Assessing aquatic productivity in the housatonic river using the Algal assay:bottle test

Ram, Neil M.; Plotkin, Stephen

doi:10.1016/0043-1354(83)90049-0

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…2B) were higher during the decadal wet regime than during the decadal dry regime. During the wet regime, Mississippi River waters had an average N:P ratio closer to the Redfield (1958) ratio of 16:1, a ratio that indicates no limitation in N. During the dry regime, Mississippi River waters had an average N:P ratio of less than 10, a value that usually indicates conditions under which phytoplankton production is nitrogen limited (Ram and Plotkin, 1983;Sakshaug and Olsen, 1986). Abundance of early juveniles from seine surveys was higher in the central region than in the western region (Texas, Z= −5.938, P<0.001), supporting the need for a regional analysis of data.…”

Section: Resultsmentioning

confidence: 99%

Climate-related meteorological and hydrological regimes and their influence on recruitment of Gulf menhaden (Brevoortia patronus) in the northern Gulf of Mexico

Sanchez-Rubio¹,

Perry²

2015

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Abstract-Abundances of Gulf menhaden (Brevoortia patronus) in the northern Gulf of Mexico (GOM) are heavily influenced by physical and biological processes that affect refuge and food availability. This study identified specific decadal and interannual responses in the recruitment of Gulf menhaden to local meteorological and hydrological regimes imposed by the coupling of Atlantic Multidecadal Oscillation (AMO) and North Atlantic Oscillation (NAO) phases and by El Niño Southern Oscillation (ENSO) events. Numbers of age-0 menhaden in fishery-independent surveys and numbers and proportions of Gulf menhaden ages 1-6 in commercial purse-seine landings in the northern GOM were used to investigate those responses. High postlarval abundance of Gulf menhaden (3.6/beam plankton haul) in the central region was related to the decadal wet regime associated with AMO cold and NAO positive phases. Elevated numbers of menhaden species (38.3/seine haul) in the western region were related to interannual wet regimes associated with ENSO warm and neutral events. High commercial landings of Gulf menhaden (10 million fish/vessel ton week) were related to the decadal average hydrological regime associated with AMO cold and NAO negative phases. Climate regimes may favor growth and survival by structuring offshore and inshore nursery habitats or by synchronizing release of larvae when offshore and inshore nursery conditions are favorable.

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Section: Resultsmentioning

confidence: 99%

Climate-related meteorological and hydrological regimes and their influence on recruitment of Gulf menhaden (Brevoortia patronus) in the northern Gulf of Mexico

Sanchez-Rubio¹,

Perry²

2015

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“…On the other hand, the N :P molar ratios of all lake arms and the main inflows, were always below 1 after October, being 1 .4 the maximum value observed . These values are far from the colimitation range of 11-26 .5 (Thayer, 1974 ;Fricker, 1980 ;Ram & Plotkin, 1983), considering N :P as (NO3 + NO2 + NH4)-N/SRP . Ammonia-N was undetectable in a preliminary survey of the Lake .…”

Section: Discussionmentioning

confidence: 99%

Plankton and hydrochemistry of Lake Futalaufquen (Patagonia, Argentina) during the growing season

et al. 1995

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Plankton communities and hydrochemistry of an oligotrophic lake occupying a glacial valley in Argentinian Patagonia (42 °49'S ; 71 °43'W) were studied . Monthly samples at three stations integrated from 0 to 50 m and stratified samples at the site of maximum depth, were taken during the growing season . Transparency was always controlled by glacial silt, and not by phytoplankton . Lake water belongs to the calcium-bicarbonate type, with low conductivity (24 1tS cm -1 ), and poor buffering capacity. Forty-five phytoplankton taxa were found . Mean phytoplankton density was 49 cells ml -1 and mean biomass 69 Mg 1 -1 . N :P relationships, inorganic nitrogen exhaustion in the photic layer, and correlations between nutrients and phytoplankton density suggests nitrogen as the main limiting factor . Fifteen zooplankton species were found . Mean zooplankton density was 12 .2 ind . 1 -1 and mean biomass 22 .9 ug 1 -1 . Diatoms and Boeckellidae were the dominant planktonic groups . Morphometry and hydrological factors were responsible for horizontal heterogeneity in phytoplankton and chemical variables .

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“…The N:P ratios of natural phytoplankton assemblages generally average near the Redfield (1958) value of 16. Waters with ambient N:P ratios of less than 10 usually indicate potential conditions in which phytoplankton production is nitrogen limited, whereas values of greater than 21 are commonly indicative of phosphorus limitation (Ram and Plotkin, 1983;Sakshaug and Olsen, 1986). Determinations of limiting nutrient conditions based on ambient inorganic N:P ratios and corresponding results from bioassay determinations generally have been found to be in good agreement (Schanz and Juon, 1983).…”

Section: Effects Of Nitrogen and Phosphorus Additions On Phytoplanktomentioning

confidence: 98%

Effects of nitrogen and phosphorus additions on phytoplankton productivity and chlorophyll a in a subtropical estuary, Charlotte Harbor, Florida

Montgomery¹,

McPherson²,

Emmons³

1991

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Assessing aquatic productivity in the housatonic river using the Algal assay:bottle test

Cited by 5 publications

References 4 publications

Climate-related meteorological and hydrological regimes and their influence on recruitment of Gulf menhaden (Brevoortia patronus) in the northern Gulf of Mexico

Climate-related meteorological and hydrological regimes and their influence on recruitment of Gulf menhaden (Brevoortia patronus) in the northern Gulf of Mexico

Plankton and hydrochemistry of Lake Futalaufquen (Patagonia, Argentina) during the growing season

Effects of nitrogen and phosphorus additions on phytoplankton productivity and chlorophyll a in a subtropical estuary, Charlotte Harbor, Florida

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