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Record W7019374996

Genetic analysis of «Pardosa» wolf spiders (Aranae: Lycosidae) across the northern Nearctic

2013· dissertation· en· W7019374996 on OpenAlexfundno aff

Bibliographic record

VenueeScholarship@McGill (McGill) · 2013
Typedissertation
Languageen
FieldBiochemistry, Genetics and Molecular Biology
TopicSpider Taxonomy and Behavior Studies
Canadian institutionsnot available
FundersNatural Sciences and Engineering Research Council of CanadaAssociation of Canadian Universities for Northern Studies
KeywordsGenetic analysisNearctic ecozonePopulation geneticsStatistical analysisGenetic variation
DOInot available

Abstract

fetched live from OpenAlex

An analysis of the genetic structure of northern Nearctic wolf spiders from the genus Pardosa (Lycosidae) was conducted.Wolf spiders are common and abundant across the Nearctic, but despite their ecological importance, little is known about their phylogeography and taxonomically uncertain species exist.Wolf spiders were collected from sites across northern Canada to examine the phylogeographic history of Pardosa glacialis (Thorell) and taxonomic status of the Nearctic members of the Pardosa lapponica species-group.Results show that the high Arctic species P. glacialis occupied two major glacial refugia during the Wisconsin glaciation: Beringia and a lesser-known high Arctic refugium.Additionally, analyses support a P. glacialis population expansion in Beringia during the Wisconsin glaciation, likely facilitated by an increase in habitat due to suitable climate in the region.Post-glacial dispersal from the Beringian and high Arctic refugia produced a secondary contact zone in central high Arctic Canada.With regards to taxonomy, morphometric analyses of P. lapponica (Thorell) and P. concinna (Thorell), the only two members of the P. lapponica species-group in the Nearctic, revealed no species-specific variation beyond a single male morphological character.Genetic analyses showed there was more genetic variation between Palearctic and Nearctic P. lapponica specimens than between Nearctic P. lapponica and P. concinna specimens.The P. lapponica speciesgroup is in need of taxonomic revision to resolve the species boundaries among its members.iii Résumé Une analyse de la structure génétique des Lycoses néarctiques du Grand Nord appartenant au genre Pardosa (Lycosidae) a été effectuée.Les Lycoses sont des espèces communes et abondantes dans le néarctique.Malgré leur importance écologique, peu d'information est disponible sur leur phylogéographie et l'identité taxonomique de certaines espèces n'est pas clairement établie.Dans le contexte de cette étude, nous avons recueilli des Lycoses dans le nord du Canada afin d'étudier l'histoire phylogéographique de Pardosa glacialis (Thorell) et d'établir le statut taxonomique des membres néarctiques du groupe d'espèces Pardosa lapponica.D'après nos résultats, l'espèce arctique P. glacialis aurait autrefois occupé deux importants refuges lors de la glaciation du Wisconsin : la Béringie et un refuge situé dans le Haut-Arctique.Les analyses appuient une expansion de la population de P. glacialis en Béringie pendant la glaciation wisconsinienne, une situation vraisemblablement favorisée par une augmentation de l'habitat disponible grâce à un climat adéquat.La dispersion postglaciaire des espèces à partir de ces refuges a créé une zone de contact secondaire, située dans le centre du Haut-Arctique canadien.Par rapport au statut taxonomique, une étude morphométrique de P. lapponica (Thorell) et P. concinna (Thorell), les deux seules espèces membres du groupe P. lapponica dans le Néarctique, n'a dévoilé aucune variation discriminante, mis à part un caractère morphologique chez les mâles.L'analyse des caractères génétiques a démontré qu'il n'y a pas plus de variation entre les spécimens paléarctiques et néarctiques de P. lapponica qu'entre les spécimens de P. lapponica et P. concinna provenant exclusivement du Néarctique.Une révision taxonomique du groupe d'espèces P. lapponica qui réexaminerait les limites interspécifiques entre les membres de ce groupe est nécessaire.

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: Empirical · Consensus signal: Empirical
Teacher disagreement score0.056
Threshold uncertainty score0.111

Distilled classifier scores by category (both heads)

CategoryCodexGemma
Metaresearch0.0000.000
Meta-epidemiology (narrow)0.0000.000
Meta-epidemiology (broad)0.0000.000
Bibliometrics0.0010.001
Science and technology studies0.0010.000
Scholarly communication0.0000.000
Open science0.0000.000
Research integrity0.0000.000
Insufficient payload (model declined to judge)0.0010.000

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 head0.015
GPT teacher head0.262
Teacher spread0.247 · 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
GenreEmpirical

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
Published2013
Admission routes1
Has abstractyes

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