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      Primer relevamiento de la riqueza algal de una laguna de montaña del Noroeste Argentino Translated title: First survey of the algal richness of a Nordwestern Argentinean mountain pond

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          Abstract

          Resumen El Noroeste de Argentina presenta una amplia variedad de sistemas de aguas continentales incluidas lagunas irregulares y con dimensiones variables muchas de las cuales se han formado por deslizamientos de laderas. Las lagunas de altura son escasas, de distribución heterogénea y constituyen ecosistemas frágiles, vulnerables a la intervención humana y a efectos naturales. Estos ecosistemas leníticos, son inestables y de vida corta, por lo que su estudio es de relevancia para diversos fines. Debido a la pérdida acelerada de hábitats y extinciones de la biota, en los últimos años hubo un importante interés en revalorizar y estudiar la biodiversidad. En este contexto mundial y dado que existen escasos trabajos en la zona de estudio, se realizó un análisis de la riqueza y composición del fitoplancton en la laguna del Siambón, ubicada en las Yungas del Noroeste Argentino. Se determinaron 39 especies: 2 algas verdes, 5 algas verdes-azules (cianobacterias) y 32 diatomeas. Se presentan dos nuevas citas de diatomeas para la provincia de Tucumán (Nitzschia inconspicuayStauroneis anceps). Esta primera contribución ficológica en este sistema servirá como línea de base para futuros estudios limnológicos, ficológicos y paleoambientales. Asimismo, constituye un aporte para incrementar el conocimiento de la diversidad biológica en lagunas de altura.

          Translated abstract

          Summary Northwest Argentina has a wide variety of inland water systems including irregular ponds of variable dimensions, many of which have been formed by landslides. High-altitude ponds are scarce, of heterogeneous distribution and constitute fragile ecosystems, vulnerable to human intervention and natural effects. These lenitic ecosystems are unstable and short-lived, so their study is relevant for various purposes. Due to the accelerated loss of habitats and extinctions of biota, in recent years there has been an important interest in revaluing and studying biodiversity. In this global context and given the scarcity of research in the study area, an analysis of the richness and composition of phytoplankton was carried out in the Siambón pond, located in the Yungas of Northwest Argentina. 39 species were determined: 2 green algae, 5 green-blue algae (cyanobacteria) and 32 diatoms. Two new diatom citations are presented for Tucumán province (Nitzschia inconspicuaandStauroneis anceps). This first phycological contribution to this system will serve as a baseline for future limnological, phycological and palaeoenvironmental studies. Likewise, it constitutes a contribution to increase the knowledge of biological diversity in high altitude ponds.

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          Terrestrial Ecoregions of the World: A New Map of Life on Earth

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            Primary production of the biosphere: integrating terrestrial and oceanic components

            Integrating conceptually similar models of the growth of marine and terrestrial primary producers yielded an estimated global net primary production (NPP) of 104.9 petagrams of carbon per year, with roughly equal contributions from land and oceans. Approaches based on satellite indices of absorbed solar radiation indicate marked heterogeneity in NPP for both land and oceans, reflecting the influence of physical and ecological processes. The spatial and temporal distributions of ocean NPP are consistent with primary limitation by light, nutrients, and temperature. On land, water limitation imposes additional constraints. On land and ocean, progressive changes in NPP can result in altered carbon storage, although contrasts in mechanisms of carbon storage and rates of organic matter turnover result in a range of relations between carbon storage and changes in NPP.
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              Ecosystem service supply and vulnerability to global change in Europe.

              Global change will alter the supply of ecosystem services that are vital for human well-being. To investigate ecosystem service supply during the 21st century, we used a range of ecosystem models and scenarios of climate and land-use change to conduct a Europe-wide assessment. Large changes in climate and land use typically resulted in large changes in ecosystem service supply. Some of these trends may be positive (for example, increases in forest area and productivity) or offer opportunities (for example, "surplus land" for agricultural extensification and bioenergy production). However, many changes increase vulnerability as a result of a decreasing supply of ecosystem services (for example, declining soil fertility, declining water availability, increasing risk of forest fires), especially in the Mediterranean and mountain regions.
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                Author and article information

                Journal
                bonpi
                Bonplandia
                Bonplandia
                Instituto de Botánica del Nordeste (IBONE) (Corrientes, Corrientes, Argentina )
                0524-0476
                1853-8460
                January 2021
                : 30
                : 1
                : 37-60
                Affiliations
                [3] Tucumán orgnameUniversidad Nacional de Tucumán orgdiv1Facultad de Ciencias Naturales Argentina
                [1] orgnameFundación Miguel Lillo orgdiv1Instituto de Ecosistemas de Aguas Continentales Argentina mtaboada@ 123456lillo.org.ar
                [2] Buenos Aires orgnameConsejo Nacional de Investigaciones Científicas y Técnicas Argentina
                [4] orgnameCONICET orgdiv1UNT orgdiv2Instituto de Biodiversidad Neotropical Argentina
                Article
                S1853-84602021000100037 S1853-8460(21)03000100037
                10.30972/bon.3014589
                cec51e0d-8ef9-4f5c-b112-1aa5d10554cb

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

                History
                : 11 July 2020
                : 27 August 2020
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 94, Pages: 24
                Product

                SciELO Argentina


                laguna,ponds,Yungas,Fitoplancton,NOA,phytoplankton
                laguna, ponds, Yungas, Fitoplancton, NOA, phytoplankton

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