It wasn't so long ago summer was the slow season for college basketball roster adjustments. The continuing proliferation of the transfer scene has changed that.

When ESPN began its transfer tracker a decade ago, the list included about 200 names. That number swelled to 700 this year, with several of the Colorado Buffaloes' rivals in the Pac-12 Conference still reeling from unforeseen defections.

"You know at the end of the season some good players are going to be available," CU head coach Tad Boyle said. "To say it's not part of the recruiting model now is just wrong. It's a necessary evil."

Here is a look at who switched teams, who left early, and who is arriving for the various teams around the Pac-12.

Arizona Wildcats

Key losses: Ryan Anderson (graduation); Kaleb Tarczewski (graduation); Gabe York (graduation).

Notes: Arizona avoided a significant possible early defection when guard Allonzo Trier opted to return for his sophomore season after averaging 14.8 points last year as a freshman. While the Wildcats graduated three of their top four scorers and two players in Anderson and Tarczewski who accounted for about 42 percent of Arizona's rebounds, coach Sean Miller is set to welcome a recruiting class ranked No. 1 in the Pac-12 and third in the country by Rivals.com.

Arizona State Sun Devils


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Key losses: Savon Goodman (transfer).

Notes: The Sun Devils suffered their share of growing pains in Bobby Hurley's first year as head coach, losing six of their final games to finish with a 15-17 mark. Yet don't be surprised if ASU makes a significant jump in Hurley's second season, as the former Duke star already has made a huge impact on the recruiting trail. Led by incoming freshmen Sam Cunliffe and Romello White, ASU's 2016 recruiting class was ranked fourth in the Pac-12 and 21st in the nation by Rivals.com. The Sun Devils also will add Shannon Evans to the mix, a transfer who practiced with Arizona State last season after spending two seasons with Hurley at Buffalo.

Cal Bears

Key losses: Jaylen Brown (early NBA draft entry); Jordan Matthews (transfer); Tyrone Wallace (graduation).

Notes: No team has experienced wild ride of highs and lows so far this offseason than the Bears. Brown's decision to bolt for the NBA after his freshman season was offset by his classmate, 6-foot-11 Ivan Rabb, opting to return. The Bears were stunned by Matthews' decision to transfer for his senior season, robbing Cal of a dependable leader who doubled as one of the top 3-point shooters in the Pac-12. A graduate transfer who will be eligible immediately, Matthews reportedly is leaning toward Gonzaga. Though his loss was glaring, Cal landed one of the gems of the transfer season in Kentucky's Marcus Lee, who will not be eligible until 2017-18.

Colorado Buffaloes

Key losses: Tre'Shaun Fletcher (transfer); Josh Scott (graduation).

Notes: Fletcher's defection came as somewhat as a surprise after he averaged a career-best 7.1 points this past year as a junior, but his transfer alongside that of Kenan Guzonjic allowed Boyle to bolster the Buffs' depth for 2016-17. With 7-footer Dallas Walton and versatile guards Bryce Peters and Deleon Brown already on board for next season, Boyle used one of those unexpectedly open scholarships to add 6-foot-10 forward Lucas Siewert to the 2016 class while still keeping the other scholarship in reserve for future use. Add those talents to a rotation that welcomes back Xavier Johnson from injury and adds transfer Derrick White, and CU is well-positioned to replace leading scorer and rebounder Josh Scott.

Oregon Ducks

Key losses: Elgin Cook (graduation).

Notes: The Ducks hit the jackpot when the trio of Dillon Brooks, Tyler Dorsey, and Chris Boucher decided to remain at Oregon, with Brooks and Dorsey withdrawing from early draft consideration. Oregon also added a premier transfer in Kavell Bigby-Williams, arguably the nation's most coveted recruit from the junior college ranks. After winning the Pac-12 regular season and tournament titles while earning a No. 1 seed in the NCAA Tournament, the Ducks once again will be among the nation's elite.

Oregon State Beavers

Key losses: Gary Payton III (graduation); Olaf Schaftenaar (graduation).

Notes: The Beavers reached the NCAA Tournament for the first time since Gary Payton Sr. led OSU in 1990, and outside Payton III the Beavers suffered few significant losses in its rotation — though the extremely versatile Payton did lead his team in points, assists, rebounds, and steals. Tres Tinkle is poised to emerge as one of the top players in the league after averaging 13.1 points and 5.4 rebounds as a true freshman last season.

Stanford Cardinal

Key losses: Rosco Allen (early NBA draft entry); coach Johnny Dawkins.

Notes: Jerod Haase replaced Dawkins (eight seasons) in the Pac-12's only coaching change. His regime got off to a rough start when leading scorer Rosco Allen opted to try his fortune in the NBA draft, though he is not expected to be a first round or even high second round selection. Other than Allen the Cardinal expects to return much of the cast that went 15-15 last season while welcoming back Reid Travis, who averaged 6.4 points and 6.6 rebounds as a freshman two years ago before missing the final 22 games last year due to a foot injury.

UCLA Bruins

Key losses: Tony Parker (graduation).

Notes: Perhaps no team in the Pac-12 was more perplexing in 2015-16 than the Bruins, whose lofty preseason expectations ended with a 15-17 record. It could be a make-or-break year for coach Steve Alford, who returns his top two scorers and four double-figure scorers overall. That core will team with a 2016 recruiting class ranked second in the Pac-12 and fifth in the nation by Rivals.com. The gem of that class is Lonzo Ball, a true point guard who could prove to be a much-needed facilitator for UCLA's array of scorers.

USC Trojans

Key losses: Julian Jacobs (early NBA draft entry); Nikola Jovanovic (early NBA draft entry); Katin Reinhardt (transfer).

Notes: A breakout year for the Trojans came with a heavy price, as juniors Jovanovich (12.1 ppg, 7.0 rpg) and Jacobs (11.6 ppg) left early for the NBA draft though there is scant hope either player will be selected. Reinhardt (11.4) left as a graduate transfer to Marquette. USC still features dynamic guard Jordan McLaughlin, but early indications are the depleted Trojans will be challenged to repeat last year's 21-win season.

Utah Utes

Key losses: Brekkott Chapman (transfer); Jordan Loveridge (graduation); Jakob Poeltl (early NBA draft entry); Brandon Taylor (graduation).

Notes: The graduation of Taylor and Loveridge will be nearly as devastating for the Utes as the early departure of Poeltl, the Pac-12 Player of the Year who could be a top-10 pick in the NBA draft. Utah still boasts Kyle Kuzma and Lorenzo Bonham, best known by Buffs fans for his buzzer-beater that lifted Utah to victory last year at the Coors Events Center. Six-foot-11 Czech national Jakub Jokl is an intriguing addition who will try to pick up the slack for Poeltl in the post.

Washington Huskies

Key losses: Andrew Andrews (graduation); Marquese Chriss (early NBA draft entry); Dejounte Murray (early NBA draft entry).

Notes: Huskies coach Lorenzo Romar experienced the pratfalls of the one-and-done era this past year, as the highly-lauded additions of Chriss and Murray resulted only in an NIT berth and a quick collegiate exit for the talented duo. Andrews was the leading scorer in the league last year, but the Huskies still feature a talented cast of underclassmen that will be bolstered by a recruiting class led by Markelle Fultz, regarded as one of the top point guard prospects in the nation.

Washington State Cougars

Key losses: Valentine Izundu (transfer); Que Johnson (transfer); Junior Longrus (graduation); Ny Redding (transfer).

Notes: The second season under coach Ernie Kent ended with a 1-17 league mark, a last-place finish, and a rash of postseason defections. That list includes the team's third-leading scorer and top 3-point shooter (Johnson) as well as a premier interior defender in Izundu. WSU is set to return its top two scorers in Josh Hawkinson (15.4 ppg, 11.1 rpg) and Ike Iroegbu, but it is difficult to project an escape from rebuilding mode for the Cougars.

Pat Rooney: rooneyp@dailycamera.com or twitter.com/prooney07