Daphnia magna - 2025 ACF Winter

Question

Aeration of lab cultures of this organism is sometimes inadvisable as bubbles will force them to float. For 10 points each:

[10h] What tiny crustacean is often used as a test organism in water quality testing? The transparency of these water fleas allows the observation of ephippia that may develop in adverse conditions.

ANSWER: Daphnia magna [or Daphnia magna]

[10e] Daphnia magna primarily inhabit this kind of water that is less saline than seawater or brackish water, seen in lakes and rivers. The American paddlefish lives in this kind of water.

ANSWER: freshwater

[10m] These invasive fish in North America have prompted the use of electrification of waterways to stop their spread to the freshwater Great Lakes. A large species of these fish has a tendency to leap out of the water when startled.

ANSWER: Asian carp [accept bighead carp or black carp or grass carp or silver carp]

<Editors, Biology>

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Summary


California	Main	Y	5	14.00	100%	40%	0%
Canada	Main	Y	3	16.67	100%	67%	0%
Florida	Main	Y	10	20.00	100%	90%	10%
Great Lakes	Main	Y	2	10.00	100%	0%	0%
Lower Mid-Atlantic	Main	Y	5	18.00	100%	80%	0%
Midwest	Main	Y	5	22.00	100%	100%	20%
North	Main	Y	7	17.14	86%	71%	14%
Northeast	Main	Y	3	13.33	100%	33%	0%
Overflow	Main	Y	4	22.50	100%	100%	25%
Pacific Northwest	Main	Y	9	16.67	89%	78%	0%
South Central	Main	Y	3	16.67	100%	67%	0%
UK	Main	Y	4	20.00	100%	75%	25%
Upper Mid-Atlantic	Main	Y	5	14.00	60%	60%	20%
Upstate NY	Main	Y	6	13.33	83%	50%	0%
2025 ACF Nationals	2025-08-09	Y	2	5.00	50%	0%	0%
2024 ARCADIA at UC Berkeley	04/19/2025	Y	2	15.00	100%	50%	0%
Northern California	Main	N	4	15.00	100%	50%	0%
Southern California	Main	N	6	16.67	100%	67%	0%
Eastern Canada (1)	Main	N	5	12.00	80%	40%	0%
Eastern Canada (2)	Main	N	9	11.11	67%	44%	0%
Florida	Main	N	3	6.67	33%	33%	0%
Great Lakes	Main	N	11	11.82	64%	55%	0%
Lower Mid-Atlantic	Main	N	9	8.89	44%	44%	0%
Upper Mid-Atlantic	Main	N	12	11.67	83%	33%	0%
Midwest	Main	N	9	13.33	89%	44%	0%
North	Main	N	3	13.33	100%	33%	0%
Northeast	Main	N	12	12.50	67%	50%	8%
Pacific	Main	N	8	8.75	63%	25%	0%
South Central	Main	N	7	8.57	57%	29%	0%
Southeast	Main	N	12	12.50	75%	50%	0%
UK (North)	UK	N	5	12.00	100%	20%	0%
UK (South)	UK	N	8	13.75	88%	50%	0%
Upstate NY	Main	N	5	14.00	100%	40%	0%

Data


Berkeley B	Berkeley D	0	10	10	20
Berkeley C	Stanford A	0	10	0	10
Berkeley E	UCSC	0	10	10	20
Berkeley A	Stanford C	0	10	0	10
Claremont Scripps	USC	0	10	10	20
UCLA C	UCLA B	0	10	0	10
UCSD What Hath God Wrought	UCSD Vices and Virtues	0	10	10	20
Ottawa	Guelph A	0	10	10	20
McMaster A	McMaster B	0	10	10	20
Toronto G	Queen's B	0	10	10	20
Toronto A	McGill A	0	10	0	10
Toronto D	Toronto C	10	10	10	30
Toronto I	Toronto F	0	10	10	20
Toronto H	McGill B	0	10	10	20
Toronto J	Toronto E	0	10	10	20
Toronto B	Toronto Metropolitan	0	10	10	20
Waterloo	McMaster C	0	10	10	20
Stanford B	Berkeley F	0	10	0	10
UCF B	UF C	0	10	0	10
UF B	UCF A	0	10	0	10
CWRU A	Kenyon A	0	10	10	20
OSU A	MSU A	0	10	10	20
OSU C	Pitt C	0	10	10	20
Pitt A	Kenyon B	0	10	0	10
CWRU C	Pitt B	0	10	10	20
Clemson A	North Carolina C	0	10	10	20
North Carolina A	Tennessee A	0	10	10	20
North Carolina B	Roanoke	0	10	10	20
Virginia A	Virginia Tech B	0	10	10	20
Virginia Tech A	Virginia B	10	10	10	30
Penn A	George Mason C	0	10	0	10
Maryland B	George Washington B	10	10	10	30
George Mason A	Maryland A	0	10	10	20
NYU A	Maryland D	0	10	10	20
NYU B	Georgetown B	0	10	10	20
UMBC A	Georgetown A	0	0	0	0
Penn B	VCU A	0	10	10	20
Columbia A	Rutgers B	0	10	0	10
Vassar A	Princeton A	0	10	10	20
Swarthmore A	Rowan A	0	10	0	10
Missouri A	Truman State	10	10	10	30
WashU A	SIUE	0	10	10	20
WashU B	WashU D	0	10	10	20
Missouri B	William Woods	0	10	10	20
Indiana A	Chicago B	0	10	10	20
Illinois B	Chicago A	0	10	10	20
Illinois C	Notre Dame A	0	10	10	20
Indiana B	Chicago C	0	10	10	20
Michigan A	Louisville A	0	0	10	10
Notre Dame B	Michigan C	0	10	10	20
Purdue A	Michigan D	0	10	0	10
Purdue B	Chicago D	0	10	10	20
Minnesota B	Iowa State	0	10	0	10
Macalester A	Minnesota C	0	10	10	20
Simon Fraser	Alberta	0	10	10	20
British Columbia A	British Columbia B	10	10	0	20
British Columbia C	British Columbia D	0	10	10	20
Washington A	Washington B	0	10	10	20
Minnesota A	St. Thomas	0	10	10	20
Illinois A	Notre Dame C	0	10	0	10
Alberta B	Tulsa	0	10	0	10
UTD A	Arizona State A	10	0	10	20
Arizona State B	McGill D	0	10	10	20
Northwestern C	Ohio	0	10	10	20
Northwestern A	UCO	0	0	0	0
Auburn A	Sewanee A	0	10	0	10
Georgia Tech C	Mississippi State A	0	10	0	10
Georgia Tech B	Huntsville A	0	0	10	10
Vanderbilt A	Alabama B	0	10	10	20
Vanderbilt B	Alabama A	0	10	10	20
Cambridge A	Bristol A	0	10	0	10
Manchester B	Edinburgh B	0	0	0	0
RIT A	Cornell-DII	0	10	0	10
RIT B	Binghamton A	0	10	10	20
Bruin A	Georgia Tech A	0	10	0	10