Banca de DEFESA: DILENE GOMES LICÁ DE MELO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : DILENE GOMES LICÁ DE MELO
DATE: 31/05/2022
TIME: 14:30
LOCAL: Google Meet
TITLE:

EFFECTS OF SHADOWING AND EUTROFIZATION ON THE DEVELOPMENT OF AN INVASIVE MACROPHYTE

KEY WORDS:

Biodiversity. Conservation. Urochloa arrecta. Aquatic ecosystems. Vegetative reproduction.

PAGES: 41
BIG AREA: Ciências Biológicas
AREA: Botânica
SUMMARY:

Aquatic macrophytes are key elements for the maintenance and balance of aquatic ecosystems as they play important roles. They participate in the cycling of nutrients, in the food chain as primary producers and in the production of biomass. Dispersal and colonization come through vegetative reproduction and, depending on the environmental conditions they encounter, they are established. Urochloa arrecta is a Poaceae from Africa with high regeneration potential and can be aggressive in aquatic environments. The objective of this work was to experimentally evaluate the effect of different levels of shading and eutrophication on the growth of the species under study, Urochloa arrecta. For this, structures and all necessary materials were assembled to start the experiment in the year 2021 with duration of 98 days. Shading was simulated using shade levels (0, 30, 60 and 80%) and nutrient concentration simulation (S- no addition, M- 5g addition and B- 10g nutrient addition). At the end of the experiment, the plants that developed were extracted, washed, measured, dried and weighed. The response variables measured were the number of shoots, height, aerial biomass and root biomass. To answer our objective, the Generalized Linear Model was used to perform the statistical test. Our results showed that for the number of shoots, height, and root biomass, there was a significant effect on nutrient concentration. While in aerial biomass there was a significant interaction between treatments (shading and nutrient concentration). In this work, we identified that nutrient concentration plays a very important and significant role in the clonal growth of propagules of the Urochloa arrecta species. The information from this study is relevant for the regulation of the invasive potential of the species under study in the aquatic environment to avoid its proliferation and future damages in ecological interactions and to conserve aquatic biodiversity.

BANKING MEMBERS:
Externa à Instituição - Vanessa de Carvalho Harthman - UFMS
Interna - 377.382.402-53 - ELY SIMONE CAJUEIRO GURGEL - MPEG
Interno - 935.172.972-91 - MOZANIEL SANTANA DE OLIVEIRA - MPEG
Externo à Instituição - MÁRCIO JOSÉ DA SILVEIRA - UEMG
Presidente - 044.649.569-71 - THAÍSA SALA MICHELAN - UFPA