Paleobotany PhD: Comparing Paleozoic Wood Anatomy and Exploring Its Water-Transport Capacity

Paleobotany PhD: Comparing Paleozoic Wood Anatomy and Exploring Its Water-Transport Capacity

Quick Decision

Recommendation label: Strong but verify fit. This is a defined, testable paleobotany doctorate: the main work quantifies how wood anatomy varied across time and plant groups, then tests whether early woody plants quickly developed a wider range of anatomical designs and whether Paleozoic woods had character combinations no longer seen today. A smaller, explicitly exploratory workstream links anatomy to hydraulic conductivity. The narrow subject still connects to plant evolution, deep-time ecosystem function and trait-based research; it should not be dismissed because it is specialized.

As of 8 November 2026, the CNRS hiring page marks the post “New” and gives a deadline of 27 November 2026 at 23:59, but does not state a time zone. A second official vacancy record labels the time UTC and says basic French; the CNRS qualification text asks for good written and spoken English but sets no French level. The second record also shows an expired status despite the future deadline. Confirm the live CNRS portal status, deadline zone and whether French is an eligibility requirement before relying on either disputed field. The hiring page is the clearest current statement of the offer itself. CNRS hiring page

The main attraction is the close match between the research question and the resources named for the post: Montpellier collections with more than 2,000 prepared sections, paleobotany and microscopy facilities, supplementary Paris material, some existing synchrotron images, and regular advisor meetings. The offer states a 36-month, full-time fixed-term contract beginning 1 February 2027 and at least €2,300 gross monthly pay. The key practical uncertainty is cost coverage: the University lists a €398 doctoral registration fee for 2026–27 and the national student contribution is €105 if payable, while the employer page does not say whether either amount is covered or which registration category applies.

Best matched backgrounds: a relevant Master’s degree plus substantial plant anatomy, histology, botany and/or paleobotany preparation, and confidence working with comparative data. Paleontology is desirable, not mandatory. The useful immediate action is to prepare the specified 1–2 page CV and 1–2 page cover letter, then ask CNRS/GAIA to resolve the deadline, French and fee questions early enough to submit comfortably before the closing date.

Research Problem and Doctoral Work

Wood is abundant in the fossil record, but its functional properties across geological time remain much less documented than its occurrence and taxonomy. The PALWOOD project (2026–2030) combines plant paleodiversity and paleophysiology over the rise of wood in the early Devonian, around 410 million years ago, through the end-Permian plant crisis, around 250 million years ago. This doctorate focuses on homoxylous wood—wood without vessels—and asks whether anatomical disparity rose quickly after wood appeared, and whether Paleozoic plants developed combinations of anatomical characters that have no living equivalent. Here “disparity” concerns the range of anatomical designs, rather than simply the number of species. CNRS hiring page

The core work is to define useful quantitative and qualitative characters, build and populate a comparative database from thin-section observations, and compare anatomical diversity across taxa and geological periods. The intended sample spans Paleozoic, Mesozoic and Cenozoic woods, although Paleozoic material is the focus of the hypotheses. The advert does not specify the database schema, exact sample count, time bins, disparity statistics or treatment of uneven preservation. Those decisions will shape how strongly the two hypotheses can be tested and are worth discussing at interview.

A second workstream is more exploratory. The student would estimate and compare hydraulic conductivity in several Paleozoic stems, using thin sections and synchrotron images, then apply an existing AMAP model to selected taxa, especially Devonian examples. The model paper extends a circuit analogy from individual tracheids to tissue-level transport through tracheids and rays. Further model development is only mentioned “if time permits”; it should not be treated as a guaranteed thesis deliverable. A 2024 review of fossil-plant functional traits identifies hydraulic conductivity as promising while emphasizing the limits imposed by taphonomic alteration, fragmentary preservation and incomplete model inputs. These are scientific constraints to design around, not reasons to reject the question. Functional-traits review, AMAP hydraulic model paper

The proposed research has a credible empirical base: the job page names Montpellier’s Devonian–Permian woody-stem collections, more than 2,000 prepared sections or peels, laboratory microscopy and sample-preparation capacity, and additional Mesozoic/Cenozoic specimens in Paris. Some synchrotron images already exist; others are expected during the project. Field collection is possible rather than guaranteed. The work also sits within a collaboration among AMAP in Montpellier, CR2P in Paris and EEP in Lille, with international collaborators. Access is stated, but the sequence, volume, travel budget and beamtime schedule are not. CNRS hiring page, AMAP synchrotron paleobotany project

School, Programme and Field Context

The employer is CNRS, the research host is AMAP (UMR 5120) in Montpellier, and the stated doctoral-school affiliation is GAIA at the University of Montpellier. The University of Montpellier is the named doctoral registration and degree route; CNRS is the employer. The offer does not describe a joint degree. University rules state that doctoral enrollment is authorized by the University president after recommendation from the doctoral-school director and consultation with the thesis advisor and research-unit director. A doctorate normally requires three years of full-time equivalent research, which aligns with the 36-month employment term. The named GAIA tracks include “Ecology, Evolution, Genetic Resources, Paleobiology,” a close training context for this project. Confirm which advisor will hold the formal thesis-director role and when enrollment must be completed. University doctoral training and registration

AMAP is a multidisciplinary research unit involving the University of Montpellier, CNRS, CIRAD, INRAE and IRD. Its work spans plant form and function, plant diversity, systematics and modeling. These partner roles describe the unit’s governance and research environment; they do not establish additional degree-awarding institutions for this post. The job assigns the student to the Biodiversity and Plant Architecture and Functioning groups. AMAP at the University of Montpellier, AMAP at CIRAD

For broad institutional context, the University’s 2026 ARWU overall position is in the 151–200 band. ShanghaiRanking’s 2026 subject table places the University at #9 in Ecology; this is adjacent subject-level evidence, not a paleobotany rank or a measure of this project’s quality. The direct indicators for this doctorate are the group’s relevant fossil-plant work, collection access and microscopy/modeling resources. University 2026 ranking notice, ShanghaiRanking University of Montpellier profile

Supervisor and Lab Assessment

The CNRS offer names A. Boura and A.-L. Decombeix as thesis advisors. Decombeix is a CNRS researcher in AMAP and leads the unit’s SYSTE line in plant systematics and biogeography, including living and fossil plants. AMAP lists anatomy/microscopy and experimental services, a dedicated support team and facilities relevant to specimen observation and preparation. Its earlier HYDRO-PAL work examined hydraulic conductance in early woody Devonian and Carboniferous trees, making the project’s modeling component a continuation of an established line rather than a disconnected add-on. The advertised access to specimens and regular formal meetings at least every 15 days are unusually concrete support details; confirm the supervisory split and practical schedule with both advisors. AMAP research axes, AMAP experimental services, HYDRO-PAL

Recent papers show how the team links careful fossil anatomy to broader evolutionary and functional questions:

• Decombeix and colleagues documented tyloses in Late Devonian Callixylon wood, showing that early woody trees could occlude individual water-conducting cells. This is a direct example of a functional feature inferred from preserved anatomy, while a single feature does not establish whole-plant conductivity. Nature Plants, 2023
• Meyer-Berthaud and colleagues described anatomically preserved Middle Devonian euphyllophytes from the eastern Anti-Atlas in Morocco. The paper illustrates the group’s work on taxonomic comparison and fossil-plant diversity across Gondwanan settings; it does not itself answer the dissertation’s wood-disparity hypotheses. Geobios, 2024
• Decombeix, Hiller and Bomfleur analyzed a Triassic Antarctic conifer using peel sections and more than 100 growth rings. They inferred that the tree’s slow growth reflected local stress even though regional conditions were favorable, showing the value of separating organism-level anatomy from broader environmental context. Annals of Botany, 2025

The combination of expertise, archived material and methods supports the project’s feasibility. Remaining uncertainties are operational: the number of taxa/sections available to this thesis, how specimen access is divided across institutions, imaging and travel budgets, and how the main disparity analyses will be scoped within three years.

Funding, Application, and Living Cost

This is a paid CNRS fixed-term doctoral job, not an unfunded topic: one full-time 36-month contract, starting 1 February 2027, with at least €2,300 gross per month. CNRS also lists 44 annual leave/RTT days, reimbursement of 75% of transport cost and a sustainable-mobility allowance up to €300. The stated minimum matches the French statutory doctoral-contract minimum effective from 1 January 2026. Gross pay is before payroll deductions and should not be read as monthly take-home pay. CNRS hiring page, 2026 minimum-remuneration order

The University of Montpellier lists €398 as the doctoral registration fee for 2026–27. The national government lists the 2026–27 CVEC at €105 for students who are liable. The University says doctoral students in initial training are normally subject to the CVEC, while doctoral students in continuing education funded by an employer or funding body are not. The job description does not identify the student’s registration category, say who pays the tuition fee, or confirm whether the CVEC is due or reimbursed. Do not assume the contract automatically covers either charge; ask CNRS HR and GAIA for the exact classification and payer, including whether the fee recurs on annual registration. University fee and CVEC rules, 2026–27 CVEC amount

A Paul-Valéry Montpellier university guide gives an indicative student budget of about €950 per month, including rent commonly estimated at €450–700, utilities around €35 and food around €200. This is a student benchmark, not a budget study of employed doctoral researchers. A government student-housing portal lists CROUS studios in the Occitanie residence from €294 to €522 including charges, but availability is not guaranteed. Montpellier Métropole residents can obtain a free public-transport pass with proof of residence; non-residents need a paid ticket. Housing cost and eligibility for transport savings therefore matter more than comparing gross salary directly with a student estimate. Montpellier student budget, CROUS residence listing, Montpellier Métropole free pass

The stated application packet is a detailed 1–2 page CV listing internship titles, locations and supervisors and Master’s 1 and 2 grades, plus a 1–2 page cover letter describing (paleo)botany experience and motivation for doctoral study. Shortlisted candidates are expected to interview online in December with the project leaders and two external researchers. The post requires travel to collections and conferences and may include fieldwork, with accommodations possible for personal constraints. CNRS hiring page

Applicant Fit and Preparation

Required by the employer: a Master’s degree in a relevant field such as organismal biology, evolutionary biology, or ecology and evolution; a strong background in paleobotany and/or botany and plant histology; good written and spoken English; teamwork; integrity; and scientific rigor. Desirable, not required: paleontology, which the advert says can be learned during the dissertation. The job text does not name a programming language, database platform or prior synchrotron experience as a condition, so these should not be presented as formal prerequisites. CNRS hiring page

Applicants can strengthen the match by making relevant evidence easy to find: plant tissue or wood anatomy, microscope work, character description/coding, fossil or herbarium collections, comparative analysis, data organization, research writing and collaboration. These are preparation suggestions derived from the advertised tasks, not additional eligibility rules. A brief, feasible description of how prior work handled sampling, repeatable character definitions or uncertainty would be useful in the letter or interview; no full research proposal is requested in the stated packet.

The basic-French field in a second official record remains unresolved against the employer’s written criteria. Ask whether it is an actual screening condition, an administrative field or simply an informational label. Also ask whether French is needed for day-to-day administration or doctoral training even if it is not an employment requirement.

Next Actions and Questions to Verify

Before Applying

• Confirm with CNRS that the vacancy remains open, whether 27 November 2026 at 23:59 is local French time or UTC, and which timestamp the application portal enforces.
• Ask whether basic French is required for selection, employment or doctoral registration; request the accepted evidence or level if so.
• Confirm whether the €398 2026–27 registration fee is paid by the student, CNRS or another project budget, and how the student is classified for CVEC purposes. The government lists €105 for 2026–27 when payable, but the University’s rules allow some employer-funded continuing-education doctoral students not to be liable.
• Submit the CV and letter via the CNRS portal, showing internship details and M1/M2 grades and directly describing relevant plant anatomy/paleobotany experience.

At Interview

• Which advisor will be the formal GAIA thesis director, and which partners will supervise or host work at AMAP, CR2P and EEP?
• How will “disparity” be operationalized, which taxa and geological bins will be sampled, and what is the minimum viable database and analysis if specimen access or imaging is delayed?
• What synchrotron images and beamtime are secured, how will hydraulic-model outputs be validated, and what proportion of the thesis is expected to use the exploratory hydraulic workstream?
• What travel, collection visits, fieldwork and conference attendance are expected, and which costs are covered by the project?

Before Accepting an Offer

• Obtain written confirmation of salary, take-home-pay estimate, contract dates and annual registration/fee arrangements.
• Confirm first-year enrollment timing and the University’s formal director/supervisor assignment, including any additional approval needed for an international Master’s qualification.
• Confirm the project’s travel and research-cost budget and plan housing early; neither access to a CROUS room nor the resident transport pass is automatic.

Evidence and Sources

Project, Institutional and Training Sources

• CNRS vacancy and employment terms
• University of Montpellier doctoral training, GAIA and registration
• AMAP at the University of Montpellier
• AMAP at CIRAD
• AMAP research axes and SYSTE group
• AMAP experimental services
• CNRS UMR 5120 unit page
• HYDRO-PAL project
• AMAP synchrotron-paleobotany collaboration

Ranking, Supervisor and Research Sources

• University of Montpellier 2026 Shanghai ranking notice
• ShanghaiRanking 2026 profile and subject results
• Anne-Laure Decombeix publication record
• Nature Plants: Late Devonian tyloses, 2023
• Geobios: Middle Devonian Moroccan plant assemblage, 2024
• Annals of Botany: Triassic Antarctic conifer, 2025
• New Phytologist review of fossil-plant functional traits, 2024
• Hydraulic transport model for fossil plants, 2019
• Silicified Pennsylvanian wood from the Pyrenees, 2023
• Re-investigation of Stauroxylon beckii, 2024

Funding, Costs and Career Sources

• French 2026 doctoral-contract minimum remuneration order
• Ministry overview of doctoral funding and contracts
• Government 2026–27 CVEC amount
• Paul-Valéry University’s Montpellier student budget guide
• Government student-housing listing for the Occitanie residence
• Montpellier Métropole public-transport pass
• French three-year PhD employment outcomes, SIES
• French government career profile: paleontologist