Banca de QUALIFICAÇÃO: VANESSA NEGRÃO RODRIGUES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : VANESSA NEGRÃO RODRIGUES
DATA : 13/11/2018
HORA: 14:00
LOCAL: Instituto de Ciências Biológicas - UFPA
TÍTULO:

"Growth analysis and hydraulic adjustments in seedlings of two mangrove species in a salinity gradient"

PALAVRAS-CHAVES:

Climate changes. Ecological xylem anatomy. Growth. Hydraulic conductivity. Salinity stress.

PÁGINAS: 30
GRANDE ÁREA: Ciências Biológicas
ÁREA: Botânica
RESUMO:

Global climate change will cause many consequences for the environment. Among the most
threatened ecosystems are the mangroves. These ecosystems are among the major providers of
ecological and socioeconomic services. The increase of salinity is one of the main factors related to
climate change that will affect mangroves. Salinity is the main environmental condition that
generates stress to the mangroves, because saline soil leads the species the constant risk of
cavitation. Cavitation reduces the plant's hydraulic conductivity, affecting development and may
lead to the individual death. With the prediction of salinity increase, water transport must be even
more difficult and more subject to failure, with different species developing different adjustments
to tolerate salt increase. Knowing this, the present study seeks to verify the growth, hydraulic and
anatomical adjustments of two mangrove species in a salinity gradient answering the following
questions: i) How do different levels of salinity affect the water relations, growth and survival of
the species?; ii) Do species develop anatomical and hydraulic adjustments to grow and survive at
different levels of salinity?; (iii) Are there differences in species responses to salinity levels?; iv)
Will the species' responses to salinity levels change during the study? To answer these questions,
seedlings of Rhizophora racemosa G. Mey. (Rhizophoraceae) and Avicennia germinans (L.) L.
(Acanthaceae) will be used in 5 salinity treatments (0g, 10g, 20g, 40g and 55g) for 12 weeks. For
each of the two species and in each salinity treatment, growth, water potential, pressure-volume
and vulnerability curves and wood anatomy will be performed. From these results, we can know
the salinity tolerance limits of the species, understand the most efficient mechanisms developed by
the species to tolerate high salinity rates, evaluate if the species present different mechanisms and
whether growth, survival and hydraulic and anatomical characteristics of the species to tolerate
increased salinity change during the experiment due to plasticity mechanisms.

MEMBROS DA BANCA:
Interno - 377.382.402-53 - ELY SIMONE CAJUEIRO GURGEL - MPEG
Presidente - 079.651.076-86 - GRAZIELLE SALES TEODORO - UFPA
Externo à Instituição - MARKUS GASTAUER - ITV
Interno - 044.649.569-71 - THAÍSA SALA MICHELAN - UFPA