1,585 research outputs found
Oral history interview with Ron Schaefer
No full textRonald Schaefer, a 1972 graduate of Oklahoma State University, recalls his youth in Marshall, Oklahoma, the hometown of Dr. Angie Debo, historian and author who focused on the mistreatment of Native Americans throughout history. He shares memories and history of Marshall, as well as his memories of Dr. Debo, reading personal notes that she wrote to him and his family, and sharing details of personal conversations. He also reminisced about her effect on those around her.The Remembering Angie Debo Collection is a series of interviews conducted with friends and supporters of Angie Debo, an American historian
Nutrient release from decomposing leaf litter of temperate deciduous forest trees along a gradient of increasing tree species diversity
No full textJacob M, Weland N, Platner C, Schaefer M, Leuschner C, Thomas FM. Nutrient release from decomposing leaf litter of temperate deciduous forest trees along a gradient of increasing tree species diversity. SOIL BIOLOGY & BIOCHEMISTRY. 2009;41(10):2122-2130.In the litter of six deciduous tree species (Fagus sylvatica, Tilia spp., Fraxinus excelsior, Carpinus betulus, Acer pseudoplatanus and Acer platanoides) and in stand-specific litter mixtures, we compared mass loss and nutrient release across diversity levels along a gradient of decreasing proportion of Fagus in stands with similar environmental and physical soil conditions. The litterbag studies ran over 22 months. The decomposition rate constants (k) of the temperate forest species ranged from k = 0.5 for Fagus to k = 1.5-2 for all other tree species. In Fagus, k was closely negatively correlated with the thickness of the litter layer and positively correlated with soil pH and isopod abundance. k was significantly higher in the mixed species stands (except for Carpinus and Fraxinus) and was positively correlated with earthworm abundance. Over the whole incubation time, nutrient amount and release rates of N, P, K, Ca and Mg as well as C-related ratios showed significant differences between tree species but no consistent differences among the diversity levels. Initial C-related nutrient ratios of the leaf litter and abundance of mesofauna and macrofauna were correlated with the length of time lag before nutrient release. We conclude that the mere number of tree species is not the main driver of nutrient release and decomposition processes, but that key groups of the decomposer fauna as well as the characteristic traits of the individual tree species are decisive. (C) 2009 Elsevier Ltd. All rights reserved
Annotated checklist of the freshwater fishes of continental and insular Honduras
No full textMatamoros, Wilfredo A., Schaefer, Jacob F., Kreiser, Brian R. (2009): Annotated checklist of the freshwater fishes of continental and insular Honduras. Zootaxa 2307: 1-38, DOI: 10.5281/zenodo.27540
Schaefer, Jacob: A Brief History of the Combination of Cross Polarization and Magic Angle Spinning
No full textElopiformes
No full textELOPIFORMES Megalopidae. Peripheral. Megalops atlanticus Valenciennes, 1847. Tarpon, sábalo. Native. Departments: Atlántida, Colón and Gracias a Dios. Drainages: Atlantic slope: Cangrejal, Aguán, Plátano and Patuca.Published as part of Matamoros, Wilfredo A., Schaefer, Jacob F. & Kreiser, Brian R., 2009, Annotated checklist of the freshwater fishes of continental and insular Honduras, pp. 1-38 in Zootaxa 2307 on page 7, DOI: 10.5281/zenodo.27540
Schaefer home photograph
No full textPhotograph of a house identified as the Schaefer home on Oakland Park Avenue in Clintonville. The children are identified as "Jakie" (Jacob) and Frances. This image was included in a "Memory Book" compiled by Mrs. H. V. Cottrell, historian for the Clinton League (sometimes called the Clinton Welfare League) from 1938-1943. The book shows the development of the Clintonville neighborhood of Columbus, Ohio, between 1912 and 1938, and records the history of the League. The Clinton League was a women's group founded in 1912 to promote child welfare and later general welfare in Columbus, but which was based in and primarily focused on the area of Clintonville
FIGURE 2 in Annotated checklist of the freshwater fishes of continental and insular Honduras
No full textFIGURE 2. Map of Honduras showing 19 major Honduran river drainage basins. Shaded areas depict drainages located on the Pacific slope; unshaded areas are on the Atlantic Slope.Published as part of Matamoros, Wilfredo A., Schaefer, Jacob F. & Kreiser, Brian R., 2009, Annotated checklist of the freshwater fishes of continental and insular Honduras, pp. 1-38 in Zootaxa 2307 on page 6, DOI: 10.5281/zenodo.27540
Batrachoidiformes
No full textBATRACHOIDIFORMES Batrachoididae. Peripheral. Batrachoides gilberti Meek & Hildebrand, 1928. Large-eye toadfish, sapo ojón. Native. Department: Gracias a Dios. Drainage: Atlantic slope: Patuca Remarks: The following five vouchers collected in Brus Laguna represent the first report of B. gilberti in Honduras: FMNH 84545-84549.Published as part of Matamoros, Wilfredo A., Schaefer, Jacob F. & Kreiser, Brian R., 2009, Annotated checklist of the freshwater fishes of continental and insular Honduras, pp. 1-38 in Zootaxa 2307 on page 11, DOI: 10.5281/zenodo.27540
Perciformes
No full textGOBIESOCIFORMES Gobiesocidae. Peripheral. Gobiesox strumosus Cope, 1870. Skilletfish, cazoleta. Native. Department: Cortés. Drainage: Atlantic slope: Chamelecón. Remarks: The following two vouchers collected in the Cieneguita River (GCRL 4446) and the Tulián River (GCRL 4459) represents the first report of G. strumosus in Honduras.Published as part of Matamoros, Wilfredo A., Schaefer, Jacob F. & Kreiser, Brian R., 2009, Annotated checklist of the freshwater fishes of continental and insular Honduras, pp. 1-38 in Zootaxa 2307 on page 11, DOI: 10.5281/zenodo.27540
Tree species diversity versus tree species identity: Driving forces in structuring forest food webs as indicated by soil nematodes
No full textPositive relationships between biodiversity and ecosystem functioning are reported in many studies. The underlying mechanisms are, however, only little understood, likely due to the focus on the aboveground system and neglecting species-specific traits. We used different clusters of tree species composition to investigate how tree species diversity and tree species identity affect belowground nematode communities. Since soil nematodes comprise different trophic groups and are strongly linked to the microbial community, results can provide insight on how soil food webs are structured. In addition, data on leaf litter and fine root biomass were included to account for different effects of aboveground and belowground resources. Clusters of three trees of one, two and three species were identified within a temperate deciduous forest. Target tree species were European beech (Fagus sylvatica), common ash (Fraxinus excelsior) and lime (Tilia cordata, T. platyphyllos) differing in physiology, leaf litter quality and type of mycorrhiza. Tree species identity strongly affected nematode trophic structure, whereas tree Species diversity had no impact. Ash beneficially affected bacterial-feeding nematodes, whereas fungal feeders were suppressed, likely caused by ash litter increasing soil pH. Fostering of the bacterial food chain by ash additionally could be related to rhizodeposition gaining importance after disappearance of high quality ash litter in spring, highlighting seasonal shifts in root and leaf litter-derived resources. The negative effect of ash on fungal-feeding nematodes is suggested to be due to the lack of ectomycorrhizal fungi as ash roots only form arbuscular mycorrhiza. In contrast, beech benefited fungal feeders and detrimentally affected bacterial feeders due to more acidic soil conditions that increase the competitive strength of fungi. Lime tended to negatively impact total nematode density but positively influenced plant-feeding nematodes. Generally, beech and ash strongly but opposingly influenced the trophic structure of nematode communities suggesting that changes in tree species identity result in major shifts in the channeling of energy through decomposer food webs. The results indicate that the structure of soil food webs varies markedly with tree species and point to the importance of basal resources, i.e., leaf litter and rhizodeposits. This suggests bottom-up forces mediated by individual tree species to control major decomposition pathways rather than tree diversity. (C) 2013 Elsevier Ltd. All rights reserved
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