scholarly journals Spatial and Temporal Dynamics of Potato Tuberworm (Lepidoptera: Gelechiidae) in the Columbia Basin of the Pacific Northwest

2010 ◽  
Vol 39 (1) ◽  
pp. 1-14 ◽  
Author(s):  
S. J. DeBano ◽  
P. B. Hamm ◽  
A. Jensen ◽  
S. I. Rondon ◽  
P. J. Landolt
Keyword(s):  
Pacific Northwest ◽  
Temporal Dynamics ◽  
Columbia Basin ◽  
Spatial And Temporal Dynamics ◽  
The Pacific ◽  
Potato Tuberworm

SPATIAL AND TEMPORAL DYNAMICS OF WOOD IN HEADWATER STREAMS OF THE PACIFIC NORTHWEST

2005 ◽  
Vol 41 (4) ◽  
pp. 899-919 ◽  
Author(s):  
Marwan A. Hassan ◽  
Dan L. Hogan ◽  
Stephen A. Bird ◽  
Christine L. May ◽  
Takashi Gomi ◽  
...  
Keyword(s):  
Pacific Northwest ◽  
Temporal Dynamics ◽  
Headwater Streams ◽  
Spatial And Temporal Dynamics ◽  
The Pacific

Building Confidence in Shell: Variations in the Marine Radiocarbon Reservoir Correction for the Northwest Coast Over the Past 3,000 Years

2004 ◽  
Vol 69 (4) ◽  
pp. 771-786 ◽  
Author(s):  
Jennie N. Deo ◽  
John O. Stone ◽  
Julie K. Stein
Keyword(s):  
Pacific Northwest ◽  
Temporal Dynamics ◽  
Puget Sound ◽  
Archaeological Sites ◽  
Calibration Curves ◽  
Spatial And Temporal Dynamics ◽  
The Pacific ◽  
Correction Curve ◽  
Age Estimates ◽  
Gulf Of Georgia

In many regions, fluctuations have occurred through time in the local 14C activity of seawater. Evaluating these shifts and their effects on 14C age estimates is difficult, and, as a result, archaeologists working in coastal settings tend to preferentially date charcoal samples over shell. Our research on 18 charcoal–shell pairs from Puget Sound and Gulf of Georgia archaeological sites helps elucidate the spatial and temporal dynamics associated with marine reservoir effects in the Pacific Northwest. This analysis suggests that between 0 and 500 B.P. the regional correction value (ΔR) is 400 years, which agrees with the modern value determined by Stuiver and others. Between 500 and 1200 B.P., however, ΔR dips close to zero, possibly reflecting a decrease in offshore upwelling. From 1200 to 3000 B.P., ΔR returns to 400 years. These data are presented as a Puget Sound/Gulf of Georgia regional correction curve for the late Holocene, which local researchers may use to calibrate dates of marine shell. In addition, we detail our methods for constructing calibration curves and present guidelines for archaeologists working in other coastal settings to develop calibration curves for their regions.

Seasonal balance and vertical pattern of photosynthetically active radiation within canopies of a tropical dry deciduous forest ecosystem in Mexico

2005 ◽  
Vol 21 (3) ◽  
pp. 283-295 ◽  
Author(s):  
Geoffrey Parker ◽  
Clara Tinoco-Ojanguren ◽  
Angelina Martínez-Yrízar ◽  
Manuel Maass
Keyword(s):  
Photosynthetically Active Radiation ◽  
Temporal Dynamics ◽  
Deciduous Forest ◽  
Canopy Structure ◽  
Tropical Deciduous Forest ◽  
Active Radiation ◽  
Spatial And Temporal Dynamics ◽  
The Pacific ◽  
Fraction Absorbed ◽  
Dry Deciduous Forest

Major components of the flux density of global photosynthetically active radiation (PAR) were measured above and within canopies in a tropical deciduous forest on the Pacific coast of Mexico. At each of 69 locations grouped along a topographic sequence the PAR reflected from the top of the canopy, the vertical profile of transmittance, and the reflectance from the ground, were measured as many as four times in the year, including the extremes of the wet and dry seasons. With these observations an annual balance of the portion of PAR radiation reflected and absorbed by the canopy and ground was assembled and the detailed spatial and temporal dynamics of PAR within canopy layers were estimated. Canopy stature declined along the topographic sequence and the shape of the transmittance profiles reflected this. In locations of declining moisture availability the fraction of PAR absorbed by the ground increased and the fraction absorbed by non-foliar tissues decreased. Seasonal variation in canopy structure was the dominant influence on the partitioning of radiation – spatial variation was less important. Of a total annual PAR input of 15 200 mol m−2, about 95% of incident PAR was absorbed, 50% by leaves, 25% by non-foliar tissues and 20% by the ground. The remaining 5% was reflected by the top of the canopy.

Assessment of undiscovered mineral resources in the Pacific Northwest: a contribution to the Interior Columbia Basin Ecosystem Management Project

1996 ◽  
Author(s):  
Stephen E. Box ◽  
Arthur A. Bookstrom ◽  
Michael L. Zientek ◽  
Pamela D. Derkey ◽  
Roger P. Ashley ◽  
...  
Keyword(s):  
Pacific Northwest ◽  
Ecosystem Management ◽  
Mineral Resources ◽  
Columbia Basin ◽  
The Pacific ◽  
Management Project

Temporal dynamics of roost snags of long-legged myotis in the Pacific Northwest, USA

2012 ◽  
Vol 76 (6) ◽  
pp. 1310-1316 ◽  
Author(s):  
Michael J. Lacki ◽  
Michael D. Baker ◽  
Joseph S. Johnson
Keyword(s):  
Pacific Northwest ◽  
Temporal Dynamics ◽  
The Pacific

scholarly journals Arbuscular Mycorrhizal Fungal Communities in Organic and Conventional Onion Crops in the Columbia Basin of the Pacific Northwest United States

2018 ◽  
Vol 2 (4) ◽  
pp. 194-207 ◽  
Author(s):  
Anne Jean’ne Knerr ◽  
David Wheeler ◽  
Dan Schlatter ◽  
Dipak Sharma-Poudyal ◽  
Lindsey J. du Toit ◽  
...  
Keyword(s):  
Pacific Northwest ◽  
Mycorrhizal Fungi ◽  
Root Colonization ◽  
Arbuscular Mycorrhizal ◽  
Columbia Basin ◽  
Metam Sodium ◽  
Operational Taxonomic Units ◽  
Amf Diversity ◽  
The Pacific ◽  
Amf Communities

Onions are highly responsive to arbuscular mycorrhizal fungi (AMF), but little is known about AMF communities in onion crops (∼10,000 ha) in the semiarid, irrigated region of the Columbia Basin of Washington and Oregon. AMF communities and root colonization were compared in organic and conventional onion fields, and between paired conventional fields that were fumigated or not with metam sodium. AMF were detected in all fields at all sampling times, with no differences in root colonization of onions used to bait soil from organic versus conventional and fumigated versus nonfumigated fields. However, AMF colonization of roots of onion plants sampled midsummer was greater in organic versus conventional fields (67 versus 51%) and less in fumigated versus nonfumigated conventional fields (45 versus 67%). Pyrosequencing identified four AMF genera (Glomus, Claroideoglomus, Paraglomus, and Diversispora) and four dominant operational taxonomic units (OTUs) (Glomus mosseae (Funneliformis mosseae), Glomus Whitfield type 17, Claroideoglomus lamellosum, and Glomus MO_G17). AMF community structure in roots of onion plants collected from crops midsummer was different in organic versus conventional crops, with greater AMF diversity and richness in organic than conventional crops. There was no effect of organic versus conventional crops on dominant OTUs, but several low-abundance OTUs in organic fields were not detected in conventional fields. There was no consistent effect of metam sodium chemigation on AMF communities in onion crops. Overall, cropping practices in organic versus conventional onion production, and the use of metam sodium soil fumigation by center-pivot chemigation do not appear to be major drivers of AMF communities.

First Report of Powdery Mildew of Onion (Allium cepa) Caused by Leveillula taurica in the Pacific Northwest

2004 ◽  
Vol 5 (1) ◽  
pp. 17 ◽  
Author(s):  
Lindsey J. du Toit ◽  
Dean A. Glawe ◽  
Gary Q. Pelter
Keyword(s):  
Powdery Mildew ◽  
Pacific Northwest ◽  
Allium Cepa ◽  
Washington State ◽  
Causal Agent ◽  
Columbia Basin ◽  
First Report ◽  
Leveillula Taurica ◽  
The Pacific ◽  
Published Report

A powdery mildew disease of onion has been observed infrequently in the Columbia Basin of Washington State since 1996, but this is the first published report of this disease in the Pacific Northwest. The causal agent was determined to be Leveillula taurica (Lév.) G. Arnaud. Accepted for publication 29 October 2004. Published 29 November 2004.

scholarly journals Ecosystem fluxes of carbonyl sulfide in an old-growth forest: temporal dynamics and responses to diffuse radiation and heat waves

2018 ◽  
Vol 15 (23) ◽  
pp. 7127-7139 ◽  
Author(s):  
Bharat Rastogi ◽  
Max Berkelhammer ◽  
Sonia Wharton ◽  
Mary E. Whelan ◽  
Frederick C. Meinzer ◽  
...  
Keyword(s):  
Pacific Northwest ◽  
Temporal Dynamics ◽  
Heat Waves ◽  
Carbonyl Sulfide ◽  
Diffuse Radiation ◽  
Field Studies ◽  
Old Growth ◽  
Old Growth Forest ◽  
The Pacific ◽  
The Us

Abstract. Carbonyl sulfide (OCS) has recently emerged as a tracer for terrestrial carbon uptake. While physiological studies relating OCS fluxes to leaf stomatal dynamics have been established at leaf and branch scales and incorporated into global carbon cycle models, the quantity of data from ecosystem-scale field studies remains limited. In this study, we employ established theoretical relationships to infer ecosystem-scale plant OCS uptake from mixing ratio measurements. OCS fluxes showed a pronounced diurnal cycle, with maximum uptake at midday. OCS uptake was found to scale with independent measurements of CO2 fluxes over a 60 m tall old-growth forest in the Pacific Northwest of the US (45∘49′13.76′′ N, 121∘57′06.88′′ W) at daily and monthly timescales under mid–high light conditions across the growing season in 2015. OCS fluxes were strongly influenced by the fraction of downwelling diffuse light. Finally, we examine the effect of sequential heat waves on fluxes of OCS, CO2, and H2O. Our results bolster previous evidence that ecosystem OCS uptake is strongly related to stomatal dynamics, and measuring this gas improves constraints on estimating photosynthetic rates at the ecosystem scale.

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