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InCreek Paths and Federal Roads, Angela Pulley Hudson offers a new understanding of the development of the American South by examining travel within and between southeastern Indian nations and the southern states, from the founding of the United States until the forced removal of southeastern Indians in the 1830s.During the early national period, Hudson explains, settlers and slaves made their way along Indian trading paths and federal post roads, deep into the heart of the Creek Indians' world. Hudson focuses particularly on the creation and mapping of boundaries between Creek Indian lands and the states that grew up around them; the development of roads, canals, and other internal improvements within these territories; and the ways that Indians, settlers, and slaves understood, contested, and collaborated on these boundaries and transit networks.While she chronicles the experiences of these travelers--Native, newcomer, free, and enslaved--who encountered one another on the roads of Creek country, Hudson also places indigenous perspectives squarely at the center of southern history, shedding new light on the contingent emergence of the American South.

This book explores the history of a Native American family using a rich collection of sources, including G. W. Grayson's never-before studied forty-four volume diary. At the heart of the narrative is a fact suppressed to this day by some Graysons: one branch of the family is of African descent. Focusing on five generations from 1780 to 1920, this book reveals the terrible compromises that Indians had to make to survive in the shadow of the expanding American republic. Overwhelmed by the racial hierarchy of the United States, American Indians disowned their kin, enslaved their relatives, and fought each other on the battlefield. In the 18th-century native South, when the Graysons first welcomed Africans into their family, black-Indian relationships were common and bore little social stigma. But as American slave plantations began to spread across Indian lands, race took on ever greater significance. Native American families found that their survival depended on distancing themselves from their black relatives. The black and Indian Graysons survived the invasion of the Creek Nation by US troops in 1813 and again in 1836, endured Indian removal and the Trail of Tears, battled each other in the Civil War, and weathered the destruction of the Creek Nation in the 1890s. When they finally became American citizens in 1907, Oklahoma law defined some Graysons as white, some as black. By this time, the two sides of the family, divided by race, barely acknowledged each other.

A nine-year whole-ecosystem experiment demonstrates that nutrient enrichment, a global problem in coastal ecosystems, can be a driver of salt-marsh loss. Excess nutrients threaten salt marshes Salt marshes provide important ecosystem services such as storm protection for coastal cities, nutrient removal and carbon sequestration, but despite protective measures these ecosystems are in decline. Nine years of data from a whole-ecosystem nutrient-enrichment experiment now demonstrate that current levels of coastal nutrient loading can alter key salt-marsh-ecosystem properties, leading to the collapse of creek banks and, ultimately, the conversion of salt marsh into mudflat. The potential deterioration of coastal marshes owing to eutrophication adds another dimension to the challenge of managing nitrogen while meeting food-production demands in the twenty-first century. Salt marshes are highly productive coastal wetlands that provide important ecosystem services such as storm protection for coastal cities, nutrient removal and carbon sequestration. Despite protective measures, however, worldwide losses of these ecosystems have accelerated in recent decades 1 . Here we present data from a nine-year whole-ecosystem nutrient-enrichment experiment. Our study demonstrates that nutrient enrichment, a global problem for coastal ecosystems 2 , 3 , 4 , can be a driver of salt marsh loss. We show that nutrient levels commonly associated with coastal eutrophication increased above-ground leaf biomass, decreased the dense, below-ground biomass of bank-stabilizing roots, and increased microbial decomposition of organic matter. Alterations in these key ecosystem properties reduced geomorphic stability, resulting in creek-bank collapse with significant areas of creek-bank marsh converted to unvegetated mud. This pattern of marsh loss parallels observations for anthropogenically nutrient-enriched marshes worldwide, with creek-edge and bay-edge marsh evolving into mudflats and wider creeks 5 , 6 , 7 . Our work suggests that current nutrient loading rates to many coastal ecosystems have overwhelmed the capacity of marshes to remove nitrogen without deleterious effects. Projected increases in nitrogen flux to the coast, related to increased fertilizer use required to feed an expanding human population, may rapidly result in a coastal landscape with less marsh, which would reduce the capacity of coastal regions to provide important ecological and economic services.

Prokaryotic communities play key roles in biogeochemical transformation and cycling of nutrients in the productive mangrove ecosystem. In this study, the vertical distribution of rhizosphere bacteria was evaluated by profiling the bacterial diversity and community structure in the rhizospheres of four mangrove species ( Sonneratia alba , Rhizophora mucronata , Ceriops tagal and Avicennia marina ) from Mida Creek and Gazi Bay, Kenya, using DNA-metabarcoding. Alpha diversity was not significantly different between sites, but, significantly higher in the rhizospheres of S . alba and R . mucronata in Gazi Bay than in Mida Creek. Chemical parameters of the mangrove sediments significantly correlated inversely with alpha diversity metrics. The bacterial community structure was significantly differentiated by geographical location, mangrove species and sampling depth, however, differences in mangrove species and sediment chemical parameters explained more the variation in bacterial community structure. Proteobacteria (mainly Deltaproteobacteria and Gammaproteobacteria ) was the dominant phylum while the families Desulfobacteraceae , Pirellulaceae and Syntrophobacteraceae were dominant in both study sites and across all mangrove species. Constrained redundancy analysis indicated that calcium, potassium, magnesium, electrical conductivity, pH, nitrogen, sodium, carbon and salinity contributed significantly to the species–environment relationship. Predicted functional profiling using PICRUSt2 revealed that pathways for sulfur and carbon metabolism were significantly enriched in Gazi Bay than Mida Creek. Overall, the results indicate that bacterial community composition and their potential function are influenced by mangrove species and a fluctuating influx of nutrients in the mangrove ecosystems of Gazi Bay and Mida Creek.

The magnitude of stream and river carbon dioxide (CO₂) emission is affected by seasonal changes in watershed biogeochemistry and hydrology. Global estimates of this flux are, however, uncertain, relying on calculated values for CO₂ and lacking spatial accuracy or seasonal variations critical for understanding macroecosystem controls of the flux. Here, we compiled 5,910 direct measurements of fluvial CO₂ partial pressure and modeled them against watershed properties to resolve reach-scale monthly variations of the flux. The direct measurements were then combined with seasonally resolved gas transfer velocity and river surface area estimates from a recent global hydrography dataset to constrain the flux at the monthly scale. Globally, fluvial CO₂ emission varies between 112 and 209 Tg of carbon per month. The monthly flux varies much more in Arctic and northern temperate rivers than in tropical and southern temperate rivers (coefficient of variation: 46 to 95 vs. 6 to 12%). Annual fluvial CO₂ emission to terrestrial gross primary production (GPP) ratio is highly variable across regions, ranging from negligible (<0.2%) to 18%. Nonlinear regressions suggest a saturating increase in GPP and a nonsaturating, steeper increase in fluvial CO₂ emission with discharge across regions, which leads to higher percentages of GPP being shunted into rivers for evasion in wetter regions. This highlights the importance of hydrology, in particular water throughput, in routing terrestrial carbon to the atmosphere via the global drainage networks. Our results suggest the need to account for the differential hydrological responses of terrestrial–atmospheric vs. fluvial–atmospheric carbon exchanges in plumbing the terrestrial carbon budget.

Ecosystem engineers affect different organisms and processes in multiple ways at different spatial scales. Moreover, similar species may differ in their engineering effects for reasons that are not always clear. We examined the role of four species of burrowing crabs (Sesarma reticulatum, Eurytium limosum, Panopeus herbstii, Uca pugnax) in engineering tidal creek networks in salt marshes experiencing sea level rise. In the field, crab burrows were associated with heads of eroding creeks and the loss of plant (Spartina alterniflora) stems. S. reticulatum was closely associated with creek heads, but densities of the other crab species did not vary across marsh zones. In mesocosm experiments, S. reticulatum excavated the most soil and strongly reduced S. alterniflora biomass. The other three species excavated less and did not affect S. alterniflora. Creek heads with vegetation removed to simulate crab herbivory grew significantly faster than controls. Percolation rates of water into marsh sediments were 10 times faster at creek heads than on the marsh platform. Biomass decomposed two times faster at creek heads than on the marsh platform. Our results indicate that S. reticulatum increases creek growth by excavating sediments and by consuming plants, thereby increasing water flow and erosion at creek heads. Moreover, it is possible that S. reticulatum burrows also increase creek growth by increasing surface and subsurface erosion, and by increasing decomposition of organic matter at creek heads. Our results show that the interaction between crab and plant ecosystem engineers can have both positive and negative effects. At a small scale, in contrast to other marsh crabs, S. reticulatum harms rather than benefits plants, and increases erosion rather than marsh growth. At a large scale, however, S. reticulatum facilitates the drainage efficiency of the marsh through the expansion of tidal creek networks, and promotes marsh health.

The Color of the Landbrings the histories of Creek Indians, African Americans, and whites in Oklahoma together into one story that explores the way races and nations were made and remade in conflicts over who would own land, who would farm it, and who would rule it. This story disrupts expected narratives of the American past, revealing how identities--race, nation, and class--took new forms in struggles over the creation of different systems of property.Conflicts were unleashed by a series of sweeping changes: the forced \"removal\" of the Creeks from their homeland to Oklahoma in the 1830s, the transformation of the Creeks' enslaved black population into landed black Creek citizens after the Civil War, the imposition of statehood and private landownership at the turn of the twentieth century, and the entrenchment of a sharecropping economy and white supremacy in the following decades. In struggles over land, wealth, and power, Oklahomans actively defined and redefined what it meant to be Native American, African American, or white. By telling this story, David Chang contributes to the history of racial construction and nationalism as well as to southern, western, and Native American history.