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Proposal defense > NRE dynamics > Flashcards

NRE dynamics Flashcards

1
Q

What is chl-a an indicator of?

A

phytoplankton biomass

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2
Q

True or False: the NRE experiencing increased hurricane frequency since the mid-1990s

A

True for 1995-2011 (Paerl et al. 2014), though there has been a decrease in recent years, possibly due to the development of an El Nino

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3
Q

What major phytoplankton group is most abundant in moderate flow waters?

A

diatoms

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4
Q

What major phytoplankton groups are most abundant in low flow waters? (2)

A

dinoflaggelates, cyanobacteria

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5
Q

What major phytoplankton groups are most abundant in high flow waters? (2)

A

cryptophytes and chlorophytes

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6
Q

The NRE is preliminar _________ limited

A

nitrogen

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7
Q

High FW discharge after a storm event can lead to high ________ and low _______ and residence times.

A

flushing

chl-a/biomass

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8
Q

____________ ______________ ultimately controls longitudinal transport and residence time.

A

freshwater discharge

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9
Q

Where does the chl-a max form?

A

Where residence time increases in coincidence with adequate nutrient supplies (these are often correlated in the NRE)

River morphology is also important– often formes at the bend in the estuary

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10
Q

How does a drought/storm event affect the location of the chl-a?

A

Drought– less FW flushing, moves chl-a max upstream

Storm– more FW flushing, moves chl-a max downstream

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11
Q

What is the average residency time in the Neuse?

A

2-3 months

69 days in Sept, 81 days in Oct according to Paerl et al. 2006

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12
Q

How might a large storm event affect residence time in the estuary

A

Drastically decreases (from months to ~a week in 1999)

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13
Q

Why do we see elevated chl-a after a hurricane?

A

Caused by fertilization of downstream waters caused by increased FW discharge

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14
Q

When were P inputs banned in the NRE watershed?

A

1980s

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15
Q

Did the P ban have any effect on N concentrations?

A

NO; may have actually promoted N-enrichment downstreeam

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16
Q

FW is __ limited.

A

PO4

17
Q

SW is __ limited.

A

NO3

18
Q

Salinity is a function of ______, _______, and _______ in the NRE

A

precipitation; flow, wind-driven mixing

19
Q

What are the nutrient-related characteristics of site 30 in the NRE?

A

upper NRE, where most nutrients are delivered but have short residence times due to the morphology of the estuary

20
Q

What are the nutrient-related characteristics of the middle NRE (sites 70 and 120)?

A

Where chl-a concentration is highest due to widening (increased res times); also see stratification here often

21
Q

Where is the USGS streamflow gauging station used in Hans’ studies?

A

Near Kinston, 20km upstream of Streetsferry Bridge in New Bern

22
Q

What phytoplankton group tends to be most abundant in the summer months (according to Valdes-Weaver et al. 2006)?

A

Cyanobacteria

23
Q

True or false: Low flow rates cause phytoplankton advection downstream.

A

False; HIGH flow rates cause phytoplankton advection downstream

24
Q

Why is tidal amplitude in the NRE so low?

A

Barrier islands; get low tidal amplitude through small inlets

25
Q

Is there any seasonal signal to FW flow in the NRE?

A

Yes, weak seasonality w/ higher flows in the late winter/early spring

26
Q

When is the NRE N-limited?

A

In the late spring through fall, when primary productivity is high

27
Q

What is the average residence time in the Neuse?

A

> 1 month

28
Q

Why is it important that avg residence time>phytoplankton generation time?

A

Allows phytoplankton biomass to accumulate

29
Q

What is the formulat for residence time?

A

T = v/q

Where v = the capacity/volume of the system and q = the flow/discharge rate

30
Q

What paper looked at Vibrio/phytoplankton in the NRE in 2004?

A

Hsieh et al. 2007

31
Q

What was the general relationship of Vibrio and chlorophyll a shown by Hsieh et al. 2007?

A

Vibrio and chlorophyll a both increased moving downstream; however, past the salt front Vibrio alone increased and chlorophyll a began to decline

32
Q

In Hsieh et al. 2007 what was the relationship between Vibrio and DOC? Salinity?

A

both positive

33
Q

What paper saw an increase in Vibrio during storm events in the Neuse?

A

Wetz et al. 2008 (relative increase compared to the concentrations predicted by temperature/salinity models

34
Q

Where is the weather station used to monitor wind in the NRE?

A

New Bern airport

35
Q

Which paper looked at sediment/water column transport of Vibrio and FIB?

A

Fries et al. 2008

Proposal defense (9 decks)

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