RESUMO

Tropical rainforests harbor a particularly high plant diversity. We hypothesize that potential causes underlying this high diversity should be linked to distinct overall functionality (defense and growth allocation, anti-stress mechanisms, reproduction) among the different sympatric taxa. In this study we tested the hypothesis of the existence of a metabolomic niche related to a species-specific differential use and allocation of metabolites. We tested this hypothesis by comparing leaf metabolomic profiles of 54 species in two rainforests of French Guiana. Species identity explained most of the variation in the metabolome, with a species-specific metabolomic profile across dry and wet seasons. In addition to this "homeostatic" species-specific metabolomic profile significantly linked to phylogenetic distances, also part of the variance (flexibility) of the metabolomic profile was explained by season within a single species. Our results support the hypothesis of the high diversity in tropical forest being related to a species-specific metabolomic niche and highlight ecometabolomics as a tool to identify this species functional diversity related and consistent with the ecological niche theory.

Assuntos

RESUMO

Aunque su etiología aun no está claramente definida, los linfomas son proliferaciones malignas del sistema linfoide y se clasifican según su histología, como tipos hodgkin y no hodgkin. Los linfomas no hodgkin (LNH) comprenden todos los que no muestran en su constitución la célula de Red – Stemberg; son muy heterogéneos, no todos se localizan en ganglios linfáticos (como ejemplo de forma extraganglionar podemos citar los que se presentan asociados a la presencia de H. pylori en la mucosa del estómago), la mayoría con origen en los linfocitos B y tiene marcadores de superficie característicos de la propia membrana celular. La edad más común de presentación es aproximadamente la quinta década de vida y en adelante, actualmente los LNH se los puede dividir en dos grupos de acuerdo a su conducta clínica: indolentes y agresivos, aunque hay otras clasificaciones (Rappaport, REAL, Kiel, Working F., etc.) El diagnóstico definitivo lo da la biopsia apoyado en estudios de imágenes. Presentamos el caso de una paciente de sexo femenino, 60 años de edad, que consulta por adenopatía inguinal unilateral derecha, leve edema y dolor en miembro inferior derecho, con moderada pérdida de peso.

Although its etiology is not yet clearly defined, lymphomas are malignant proliferations of the lymphatic system and are classified according to their histology as Hodgkin and non Hodgkin types. The Non-Hodgkin’s lymphomas (NHL) constitute all the ones whose composition does not show the Red-Stemberg cell. They are heterogenic, and not all of them are localized in lymph nodes (as a sample of extraganglionar shape we can mention the ones that are associated to the presence of Helicobacter Pylori in the stomach mucous), most of them originated in the lymphocyte B, which have surface indicators typical of the cellular membrane. In some cases they appear at the age of 50 on, nowadays the NHL can be divided into two groups according to their clinical behavior: indolent and aggressive, although there are other classifications (Rappaport, REAL, Kiel, Working F, etc) the definite diagnosis is given by the biopsy and image diagnosis. Here the case of a 60 year-old female patient whose consultation is for right inguinal adenopathy, slight edema and pain in right leg and moderate weight loss.

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