New and Interesting Diatoms (Bacillariophyta) from Blue Lake Warm Springs, Tooele County, Utah

FIGURES 151–154. SEM. Nitzschia vitrea. Internal valve views of three specimens. Fig. 151, Full valve showing variably spaced fibulae. Fig. 152, Tilted specimen showing striae that continue across roughly ⅔ of the valve mantle. Fig. 153, Apex with small helictoglossa and prominent fibula. Fig. 154, Central area showing elongate areolae and striae that are interrupted at the fibulae. Scale bars: Fig. 151: 20 µm; Fig. 152 µm: 10; Figs 153–154: 1 µm.Published as part of GRAEFF, C. L., KOCIOLEK, J.P. & RUSHFORTH, S.R., 2013, New and Interesting Diatoms (Bacillariophyta) from Blue Lake Warm Springs, Tooele County, Utah, pp. 1-38 in Phytotaxa 153 (1) on page 31, DOI: 10.11646/phytotaxa.153.1.1, http://zenodo.org/record/510068

FIGURES 64–69 in New and Interesting Diatoms (Bacillariophyta) from Blue Lake Warm Springs, Tooele County, Utah

FIGURES 64–69. LM. Naviculonema stagnora. Valve views showing the size diminution series. Figure 67 is the holotype. Scale bar: 10 µm.Published as part of <i>GRAEFF, C. L., KOCIOLEK, J.P. & RUSHFORTH, S.R., 2013, New and Interesting Diatoms (Bacillariophyta) from Blue Lake Warm Springs, Tooele County, Utah, pp. 1-38 in Phytotaxa 153 (1)</i> on page 14, DOI: 10.11646/phytotaxa.153.1.1, <a href="http://zenodo.org/record/5100682">http://zenodo.org/record/5100682</a&gt

FIGURES 28–32. SEM. Williamsella angusta. External views showing valves from four specimens and the cingulum. Fig. 28 in New and Interesting Diatoms (Bacillariophyta) from Blue Lake Warm Springs, Tooele County, Utah

FIGURES 28–32. SEM. Williamsella angusta. External views showing valves from four specimens and the cingulum. Fig. 28, Full valve view of a large specimen with narrow apices. Fig. 29, View showing the external opening of the rimoportula and occluded areolae. Fig. 30, An apex with no rimoportula and the structure of the areolae beneath eroded occlusions. Fig. 31, Striae at the valve center sitting between very slight transapical ribs. Fig. 32, Components of the cingulum each with a row of occluded areolae of variable size. Scale bars: Fig. 28: 10 µm; Figs 29–32: 0.5 µm.Published as part of GRAEFF, C. L., KOCIOLEK, J.P. & RUSHFORTH, S.R., 2013, New and Interesting Diatoms (Bacillariophyta) from Blue Lake Warm Springs, Tooele County, Utah, pp. 1-38 in Phytotaxa 153 (1) on page 7, DOI: 10.11646/phytotaxa.153.1.1, http://zenodo.org/record/510068

Population Dynamics and Age Relationships of 8 Tree Species in Navaho National Monument Arizona USA

This material was digitized as part of a cooperative project between the Society for Range Management and the University of Arizona Libraries.The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact [email protected] for further information.Migrated from OJS platform August 202

Nanostructure and nanomechanics of live Phaeodactylum tricornutum morphotypes.

The ultrastructure and mechanical properties of the fusiform, triradiate and ovoid morphotypes of Phaeodactylum tricornutum were investigated using atomic force microscopy. Using topographic imaging, we showed that the surface of the ovoid form is rougher than those of the two other specimens, and coated with an outer layer of extracellular polymers. Using spatially resolved force-indentation curves, we found that the valve of the ovoid form is about five times stiffer (Young modulus of approximately 500 kPa) than those of the other forms (approximately 100 kPa), a finding fully consistent with the fact that only the ovoid form has a silica valve, whereas the valves in the other two consist mostly of organic material. Notably, the girdle region of both fusiform and ovoid forms was five times softer than the valve, suggesting that this region is poor in silica and enriched in organic material. For the triradiate form, we showed the arms to be softer than the core region, presumably as a result of organelle localization. Last, we observed mucilaginous footprints of moderate stiffness (approximately 100 kPa) in the vicinity of ovoid diatoms, which we believe are secreted extracellular polymers

Random amplified polymorphic DNA analysis of the moth orchids, Phalaenopsis (Epidendroideae: Orchidaceae)

10.1007/s10681-005-4814-yEuphytica1411-211-22EUPH

Plant-herbivore interactions in streams near Mt. St. Helens

1. In four separate field experiments near Mount St Helens (Washington, U.S.A.) during 1986, the grazing effects of two large benthic herbivores, tadpoles of the tailed frog Ascaphus truei and larvae of the caddisfly Dicosmoecus gilvipes, were investigated using streamside channels and in-stream manipulations. In the experimental channels, abundances of periphyton and small benthic invertebrates declined significantly with increasing density of these larger herbivores. 2. In eleven small, high-gradient streams affected to varying degrees by the May 1980 eruption, in-stream platforms were used to reduce grazing by A, truei tadpoles on tile substrates. Single platforms erected in each tributary and compared to grazed controls revealed only minor grazing effects, and no significant differences among streams varying in disturbance intensity (and, consequently, tadpole density). However, results probably were confounded by high variability among streams in factors other than tadpole abundance. 3. Grazing effects were further examined in two unshaded streams with different tadpole densities, using five platforms per stream. In the stream with five tadpoles m−2, grazing reduced periphyton biomass by 98% and chlorophyll a by 82%. In the stream lacking tadpoles, no significant grazing effects were revealed. Low algal abundance on both platforms and controls, and high invertebrate density in that stream (c. 30000m−2) suggests that grazing by small, vagile invertebrates was approximately equivalent to that of tadpoles. 4. The influence of large benthic herbivores on algal and invertebrate communities in streams of Mount St Helens can be important, but reponses vary spatially in relation to stream disturbance history, local environmental factors, and herbivore distributional patterns and abundanc