Temperature and turbidity as drive forces to the growth of Egeria densa (Planchon) under to controlled conditions

Autor(es)

Machado, R. ^[1] ; Bianchini, I ^{[1, 2]} ; Cunha-Santino, M. B. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Postgrad Program Ecol & Nat Resources, Highway Washington Luiz, Km 235 Mailbox Postal 676, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Hydrobiol, Highway Washington Luiz, Km 235 Mailbox 676, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Aquatic Botany; v. 164, MAY 2020.
• Citações Web of Science: 0

Resumo

The development of an aquatic community may reflect anthropogenic influence on adjacent areas of a freshwater system. Mathematical modeling of the growth of a species is a predictive tool that can be useful for planning management strategies In this study, a kinetic model was used to evaluate the growth of submerged macrophyte Egeria densa under laboratory conditions that simulates growth in function of the temperature and turbidity increasing as drive forces to the growth. Incubations were prepared with E. densa individuals which were maintained in controlled condition (25 and 27 degrees C and four turbidity conditions (0% - the control, 18.5 %, 37 % and 55.5 %). Mathematical modeling of macrophyte turbidity growth indicated that macrophyte growth exhibited an average doubling time (dt) varying from 7.83 and 12.04 days. Increased turbidity resulted in growth stress for E. densa. This species showed great temperature sensitivity (Q(10) = 3.0) and higher growth potential at 27 degrees C when compared to 25 degrees C, a situation verified by growth coefficients (90.44 % more). The soil used (Quartzarenic Neosol) contributed to the growth of E. densa, due to the nutrient content in its composition. Increased turbidity resulted in stress for E. densa, resulting in changes of the growth patterns. The results generated may contribute to the development of new approaches and provide support for management, especially in relation to neotropical aquatic systems located in the Brazilian savanna. (AU)

• Processo FAPESP: 18/00348-0 - Modelagem matemática do crescimento de Ricciocarpus natans em distintas concentrações de Mn e Cd: potencial fitorremediador e indicadores fisiológicos e bioquímicos
• Beneficiário: Marcela Bianchessi da Cunha Santino
• Modalidade de apoio: Auxílio à Pesquisa - Regular