Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
513
datasets available to search
ShareScore release 0.9.0
Dataset results
513 results for “southern Mexico”
Data from: Limitations to recovery following wildfire in dry forests of southern Colorado and northern New Mexico, USA
Climate warming is contributing to increases in wildfire activity throughout the western U.S., leading to potentially long-lasting shifts in vegetation. The response of forest ecosystems to wildfire is thus a crucial indicator of future vegetation trajectories, and these responses are contingent upon factors such as seed availability, interannual climate variability, average climate (e.g., 30-year normals), and other components of the physical environment. To better understand variation in forest resilience to fire across vulnerable dry forests, we performed field surveys of conifer seedling abundance in 15 recent (1988-2010) wildfires and characterized temporal variation in seed cone production and seedling establishment. We then modeled post-fire seedling abundances for each species at a 30 m resolution using downscaled climate data, monthly water balance models, and canopy cover of surviving mature conifers. Widespread ponderosa pine (Pinus ponderosa) seed cone production occurred at least twice following each fire surveyed and pulses of conifer seedling establishment coincided with years of above-average moisture availability. Ponderosa pine and Douglas-fir (Pseudotsuga menziesii) seedling abundances were higher on more mesic sites and adjacent to surviving trees, though there were also important interspecific differences, likely attributable to drought- and shade-tolerance. We estimated that 41.8% (for ponderosa pine) and 68.5% (for Douglas-fir) of the total area burned did not meet tree density thresholds consistent with historical densities for each species. Spatial models demonstrated that the availability of seed trees (particularly in the interior of large, high-severity patches) limited seedling abundances in many areas, but 30-year average actual evapotranspiration and climatic water deficit also limited abundances on marginal sites. A better understanding of the limitations to post-fire recovery is likely to aid in developing adaptation and mitigation strategies through the improvement of models of future ecosystem change throughout the western U.S.
Data from: Tropical tree species diversity in a mountain system in southern Mexico: local and regional patterns and determinant factors
Mechanisms explaining patterns of biodiversity along elevation gradients in tropical mountain systems remain controversial. We use a set of climatic, topographic and soil variables encompassing regional, landscape and local-level spatial scales to explain the spatial variation of tree species diversity in the Sierra Madre of Chiapas, Mexico. We sampled 128 circular plots (0.1-ha each) in four elevational bands along four elevation gradients or transects encompassing 100-2200 m. A total of 12,533 trees belonging to 444 species were recorded. Diversity patterns along the elevation gradient and the explanatory power of independent variables were dependent on spatial scale (regional vs transect) and functional group (total vs late-successional or pioneer species). Diversity of all species and late-successional species (1 - proportion of pioneer species) showed a constant pattern at the regional and transect scales, with low predictive power of climatic variables and/or elevation. A linear decrease of either number or proportion of pioneer species diversity was observed with increasing elevation, which was correlated with temperature, rainfall, and human disturbance trends. Total species diversity showed an increase with rainfall of the warmest quarter, indicating a regional-level limiting effect of seasonality (drought duration). Yet the explanatory power of climatic and topographic variables was higher at the individual transect level than at the regional scale, suggesting the parallel but differential influence of evolutionary and geological history factors on diversification not so far studied to explain elevation patterns of species diversity in tropical mountain systems.
Data from: Tree species diversity alters plant defence investment in an experimental forest plantation in Southern Mexico
The effects of plant species diversity on plant traits conferring herbivore resistance (e.g., chemical defences), as well as the mechanisms underlying such effects, have received little attention. One potential mechanism for diversity effects on plant defences is that increased plant growth at high diversity could lead to reduced investment in defences via growth-defence trade-offs. We measured tree growth (diameter at breast height) and collected leaves for quantification of total phenolics on 2.5-year old plants of six tropical tree species (N = 597 plants) in a young experimental plantation in southern Mexico. Selected plants were distributed across 23 plots (21 x 21 m each) classified as monocultures of one species (N = 13, 2-3 plots per species) or polycultures (N = 10) represented by mixtures of four out of the six species. We found a significant negative effect of tree species diversity on total phenolics, where polycultures exhibited a 13 percent lower mean concentration than monocultures. However, there was marked variation among tree species in diversity effects on defences, where some species exhibited strong reductions in phenolics in mixtures, whereas others were unresponsive. Further, we found no effect of tree species diversity on growth and results indicated that the negative effect of diversity on chemical defences was not mediated by a growth-defence trade-off. These results demonstrate that tree diversity can alter investment in chemical defences in long-lived tree species, which has important implications for predicting effects on consumers and ecosystem function.
Figure 7 in A bloom of the green worm Phyllodoce tuberculosa Kudenov, 1975 in a beach of the Southern Gulf of California, Mexico (Annelida, Errantia, Phyllodocidae)
Figure 7. Preserved specimens of Phyllodoce tuberculosa. (a) Anterior end, oblique dorsal view; (b) prostomium and nuchal papillae; (c) tubercles in mid-body segments (indicated by arrows); (d) parapodium from anterior segment; (e) parapodium from mid-body segment; (f) parapodium from a posterior segment. (a) Live specimen; (b–f) fixed specimen; (b) stained with Shirlastain-A; (c–e) unstained. Scale bars: a = 1 mm; b–c = 0.5 mm; d–f = 0.4 mm.
Figure 3 in A bloom of the green worm Phyllodoce tuberculosa Kudenov, 1975 in a beach of the Southern Gulf of California, Mexico (Annelida, Errantia, Phyllodocidae)
Figure 3. Micrographs of live, relaxed specimens of Phyllodoce tuberculosa in dorsal view. (a) Worm with pharynx not everted; (b) worm with partially exposed pharynx; (c) mid-body segments. Scale bars: 1 mm.
Figure 6 in A bloom of the green worm Phyllodoce tuberculosa Kudenov, 1975 in a beach of the Southern Gulf of California, Mexico (Annelida, Errantia, Phyllodocidae)
Figure 6. Preserved specimens of Phyllodoce tuberculosa stained with Shirlastain-A. (a) Anterior end, pharynx fully exposed, dorsal view; (b) same, ventral view; (c) transversal section of basal half of proboscis; (d) pharynx tip, frontal view, showing distal papillae. Scale bars: a, b, d = 1 mm; c = 0.5 mm.
Figure 2 in A bloom of the green worm Phyllodoce tuberculosa Kudenov, 1975 in a beach of the Southern Gulf of California, Mexico (Annelida, Errantia, Phyllodocidae)
Figure 2. Specimens of Phyllodoce tuberculosa during low tide in Playa Norte, Mazatlán, Southern Gulf of California. (a) Panoramic view and use of quadrant; (b) mucus trails; (c) green single worm, detail of (b). Scale bars: a = 5 cm; b = 10 cm; c = 3 cm.
Figure 4 in A bloom of the green worm Phyllodoce tuberculosa Kudenov, 1975 in a beach of the Southern Gulf of California, Mexico (Annelida, Errantia, Phyllodocidae)
Figure 4. Micrographs of live, relaxed specimens of Phyllodoce tuberculosa. (a) Prostomium and anterior segments, ventral view; (b) mid-body segments, ventral view; (c) male, parapodia from mid-body segments, lateral view; (d) spermatozoa. Scale bars: a–c = 0.8 mm; d = not scaled, magnification 1000X.
Figure 5 in A bloom of the green worm Phyllodoce tuberculosa Kudenov, 1975 in a beach of the Southern Gulf of California, Mexico (Annelida, Errantia, Phyllodocidae)
Figure 5. Micrographs of parapodia and dorsal cirri of Phyllodoce tuberculosa. (a) Female, parapodia of mid-body segments full of oocytes (indicated with arrows); (b) dorsal cirri of anterior segments; (c) dorsal cirri of mid-body segments; (d) dorsal cirri of posterior segments, and pygidial cirri. (a–c) Live, relaxed specimens; (d) fixed specimen stained with Shirlastain-A, dorsal view. Scale bars: a = 1.5 mm; b, d = 0.5 mm; c = 1 mm.
FIGURES 1122 in Two new species of the genus Orizabus Fairmaire (Coleoptera: Scarabaeidae: Dynastinae) from southern and central Mexico
FIGURES 1122. Orizabus dechambrei Morón, Tapia and Aragón, sp. nov. 11 Male head, dorsal view; 12 Holotype head and pronotum, lateral view; 13 Paratype ibid; 14 Male foretibia, dorsal view; 15 Female foretibia, dorsal view; 16 Male hindtibia, lateral view; 17 Allotype head and pronotum, lateral view; 18 Holotype clypeal carina, frontal view; 19 Paratype clypeal carina; 20 Parameres, distal view; 21 Male genital capsule, lateral view; 22 Female genital plates, ventral view. Scale bar 1 mm.
FIGURES 19 in Two new species of the genus Orizabus Fairmaire (Coleoptera: Scarabaeidae: Dynastinae) from southern and central Mexico
FIGURES 19. Orizabus vulcanicus Morón, Tapia and Aragón, sp. nov. 1 Male head, dorsal view; 2 Male head and pronotum, lateral view; 3 Male clypeal carina, frontal view; 4 Male foretibia, dorsal view; 5 Female foretibia, dorsal view; 6 Male hindtibia, lateral view; 7 Female genital plates, ventral view; 8 Male genital capsule, lateral view; 9 Parameres, distal view. Scale bar 1 mm.
FIGURES 19–24. D in Duocrassana longula, new genus and species of leafhopper (Hemiptera: Cicadellidae: Deltocephalinae) from southern Mexico and its relationship to other genera in Athysanini
FIGURES 19–24. D. longula gen. and sp. nov., female genitalia. 19. First valve, lateral view; 20. Detail of sculpture of first valvula; 21. Second valve, lateral view; 22. Teeth from dorsal margin of second valve; 23. Morphology of tooth; 24. Pygofer, lateral view.
FIGURES 1–3 in Duocrassana longula, new genus and species of leafhopper (Hemiptera: Cicadellidae: Deltocephalinae) from southern Mexico and its relationship to other genera in Athysanini
FIGURES 1–3. Head of male holotype of Duocrassana longula gen. and sp. nov. 1. Dorsal view; 2. Frontal view; 3. Lateral view.
FIGURES 7–14 in Duocrassana longula, new genus and species of leafhopper (Hemiptera: Cicadellidae: Deltocephalinae) from southern Mexico and its relationship to other genera in Athysanini
FIGURES 7–14. Male holotype and female paratype genitalia of D. longula gen. and sp. nov. 7. Pygofer and segment X, lateral view; 8. Pygofer and segment X, dorsal view; 9. Style, dorsal view; 10. Connective, dorsal view; 11. Female sternite VII, ventral view; 12. Aedeagus, lateral view; 13. Apex of aedeagus, dorsal view; 14. Subgenital plates and valve, ventral view.
FIGURES 4–6. D in Duocrassana longula, new genus and species of leafhopper (Hemiptera: Cicadellidae: Deltocephalinae) from southern Mexico and its relationship to other genera in Athysanini
FIGURES 4–6. D. longula gen. and sp. nov. 4. Forewing, dorsal view; 5a. Front femur, frontal view; 5b. Front tibia, frontal view; 6a. Hind tibia, dorsal view; 6b. Hind tarsomeres, lateral view.
FIGURES 32–46. Picripleuroxus quasidenticulatus, from Leona Vicario II in Cladocera (Crustacea: Ctenopoda, Anomopoda) from southern Mexico, Belize and northern Guatemala, with some biogeographical notes
FIGURES 32–46. Picripleuroxus quasidenticulatus, from Leona Vicario II, Tabasco State, Mexico. Nomenclature of setation pattern follows Chiambeng & Dumont (2004). 32) Lateral view; 33–34) Variability of posterior margin of valves; 35a–b) Variability of labrum shape; 36) A2, lateral; 37) Postabdomen; 38) Limb I, endites I–III; 39) Limb I, ODL and inner distal lobe IDL; 40) Limb II; 41) Limb III, exopodite and epipodite (GT omitted for simplicity); 42) Limb III, endopodite; 43) Limb IV, exopodite; 44) Limb IV, endopodite; 45) Limb V, endopodite; 46) Limb V, exopodite.
FIGURES 2–8 in Cladocera (Crustacea: Ctenopoda, Anomopoda) from southern Mexico, Belize and northern Guatemala, with some biogeographical notes
FIGURES 2–8. Diaphanosoma bergamini, parthenogenetic female from La Esperanza 1 lagoon; 2) Lateral view; 3) Ventral flap and posterior margin of valves; 4) Spine on dorsal side near posterior margin of valve; 5) Second antenna, lateral view; 6) Distal part of basal segment of A2; 7) Distal side of first segment of upper 2segmented branch; 8) Postabdomen and claws.
FIGURES 58–64 in Cladocera (Crustacea: Ctenopoda, Anomopoda) from southern Mexico, Belize and northern Guatemala, with some biogeographical notes
FIGURES 58–64. Oxyurella ciliata, from La Esperanza 1, Mexico. 58) Lateral view; 59) Posterior margin of valve; 60) Head pores; 61) Labrum; 62) A2, lateral; 63) Postabdomen; 64) Distal part of postabdomen with claws. FIGURES 65–76. Oxyurella longicaudis from Sabancuy, Campeche State, Mexico. 65) Habitus; 66a–b) Labrum, variation in shape; 67) Posterior margin of valves; 68) A2, lateral; 69) Postabdomen; 70) Distal part of postabdomen with claws; 71) Closer view of ODL; 72) Limb I; 73) Limb II; 74) Limb IV; 75) Close view of inner side of endite and gnathobase of limb IV; 76) Limb V.
FIGURES 47–49 in Cladocera (Crustacea: Ctenopoda, Anomopoda) from southern Mexico, Belize and northern Guatemala, with some biogeographical notes
FIGURES 47–49. Ephemeroporus tridentatus, from Silvituc lagoon, Campeche, Mexico. 47) Lateral view; 48) Variability of labrum shape; 49) Postabdomen.
FIGURES 54–57 in Cladocera (Crustacea: Ctenopoda, Anomopoda) from southern Mexico, Belize and northern Guatemala, with some biogeographical notes
FIGURES 54–57. Alona cf. ossiani from Silvituc lagoon, Campeche, Mexico. 54) Lateral view; 55) Head pores, dorsal view; 56) Posterior margin of valves a) Variant without well defined groups b) Variant with 7 groups of 4–5 members; 57) Postabdomen, lateral view.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.