keystone species - 2025 ACF Winter

Question

Some people say that quizbowl needs more engineering content. Answer the following about ecosystem engineers, species responsible for shaping their environments, for 10 points each.

[10e] Ecosystem engineers are considered a subset of these species that have a disproportionate effect on an ecosystem for their population size. The grey wolf is an example of these species in Yellowstone National Park.

ANSWER: keystone species

[10m] Ecosystem engineers have the ability to increase this quantity, the number of distinct species in a community. This component of biodiversity does not account for relative abundance.

ANSWER: species richness

[10h] In the Great Barrier Reef, these keystone species scrape and clean coral. These fish use their distinctive tooth structure to grind down rocky substrates before producing white sand as excrement.

ANSWER: parrotfish

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Summary


California	Main	Y	5	16.00	100%	40%	20%
Canada	Main	Y	1	10.00	100%	0%	0%
Florida	Main	Y	13	16.92	85%	23%	62%
Great Lakes	Main	Y	6	11.67	50%	0%	67%
Lower Mid-Atlantic	Main	Y	7	14.29	100%	14%	29%
Midwest	Main	Y	10	14.00	90%	20%	30%
North	Main	Y	10	19.00	100%	30%	60%
Northeast	Main	Y	5	14.00	100%	0%	40%
Overflow	Main	Y	4	22.50	100%	50%	75%
Pacific Northwest	Main	Y	12	18.33	92%	42%	50%
South Central	Main	Y	5	20.00	80%	40%	80%
Southeast	Main	Y	12	20.00	100%	50%	50%
UK	Main	Y	4	25.00	100%	100%	50%
Upper Mid-Atlantic	Main	Y	8	20.00	88%	50%	63%
Upstate NY	Main	Y	8	16.25	100%	38%	25%
2025 ACF Nationals	2025-08-09	Y	14	17.14	93%	36%	43%
2024 ARCADIA at UC Berkeley	04/19/2025	Y	4	20.00	100%	25%	75%

Data


Berkeley D	Stanford A	10	10	0	20
Berkeley B	Stanford C	10	0	0	10
Berkeley C	UCSC	10	10	0	20
Berkeley E	Stanford B	10	0	10	20
Berkeley A	Berkeley F	10	0	0	10
UCLA A	UCLA D	10	0	0	10
Queen's B	Guelph B	0	0	10	10
McGill C	McGill B	10	0	0	10
Guelph A	McMaster A	10	0	10	20
Toronto E	McMaster B	10	0	10	20
Toronto H	McMaster C	10	0	10	20
Carleton	Queen's A	10	0	0	10
Toronto A	Toronto D	10	10	10	30
Toronto B	Ottawa	10	10	0	20
McGill A	Toronto C	10	10	10	30
Toronto F	Toronto J	0	0	0	0
Toronto K	Toronto I	10	0	10	20
Toronto Metropolitan	Toronto G	10	0	0	10
Waterloo	Western Ontario	10	0	10	20
Melbourne B	ERAU B	10	0	10	20
UCF B	FIU	10	0	0	10
UF B	FSU	10	0	0	10
UF C	Melbourne A	0	0	10	10
UF D	UCF A	0	0	10	10
USF	ERAU A	0	0	10	10
CWRU B	CWRU D	10	0	0	10
Pitt C	CWRU C	10	0	0	10
MSU A	Kenyon A	10	10	10	30
OSU A	CWRU A	10	0	0	10
OSU B	Kenyon B	10	0	10	20
OSU C	Pitt B	10	0	0	10
OSU D	Pitt A	10	0	0	10
North Carolina B	Clemson A	10	0	0	10
NC State	Clemson B	10	0	0	10
James Madison	North Carolina C	10	10	10	30
North Carolina A	Tusculum	10	0	0	10
Liberty C	Roanoke	10	0	0	10
Liberty B	South Carolina B	0	0	0	0
Tennessee A	Virginia Tech B	10	0	0	10
Virginia Tech A	Tennessee B	10	0	10	20
South Carolina A	Virginia A	10	10	10	30
Liberty A	Virginia B	10	0	0	10
George Mason A	Notre Dame E	10	0	0	10
George Mason C	George Washington B	10	0	10	20
Georgetown A	George Washington A	10	0	10	20
Georgetown B	Johns Hopkins A	10	0	0	10
Johns Hopkins C	Johns Hopkins B	10	0	0	10
Maryland A	Maryland C	10	10	10	30
UMBC A	Maryland D	10	10	10	30
VCU A	NYU A	10	0	10	20
NYU B	Penn A	10	0	10	20
George Mason B	Catholic University	10	10	0	20
Columbia A	Swarthmore A	10	0	10	20
Columbia B	Rutgers C	10	0	0	10
Columbia C	Rutgers B	10	0	0	10
Rowan A	Princeton A	10	0	0	10
Vassar A	Lehigh B	10	0	10	20
WashU A	WashU C	10	0	10	20
William Woods	Missouri A	10	0	0	10
Missouri B	SIUE	10	10	10	30
Truman State	WashU D	10	10	10	30
Chicago C	Chicago B	10	10	10	30
UIC	Illinois A	10	10	0	20
Indiana A	Michigan B	10	10	10	30
Illinois C	Kentucky	10	0	10	20
Indiana B	Michigan C	0	0	0	0
Notre Dame A	Chicago A	10	0	0	10
Notre Dame B	Notre Dame C	10	10	0	20
Louisville A	Notre Dame D	10	10	10	30
Michigan A	Purdue A	10	0	0	10
Purdue B	Michigan D	10	0	0	10
Louisville B	Purdue C	10	0	10	20
Carleton	Iowa State	10	10	10	30
Macalester B	Minnesota B	0	0	0	0
St. Thomas	Minnesota C	10	0	10	20
Nebraska	Minnesota A	10	0	10	20
Macalester A	Wisconsin	10	10	10	30
Illinois B	Chicago D	10	0	10	20
MIT A	BU	10	10	0	20
BC A	Amherst B	10	10	0	20
Amherst A	BC B	10	10	10	30
Tufts A	Brandeis Clemenceau	10	0	10	20
Bowdoin B	Brandeis Orlando	10	10	10	30
Brandeis Wilson	Dartmouth	10	0	10	20
Yale A	Brown A	10	10	0	20
Cornell-UG	Brown B	10	0	10	20
Harvard	Tufts B	10	10	0	20
Brandeis Lloyd George	Williams	10	0	10	20
Yale B	MIT B	10	0	0	10
Brown C	Bowdoin A	10	0	0	10
British Columbia C	Alberta	10	10	10	30
British Columbia D	Simon Fraser	10	10	0	20
British Columbia A	Washington A	10	10	0	20
British Columbia B	Washington B	10	10	10	30
McGill D	Rose State	10	0	10	20
Arizona State A	Northwestern C	10	10	10	30
Northwestern B	Alberta B	10	10	10	30
Texas B	Tulsa	10	10	10	30
UCO	Iowa	10	0	0	10
Ohio	UTD A	10	0	0	10
Arizona State B	UTD B	0	0	0	0
Texas A	Northwestern A	10	10	10	30
Georgia Tech D	Auburn B	10	0	0	10
Alabama A	Huntsville B	10	0	10	20
Auburn A	Huntsville A	10	0	0	10
Georgia Tech B	Georgia Tech C	10	0	0	10
Vanderbilt A	Mississippi State A	10	10	0	20
Alabama B	Sewanee A	10	0	0	10
Georgia Tech A	UAB A	10	10	10	30
Bruin A	Vanderbilt B	10	10	0	20
Bristol A	Oxford A	10	10	0	20
Warwick A	Birmingham A	10	10	0	20
Cambridge B	Oxford B	10	10	0	20
Durham A	Warwick B	10	0	10	20
Sheffield C	Durham B	10	0	0	10
Cambridge C	Edinburgh A	10	0	10	20
Edinburgh B	Sheffield B	10	0	0	10
LSE A	Imperial A	10	0	0	10
Imperial B	Imperial C	10	0	10	20
Sheffield A	Manchester A	0	0	0	0
Manchester B	Cambridge D	10	0	10	20
Southampton A	Cambridge A	10	10	0	20
Southampton B	LSE B	10	0	10	20
Bristol B	City St George's A	10	10	10	30
Binghamton A	Binghamton B	10	0	10	20
Syracuse	Cornell-DII	10	0	10	20
RIT A	ESF	10	0	0	10
RIT B	Rochester	10	10	10	30