biodiversity - 2025 ACF Fall

Tossup

A hypothesis for how herbivores and pathogens affect levels of this quantity in forests was proposed by Janzen and Connell. (10[1])A measure of this quantity is given by (10[1])[read slowly] “one minus the sum (10[1]-5[1])of little n (10[1])times (10[1])little (10[1])n (10[1])minus (10[1]-5[1])one, (10[2])over big N (-5[1])times big N minus (10[1])one.” (10[2])Measures for this quantity (10[1])named for (10[1])Simpson (10[3])and (10[1])Shannon (10[14])consider (10[10])both (10[1]-5[2])evenness (10[4]-5[1])and richness. (10[12]-5[3])A “latitudinal (10[5])gradient” (10[3]-5[1])describes (10[1])how (10[1])this biological (10[1])quantity (10[2])increases (10[3])near (10[1])the tropics. (10[8]-5[4])Regions (10[2])with (10[2])high (10[3])values (10[1])for this (10[3])quantity (-5[1])that are threatened (10[1])by human habitation (10[2])are known (10[1])as its “hotspots” (10[2])and include the (10[1])Amazon Rainforest. (10[1])For 10 points, name this quantity that measures the variability (10[1])of species in a region. ■END■ (10[9])

ANSWER: biodiversity [accept biodiversity hotspots; accept latitudinal diversity gradient; accept Simpson diversity index or Gini–Simpson diversity index or Gini’s diversity index or Shannon diversity index; prompt on species evenness until read by asking “can you be less specific?”; prompt on species richness until read by asking “can you be less specific?”; prompt on Gini impurity by asking “what quantity does that measure?”]

<Editors, Biology>

= Average correct buzz position

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Buzzes

Player	Team	Opponent	Position	Value
Joseph Strom	Louisville B	Michigan C	19	10
Ilyas Choukri	Virginia Tech A	Virginia Tech B	27	10
Elliott Gomes	Dartmouth A	Vermont B	31	-5
Anne Fjeld	Alberta A	Washington Steelhead	31	10
Vishrut Pisupati	Imperial B	Cambridge C	34	10
Jason Lee	Rutgers A	Maryland C	35	10
Alan Cai	Amherst A	Brown A	36	10
Matthew Westley	Purdue A	Purdue C	37	10
David Yuan	Berkeley Little Prince	Stanford A	38	10
Connor King	St. Thomas	Wisconsin A	38	-5
Alden Thompson	Carleton A	Carleton B	39	10
Salil Jain	Williams B	Brandeis Mozart	39	10
Francis Dinh	Illinois Canada	Indiana A	42	-5
Danny Han	Stanford B	Berkeley Archer Queen	46	10
Rohan Soni	UCLA F	UC Irvine	47	10
Jason Thieu	Michigan State A	Michigan B	47	10
Louis Harney	Georgia Tech B	Georgia Tech F	51	10
Liam Henderson	McMaster B	Toronto E	53	10
Aarav Kakad	UCLA C	UCSD B	54	10
Yoyo Liu	British Columbia C	Washington Chum	54	10
David Xilbille	Georgia Tech C	Clemson A	54	10
Brayden Zhang	Vanderbilt B	Vanderbilt C	55	10
Hansen Jin	Berkeley Skeleton King	UCSC	56	10
March Delfin	UCSD A	UC Santa Barbara	56	10
Andrew Nucci	UCLA B	UCLA D	56	10
Nicholas Nguyen	Florida B	Florida A	56	10
Sai Subramanian	CWRU A	Michigan A	56	10
Snehan Saroch	Louisville A	CWRU B	56	10
Eric Cameron	Michigan State C	WVU A	56	10
Andrea Owusu	Duke A	Liberty A	56	10
Samuel Li	William & Mary A	Virginia A	56	10
Xavier Bornhorst	Maryland A	George Mason A	56	10
Sriram Koritala	Illinois Blue	Illinois Champaign	56	10
Vishnu Sharma	Texas	British Columbia A	56	10
Annabelle Koopmans	Washington Atlantic	British Columbia B	56	10
Gregory Stone	ESF	Cornell A	56	10
Abhay Ariyapappillil	Ottawa B	McGill C	57	10
Brendan Bridle	Queen's A	Toronto F	57	10
Nathaniel Godfrey	Toronto D	Waterloo A	57	10
Alma Gazzaniga	UNC B	VCU A	57	10
Beckett Pursey	Purdue B	Iowa B	57	10
Jacky Li	MIT B	Brandeis Beethoven	57	10
Samarth Prajapati	Georgia Tech E	Emory A	57	10
Nitish Sudhakar	Georgia Tech A	Tennessee A	57	10
Sia Kalia	Warwick	Imperial A	57	10
Eric Zhu	Cornell D	RIT B	57	10
Carter Yott	McMaster A	Toronto B	58	-5
Zoe Brennan	Virginia Tech C	UNC C	58	10
Yasmin Campbell	Cambridge B	Cardiff	58	-5
Chris Chang	USC A	UCLA A	59	-5
Indigo Chen	Waterloo C	Waterloo B	59	10
Emmet Ewing	Michigan State B	Ohio State A	59	10
Atreya Mallanna	Brown B	Dartmouth B	59	10
Daniel Lu	Washington Pink	Washington Sockeye	59	10
Suren Grigorian	Berkeley Mighty Miner	Berkeley Boss Bandit	61	10
Joseph Wang	UCLA E	USC B	61	10
Shaynee Ruffle	Toronto G	Guelph A	61	10
Nate Brown	CWRU C	Ohio State C	61	-5
Kevin Nolan	NCSU B	Liberty C	61	10
Sophia Jagels	William & Mary B	William & Mary C	61	10
Owen Ashbrook	Iowa A	Chicago A	61	10
Alex Dzurick	William Woods University A	Rose-Hulman A	61	10
Ethan Enochian	Purdue D	WashU Grolars	61	-5
Yvonne Pan	Amherst B	Tufts C	61	10
Surya Dinesh	MIT A	Boston College A	61	10
Reid Eichberg	Tufts B	UConn A	61	10
Jeremy Scurlock	Chipola College	Alabama A	61	10
Aman Sreshta	Clemson C	Clemson B	61	10
Eve Gatley	Bristol	Cambridge D	61	-5
Scarlet Rutter	Claremont A	Claremont B	63	10
Thomas Brittain	McMaster C	Toronto I	63	10
Ethen Sun	Toronto C	Toronto A	63	10
Ishan Chahande	Ohio State D	Louisville C	63	10
Eric Lipsutz	Chicago B	Illinois Urbana	63	10
Joshua Lam	Ohio State B	CWRU D	64	10
Bonham Buchannon	Louisville D	Kentucky	64	-5
Pratham Bhanushali	WVU B	Michigan State D	64	10
Ben Stras	Wisconsin C	Minnesota	64	10
Laura Bullock	Sheffield A	Durham B	65	10
Judah Garlic	Cornell C	RIT A	66	10
Coy Mier	Auburn B	Auburn A	68	10
Tobias Cortes	Indiana A	Illinois Canada	69	10
Judah Solomon	Imperial D	Cambridge E	69	10
James Haddix	Washington State	Arizona State A	70	10
Darren Kellis	Vanderbilt A	South Carolina A	70	10
Jonah McGinley	Rochester	Binghamton B	70	10
Rufus Gladwell	Durham A	Edinburgh A	71	10
Nick Machin	UCLA A	USC A	73	10
Yishak Kelkay	ERAU Daytona A	Florida Tech B	73	-5
Juan Landaeta	Florida State A	South Florida A	73	10
Zac Stapler	Pittsburgh	Michigan D	73	10
Ben Kantsiper	JMU B	Liberty B	73	10
Joseph Cole	UNC A	NCSU A	73	10
Emily Justak	Indiana B	WashU Grizzlers	73	10
Adam Chilbert	Macalester	Iowa State	73	-5
Kayla Drajpuch	Brandeis Bach	Boston University A	73	-5
Mata Cooper	Southampton	Birmingham	73	10
Michael Shipman	Cambridge D	Bristol	73	10
Shlok Dev	LSE	Imperial C	73	-5
Tristan Scarlett	Ottawa D	Ottawa A	74	10
Ryan Gomes	Florida Tech A	UCF A	74	10
Luke Houtz	Arizona State B	Washington Coho	75	10
Ethan Miniard	Montevallo	Georgia Tech D	75	10
Haylee Weisner	Washington Masu	Boise State	76	10
Richard D’Angelo	Tennessee B	Sewanne	76	10
Pen Hughes	Edinburgh C	Durham C	76	10
Alex Miller	Edinburgh B	Durham D	77	10
Charlie Ruff	McGill A	McGill B	79	10
Charlie Rickards	Ottawa C	McGill E	79	10
Daniel Slater	Tennessee Tech	Georgia A	79	10
Minh Nguyen	Cornell B	Binghamton C	80	-5
Sicheng Jiang	Toronto H	Brock A	83	10
Nayaaz Hashim	Oxford	Cambridge A	86	10
Molly Oakley	Binghamton C	Cornell B	86	10
Nishad Joshi	Kentucky	Louisville D	88	10
Alex Matchinski	Michigan Tech	Wisconsin B	91	10
Abby Tipton	Auburn C	Mississippi State A	91	10
Ethan Skolnick	WashU Grolars	Purdue D	94	10
Oliver Morten	Cardiff	Cambridge B	96	10
Eleanor Arron	Williams C	Harvard	106	10
Chris Wang	Toronto B	McMaster A	112	10
Will Massey	Florida Tech B	ERAU Daytona A	112	10
Miles Spieler	Ohio State C	CWRU C	112	10
Drew Wetterlind	Iowa State	Macalester	112	10
Sebastian Llaca	Wisconsin A	St. Thomas	112	10
Jaehyun Park	Boston University A	Brandeis Bach	112	10
David Ciardella	Vermont B	Dartmouth A	112	10
Benjamin Turner	York	Edinburgh D	112	10
Siheon Lee	Imperial C	LSE	112	10

Summary

Tournament	Edition	TUH	Conv. %	Neg %	Average Buzz
UK (North)	UK	5	100%	0%	80.20
UK (South)	UK	8	100%	38%	75.00
Northern California	US	4	100%	0%	50.25
Southern California	US	7	100%	14%	58.57
Eastern Canada (1)	US	5	100%	0%	65.60
Eastern Canada (2)	US	9	100%	11%	67.56
Florida	US	4	100%	25%	78.75
Great Lakes	US	12	100%	17%	63.08
Lower Mid-Atlantic	US	9	100%	0%	58.00
Upper Mid-Atlantic	US	2	100%	0%	45.50
Midwest	US	9	100%	22%	63.44
North	US	4	100%	50%	94.75
Northeast	US	10	100%	20%	70.40
Pacific	US	8	100%	0%	59.63
Southeast	US	13	100%	0%	65.77
Upstate NY	US	5	100%	20%	67.00