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Sclérochronologie et géochimie des bivalves de l'Atlantique Nord-Ouest : exploration de traceurs environnementaux des changements globaux

2020· dissertation· W7150890242 on OpenAlexaboutno aff
Justine Doré

Bibliographic record

Venuenot available
Typedissertation
Language
FieldEarth and Planetary Sciences
TopicGeology and Paleoclimatology Research
Canadian institutionsnot available
Fundersnot available
KeywordsAquatic environmentCoastal zoneWestern europe

Abstract

fetched live from OpenAlex

Les changements globaux issus des activités anthropiques ont d’importantes répercussions sur les régions côtières notamment dans l’Atlantique Nord-Ouest et le système Saint-Laurent (Québec, Canada). Le développement d’outils d’analyse et d’enregistrement pour reconstruire les variations environnementales pré-instrumentales est nécessaire pour comprendre ces changements. Ce travail de doctorat utilise la sclérochronologie et la sclérochimie dans le but d’explorer la capacité de trois espèces de mollusques bivalves subarctiques (Arctica islandica, Cyrtodaria siliqua et Mactromeris polynyma) à archiver les variations de leur environnement sous forme physique (croissance) et géochimique (éléments traces et isotopes), et de développer des traceurs environnementaux robustes et fiables. Les espèces étudiées ont notamment permis de retracer la dynamique phytoplanctonique et le climat de l’Atlantique Nord-Ouest. Cette thèse démontre le potentiel des espèces, comme archives biogéniques et eulériennes haute-fréquence des variations de l’environnement côtier de l’estuaire maritime du Saint-Laurent et de l’Atlantique Nord-Ouest et souligne l’intérêt de favoriser une approche multi-archives et multi-traceurs.

Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.

How this classification was reachedexpand

Full frame machine prediction

Teacher imitation

Not calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.

metaresearch head score (Codex)0.000
metaresearch head score (Gemma)0.000
Version: metacan-v3-hybrid-931329e0061cValidation status: machine_predicted_unvalidated
Candidate categoriesnone
Consensus categoriesnone
DomainCandidate signal: none · Consensus signal: none
Study designCandidate signal: Observational · Consensus signal: Observational
GenreCandidate signal: Other · Consensus signal: none
Teacher disagreement score0.665
Threshold uncertainty score0.673

Distilled classifier scores by category (both heads)

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0010.002
Science and technology studies0.0010.001
Scholarly communication0.0010.000
Open science0.0000.001
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0020.000

Machine scores (provisional)

The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.

Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.

Opus teacher head0.098
GPT teacher head0.335
Teacher spread0.238 · how far apart the two teachers sit on this one work
Validation statusscore_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it

Classification

machine, unvalidated

Machine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.

The models applied no category: nothing in the taxonomy fit this work.
Study designObservational
Domainnot available
GenreOther

How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".

Quick stats

Citations0
Published2020
Admission routes1
Has abstractyes

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