Spatial and temporal distribution of butyltin compounds in a Northern Chesapeake Bay Marina and river system

1988 ◽  
Vol 10 (3) ◽  
pp. 229-244 ◽  
Author(s):  
Lenwood W. Hall ◽  
Steven J. Bushong ◽  
W. Edward Johnson ◽  
W. Scott Hall
Keyword(s):  
Chesapeake Bay ◽  
Temporal Distribution ◽  
River System ◽  
Spatial And Temporal Distribution ◽  
Butyltin Compounds

scholarly journals Datasets on spatial and temporal distribution of heavy metals concentration in recent sediment at merang river system, Terengganu, Malaysia

Data in Brief ◽  
2020 ◽  
Vol 31 ◽  
pp. 105900
Author(s):  
Nur Marni Zaini ◽  
Hui-Wen Lee ◽  
Khairul Nizam Mohamed ◽  
Asnor Azrin Sabuti ◽  
Suhaimi Suratman ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Temporal Distribution ◽  
River System ◽  
Recent Sediment ◽  
Spatial And Temporal Distribution

scholarly journals Spatial and Temporal Distribution of Two Diazotrophic Bacteria in the Chesapeake Bay

2004 ◽  
Vol 70 (4) ◽  
pp. 2186-2192 ◽  
Author(s):  
Steven M. Short ◽  
Bethany D. Jenkins ◽  
Jonathan P. Zehr
Keyword(s):  
Chesapeake Bay ◽  
Quantitative Pcr ◽  
Natural Populations ◽  
Temporal Distribution ◽  
Spatial And Temporal Distribution ◽  
Diazotrophic Bacteria ◽  
Physical Processes ◽  
Gene Copies ◽  
Pcr Assays ◽  
The Relationship

ABSTRACT The aim of this study was to initiate autecological studies on uncultivated natural populations of diazotrophic bacteria by examining the distribution of specific diazotrophs in the Chesapeake Bay. By use of quantitative PCR, the abundance of two nifH sequences (907h22 and 912h4) was quantified in water samples collected along a transect from the head to the mouth of the Chesapeake Bay during cruises in April and October 2001 and 2002. Standard curves for the quantitative PCR assays demonstrated that the relationship between gene copies and cycle threshold was linear and highly reproducible from 1 to 107 gene copies. The maximum number of 907h22 gene copies detected was approximately 140 ml−1 and the maximum number of 912h4 gene copies detected was approximately 340 ml−1. Sequence 912h4 was most abundant at the mouth of the Chesapeake Bay, and in general, its abundance increased with increasing salinity, with the highest abundances observed in April 2002. Overall, the 907h22 phylotype was most abundant at the mid-bay station. Additionally, 907h22 was most abundant in the April samples from the mid-bay and mouth of the Chesapeake Bay. Despite the fact that the Chesapeake Bay is rarely nitrogen limited, our results show that individual nitrogen-fixing bacteria have distinct nonrandom spatial and seasonal distributions in the Chesapeake Bay and are either distributed by specific physical processes or adapted to different environmental niches.

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