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485 results on '"Palmer, Michael W."'

153. Letters to the Editor

Author

Palmer, Michael W., Loehle, Craig, Frenzen, Peter, Kelly, Mahlon G., and Miller, Richard S.

Published
1988

155. Environment determinants of and impact on childhood asthma by the bacterial community in household dust

Author

Maier, Raina M., Palmer, Michael W., Andersen, Gary L., Halonen, Marilyn J., Josephson, Karen C., Maier, Robert S., Martinez, Fernando D., Neilson, Julia W., Stern, Debra A., Vercelli, Donata, and Wright, Anne L.

Subjects
Bacterial toxins -- Research, Asthma in children -- Causes of, Asthma in children -- Environmental aspects, Dust -- Health aspects, Immune response -- Analysis, Polymerase chain reaction -- Usage, Biological sciences
Abstract

PCR-denaturing gradient gel analysis was used to evaluate the effects of environmental exposures typically associated with asthma protection or risk on the microbial community structure of household dust. The findings indicated that specific bacterial populations within the bacterial community structure are associated with either risk or protection from asthma.

Published
2010

159. Incorporating spatial autocorrelation in rarefaction methods: Implications for ecologists and conservation biologists

Author

Bacaro, Giovanni, primary, Altobelli, Alfredo, additional, Cameletti, Michela, additional, Ciccarelli, Daniela, additional, Martellos, Stefano, additional, Palmer, Michael W., additional, Ricotta, Carlo, additional, Rocchini, Duccio, additional, Scheiner, Samuel M., additional, Tordoni, Enrico, additional, and Chiarucci, Alessandro, additional

Published
2016
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163. First North American Records of Porphyrosela minuta Clarke (Lepidoptera: Gracillariidae), with Notes on its Native Congener, P. desmodiella (Clemens).

Author

Eiseman, Charles S., Feldman, Tracy S., Lopresti, Eric F., and Palmer, Michael W.

Abstract

The South American moth Porphyrosela minuta Clarke (Gracillariidae) is documented for the first time in the United States, where it is already widespread. The larvae are leafminers of white clover ( Trifolium repens L., Fabaceae). Adults and larval habits are compared with those of the native Nearctic P. desmodiella (Clemens), which mines leaves of several other legumes.We summarize and add to the known distribution and parasitoid records for both species. [ABSTRACT FROM AUTHOR]

Published
2017
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169. How much and at what scale? Multiscale analyses as decision support for conservation of saproxylic oak beetles

Author

Bergman, Karl-Olof, Jansson, Nicklas, Claesson, Kenneth, Palmer, Michael W., Milberg, Per, Bergman, Karl-Olof, Jansson, Nicklas, Claesson, Kenneth, Palmer, Michael W., and Milberg, Per

Abstract

A key aspect for understanding species distributions is how they respond to habitat factors at different spatial scales. In this study we used a dataset mapping 33,000 large/hollow oaks, habitat for a guild of saproxylic beetles specialised on oaks at an extent of 10,000 km2. A total of 16 oak-dependent saproxylic species, out of 35, showed a clear relationship with substrate density at scales ranging from 52 m to ⩾5200 m. The characteristic scale of response for species richness of oak specialist species was 2284 m. At this scale, there was a tendency for richness to plateau at about 0.15 oaks ha−1, in which case about 250 hollow or large (circumference 310 cm) oaks would be needed in an area of 1600 ha to ensure a rich saproxylic oak fauna. The main general conclusions were: (i) a multi-scale approach is especially valuable to identify the characteristic scale of response; and that assuming a joint, single scale for all species may result in very poor decision support. (ii) The variation in species’ responses to substrate density at different scales means that habitat loss and fragmentation as well as management and restoration may have very different effects upon different species. (iii) Some species respond both to local and landscape scales, indicating that species occurrences in fragmented oak landscapes are affected both by short-term dynamics of the beetles and long term dynamics of the oak substrate. (iv) Maps, useful as decision support, can be constructed based on resource availability (in our case oak density) and characteristic scales.

Published
2012
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170. Changes in the distributions of epiphytic lichens in southern Sweden using a new statistical method

Author

Lättman, Håkan, Milberg, Per, Palmer, Michael W, Mattsson, Jan-Eric, Lättman, Håkan, Milberg, Per, Palmer, Michael W, and Mattsson, Jan-Eric

Abstract

Past studies on changes in species distribution have mainly been based on analysis of range boundaries. In contrast, the method used here evaluates shifts in species geographic centroids within a predefined area. We used presence/absence data on epiphytic lichens collected 1986 and 2003 from 64 sites in southern Sweden. A centroid was calculated each year, for each lichen species and substrate. The distance of centroid movement was evaluated in a permutation procedure. In total, 56 lichen species on 22 tree species were involved in the analyses, yielding 30 cases that had sufficient sample sizes both years to be evaluated. Out of these, three exhibited a significant movement of their centroid. The shift of lichen centroids of Hypogymnia physodes (L.) Nyl. and Vulpicida pinastri (Scop.) J.-E. Mattsson andamp; M. J. Lai on the tree species Juniperus communis L. was 50 and 151 km with the direction 27 degrees and 48 degrees, respectively. For Hypogymnia physodes on Pinus sylvestris L., corresponding values were 41 km and 30 degrees. The northnortheast shifts of these species in Sweden could be a response to a warming climate.

Published
2009
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185. Plant Virus Biodiversity and Ecology

Author

Wren, Jonathan D, primary, Roossinck, Marilyn J, additional, Nelson, Richard S, additional, Scheets, Kay, additional, Palmer, Michael W, additional, and Melcher, Ulrich, additional

Published
2006
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198. Silicon-vegetation interaction in multiple ecosystems: a review.

Author

Schoelynck, Jonas, Müller, Frauke, Vandevenne, Floor, Bal, Kris, Barão, Lúcia, Smis, Adriaan, Opdekamp, Wout, Meire, Patrick, Struyf, Eric, and Palmer, Michael W.

Subjects
CARBON sequestration, LAND use, AGRICULTURAL development, BIOTIC communities, PLANT physiology, MOUNTAINS, ECOSYSTEMS, WETLANDS
Abstract

Question How does the interaction between silicon ( Si) and vegetation affect local and global ecological processes, higher levels of ecological organization, and terrestrial- and watershed-scale Si fluxes? Location We selected several ecosystems throughout the world, from river headwaters to estuaries, being examples of (i) terrestrial vegetation, (ii) aquatic and floodplain vegetation, and (iii) tidal wetland vegetation. Methods We provide examples of the importance of linking Si use by terrestrial and aquatic vegetation, to larger-scale Si flux consequences towards and through rivers. Cross-disciplinary studies achieve the best understanding of vegetation effects on the global Si cycle, and the role of Si as a plant functional trait. Conclusion Si use by plants has not always received the research attention of other elements. Yet, today the importance of Si for plant functioning is slowly becoming better understood. Silicon is a crucial element for many plant species, being important for decomposition processes, plant competitiveness and stress tolerance. The inclusion by vegetation scientists of Si uptake as a plant functional trait is important to assess links between plant physiology, plant distribution and plant tolerance to environmental changes, but also to understand the role of vegetation on Si fluxes through the watershed. However, lack of knowledge regarding the biological control of the Si cycle hinders accurate quantification. Only a concerted effort bringing scientists together from a broad array of disciplines will provide this new direction for research on vegetation- Si cycling. [ABSTRACT FROM AUTHOR]

Published
2014
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