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openOpenFeb 1998View details →

Seasonal patterns of nitrogen fixation by Alnus tenuifolia within successional floodplain forests of the Bonaza Creek Experimantal Forest: 1992

Nitrogenase activity was measured by acetylene reduction (Stewart et al. 1967) and denitrification activity was measured by the acetylene inhibition technique (Tiedje 1982). Both processes were measured simultaneously on the same alder root/nodule sample and on bulk soil samples that served as controls. We sampled all sites in the 1992 growing season; during 7-9 July, 10-14 August, and 6-11 September.

openOpenApr 2016View details →

Ground Water Depth Readings at BCEF/LTER Floodplain Sites, 1991-Present: Weekly

Ground water depth readings were collected at BCEF/LTER floodplain sites beginning in 1991. Wells were visited and measured weekly during the growing season.

openOpenFeb 2012View details →

Ground Water Depth Readings at BCEF/LTER Floodplain Sites, 1991-Present: Hourly

Campbell CR7 dataloggers were used at FP1A, FP2A, and FP4A to measure ground water and river levels (river levels only at FP4A) during the summer growing season. Each site has four wells being monitored and any river levels are in addition to these wells. A Druk Inc. sensor (model PDRC 10/D) was placed at the bottom of the 3 meter by 15 cm PVC well tubes and calibrated to output depth from forest floor to groundwater. Sensors are scanned every 5 minutes and hourly averages are output to a storage module.

Summary of environmental and stand characteristics of thinleaf alder sites along the Tanana River floodplains from 2006-2007.

This dataset contains a summary of environmental and stand characteristics of thinleaf alder dominated along the Tanana River floodplains. Environmental data for each site include terrace height, total thickness of organic layers, depth of uppermost organic layer, soil pH, soil C, N, and P, and soil N/P ratio. Also included are mean thinleaf alder foliar C, N, and P concentrations and foliar N/P ratio for a sumbsample of sites. Estimates of stand age, based on the age of the oldest alder, are available for a subsample of sites. Other stand characteristics include canopy cover, stem density and basal area of thinleaf alder, willows, balsam poplar, and white spruce, and % of alder stems infected with a fungal stem canker at various degrees of disease severity.

Stem diameter of trees and shrubs in thinleaf alder sites along the Tanana River floodplains and severity of stem canker infection of alder in 2006.

This dataset includes the stem diameter of each woody plant >2m tall, by species (or genus), found in each of the thinleaf alder sites we established in the Tanana River floodplains in 2006, as well as an assessment of the severity of canker infection in each thinleaf alder stem. Species (or genus), diameter at breast height (dbh), and severity of canker infection are the variables included here. This dataset can be used in conjunction with a dataset of alder size/age relationships (DN_alder_stand_structure2.xls) to estimate the age structure of alder stands.

Age, size, and disease severity of thinleaf alder stems along the Tanana River floodplains, collected in 2006 and 2007.

Thinleaf alder stands on the Tanana River floodplains, sampled in 2006 and 2007: A subsample of thinleaf alder stems were aged using tree-ring analysis, and the age structures of alder populations were estimated from their size structures (DN_alder_stand_structure1), based on the size/age relationships derived from this dataset. Relationships between disease incidence/severity and size/age were also explored. Included in this dataset are: the stem diameter at breast height (dbh), age of stem at ground level, age at breast height, and disease severity.

Summary of plant community structure of thinleaf alder sites along the Tanana River floodplains from 2006.

This dataset contains a summary of plant species composition and abundance data from thinleaf alder sites along the Tanana River floodplains in 2006. This includes stem counts by species (or genus) for all woody plants less then 2m in height (both separated by dbh size class and combined), stem counts by species for all woody plants greater then 2m in height, percent cover of each forb and graminoid species, mosses, and lichens, and percent of bare ground. The presence or absence of moose and snowshoe hare feces are also indicated.

Standardized ring-width chronologies of thinleaf alder growth along the Tanana River floodplains spanning 1968-2006.

This dataset contains landscape level and site level standardized ring-width chronologies (1968-2006) of thinleaf alder growth along the Tanana River floodplains. The raw tree ring-width series from each alder disk was individually detrended to remove age-related growth trends. The chronologies represent the high-frequency variation in ring-width to be analyzed at the inter-annual time scale.

openOpenNov 2009View details →

White Spruce NPP: Tree density and basal area by diameter sizeclass in upland and floodplain mid- and late-successional stands: 1989-2008

This data set is derived from BNZ LTER inventory plots. Stand density and basal area are listed by diameter size class of live white spruce trees for each replicate stand within mid-successional and mature white spruce stands within both floodplain and upland landscapes by year from 1989-2008.

openOpenOct 2002View details →

del 15N Values for Tanana River Floodplain Soils and Xylem Sap Samples

Because soil microoorganisms preferencially discriminate either for or against heavy nitrogen isotopes in organic compounds we can learn something about the route these compounds take through any given system by looking at the isotopic ratio of heavy to light nitrogen within a pool as compared to the ratio for the system as a whole. An enriched pool means that 15N has been discriminated for, while a depleted pool means 15N has been discriminated against. By determining the del 15N values for soil protein, amino acids, ammonium, the soil microbial population, and plant roots and xylem we can learn something about where plants are deriving there nitrogen nutrition.

opencc-by-4.0Nov 2018View details →

Fig. 1 in Divergence in energy sources for Prochilodus lineatus (Characiformes: Prochilodontidae) in Neotropical floodplains

Fig. 1. Map of the floodplain of the Upper Paraná River, highlighting the areas sampled in this study. The subsystems sampled were A = Paraná River, B = Baía River and C = Ivinheima River. The numbers indicate sampled sites in each subsystem.

opencc-by-4.0Nov 2018View details →

Fig. 4 in Divergence in energy sources for Prochilodus lineatus (Characiformes: Prochilodontidae) in Neotropical floodplains

Fig. 4. The average percentage contribution of each carbon source in different subsystems. The width of arrows represents the strength of resource utilization in each environment studied (MB = microbial biomass).

Fig. 12. Tatia musaica, MBUCV V-15663, 47.1 in A new Centromochlus Kner, 1858 (Siluriformes: Auchenipteridae: Centromochlinae) from the transition between Amazon floodplain and Guiana shield, Brazil

Fig. 12. Tatia musaica, MBUCV V-15663, 47.1 mm SL, morphologically similar centromochlin species from the Guiana Shield in Amazonas, Venezuela. Photo by C. DoNascimiento and N. Milani. Copyright© F. Provenzano and Museo de Biologia de la Universidad Central de Venezuela. Available at http://acsi.acnatsci.org/

Fig. 11 in A new Centromochlus Kner, 1858 (Siluriformes: Auchenipteridae: Centromochlinae) from the transition between Amazon floodplain and Guiana shield, Brazil

Fig. 11. Igarapé Jamari, type locality of Centromochlus orca, rio Nhamundá basin, middle Amazonas basin, municipality of Terra Santa, Pará State, Brazil. Photo by H. Lazzarotto.

Fig. 7 in A new Centromochlus Kner, 1858 (Siluriformes: Auchenipteridae: Centromochlinae) from the transition between Amazon floodplain and Guiana shield, Brazil

Fig. 7. Pharyngeal arches of Centromochlus orca, INPA 35086, paratype, 54.1 mm SL. Dorsal view. Abbreviations: bb2-4, basibranchials 2 to 4 (anterior to posterior); cb1- 5, ceratobranchials 1 to 5 (anterior to posterior); eb1- 4, epibranchials 1 to 4 (anterior to posterior); hb1-3, hypobranchials 1 to 3; pb3, pharingobranchial 3; pb4, pharingobranchial 4. Scale bar = 1 mm.

Fig. 5 in A new Centromochlus Kner, 1858 (Siluriformes: Auchenipteridae: Centromochlinae) from the transition between Amazon floodplain and Guiana shield, Brazil

Fig. 5. Anterior vertebrae and associated bones, ventral view, of a. Centromochlus orca, INPA 35086, paratype, 54.1 mm SL. b. Tatia melanoleuca, MZUSP 30585, 53.0 mm SL. c. Centromochlus heckelii, MZUSP 8336, 62.0 mm SL. Abbreviations: n3, posterior nuchal plate, boc, basioccipital, cv, complex vertebra, Pv4, parapophysis of fourth vertebra, Pv5, parapophysis of fifth vertebra, Pv6, parapophysis of sixth vertebra, os, os suspensorium, rib, precaudal rib, scl, trans-scapular process of posttemporal-supracleithrum, tr, tripus. Scale bar = 1 mm.

Fig. 6 in A new Centromochlus Kner, 1858 (Siluriformes: Auchenipteridae: Centromochlinae) from the transition between Amazon floodplain and Guiana shield, Brazil

Fig. 6. Right hyoid arch of Centromochlus orca, INPA 35086, paratype, 54.1 mm SL. Ventral view. Abbreviations: ac, anterior ceratohyal; br, branchiostegal rays; dh, dorsal hypohyal; ih, interhyal; pc, posterior ceratohyal; vh, ventral hypohyal; uh, urohyal; up, urohyal ventral process. Scale bar = 1 mm.

Fig. 4 in A new Centromochlus Kner, 1858 (Siluriformes: Auchenipteridae: Centromochlinae) from the transition between Amazon floodplain and Guiana shield, Brazil

Fig. 4. Right suspensorium, lateral view, of a. Centromochlus orca, INPA 35086, paratype, 54.1 mm SL. b. Tatia musaica, MBUCV-V 17727, paratype, 24.3 mm SL. Abbreviations: aa, angulo-articular; dn, dentary; hm, hyomandibula; io, interopercle; mt, metapterygoid; en, endopterygoid; op, opercle; po, preopercle; qu, quadrate; sb, subpreopercle; sp, suprapreopercle. Scale bar = 1 mm.

Fig. 3 in A new Centromochlus Kner, 1858 (Siluriformes: Auchenipteridae: Centromochlinae) from the transition between Amazon floodplain and Guiana shield, Brazil

Fig. 3. Head in lateral view of a cleared and stained specimen of Centromochlus orca, MBML 11221, 50.6 mm SL. Photo by L. Sarmento-Soares. Abbreviations: bmx, maxillary barbel; io1, first infraorbital; io5, posterior ossified infraorbital; mx, maxilla; pmx, premaxilla; sph, sphenotic.

Fig. 2 in A new Centromochlus Kner, 1858 (Siluriformes: Auchenipteridae: Centromochlinae) from the transition between Amazon floodplain and Guiana shield, Brazil

Fig. 2. Neurocranium of Centromochlus orca, INPA 35086, paratype, 54.1 mm SL. Dorsal view. Abbreviations: Dsp, dorsal fin spinelet; Epo, epiotic; Epop, epiotic process; Fro, frontal; io1, first infraorbital; io5, posterior ossified infraorbital; Le, lateral ethmoid; Mes, mesethmoid; Nas, nasal; Np2, middle nuchal plate; Np3, posterior nuchal plate; Pto, pterotic; Scl, posttemporal-supracleitrum; Soc, parieto-supraoccipital; Sop, suprapreopercle; Sph, sphenotic. Scale bar =1 mm.