Quantifying relations between altered hydrology and fish community responses for streams in Minnesota

Ziegeweid, Jeffrey R.; Johnson, Gregory D.; Krall, Aliesha L.; Fitzpatrick, Kara; Levin, Sara B.

doi:10.1186/s13717-022-00383-z

Ecological Processes

Table 2 Categories and definitions of hydrologic explanatory metrics described in the “Results and discussion” section

From: Quantifying relations between altered hydrology and fish community responses for streams in Minnesota

Category	Metric	Definition
Continental	amplitude	Amplitude of the seasonal signal
Continental	ar1	AR1 correlation coefficient
Continental	phase	Phase of the seasonal signal
Duration	dh6	Variability of annual maximum daily flows
Duration	dh7	Variability of annual maximum 3-day moving average flows
Duration	dh8	Variability of annual maximum 7-day moving average flows
Duration	dh9	Variability of annual maximum 30-day moving average flows
Duration	dh10	Variability of annual maximum 90-day moving average flows
Duration	dh14	Flood duration: the 95th percentile value divided by the mean of the monthly means
Duration	dh19	High flow duration: average duration of flow events with flows above seven times the median flow value for the entire flow record
Duration	dh21	High flow duration: average duration of flow events with flows above the 25th percentile value for median annual flows
Duration	dh22	Flood interval: median number of days between flood events with flows greater than the 1.67 year recurrence interval flow
Duration	dh23	Flood duration: median number of days annually that flow remains above the 1.67 year recurrence interval flow
Duration	dh24	Flood-free days: median of the annual maximum number of days that the flow is below the 1.67 year recurrence interval flow
Duration	dl1	Median of annual minimum of 1-day moving average flows
Duration	dl5	Median of annual minimum of 90-day moving average flows
Duration	dl9	Variability of annual minimum of 30-day moving average flows
Duration	dl14	Low exceedance flows: the 75-percent exceedence value for the entire flow record divided by the median for the entire record
Duration	dl15	Low exceedance flows: the 90-percent exceedence value for the entire flow record divided by the median for the entire record
Frequency	fh1	High flood pulse count: median number of events with flows above a threshold equal to the 75th-percentile value for the entire flow record
Frequency	fh2	Variability in high flood pulse count: 100 times the standard deviation in annual pulse counts divided by the median pulse count
Frequency	fh5	Flood frequency: median number of events with flows above the median flow value for the entire flow record
Frequency	fh6	Flood frequency: median number of events with flows above three times the median flow value for the entire flow record
Frequency	fh7	Flood frequency: median number of events with flows above seven times the median flow value for the entire flow record
Frequency	fh10	Flood frequency: median number of events with flows above the median annual minima of the entire flow record
Frequency	fl2	Variability in low flood pulse count: 100 times the standard deviation in annual pulse counts divided by the median pulse count
Magnitude	ma1	Mean of daily mean flow values for the entire flow record
Magnitude	ma6	Range in daily flows is the ratio of the 10-percent to 90-percent exceedence values for the entire flow record
Magnitude	ma14	Median of monthly March flows over the entire flow record
Magnitude	ma16	Median of monthly May flows over the entire flow record
Magnitude	ma21	Median of monthly October flows over the entire flow record
Magnitude	ma24	Coefficient of variation of median January flow values
Magnitude	ma25	Coefficient of variation of median February flow values
Magnitude	ma26	Coefficient of variation of median March flow values
Magnitude	ma31	Coefficient of variation of median August flow values
Magnitude	ma32	Coefficient of variation of median September flow values
Magnitude	ma33	Coefficient of variation of median October flow values
Magnitude	ma34	Coefficient of variation of median November flow values
Magnitude	ma35	Coefficient of variation of median December flow values
Magnitude	ma38	90th percentile minus the 10th percentile divided by the median of the monthly mean flows for all months in the flow record
Magnitude	ma39	Standard deviation times 100 divided by the median of the monthly mean flows for all months in the flow record
Magnitude	ma40	Mean of the monthly flow means minus the median of the monthly means divided by the median of the monthly means
Magnitude	mh2	Maximum February flows across all years in the flow record
Magnitude	mh3	Maximum March flows across all years in the flow record
Magnitude	mh6	Maximum June flows across all years in the flow record
Magnitude	mh7	Maximum July flows across all years in the flow record
Magnitude	mh10	Maximum October flows across all years in the flow record
Magnitude	mh11	Maximum November flows across all years in the flow record
Magnitude	mh13	Coefficient of variation across maximum monthly flows: Standard deviation times 100 divided by mean maximum monthly flow for all years
Magnitude	mh21	High flow volume index: average volume for flow events above median flow for entire record divided by median flow for entire record
Magnitude	ml3	Median minimum March flow across all years
Magnitude	ml4	Median minimum April flow across all years
Magnitude	ml5	Median minimum May flow across all years
Magnitude	ml6	Median minimum June flow across all years
Magnitude	ml15	Mean of ratios of minimum annual flow to the mean flow for each year
Magnitude	ml18	Variability in base flow
Magnitude	ml20	Ratio of total base flow to total flow
Magnitude	ml21	Variability across annual minimum flows: standard deviation of annual minimum flows times 100 divided by mean of annual minimum flows
Magnitude	ml22	Median of annual minimum flows divided by the drainage area
Rate of change	ra3	Fall rate: median change in flow for days in flow record in which change is negative
Rate of change	ra4	Variability in fall rate: 100 times the standard deviation divided by the median fall rate
Rate of change	ra5	Number of day rises: the number of positive-gain days divided by the total number of days in the flow record
Rate of change	ra9	Variability of reversals: 100 times standard deviation divided by median number of days each year when change in flow changes direction
Timing	ta1	Constancy in the timing of flows
Timing	ta2	Predictability in the timing of flows
Timing	ta3	Maximum number of days with flows above 1.67 year recurrence interval flow in any two-month period divided by total number of flood days
Timing	th1	Mean Julian date of annual maximum flows
Timing	th2	Coefficient of variation for the mean Julian date of annual maximum flows
Timing	th3	Maximum length of flows less than 1.67-year recurrence interval flows in all years of record
Timing	tl1	Mean Julian date of annual minimum flows
Timing	tl2	Coefficient of variation for the mean Julian date of annual minimum flows

Back to article page