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! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! POPULATION!GENETIC!STRUCTURE!AND!REPRODUCTIVE!ECOLOGY!OF! CROCODYLUS!ACROSS!LOCAL!AND!REGIONAL!SCALES! ! Natalia!A.!Rossi!! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Submitted!in!partial!fulfillment!of!the! requirements!for!the!degree!of! Doctor!of!Philosophy! in!the!Graduate!School!of!Arts!and!Sciences! ! COLUMBIA!UNIVERSITY! 2016! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ©!2016! Natalia!A.!Rossi!! All!rights!reserved! ABSTRACT! ! Population!Genetic!Structure!and!Reproductive!Ecology!of!Crocodylus! across!Local!and!Regional!Scales! ! Natalia!A.!Rossi!Lafferriere! ! New!world!crocodilians!constitute!a!monophyletic!group!comprising!four!species:! Crocodylus*rhombifer!(Cuban!crocodile),!Crocodylus*acutus!(American! crocodile),!Crocodylus*intermedius!(Orinoco!crocodile),!and!Crocodylus*moreletii! (Morelet’s!crocodile).!All!of!these!are!in!the!IUCN!Red!list!of!Threatened!Species! and!exhibit!geographic!distributions!covering!small!to!widespread!ranges!across! the!Americas!and!insular!Caribbean.!With!the!overarching!goal!of!generating! relevant!information!for!the!conservation!of!endangered!new!world!crocodilians,! this!dissertation!integrates!genetic!and!ecological!information!to!provide!a! context!spanning!a!scale!from!the!species!level!to!specific!populations,!to! analyses!of!mating!systems!and!breeding!strategies!in!Crocodylus.!In!addition,! my!research!applies!tools!of!ecological!inference!to!model!the!influence!of! environmental!factors!and!natural!habitat!disturbances!in!the!reproductive! success!of!Crocodylus*using!a!longWterm!dataset.!This!work!uses!C.*intermedius! and!C.*acutus!as!model!species!to!explore!four!focal!questions!organized!in! distinct!chapters!related!to!the!biology!and!ecology!of!crocodilians.! In!Chapter!I,!I!compare!previously!reported!reproductive!traits!among!C.*acutus! populations!across!its!geographic!range.!This!comparative!analysis!reveals!a! high!degree!of!variability!in!reproductive!traits!across!C.*acutus!range!and! provides!potential!adaptive!explanations!for!the!patterns!observed.!Crocodylus* acutus!appears!to!be!one!of!the!most!adaptable!of!crocodilians!in!terms!of! nesting!requirements,!total!nests!per!breeding!season,!nest!mode!(hole!vs.! mound),!timing!of!eggWlaying,!female!minimum!reproductive!size,!clutch!size,! female!nest!defence!behaviour,!and!female!parental!care.!Besides!regional! comparisons,!this!chapter!focuses!on!the!largest!nesting!population!of!C.*acutus! located!in!southeastern!Cuba,!where!the!species!still!occurs!at!its!natural! population!numbers.!!!! In!Chapter!II,!I!use!molecular!tools!to!elucidate!the!mating!system!of!the!Orinoco! crocodile!in!a!reintroduced!population!in!the!Llanos!of!Venezuela.!Analyzing!17! polymorphic!microsatellite!loci!from!20!clutches!I!found!multiple!paternity!in!C.* intermedius,!with!half!of!the!clutches!fathered!by!two!or!three!males.!Sixteen! mothers!and!14!fathers!were!inferred!by!reconstruction!of!multilocus!parental! genotypes.*Results!showed!skewed!paternal!contributions!to!multipleWsired! clutches!in!four!of!the!clutches!(40%),!leading!to!an!overall!unequal!contribution! of!offspring!among!fathers!with!six!of!the!14!inferred!males!fathering!90%!of!the! total!offspring,!and!three!of!those!six!males!fathering!more!than!70%!of!the!total! offspring.!Results!of!this!chapter!provide!the!first!evidence!of!multiple!paternity! occurring!in!the!Orinoco!crocodile!and!confirm!the!success!of!reintroduction! efforts!of!this!critically!endangered!species!in!Venezuela.! In!Chapter!III,!I!apply!generalized!linear!mixed!models!to!infer!the!effect!of! tropical!cyclones!and!environmental!variability!on!the!nesting!success!of!C.* acutus!in!the!largest!nesting!population!of!the!species!in!southeastern!Cuba!for!a! period!of!21!years.!Results!of!this!chapter!report!the!highestWdensity!nesting!for! the!species!documented!to!date,!and!one!of!the!highest!densities!of!nesting!in! relation!to!other!crocodilian!species,!with!an!average!of!164!nests!per!year!and!a! density!of!17!nests!per!hectare.!Two!of!the!five!analyzed!nesting!sites!had! consistently!higher!nests!and!higher!nesting!success!for!the!whole!21Wyear! period.!Much!of!the!temporal!variation!in!nesting!success!could!be!explained!by! the!occurrence!of!tropical!cyclones.!I!found!that!occurrence!of!tropical!cyclones! within!a!nesting!season!negatively!affected!nesting!success,!whereas!the! occurrence!of!tropical!cyclones!one!or!two!years!before!the!nesting!season! positively!affected!nesting!success.!Additionally,!results!of!this!chapter!suggest! that!higher!ambient!temperature!negatively!affected!nesting!success.!HigherW intensity!tropical!cyclones!are!expected!to!strike!the!coasts!of!Cuba!due!to! climate!change,!potentially!devastating!C.*acutus!nests!if!they!occur!during!the! nesting!season.!As!the!recruitment!of!C.*acutus!populations!in!Cuba!heavily!rely! on!nesting!success,!we!propose!incorporating!information!on!crocodilian’s! nesting!success!and!density,!as!well!as!the!impact!of!tropical!cyclones!on!the! latter,!as!key!components!of!coastal!resilience!when!designing!plans!for!coastal! adaptation!in!the!context!of!climate!change.! In!the!last!chapter,!I!employed!data!on!mitochondrial!DNA!(mtDNA)!control! region!and!12!nuclear!polymorphic!microsatellite!loci!to!assess!the!degree!of! population!structure!of!C.*acutus!between!and!among!localities!in!South! America,!North!America,!Central!America!and!the!Greater!Antilles.!All!analyses! for!both!mtDNA!and!nuclear!markers!show!evidence!of!strong!population!genetic! structure!in!the!American!crocodile,!with!unique!populations!in!each!of!the! sampling!localities.!My!research!results!reinforce!previous!findings!showing!the! greatest!degree!of!genetic!differentiation!between!the!continental!C.*acutus!and! the!Greater!Antillean!C.*acutus.*Three!new!haplotypes!unique!to!Venezuela!were! reported.!These!were!considerably!less!distant!from!Central!and!North!American! haplotypes!than!Greater!Antillean!haplotypes.!Overall!evidence!of!this!chapter! suggests!that!Cuban!and!Jamaican!C.*acutus!share!a!mtDNA!haplotype!but! currently!represent!at!least!two!different!genetic!populations!when!using!nuclear,! faster!evolving,!microsatellite!markers.!Findings!of!this!chapter!offer!the!first! evidence!of!genetic!differentiation!among!the!populations!of!Greater!Antillean!C.* acutus,!the!first!ever!reported!haplotypes!for!the!species!in!Venezuela,!and! provide!important!information!for!the!regional!planning!and!inWsitu!conservation!of! the!species.!! In!conclusion,!research!findings!of!my!dissertation!are!the!product!of!combining! ecological!data!collected!in!the!field,!genetic!data!generated!in!the!lab,!and!the! use!of!a!suite!of!classic!and!inferenceWbased!methodological!approaches!to!gain! a!better!understanding!of!the!behavior!and!evolution!of!crocodilians.!The! dissertation!presents!the!first!genetic!research!on!C.*intermedius,*shows!the! importance!of!coastal!mangrove!conservation!for!the!persistence!of!C.*acutus!in! Cuba,!and!depicts!phylogeographic!linkages!among!distinct!C.*acutus! populations!across!the!Americas!and!Greater!Antilles.!The!outcomes!of!this! research!provide!scienceWbased!information!to!influence!decisionWmaking! processes!for!the!conservation!of!threatened!crocodilians!and!their!habitats! across!the!study!areas.! ! ! TABLE!OF!CONTENTS! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Page! ! LIST!OF!TABLES!....................................................................................................!iii! ! LIST!OF!FIGURES!..................................................................................................!v! ! ACKNOWLEDGEMENTS!........................................................................................!vi! ! DEDICATION!..........................................................................................................!xi! ! INTRODUCTION!.....................................................................................................!1! Integration!of!ecological!and!evolutionary!approaches!for!the! conservation!of!endangered!crocodilians!...............................................!1!! References!.............................................................................................!8! ! CHAPTER!I:!INTRASPECIFIC!VARIATION!IN!THE!REPRODUCTIVE! ECOLOGY!OF!THE!AMERICAN!CROCODILE!(CROCODYLUS*ACUTUS)! ACROSS!LOCAL!AND!REGIONAL!SCALES!.........................................................!18! Introduction!............................................................................................!18! Local!comparisons!.................................................................................!24! Regional!comparisons!............................................................................!29! Summary!................................................................................................!36! References!.............................................................................................!39! ! CHAPTERII:!MULTIPLE!PATERNITY!IN!A!REINTRODUCED!POPULATION!OF! THE!ORINOCO!CROCODILE!(CROCODYLUS*INTERMEDIUS)!AT!THE!EL! FRÍO!BIOLOGICAL!STATION,!VENEZUELA!.........................................................!57! Abstract!..................................................................................................!57! Introduction!............................................................................................!58! Materials!and!methods!...........................................................................!62!
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  • Characterization and Prediction of Deep Learning Workloads in Large-Scale GPU Datacenters

    Characterization and Prediction of Deep Learning Workloads in Large-Scale GPU Datacenters

    Characterization and Prediction of Deep Learning Workloads in Large-Scale GPU Datacenters Qinghao Hu1,2 Peng Sun3 Shengen Yan3 Yonggang Wen1 Tianwei Zhang1∗ 1School of Computer Science and Engineering, Nanyang Technological University 2S-Lab, Nanyang Technological University 3SenseTime {qinghao.hu, ygwen, tianwei.zhang}@ntu.edu.sg {sunpeng1, yanshengen}@sensetime.com ABSTRACT 1 INTRODUCTION Modern GPU datacenters are critical for delivering Deep Learn- Over the years, we have witnessed the remarkable impact of Deep ing (DL) models and services in both the research community and Learning (DL) technology and applications on every aspect of our industry. When operating a datacenter, optimization of resource daily life, e.g., face recognition [65], language translation [64], adver- scheduling and management can bring significant financial bene- tisement recommendation [21], etc. The outstanding performance fits. Achieving this goal requires a deep understanding of thejob of DL models comes from the complex neural network structures features and user behaviors. We present a comprehensive study and may contain trillions of parameters [25]. Training a production about the characteristics of DL jobs and resource management. model may require large amounts of GPU resources to support First, we perform a large-scale analysis of real-world job traces thousands of petaflops operations [15]. Hence, it is a common prac- from SenseTime. We uncover some interesting conclusions from tice for research institutes, AI companies and cloud providers to the perspectives of clusters, jobs and users, which can facilitate the build large-scale GPU clusters to facilitate DL model development. cluster system designs. Second, we introduce a general-purpose These clusters are managed in a multi-tenancy fashion, offering framework, which manages resources based on historical data.