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      Catasetum krahlii (Orchidaceae, Catasetinae): a new and threatened species from the Brazilian Amazon

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          Abstract

          Abstract In the present study we propose a new Catasetum taxon belonging to the group of species with symmetrical and converging antennae. It was found in a vegetation of “terra firme” and “campinarana” in the central Brazilian Amazon. A detailed description of the taxon is given as well as a photograph plate and comments relating to distribution, habitat, phenology and conservation status. It is compared to C. rivularium and C. barbatum which are sympatric species and somewhat similar to the new taxon. Furthermore, we present a key to Catasetum species with symmetrical and convergent antennae occurring in the Brazilian Amazon.

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          Supporting Red List threat assessments with GeoCAT: geospatial conservation assessment tool

          Steven Bachman, Justin Moat, Andrew Hill … (2011)
          Abstract GeoCAT is an open source, browser based tool that performs rapid geospatial analysis to ease the process of Red Listing taxa. Developed to utilise spatially referenced primary occurrence data, the analysis focuses on two aspects of the geographic range of a taxon: the extent of occurrence (EOO) and the area of occupancy (AOO). These metrics form part of the IUCN Red List categories and criteria and have often proved challenging to obtain in an accurate, consistent and repeatable way. Within a familiar Google Maps environment, GeoCAT users can quickly and easily combine data from multiple sources such as GBIF, Flickr and Scratchpads as well as user generated occurrence data. Analysis is done with the click of a button and is visualised instantly, providing an indication of the Red List threat rating, subject to meeting the full requirements of the criteria. Outputs including the results, data and parameters used for analysis are stored in a GeoCAT file that can be easily reloaded or shared with collaborators. GeoCAT is a first step toward automating the data handling process of Red List assessing and provides a valuable hub from which further developments and enhancements can be spawned.
          Article 0 comments Cited 441 times – based on 0 reviews     Review now
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            An updated classification of Orchidaceae

            Mark W. Chase, Kenneth Cameron, John V. Freudenstein … (2015)
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              The evolution of staminodes in angiosperms: patterns of stamen reduction, loss, and functional re-invention.

              J Walker-Larsen, L D Harder (2000)
              Stamens that have lost their primary function of pollen production, or staminodes, occur uncommonly within angiosperms, but frequently fulfill important secondary floral functions. The phylogenetic distribution of staminodes suggests that they typically arise during evolutionary reduction of the androecium. Differences in the genetic control and patterns of stamen loss between actinomorphic and zygomorphic flowers shape staminode development. In clades with actinomorphic flowers, staminodes generally replace an entire stamen whorl and staminode loss seems irreversible. In contrast, in clades with zygomorphic flowers staminodes evolve from a subset of the stamens in a whorl and staminodes can reappear in a lineage after being lost (e.g., Cheloneae, Scrophulariaceae). If staminodes do not adopt new functions during androecium reduction they are lost quickly, so that nonfunctional staminodes appear only in recently derived taxa. Alternatively, when staminodes assume new floral roles, either directly or indirectly after a nonfunctional period, they can become integral floral components which perpetuate within clades (e.g., Orchidaceae). Indirect evolution of staminode function allows greater flexibility of function by allowing staminodes to take over roles not performed by stamens, such as involvement in mechanisms to prevent self-pollination and mechanisms of explosive pollination. Multifunctional staminodes characterize lineages with universal or widespread staminodes.
              Article 0 comments Cited 28 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (publisher-id): abb
                Title: Acta Botanica Brasilica
                Abbreviated Title: Acta Bot. Bras.
                Publisher: Sociedade Botânica do Brasil (Alta Floresta, MT, Brazil )
                ISSN (Print): 0102-3306
                ISSN (Electronic): 1677-941X
                Publication date (Print and electronic): 2023
                Volume: 37
                Electronic Location Identifier: e20220258
                Affiliations
                [1] Macapá Amapá orgnameUniversidade Federal do Amapá orgdiv1Programa de Pós-Graduação em Biodiversidade e Biotecnologia da Rede BIONORTE Brazil
                [2] Bélem Pará orgnameUniversidade Federal Rural da Amazônia orgdiv1Museu Paraense Emílio Goeldi orgdiv2Programa de Pós-graduação em Ciências Biológicas - Botânica Tropical Brazil
                [5] Macapá Amapá orgnameInstituto de Pesquisas Científicas e Tecnológicas do Estado do Amapá orgdiv1Laboratório de Taxonomia Vegetal Brazil
                [3] Oriximiná Pará orgnameMineração Rio do Norte Brazil
                [4] Villeurbanne Cedex Rhone-Alpes orgnameUniversité catholique de Lyon France
                Article
                Publisher ID: S0102-33062023000100121 Publisher ID: S0102-3306(23)03700000121
                DOI: 10.1590/1677-941x-abb-2022-0258
                SO-VID: f1d2e5fd-4dfe-4a00-ae80-cae9da2ab551
                License:

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                Date received : 19 October 2022
                Date accepted : 22 May 2023
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 38, Pages: 0
                Product

                SciELO Brazil

                Categories
                Subject: Original Article

                Keywords: epiphyte,Amazon basin,biodiversity,Manaus,orchid,taxonomy
                Data availability:
                Keywords: epiphyte, Amazon basin, biodiversity, Manaus, orchid, taxonomy

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