Regression tree threshold values, uncertainty estimates, and P -values for phytoplankton production and bacterial production

Table 5. Regression tree threshold values, uncertainty estimates, and P -values for phytoplankton production and bacterial production. Abstract We compared planktonic primary and secondary production across twenty meltwater ponds on the surface of the McMurdo Ice Shelf in January 2007, including som...

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Main Authors: Sorrell, Brian K, Hawes, Ian, Safi, Karl
Format: Dataset
Language:unknown
Published: IOP Publishing 2013
Subjects:
Online Access:https://dx.doi.org/10.6084/m9.figshare.1011891
https://iop.figshare.com/articles/dataset/___Regression_tree_threshold_values_uncertainty_estimates_and_em_P_em_values_for_phytoplankton_produ/1011891
id ftdatacite:10.6084/m9.figshare.1011891
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spelling ftdatacite:10.6084/m9.figshare.1011891 2023-05-15T16:41:55+02:00 Regression tree threshold values, uncertainty estimates, and P -values for phytoplankton production and bacterial production Sorrell, Brian K Hawes, Ian Safi, Karl 2013 https://dx.doi.org/10.6084/m9.figshare.1011891 https://iop.figshare.com/articles/dataset/___Regression_tree_threshold_values_uncertainty_estimates_and_em_P_em_values_for_phytoplankton_produ/1011891 unknown IOP Publishing Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Environmental Science dataset Dataset 2013 ftdatacite https://doi.org/10.6084/m9.figshare.1011891 2021-11-05T12:55:41Z Table 5. Regression tree threshold values, uncertainty estimates, and P -values for phytoplankton production and bacterial production. Abstract We compared planktonic primary and secondary production across twenty meltwater ponds on the surface of the McMurdo Ice Shelf in January 2007, including some ponds with basal brines created by meromictic stratification. Primary production ranged from 1.07 to 65.72 mgC m −3 h −1 in surface waters. In stratified ponds primary production was always more than ten times higher in basal brines than in the corresponding mixolimnion. Regression tree analysis ( r 2 = 0.80) identified inorganic nitrogen (as {\mathrm{NH}}_{4}^{+}) as the main factor limiting planktonic primary production. However, there was also evidence of inorganic carbon co-limitation of photosynthesis in some of the more oligotrophic waters. Neither C nor N limited carbon fixation at [NH 4 –N] > 50 mg m −3 , with photoinhibition the factor most likely limiting photosynthesis under such conditions. Primary production was the only factor significantly correlated to bacterial production and the relationship ( r 2 = 0.56) was non-linear. Nitrogen limitation and tight coupling of planktonic primary and bacterial production is surprising in these ponds, as all have large pools of dissolved organic carbon (1.2–260 g m −3 ) and organic nitrogen (all >130 mg m −3 ). The dissolved pools of organic carbon and nitrogen appear to be recalcitrant and bacterial production to be constrained by limited release of labile organics from phytoplankton. Dataset Ice Shelf McMurdo Ice Shelf DataCite Metadata Store (German National Library of Science and Technology) McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000)
institution Open Polar
collection DataCite Metadata Store (German National Library of Science and Technology)
op_collection_id ftdatacite
language unknown
topic Environmental Science
spellingShingle Environmental Science
Sorrell, Brian K
Hawes, Ian
Safi, Karl
Regression tree threshold values, uncertainty estimates, and P -values for phytoplankton production and bacterial production
topic_facet Environmental Science
description Table 5. Regression tree threshold values, uncertainty estimates, and P -values for phytoplankton production and bacterial production. Abstract We compared planktonic primary and secondary production across twenty meltwater ponds on the surface of the McMurdo Ice Shelf in January 2007, including some ponds with basal brines created by meromictic stratification. Primary production ranged from 1.07 to 65.72 mgC m −3 h −1 in surface waters. In stratified ponds primary production was always more than ten times higher in basal brines than in the corresponding mixolimnion. Regression tree analysis ( r 2 = 0.80) identified inorganic nitrogen (as {\mathrm{NH}}_{4}^{+}) as the main factor limiting planktonic primary production. However, there was also evidence of inorganic carbon co-limitation of photosynthesis in some of the more oligotrophic waters. Neither C nor N limited carbon fixation at [NH 4 –N] > 50 mg m −3 , with photoinhibition the factor most likely limiting photosynthesis under such conditions. Primary production was the only factor significantly correlated to bacterial production and the relationship ( r 2 = 0.56) was non-linear. Nitrogen limitation and tight coupling of planktonic primary and bacterial production is surprising in these ponds, as all have large pools of dissolved organic carbon (1.2–260 g m −3 ) and organic nitrogen (all >130 mg m −3 ). The dissolved pools of organic carbon and nitrogen appear to be recalcitrant and bacterial production to be constrained by limited release of labile organics from phytoplankton.
format Dataset
author Sorrell, Brian K
Hawes, Ian
Safi, Karl
author_facet Sorrell, Brian K
Hawes, Ian
Safi, Karl
author_sort Sorrell, Brian K
title Regression tree threshold values, uncertainty estimates, and P -values for phytoplankton production and bacterial production
title_short Regression tree threshold values, uncertainty estimates, and P -values for phytoplankton production and bacterial production
title_full Regression tree threshold values, uncertainty estimates, and P -values for phytoplankton production and bacterial production
title_fullStr Regression tree threshold values, uncertainty estimates, and P -values for phytoplankton production and bacterial production
title_full_unstemmed Regression tree threshold values, uncertainty estimates, and P -values for phytoplankton production and bacterial production
title_sort regression tree threshold values, uncertainty estimates, and p -values for phytoplankton production and bacterial production
publisher IOP Publishing
publishDate 2013
url https://dx.doi.org/10.6084/m9.figshare.1011891
https://iop.figshare.com/articles/dataset/___Regression_tree_threshold_values_uncertainty_estimates_and_em_P_em_values_for_phytoplankton_produ/1011891
long_lat ENVELOPE(166.500,166.500,-78.000,-78.000)
geographic McMurdo Ice Shelf
geographic_facet McMurdo Ice Shelf
genre Ice Shelf
McMurdo Ice Shelf
genre_facet Ice Shelf
McMurdo Ice Shelf
op_rights Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
cc-by-4.0
op_rightsnorm CC-BY
op_doi https://doi.org/10.6084/m9.figshare.1011891
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