Abstract

GIORGI, ADONIS et al. Honey Locust (Gleditsia triacanthos L. (Fabaceae)) Invasion Effect on Temperature, Light and Metabolism of a Pampean Stream. Acta biol.Colomb. [online]. 2014, vol.19, n.1, pp.99-106. ISSN 0120-548X.  https://doi.org/10.15446/abc.v19n1.38384.

The establishment of invader species in a region generally modifies the ecosystems where they are introduced. In this study we analyze the effect produced by a Gleditsia triacanthos (honey locust) invasion on a pampean stream. This organism modifies the temperature and the light reaching the stream. Thermal range shows significant differences between reaches but mean temperatures are similar in both reaches. Radiation diminished between 85 and 95 % down the trees. These modifications reduce the primary gross production of 2.7 to 1.7 g O2. m-2 at spring and of 25 to 20 g O2. m-2 at summer. Respiration in spring and summer is halved at invaded reaches, but net ecosystem metabolism is similar in both reach and seasons. Moreover, the reach invaded by honey locust show scarce macrophytes. We argue that the honey locust reduces the diversity by reduction of macrophytes and their associated organisms but also reduce the primary production causing changes in the food web.

Keywords : metabolism; streams; woody invaders.

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