Éditeur(s) : Université des Antilles AREBio Groupe de recherche BIOSPHERES : BIOlogie, Sciences Physiques & Humaines pour les énergies Renouvelables, l
Extrait de : 1er colloque international BIOSPHERES, du 18 au 20 juin 2019. Université des Antilles
Description : La Martinique fait partie des 36 hots spots de la biodiversité mondiale. L'étude et la valorisation de la biodiversité marine sont une des branches de recherche du groupe BIOSPHERES. L'étude de la biodiversité dans son volet écologie permet de s'intéresser non seulement à l'échelle de l'espèce, mais aussi à l'échelle de l'habitat. À l'échelle de l'espèce, les études portent sur : l'identification taxonomique, la description de nouvelles espèces, la description de leur habitat, l'évaluation de leur abondance (commune, rare, ubiquiste, etc.), ainsi que le caractère autochtone ou exotique. À l'échelle de l'habitat, les études portent sur : la description, la répartition des habitats et l'évaluation de leur état de santé. Le second volet s'intéresse à la valorisation de la biodiversité marine. Cette intervention nous en parle un peu plus.

Droits : CC-BY-NC-ND - Attribution - Pas d'utilisation commerciale - Pas de modification
Permalien : http://www.manioc.org/fichiers/V19062
V19062

Éditeur(s) : HAL CCSD Oxford University Press (OUP)
Résumé : Architectural analyses of temperate tree species using a chronological approach suggest that the expression of epicormic branches is closely related to low growth rates in the axes that make up the branching system. Therefore, sole consideration of epicormic criteria may be sufficient to identify trees with low secondary growth levels or with both low primary and secondary growth levels. In a tropical tree such as Dicorynia guianensis (basralocus), where chronological studies are difficult, this relationship could be very useful as an easily accessible indicator of growth potentials. A simple method of architectural tree description was used to characterize the global structure of more than 1650 basralocus trees and to evaluate their growth level. Measurements of simple growth characters [height, basal diameter, internode length of submittal part (top of the main axis of the tree)] and the observation of four structural binary descriptors on the main stem (presence of sequential branches and young epicormic branches, state of the submittal part, global orientation), indicated that epicormic branch formation is clearly related to a decrease in length of the successive growth units of the main stem. Analysis of height vs. diameter ratios among different tree subgroups, with and without epicormic branching, suggested that trees with epicormic branches generally have a low level of secondary growth compared with primary growth.
ISSN: 0305-7364

hal-01032037
https://hal.archives-ouvertes.fr/hal-01032037
DOI : 10.1093/aob/mcg119

Éditeur(s) : Commonwealth of Puerto Rico, Economic Development Administration, Continental Operations Branch Commonwealth of Puerto Rico, Economic Development Administration, Continental Operations Branch ( New York )
Résumé : (Statement of Responsibility) Commonwealth of Puerto Rico, Economic Development Administration, Continental Operations Branch.
Puerto Rico
Puerto Rico
Puerto Rico

23978508

Éditeur(s) : HAL CCSD
Résumé : East African Rift (EAR) is the divergent plate boundary. EAR exposes different stages of extension, from early stage rifting in Tanzania to oceanic accretion in Afar (Ethiopia). Manyara basin is the southernmost rift system of the east branch of EAR with recent volcanism (< 1.5 Ma) and a seismic swarm in the lower crust (20 – 40 km). Due to its location and tectonic setting, the Manyara basin offers the opportunity to study the earliest stage of rift initiation. Manyara volcanism is composed of several types of hyper-alkaline lavas as Mg-nephelinites (Mg# > 55) (Labait, Kwaraha), calciocarbonatite (Kwaraha) and evolved nephelinites (Mg# < 35) (Hanang).Mg-nephelinites (Labait and Kwaraha) are primary lavas mainly composed of olivine and clinopyroxene (cpx). Geochemical modelling from trace elements suggests that these primary magmas result from a degree of partial melting < 1 % from a CO2-garnet-phlogopite-bearing peridotite. These magmas have an asthenospheric source at depth > 120 km (lava carries xenoliths with equilibrium conditions > 4 GPa). The minerals were crystallized from a magma with a low H2O content (0.1 and 0.5 wt% H2O). The calciocarbonatite and evolved nephelinites are derived from Mg-nephelinites by fractional crystallization and immiscibility processes. Hanang nephelinites are silica- and alkaline-rich lavas (44.2 – 46.7 wt % SiO2, 9.5 –12.1 wt % Na2O+K2O, respectively) composed by cpx, Ti-garnet, nepheline, apatite and titanite. Complex zonation of cpx (e.g. abrupt change of Mg#, Nb/Ta, and H2O) and trace element patterns of nephelinites record magmatic differentiation involving open system with carbonate-silicate immiscibility and primary melt replenishment. The low H2O content of cpx (3 – 25 ppm wt. H2O) indicates that at least 0.3 wt % H2O was present at depth during carbonate-rich nephelinite crystallization at 340 – 640 MPa and 1050 – 1100 °C. The study of hosted-nepheline melt inclusions from Hanang allows constraining the late magmatic evolution of nephelinites during storage and magma ascent. Melt inclusions are composed by a silicate trachytic glass, a carbonate phase and a shrinkage bubble. Trachytic glass contains high content in CO2 (0.43 wt %, SIMS analyses), sulfur (0.21 – 0.92 wt % S), chlorine (0.28 –0.84 wt % Cl) and H2O low content (< 0.1 wt %, Raman analyses). Immiscibility process leading to the formation of carbonate occurs in a closed system during rapid magma ascent between 200 – 500 MPa. The carbonate phase is a Ca-Na-K-S-rich and anhydrous carbonate (33 wt % CaO, 20 wt % Na2O, 3 wt % K2O, and 3 wt % S). The pre-immiscible liquid has a phonolitic composition with 6 ± 1.5 wt % CO2 at 700 MPa. A preliminary study of melt inclusions by XANES spectroscopy and whole rocks by Mössbauer spectroscopy was used to determine these Manyara lavas were formed at oxidizing conditions (~ ΔFMQ +1.5).The early stage rifting volcanism (Manyara Basin) is characterized by CO2-rich and H2O-poor magmas from at least 120 km below the rift escarpment. The presence of CO2-rich magmas and the small amount of volcanic rocks erupted at the surface may indicate that the storage and percolation of these magmas at depth is a potential trigger for deep seismic swarms.
Le rift Est africain (REA) est une frontière de plaque en extension. Ce rift présente plusieurs stades d’extension, de l’initiation du rift en Tanzanie jusqu’à l’accrétion océanique en Afar. Le bassin de Manyara se situe le plus au sud de branche Est du REA. Il est caractérisé par la présence de volcanisme récent (< 1,5 Ma) et d’un essaim sismique dans la croûte inférieure (20 – 40 km). De par sa localisation et son contexte tectonique, le bassin de Manyara offre l’opportunité d’étudier le stade le plus précoce de l’initiation du rift. Le bassin de Manyara est composé de plusieurs types de laves hyperalcalines, les néphélinites magnésiennes (Mg# > 55) (Labait, Kwaraha), de calciocarbonatite (Kwaraha) et des néphélinites différenciées (Mg# < 35) (Hanang).Les néphélinites magnésiennes (Labait et Kwaraha) sont des laves primaires composées d’olivines et de clinopyroxènes (cpx). La modélisation géochimique des éléments en trace suggère que ces magmas primaires résultent d'un degré de fusion partielle ≤ 1 % à partir d'une péridotite à grenat et phlogopite. Ces magmas proviennent d’une profondeur > 120 km (présence de xénolites avec des conditions d’équilibre > 4 GPa). Les minéraux ont cristallisés à partir d’un magma pauvre en eau (0,1 et 0,5 pds % H2O). La calciocarbonatite et les néphélinites différenciés sont issues des néphélinites magnésiennes par cristallisation fractionnée et processus d’immiscibilité. Les néphélinites du Hanang sont riches en éléments alcalins (9,5 – 12,1 pds % Na2O+K2O) et en silice (44,2 – 46,7 pds% SiO2) et sont composés de cpx, grenat, néphéline, titanite et apatite. La zonation complexe dans les cpx (par exemple, changement brusque de Mg#, Nb/Ta, et H2O) implique une différenciation magmatique en système ouvert avec immiscibilité de liquide carbonaté et silicaté ainsi qu’un remplissage de la chambre magmatique avec des liquides primaires. La faible teneur en eau des cpx (3 – 25 ppm H2O) indique la présence d’un magma pauvre en eau (0,3 pds % H2O) lors de la cristallisation des cpx à des conditions crustales (340 – 640 MPa et 1050 – 1100 °C). L’étude des inclusions vitreuses dans les néphélines de Hanang permet de contraindre l'évolution magmatique tardive des néphélinites et le comportement des éléments volatils (CO2, H2O, S, F, Cl) lors du stockage et de la remontée du magma. Les inclusions vitreuses sont composées d’un verre trachytique, d’une phase carbonatée et d’une bulle de rétraction. Le verre trachytique contient du CO2 (0,43 pds % CO2, analyses SIMS), du soufre (0,21 à 0,92 pds% S), du chlore (0,28 – 0,84 pds % Cl) et très peu d’H2O (< 0,1 pds % H2O, analyses Raman). Le processus d’immiscibilité conduisant à la formation du carbonate se produit dans un système fermé pendant l'ascension rapide du magma, entre 200 – 500 MPa. La phase carbonatée est un carbonate anhydre et riche en Ca-Na-K-S (33 pds % CaO, 20 pds % Na2O, 3 pds % K2O, et 3 pds % S). Le liquide pré-immiscible a une composition phonolitique avec 6 ± 1,5 pds % CO2 à une pression de 700 MPa. Une étude préliminaire des inclusions par spectroscopie XANES et des roches par spectroscopie Mössbauer a permis de déterminer que les laves de Manyara se sont formées à conditions oxydantes (~ ∆FMQ +1,5).À l’initiation du rift, le volcanisme dans le bassin de Manyara est caractérisé par des magmas riches en CO2 et pauvres en H2O issus d’au moins 120 km de profondeur sous l'escarpement du rift. La présence de ces magmas riches en CO2 et la faible quantité de roches volcaniques émises à la surface peuvent indiquer que le piégeage et la percolation de ces magmas en profondeur est un déclencheur potentiel des essaims sismiques profonds.
https://tel.archives-ouvertes.fr/tel-01563231

NNT : 2016MONTT114
tel-01563231
https://tel.archives-ouvertes.fr/tel-01563231
https://tel.archives-ouvertes.fr/tel-01563231v2/document
https://tel.archives-ouvertes.fr/tel-01563231/file/2016_BAUDOUIN_archivage.pdf

Éditeur(s) : Office of the Postmaster General] Office of the Postmaster General] ( [Washington )
Résumé : James E. Stuart, Chairman of the Committee.
Excerpts concerning military stations in Cuba, Porto Rico, and Philippine Islands affixed to two leaves between pages 8 & 9.
Puerto Rico
Cuba

002441315
29982977
AME6521

Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.
A view of the Dock and Dine Apartments and Restaurant on Man of War Cay, Abaco, Bahamas. The pink and white painted building has a covered deck and is built on the beach with a view of the harbor. On the wall is a sign that reads, “Dock & Dine Apartments & Restaurant.” The wall is also decorated with shells, tree branches, metal bins, and various round objects. Slide labeled Dock Restaurant Man of War Cay April '65.
Bahamas -- North America -- Man of War Cay, Abaco

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
Sheet 5:16
http://ufdc.ufl.edu/AA00028450/00001

Résumé : Don Vicente was entertaining Ignacio Haya, a manufacturing friend from New York, when Gargol and Gutierrez arrived. Haya, of the firm Sanchez and Haya, had come to Key West for both business and pleasure; he always enjoyed the warm Florida climate. Sr. Haya was also there to discuss business. Both he and Ybor were constantly being threatened with labor strikes which could cripple their operations. Haya saw the problem as so serious that he had already dispatched his associate, Serafin Sanchez, to search for other possible locations to open branch factories.8 Don Vicente was also confronted with labor hostility in Key West, and he too wanted to move to a location where labor was not organized. They were undoubtedly influenced by other manufacturers who were forming company towns, away from the crowded cities, as a means of accelerating production and limiting union influence. Ybor and Haya sent inquiries to Galveston, Mobile, and Pensacola, expressing their interests in possibly locating in one of those cities. Don Vicente had earlier learned about Tampa from Edward Manrara, but had not yet given it serious consideration as a possible location for a branch factory; not until the visit of Gutierrez and Gargol.
(Funding) Funded in part by the Institute for Museum and Library Services (IMLS), Ephemeral Cities Project.
Tampa |z 1271000 |2 ceeus
Hillsborough County |z 12057 |2 ceeus
United States of America -- Florida -- Hillsborough County -- Tampa

Droits : All rights reserved. 2005.
C24-05713

Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.
A pregnant woman buying fruits from street fruit vendors, an example of a small business enterprise in Jamaica. These self-shoreline made fruit stands have roofs made from palm frond leaves and are supported by tree branches. The tables are covered with bright colored plastic cloths. The fruits include Otaheite apples, nesberries, and mangoes. Under the tables are Dragon Stout and Red Stripe boxes. In the background is a house behind a wire fence. Slide labeled Jam.
Jamaica -- Caribbean region

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
http://ufdc.ufl.edu/AA00030854/00001

Éditeur(s) : Israel Program for Scientific Translations, Israel Program for Scientific Translations Israel Program for Scientific Translations, Israel Program for Scientific Translations ( Jerusalem )
Résumé : (Internal Comments) [Result of a contract study between the Foreign Agricultural Service, U.S. Dept. of Agriculture, and the Institute of Social and Economic Research, University College of the West Indies, Jamaica; administered by the Western Hemisphere Branch, Regional Ana
Cover title.
"Main sources and references": p. 125-127.
(Statement of Responsibility) Result of a contract study between the Foreign Agricultural Service, U.S. Dept. of Agriculture, and the Institute of Social and Economic Research, University College of the West Indies, Jamaica; administered by the Western Hemisphere Branch, Regional Analysis Division, Economic Research Service.
Jamaica
Trinidad and Tobago
Saint Lucia
Barbados
Dominica
Grenada
Antigua and Barbuda
Bahamas
Saint Vincent and the Grenadines
Cayman Islands
Bermuda
Saint Kitts-Nevis
Turks and Caicos Islands
British Virgin Islands
Anguilla
Montserrat
West Indies
West Indies

AFM5590
06637024
001128391
agr65000277

Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. The are organized by geographical location.
A man on a bicycle riding away from the Black River post office and bank. The building houses a branch of the Government Savings Bank and the post office. The Government Savings Bank was established in 1870 and was opened daily. With the act of the 23rd of June 1973, the assets of the bank were used to establish the Workers Savings and Loan Bank. On the 31st of October 1671, Jamaica became the first British colony to establish a post office. This two story building has a zinc roof with fretwork and also sends telegraphs. Black River is part of a protected National Heritage District in Saint Elizabeth, Jamaica. Slide labeled Jam. Black River (S.).
Jamaica -- Caribbean region -- Black River, Saint Elizabeth

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
http://ufdc.ufl.edu/AA00030872/00001

Éditeur(s) : Yale University
Résumé : Data from a hydrographic section carried out in January-March 1994 offshore from the eastern coast of South America from 50S to 10N, are used to quantify the full-depth exchanges of water between the western boundary currents and the ocean interior. In the upper and intermediate layers, the westward transport associated with the southern branch of the South Equatorial Current was 49 Sv at the time of the cruise. The transports of the central and northern branches in the upper 200 m were 17 Sv and 12 Sv, respectively. After subtraction of the parts that recirculate in the subtropical, subequatorial, and equatorial domains, the fraction of the South Equatorial Current that effectively contributes to the warm water export to the North Atlantic is estimated at 18 Sv. The poleward boundary of the current southern branch is at 31S through the whole thickness of the subtropical gyre, but the latitude of the northern boundary varies from 7 degrees 30'S at the surface to 27S at 1400 m depth. The estimated latitude of its bifurcation into the Brazil Current and North Brazil Undercurrent also varies downward from about 14S at the surface to 28S at a depth of 600 m.In the North Atlantic Deep Water, eastward flows exceeding 10 Sv are observed at 3 degrees -4 degrees of latitude in both hemispheres, at 10S, and at 34S-30S. Between 4S and 17S, a net westward flow with an estimated transport of 19 Sv reinforces the southward deep western boundary current. Cyclonic circulations of Antarctic Bottom Water along the western boundaries of the Argentine and Brazil basins have amplitudes of 15 Sv and 13 Sv, respectively, exceeding those of the interbasin exchanges. The net alongshore transport of this water mass between the hydrographic section and the continental slope reverses to a southward direction from 13S to 27S, probably in relation with an eastward shift of the equatorward near-bottom boundary current at these latitudes.
Journal of Marine Research (0022-2402) (Yale University), 2000-11 , Vol. 58 , N. 6 , P. 1007-1039

Droits : 2000 Yale University
http://archimer.ifremer.fr/doc/2000/publication-803.pdf
DOI:10.1357/002224000763485782
http://archimer.ifremer.fr/doc/00000/803/

Résumé : Additional label information: Flowering branch. Summit, Canal Zone. USDA - Foreign Agric'l Relations Photo
North America -- Panama -- Caribbean
Caribbean
Caribbean area
Panama

C. Z. 63

Éditeur(s) : HAL CCSD European Geosciences Union
Résumé : Xylem density is a physical property of wood that varies between individuals, species and environments. It reflects the physiological strategies of trees that lead to growth, survival and reproduction. Measurements of branch xylem density, ρx, were made for 1653 trees representing 598 species, sampled from 87 sites across the Amazon basin. Measured values ranged from 218 kg m−3 for a Cordia sagotii (Boraginaceae) from Mountagne de Tortue, French Guiana to 1130 kg m−3 for an Aiouea sp. (Lauraceae) from Caxiuana, Central Pará, Brazil. Analysis of variance showed significant differences in average ρx across regions and sampled plots as well as significant differences between families, genera and species. A partitioning of the total variance in the dataset showed that species identity (family, genera and species) accounted for 33% with environment (geographic location and plot) accounting for an additional 26%; the remaining "residual" variance accounted for 41% of the total variance. Variations in plot means, were, however, not only accountable by differences in species composition because xylem density of the most widely distributed species in our dataset varied systematically from plot to plot. Thus, as well as having a genetic component, branch xylem density is a plastic trait that, for any given species, varies according to where the tree is growing in a predictable manner. Within the analysed taxa, exceptions to this general rule seem to be pioneer species belonging for example to the Urticaceae whose branch xylem density is more constrained than most species sampled in this study. These patterns of variation of branch xylem density across Amazonia suggest a large functional diversity amongst Amazonian trees which is not well understood.
ISSN: 1726-4170

hal-01032137
https://hal.archives-ouvertes.fr/hal-01032137

Résumé : Additional label information: branch with fruit. Summit, Canal Zone. USDA - Foreign Agric'l Relations Photo
Additional label information: Trees nineteen years old. Summit, Canal Zone. Cassia javanica
North America -- Panama -- Caribbean
Caribbean
Caribbean area
Panama

C.Z. 83

Résumé : Arbusto aromático, 1 a 2 m de alto, ramas largas mimbreadas, decumbentes y arraigantes, densamente puberulentas o estrigosas. Hojas opuestas o ternadas, brevemente pecioladas, de 2-6 (raro 9) cm de longitud y 1.2-4.5 cm de ancho, oblongas, arrugadas, festonadas, cubiertas con pelillos cortos y nervaduras prominentes. Inflorescencias en cabezuelas axilares globosas, cilíndricas en la fructificación. Brácteas ovadas, acuminadas, las inferiores mucronadas. Flores zigomorfas, cáliz de 1.5-1.7 mm de largo y acrescente a la madurez; corola morada con fauces amarillas y blancas, rosada o blanca de 4 a 5 mm de largo. Fruto obovoide de 3 mm de ancho.
Arbuste aromatique, de 1 à 2 m de haut, aux branches longues et flexibles, décombantes et s&rsquo;enracinant spontanément, très pubérulentes ou rugueuses. Feuilles opposées ou par groupes de trois, à pétiole court, de 2-6 (rarement 9) cm de longueur et de 1,2-4,5 cm de large, oblongues, rugueuses, festonnées, couvertes de petits poils courts et de nervures proéminentes. Inflorescences sous forme de petites têtes axillaires arrondies, cylindriques lors de la fructification. Bractées ovées, acuminées, les plus basses étant mucronées. Fleurs zygomorphes, calice de 1,5-1,7 mm de long continuant à croître une fois arrivé à maturité; corolle violette avec coeur jaune et blanc, rosée ou blanche de 4 à 5 mm de long. Fruit ovoïde de 3 mm de large.
Aromatic shrub, 1 to 2 m in height, branches long, slender and flexible like willow stems (osier-like), decumbent, lower basal branches can become long rooting suckers, densely puberulent or strigose.  Leaves opposite or ternate, briefly petiolate, 2-6 (rarely 9) cm long and 1.2-4.5 cm wide, oblong, corrugate, crenate, covered with short small hairs (pubescent) and prominent veins.  Inflorescences in globose axillary heads, cylindrical upon fructification.  Bracts ovate, acuminate, the inferior ones mucronate.  Flowers zygomorphic; calyx 1.5-1.7 mm in length and accrescent when ripe; corolla purple with yellow and white fauces (the throat of a gamopetalous corolla), pink or white, 4 to 5 mm in length.  Fruit obovoid, 3 mm in diameter.
América tropical y subtropical.
Amérique tropicale et subtropicale.
Tropical and subtropical America.

http://www.tramil.net/fototecaplant211

Résumé : Planta trepadora, glabra con zarcillos; ramas articuladas. Hojas alternas, simples, oblongas a aovadas, de hasta 15 cm, densamente pilosas a glabras, con el margen ligeramente dentado. Cimas pedunculadas, amarillas, muy ramificadas; flores pequeñas, verdes o amarillo-verdosas. Baya ovoide o globosa, purpúrea a negra, de 8 a 10 mm, con una sola semilla.
Plante grimpante, glabre avec vrilles; branches articulées. Feuilles alternes, simples, oblongues à ovées, pouvant atteindre 15 cm, fortement pileuses à glabres, au bord légèrement denté. Cimes pédonculées, jaunes, très ramifiées; fleurs petites, vertes ou jaune-verdâtre. Baie ovoïde ou arrondie, pourpre à noire, de 8 à 10 mm, avec une seule graine.
Climbing plant up to 20 m or more, glabrous with tendril; stem cylindrical often with hanging roots, branches articulate.  Leaves alternate, simple, oblong to ovate, 5-15 cm x 7.5 cm, hairy to smooth, with slightly dentate edge. Inflorescence a cyme two-three times branched; flowers light yellow; fruits a berry, purple-black, 8-10 mm long, with a single seed.
Regiones tropicales del continente americano.
Régions tropicales du continent américain.
Tropical regions of the American continent.

http://www.tramil.net/fototeca/plant126

Résumé : Tampa's cigar workers followed the direction of their own independent union, popularly known as La Resistencia, in the general strike of 1901.The major dispute in 1901 involved efforts of manufacturers to establish branch factories in Pensacola and Jacksonville. The union interpreted these moves as an attempt to maintain an open shop policy and struck to force a closing of these operations. Strike leadership was in Spanish and Cuban hands, but Italians were active in the ranks and in supplying street-corner oratory that helped to maintain worker solidarity. Appeals to the strike cause were effective in prompting numerous workers to leave Tampa and find employment elsewhere in an effort to send back support
(Funding) Funded in part by the Institute for Museum and Library Services (IMLS), Ephemeral Cities Project.
Tampa |z 1271000 |2 ceeus
Hillsborough County |z 12057 |2 ceeus
United States of America -- Florida -- Hillsborough County -- Tampa
21st Street

Droits : All rights reserved. 2005.
P21-0252

Éditeur(s) : HAL CCSD Botanical Society of America
Résumé : Premise of the study : Wood density correlates with mechanical and physiological strategies of trees and is important for estimating global carbon stocks. Nonetheless, the relationship between branch and trunk xylem density has been poorly explored in neotropical trees. Here, we examine this relationship in trees from French Guiana and its variation among different families and sites, to improve the understanding of wood density in neotropical forests. Methods : Trunk and branch xylem densities were measured for 1909 trees in seven sites across French Guiana. A major-axis fit was performed to explore their general allometric relationship and its variation among different families and sites. Key results : Trunk xylem and branch xylem densities were significantly positively correlated, and their relationship explained 47% of the total variance. Trunk xylem was on average 9% denser than branch xylem. Family-level differences and interactions between family and site accounted for more than 40% of the total variance, whereas differences among sites explained little variation. Conclusions : Variation in xylem density within individual trees can be substantial, and the relationship between branch xylem and trunk xylem densities varies considerably among families and sites. As such, whole-tree biomass estimates based on non-destructive branch sampling should correct for both taxonomic and environmental factors. Furthermore, detailed estimates of the vertical distribution of wood density within individual trees are needed to determine the extent to which relying solely upon measures of trunk wood density may cause carbon stocks in tropical forests to be overestimated.
ISSN: 0002-9122

hal-01032401
https://hal.archives-ouvertes.fr/hal-01032401
DOI : 10.3732/ajb.1000034

Éditeur(s) : [G. Norman and Son, printers] [G. Norman and Son, printers] ( London )
Résumé : (Statement of Responsibility) reprinted in reduced facsimile, and tr. from the unique copy of the original edition (printed by Johann Rosenbach at Barcelona early in April 1493) lately in the possession of Bernard Quaritch.
The preface is by Michael Kerney.
The original is now in the Lenox branch of the New York Public Library. cf. Lenox Library, The letter of Columbus, 1892, p. viii.
America

000611495
ADE0682
01219363
19018709

Résumé : Herbácea perenne, con ramas rastreras o ascendentes, con raíces en los nudos. Hojas opuestas, sésiles, elípticas a obovadas de 2 a 12 cm, obtusas a agudas en el ápice, más o menos cuneadas en la base, serrado-dentadas, a menudo lobuladas. Cabezuelas solitarias en pedúnculos axilares o terminales; involucros campanulados; capítulos radiados, amarillos, en número de 10 aproximadamente. Aquenio obovoide, tuberculado.
Herbacée pérenne, à branches rampantes ou ascendantes, avec des racines au niveau des noeuds. Feuilles opposées, sessiles, elliptiques à obovées de 2 à 12 cm, obtuses à aiguës à la pointe, plus ou moins cunéiformes à la base, aux bords découpés en dents-de-scie, souvent lobées. Capitules solitaires en pédoncules axillaires ou terminaux; involucrés en forme de clochette; capitules radiés, jaunes, approximativement au nombre de 10. Akène ovoïde, tuberculé.
Perennial herb, with trailing or ascending branches rooting at thenodes.  Leaves opposite, sessile, elliptical to obovate, 2-12 cm x 1-6 cm, apex acute,cuneate at the base, marginsserrate-dentate often lobed; inflorescence a capitulum on axillary or terminal peduncles; ray florets bright yellow; achenes 5mm long, oblong to obovoid, compressed.
Originaria de América, ampliamente distribuida en las regiones tropicales y subtropicales del mundo.
Originaire d’;Amérique, largement répandue dans les régions tropicales et subtropicales du monde.
Native to America, widely distributed in trop

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