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26 results for “herbarium studies”
Can Artificial Intelligence help in the study of vegetative growth dynamics from herbarium collections? An evaluation of the tropical flora of the French Guiana forest
<p>Dataset was used for the article "Can Artificial Intelligence help in the study of vegetative growth dynamics from herbarium collections? An evaluation of the tropical flora of the French Guiana forest".</p> <p>The related work proposes to study to what extent the use of automated visual analysis techniques, based on deep learning, can help not only to detect relatively rare vegetative structures in herbarium collections but also to automatically classify them by type of growing shoot (continuous or rhythmic).</p> <p>Abstract of the paper:</p> <p>A better knowledge of tree vegetative growth patterns and their relationship to environmental variables is crucial in understanding forest growth dynamics and how climate change may affect them. Generally less studied than reproductive structures, the phenology of tree vegetative growth mainly focuses on the analysis of growing shoots, from vegetative buds development to leaf fall. This growth process usually strongly differs between temperate and tropical regions. In temperate regions, this pattern is quite well known. Low winter temperatures impose a stop of the vegetative growth shoots and lead to the typical expression of an annual growth cycle for the vast majority of tree species. In moist tropical regions, on the other hand, the seasonality is much less marked. In addition, these regions contain a much wider variety of tree species. These two aspects lead to a tremendous diversity of phenological patterns that are still poorly known and understood. In particular, not much is known on the periodicity and timing of growth at individual trees, population, or community levels.</p> <p>The work carried out in this study aims to advance knowledge in this area, focusing more particularly on herbarium scans, as herbarium collections offer the promise of monitoring plant phenology over long time periods. However, such a study requires the ability to detect a sufficiently large number of growing shoots in herbarium collections to draw statistically relevant conclusions, which can be very costly if the work is done manually. Furthermore, herbarium collections traditionally focus on reproductive organs, and herbarium specimens showing growing shoots are pretty rare.</p> <p>We propose in this paper to study to what extent the use of automated visual analysis techniques, based on deep learning, can help not only to detect these relatively rare vegetative structures in herbarium collections but also to automatically classify them by type of growing shoot (continuous or rhythmic). Our results show the relevance of using herbarium data for vegetative phenology research, as well as the potential of deep learning approaches for growth shoot detection.</p>
FIG. 2 in Contribution of French explorers to the study of Middle Asian flora: the herbarium collections by Guillaume Capus (1857-1931)
FIG. 2. — Travel route of Guillaume Capus and Gabriel Bonvalot in Middle Asia, 1880-1882 (Bonvalot 1884).
FIG. 1. — A in Contribution of French explorers to the study of Middle Asian flora: the herbarium collections by Guillaume Capus (1857-1931)
FIG. 1. — A, Guillaume Capus (Chevalier 1931), source Gallica (https://gallica.bnf.fr/ark:/12148/btv1b8450852x); B, Gabriel Bonvalot (Bibliothèque nationale de France, département Société de Géographie, SG PORTRAIT-10135).
FIG. 6. — Oxytropis tatarica Hook.f in Contribution of French explorers to the study of Middle Asian flora: the herbarium collections by Guillaume Capus (1857-1931)
FIG. 6. — Oxytropis tatarica Hook.f. & Thomson ex Bunge; collection by Guillaume Capus housed at the P Herbarium, G. Capus 365 (P[P02914846]).
FIG. 5 in Contribution of French explorers to the study of Middle Asian flora: the herbarium collections by Guillaume Capus (1857-1931)
FIG. 5. — Distribution of herbarium specimens collected by Capus in Middle Asia, following the current countries.
FIG. 4 in Contribution of French explorers to the study of Middle Asian flora: the herbarium collections by Guillaume Capus (1857-1931)
FIG. 4. — Collection density map based on Capus' herbarium specimens from the Middle Asia (1880-1882).
FIG. 3 in Contribution of French explorers to the study of Middle Asian flora: the herbarium collections by Guillaume Capus (1857-1931)
FIG. 3. — Species diversity map based on Capus' herbarium specimens from the Middle Asia (1880-1882).
Linked collectors and determiners for: Contribution of French explorers to the study of Middle Asian flora: the herbarium collections by Guillaume Capus (1857 - 1931).
Natural history specimen data linked to collectors and determiners held within, "Contribution of French explorers to the study of Middle Asian flora: the herbarium collections by Guillaume Capus (1857 - 1931)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/bf81983a-101e-4e6b-af21-ef6a9359f7f0">https://bionomia.net/dataset/bf81983a-101e-4e6b-af21-ef6a9359f7f0</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/bf81983a-101e-4e6b-af21-ef6a9359f7f0">https://gbif.org/dataset/bf81983a-101e-4e6b-af21-ef6a9359f7f0</a>. Formatted as a Frictionless Data package.
FIG. 6 in Saint-Hilaire virtual herbarium, a new upgradeable tool to study Brazilian botany
FIG. 6. — Result of a search. Several parts are clickable, field book and specimen images for consultation, barcode for Paris Museum site and collection number.
FIG. 4 in Saint-Hilaire virtual herbarium, a new upgradeable tool to study Brazilian botany
FIG. 4. — Saint-Hilaire virtual herbarium presentation. Example of the collection Saint-Hilaire C2-1272, with the field book page and both known vouchers.
FIG. 2 in Saint-Hilaire virtual herbarium, a new upgradeable tool to study Brazilian botany
FIG. 2. — Operations with the virtual herbarium interface. It is possible to select the name, collection number or barcode. The collection shows two specimens and a description.
FIG. 1 in Saint-Hilaire virtual herbarium, a new upgradeable tool to study Brazilian botany
FIG. 1. — Auguste de Saint-Hilaire (1779-1851), a few years after his trip to Brazil. (Photo, F. Bouazzat, MNHN).
Fig. 5. – Sheet number 39 in Study of a pre-Linnaean herbarium attributed to Francesco Cupani (1657-1710)
Fig. 5. – Sheet number 39 of the Cupani Herbarium containing one specimen of Rosa L. (Rosaceae).
Fig. 6. – Sheet number 17 in Study of a pre-Linnaean herbarium attributed to Francesco Cupani (1657-1710)
Fig. 6. – Sheet number 17 of the Cupani Herbarium.
Fig. 1 in Study of a pre-Linnaean herbarium attributed to Francesco Cupani (1657-1710)
Fig. 1. – Spine and inventory label of the Cupani Herbarium.
Fig. 3. – Sheet number 6 in Study of a pre-Linnaean herbarium attributed to Francesco Cupani (1657-1710)
Fig. 3. – Sheet number 6 of the Cupani Herbarium.
Fig. 4 in Study of a pre-Linnaean herbarium attributed to Francesco Cupani (1657-1710)
Fig. 4. – First page of the index of the Cupani Herbarium.
Fig. 7. – Sheet number 1 in Study of a pre-Linnaean herbarium attributed to Francesco Cupani (1657-1710)
Fig. 7. – Sheet number 1 of the Cupani Herbarium.
Fig. 2 in Study of a pre-Linnaean herbarium attributed to Francesco Cupani (1657-1710)
Fig. 2. – Title page of the Cupani Herbarium.
FIG. 7 in Saint-Hilaire virtual herbarium, a new upgradeable tool to study Brazilian botany
FIG. 7. — Results for collection number.
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