtained and analyzed data for the manuscript: High compositional dissimilarity among small communities is decoupled from environmental variation, accepted for publication in Oikos. (10.1111/oik.09802). A preprint is also available: https://doi.org/10.32942/osf.io/vngse</p> <p>We investigated the role of community size in mediate the strength of ecological drift and environmental selection in driving community spatial variation in metacommunities. </p>
Implications of headwater contact zones for the riverine barrier hypothesis: a case study of the Blue-capped Manakin (Lepidothrix coronata)
<p>Rivers frequently delimit the geographic ranges of species in the Amazon Basin. These rivers also define the boundaries between genetic clusters within many species, yet river boundaries have been documented to break down in headwater regions where rivers are narrower. To explore the evolutionary implications of headwater contact zones in Amazonia, we examined genetic variation in the Blue-capped Manakin (<em>Lepidothrix coronata</em>), a species previously shown to contain several genetically and phenotypically distinct populations across the western Amazon Basin. We collected restriction site-associated DNA sequence data (RADcap) for 706 individuals and found that spatial patterns of genetic structure indicate rivers, particularly the Amazon and Ucayali, are major dispersal barriers for <em>L. coronata</em> along a distance of more than 3000 km. We also found evidence that genetic connectivity is elevated across several headwater regions, highlighting the importance of headwater gene flow for models of Amazonian diversification. The headwaters of the Ucayali River provide a notable exception to findings of headwater gene flow by harboring non-admixed populations of <em>L. coronata</em> on opposite sides of a <1 km-wide river channel with a known dynamic history, potentially suggesting that additional prezygotic barriers are limiting gene flow in this region. </p>
Data from: Reduced sampling intensity through key sampling site selection for optimal characterization of riverine fish communities by eDNA metabarcoding
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Implications of headwater contact zones for the riverine barrier hypothesis: a case study of the Blue-capped Manakin (Lepidothrix coronata)
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Going with the flow? Relative importance of riverine hydrologic connectivity versus tidal influence for spatial structure of genetic diversity and relatedness in a foundational submersed aquatic plant
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Climate warming shifts riverine macroinvertebrate communities to be more sensitive to chemical pollutants
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Anthropogenic nitrogen Balance and Riverine Nitrogen Footprint of Agriculture in the Mississippi-Atchafalaya River Basin during 1970-2019
These data support the findings of a manuscript by Lu et al. under review in Environmental Research Letters. We used data synthesis and a well-calibrated hydro-ecological model to quantify the dynamics and controls of the riverine N footprint (RNF) within the Mississippi-Atchafalaya River Basin (MARB) from 1970 to 2019. These supportive data include (1) Annual synthetic N fertilizer and manure N input from 1970 to 2019 in sub-basins in the MARB; (2) Annual N inputs, outputs, and N balance from 1970 to 2017 in the MARB; (3) Changes in crop production, N load and riverine N footprint in response to key agricultural activities in MARB; (4) Changes in crop production, N load, and riverine N footprint under key agricultural activities at sub-basin level; (5) Annual acreage of major grain crops and total cropland areas in sub-basins of the MARB.
The Influence of Glacial Cover on Riverine Silicon and Iron Exports in Chilean Patagonia
<p>Data linked to manuscript 'The Influence of Glacial Cover on Riverine Silicon and Iron Export in Chilean Patagonia; <em>Global Biogeochemical Cycles</em>' </p>
Quantifying thermal exposure for migratory riverine species: phenology of Chinook salmon populations predicts thermal stress
<p>Migratory species are particularly vulnerable to climate change because habitat throughout their entire migration cycle must be suitable for the species to persist. For migratory species in rivers, predicting climate change impacts is especially difficult because there is a lack of spatially-continuous and seasonally-varying stream temperature data, habitat conditions can vary for an individual throughout its life cycle, and vulnerability can vary by life stage and season. To predict thermal impacts on migratory riverine populations, we first expanded a spatial stream network model to predict mean monthly temperature for 465,775 river km in the western U.S., and then applied simple yet plausible future stream-temperature change scenarios. We then joined stream temperature predictions to 44,396 spatial observations and life stage-specific phenology (timing) for 26 ecotypes (i.e. geographically distinct population groups expressing one of four distinct seasonal migration patterns) of Chinook salmon (<i>Oncorhynchus tshawytscha</i>), a phenotypically diverse anadromous salmonid that is ecologically and economically important but declining throughout its range. Thermal stress, assessed for each life stage and ecotype based on federal criteria, was influenced by migration timing rather than latitude, elevation, or migration distance, such that sympatric ecotypes often showed differential thermal exposure. Early-migration phenotypes were especially vulnerable due to prolonged residency in inland streams during the summer. We evaluated the thermal suitability of 31,699 stream km which are currently blocked by dams to explore reintroduction above dams as an option to mitigate the negative effects of our warmer stream temperature scenarios. Our results showed that negative impacts of stream temperature warming can be offset for almost all ecotypes if formerly occupied habitat above dams is made available. Our approach of combining spatial distribution and phenology data with spatially- and temporally-explicit temperature predictions enables researchers to examine thermal exposure of migrating populations that use seasonally-varying habitats.</p>
Natural toxic impact and thyroid signaling interplay orchestrates riverine adaptive divergence of salmonid fish
<p>Abstract 1. Adaptive radiation in fishes has been actively investigated over the last decades. Along with numerous well-studied cases of lacustrine radiation, some examples of riverine sympatric divergence have been recently discovered. In contrast to the lakes, the riverine conditions do not provide evident stability in the ecological gradients. Consequently, external factors triggering the radiation, as well as developmental mechanisms underpinning it, remain unclear. 2. Herein, we present the comprehensive study of external and internal drivers of the riverine adaptive divergence of the salmonid fish Salvelinus malma. In the Kamchatka River, N-E Asia, this species splits in the reproductively isolated morphs that drastically differ in ecology and morphology: the benthivorous Dolly Varden (DV) and the piscivorous Stone charr (SC). 3. To understand why and how these morphs originated, we performed a series of field and experimental work, including common-garden rearing, comparative ontogenetic, physiological and endocrinological analyses, hormonal "engineering" of phenotypes, and acute toxicological tests. 4. We revealed that the type of spawning ground acts as the main external factor driving the radiation of S. malma. In contrast to DV spawning in the leaf krummholz zone, SC reproduces in the zone of coniferous forest, which litter has a toxic impact on developing fishes. SC enhances resistance to the toxicants via metabolism acceleration provided by the elevated thyroid hormone content. These physiological changes lead to the multiple heterochronies resulting in a specific morphology and SC's expansion into a piscivorous niche. 5. Salvelinus malma represents a notable example of how the thyroid axis contributes to the generation of diverse phenotypic outcomes underlying the riverine sympatric divergence. Our findings, along with the paleoecology data concerning spruce forest distribution during the Pleistocene, provide an opportunity to reconstruct a scenario of S. malma divergence. Taken together, obtained results with the data of the role of thyroid hormones in the ontogeny and diversification of fishes contribute a resource to consider the thyroid axis as a prime director orchestrating the phenotypic plasticity promoting evolutionary diversification under the changing environmental conditions. 06-Jan-2021</p>
Common barriers, but temporal dissonance: genomic tests suggest ecological and paleo-landscape sieves structure a coastal riverine fish community
<p>Assessments of spatial and temporal congruency across taxa from genetic data provide insights into the extent to which similar processes structure communities. However, for coastal regions that are affected continuously by cyclical sea-level changes over the Pleistocene, congruent interspecific response will not only depend upon co-distributions, but also on similar dispersal histories among taxa. Here, we use SNPs to test for concordant genetic structure among four co-distributed taxa of freshwater fishes (Teleostei: Characidae) along the Brazilian Atlantic coastal drainages. Based on population relationships and hierarchical genetic structure analyses, we identify all taxa share the same geographic structure suggesting the fish utilized common passages in the past to move between river basins. In contrast to this strong spatial concordance, model-based estimates of divergence times indicate that despite common routes for dispersal, these passages were traversed by each of the taxa at different times resulting in varying degrees of genetic differentiation across barriers with most divergences dating to the Upper Pleistocene, even when accounting for divergence with gene flow. Interestingly, when this temporal dissonance is viewed through the lens of the species-specific ecologies, it suggests that an ecological sieve influenced whether species dispersed readily, with an ecological generalist showing the highest propensity for historical dispersal among the isolated rivers of the Brazilian coast (i.e., the most recent divergence times and frequent gene flow estimated for barriers). We discuss how our findings, and in particular what the temporal dissonance, despite common geographic passages, suggest about past dispersal structuring coastal communities as a function of ecological and paleo-landscape sieves.</p>
Modeled and observed river water temperature and discharge in the paper "Riverine heat waves on the rise, outpacing air heat waves"
<div>The observed and modeled data – mean daily water temperature (WT, °C) and mean daily discharge (Q,<em> </em>ft<sup>3</sup>/s) modeled by an LSTM model (averaged over 5 model runs) – for 1471 sites over 1980-2022 can be found here. Out of these 1471 sites, 1276 sites had good model performance and were used to identify and analyse air and riverine heat waves (RHW) in the paper "Riverine heat waves on the rise, outpacing air heat waves". </div> <div> <div> </div> </div>
Spatiotemporal changes in riverine input into the Eocene North Sea revealed by strontium isotope and barium analysis of bivalve shells
<p>Extended data and calculations belonging to this study are summarized in the supplementary material. These supplements contain the following supplementary data files: </p> <ul> <li>Supplementary material: supplementary Figure S1</li> <li>Supplementary data 1: Element and isotope data for each individual shell</li> <li>Supplementary data 2: <sup>87</sup>Sr/<sup>86</sup>Sr salinity variability reconstruction</li> <li>Supplementary data 3: Stratigraphy for sampling locations</li> <li>Supplementary data 4: <sup>87</sup>Sr/<sup>86</sup>Sr data for recent oyster shells</li> <li>Supplementary data 5: Extended strontium isotope data</li> </ul>
Gene flow influences the genomic architecture of local adaptation in six riverine fish species
<p>Understanding how gene flow influences adaptive divergence is important for predicting adaptive responses. Theoretical studies suggest that when gene flow is high, clustering of adaptive genes in fewer genomic regions would protect adaptive alleles from recombination and thus be selected for, but few studies have tested it with empirical data. Here, we used RADseq to generate genomic data for six fish species with contrasting life histories from six reaches of the Upper Mississippi River System, USA. We used four differentiation-based outlier tests and three genotype-environment association analyses to define neutral SNPs and outlier SNPs that were putatively under selection. We then examined the distribution of outlier SNPs along the genome and investigated whether these SNPs were found in genomic islands of differentiation and inversions. We found that gene flow varied among species, and outlier SNPs were clustered more tightly in species with higher gene flow. The two species with the highest overall <em>F</em><sub>ST</sub> (0.0303 - 0.0720) and therefore lowest gene flow showed little evidence of clusters of outlier SNPs, with outlier SNPs in these species spreading uniformly across the genome. In contrast, nearly all outlier SNPs in the species with the lowest <em>F</em><sub>ST</sub> (0.0003) were found in a single large putative inversion. Two other species with intermediate gene flow (<em>F</em><sub>ST</sub> ~ 0.0025 - 0.0050) also showed clustered genomic architectures, with most islands of differentiation clustered on a few chromosomes. Our results provide important empirical evidence to support the hypothesis that increasingly clustered architectures of local adaptation are associated with high gene flow. </p>
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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