scholarly journals Flower-visiting insects on Solidago × Niederederi (Asteraceae): an observation from a domestic garden

Botanica ◽  
2018 ◽  
Vol 24 (2) ◽  
pp. 162-171 ◽  
Author(s):  
Artur Pliszko ◽  
Kinga Kostrakiewicz-Gierałt
Keyword(s):  
Wind Speed ◽  
Air Temperature ◽  
North American ◽  
Natural Hybrid ◽  
Positive Correlation ◽  
The North ◽  
The Future ◽  
Flower Visiting

Abstract Pliszko A., Kostrakiewicz-Gierałt K., 2018: Flower-visiting insects on Solidago ×niederederi (Asteraceae): an observation from a domestic garden. - Botanica, 24(2): 162-171 In this study, we focused on flower-visiting insects on Solidago ×niederederi, a natural hybrid between the North American S. canadensis and the European S. virgaurea. Based on four-day observation in a domestic garden, we evidenced a high number of Diptera visits on hybrid flowers, per each hour of the recording, and a positive correlation between the number of insect visits and the length, the width and the number of secondary branches of synflorescence and the number of capitula. Moreover, the number of insect visits positively correlated with the air temperature and negatively correlated with the wind speed. The increasing number of insect visits with the increasing size of synflorescences suggests that capitula of the hybrid arranged in bigger panicles might be more visible and smell stronger. However, a high number of insect visits on the flowers within the same synflorescence may promote the occurrence of geitonogamy. The involvement of various insects in pollination of S. ×niederederi needs to be studied in the future.

scholarly journals “The Future of Archaeology Is Antiracist”: Archaeology in the Time of Black Lives Matter

2021 ◽  
pp. 1-20
Author(s):  
Ayana Omilade Flewellen ◽  
Justin P. Dunnavant ◽  
Alicia Odewale ◽  
Alexandra Jones ◽  
Tsione Wolde-Michael ◽  
...  
Keyword(s):  
United States ◽  
North American ◽  
The United States ◽  
Heritage Preservation ◽  
Social Unrest ◽  
Black Lives Matter ◽  
The North ◽  
Road Map ◽  
The Social ◽  
The Future

This forum builds on the discussion stimulated during an online salon in which the authors participated on June 25, 2020, entitled “Archaeology in the Time of Black Lives Matter,” and which was cosponsored by the Society of Black Archaeologists (SBA), the North American Theoretical Archaeology Group (TAG), and the Columbia Center for Archaeology. The online salon reflected on the social unrest that gripped the United States in the spring of 2020, gauged the history and conditions leading up to it, and considered its rippling throughout the disciplines of archaeology and heritage preservation. Within the forum, the authors go beyond reporting the generative conversation that took place in June by presenting a road map for an antiracist archaeology in which antiblackness is dismantled.

Negotiating North American Free Trade

2000 ◽  
Vol 5 (1) ◽  
pp. 43-68 ◽  
Author(s):  
◽  
Keyword(s):  
At Risk ◽  
Free Trade ◽  
North American ◽  
Negotiation Process ◽  
Divided Government ◽  
Weak States ◽  
Trade Negotiation ◽  
The North ◽  
The Future ◽  
Asymmetrical Power

AbstractNegotiators for powerful, self-reliant states tend to be less responsive to weak states relative to domestic constituents, while negotiators for states entangled in ties of asymmetric interdependence with more powerful states tend to be more responsive to the demands of powerful states than to the demands of domestic constituents. Asymmetrical power does not necessarily lead to asymmetrical results, however, because negotiators in weaker states may, nevertheless, have more attractive non-agreement alternatives and a longer shadow of the future. Negotiators with attractive non-agreement alternatives will be more willing to put agreement at risk by withholding concessions in the negotiation process. Centralized and vertical institutions are often a bargaining liability precisely because weak states tend to be less responsive to domestic constituents, whereas divided government can be a major asset. These propositions are demonstrated through an analysis and reconstruction of the North American Free Trade negotiation process.

The Future Structure of the North American Utility Industry

1997 ◽  
pp. 371-389
Author(s):  
Michael Weiner ◽  
Nitin Nohria ◽  
Amanda Hickman ◽  
Huard Smith
Keyword(s):  
North American ◽  
Utility Industry ◽  
The North ◽  
The Future

scholarly journals Influence of ENSO on North American subseasonal surface air temperature variability

2021 ◽  
Vol 2 (2) ◽  
pp. 395-412
Author(s):  
Patrick Martineau ◽  
Hisashi Nakamura ◽  
Yu Kosaka
Keyword(s):  
North America ◽  
Air Temperature ◽  
North American ◽  
Surface Air Temperature ◽  
Tropical Pacific ◽  
La Niña ◽  
Western North America ◽  
The North ◽  
Subseasonal Variability ◽  
La Nina

Abstract. The wintertime influence of tropical Pacific sea surface temperature (SST) variability on subseasonal variability is revisited by identifying the dominant mode of covariability between 10–60 d band-pass-filtered surface air temperature (SAT) variability over the North American continent and winter-mean SST over the tropical Pacific. We find that the El Niño–Southern Oscillation (ENSO) explains a dominant fraction of the year-to-year changes in subseasonal SAT variability that are covarying with SST and thus likely more predictable. In agreement with previous studies, we find a tendency for La Niña conditions to enhance the subseasonal SAT variability over western North America. This modulation of subseasonal variability is achieved through interactions between subseasonal eddies and La Niña-related changes in the winter-mean circulation. Specifically, eastward-propagating quasi-stationary eddies over the North Pacific are more efficient in extracting energy from the mean flow through the baroclinic conversion during La Niña. Structural changes of these eddies are crucial to enhance the efficiency of the energy conversion via amplified downgradient heat fluxes that energize subseasonal eddy thermal anomalies. The enhanced likelihood of cold extremes over western North America is associated with both an increased subseasonal SAT variability and the cold winter-mean response to La Niña.

Pentosan levels in Australian and North American feed wheats

1995 ◽  
Vol 46 (2) ◽  
pp. 389 ◽  
Author(s):  
M Wootton ◽  
L Acone ◽  
RBH Wills
Keyword(s):  
North American ◽  
Negative Relationship ◽  
Metabolizable Energy ◽  
Positive Correlation ◽  
The North ◽  
Current Thinking ◽  
Apparent Metabolizable Energy

Pentosan levels in 19 Australian and 12 North American wheats, predominantly of feed grade, were determined. Values were not significantly different between wheats from the two regions and ranged from 5.4 to 7.2% in the Australian and from 5.5 to 6.5% in the North American samples. Apparent metabolizable energy (AME) values for the Australian wheats, when used in poultry rations, showed a positive correlation with pentosan levels, which is counter to current thinking that suggests a negative relationship. These results imply that any difference between feed wheats from the two regions with respect to AME in poultry rations cannot be attributed to pentosan content.

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