Banca de DEFESA: OSÉIAS MARTINS MAGALHÃES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : OSÉIAS MARTINS MAGALHÃES
DATA : 21/02/2019
HORA: 10:00
LOCAL: sala 34 do ICBS
TÍTULO:

RELATIONSHIPS BETWEEN ENVIRONMENTAL FACTORS AND ALAR AND SEXUAL DIMORPHISMS In ROBUST RHAGOVELIA GOULD, 1931 (INSECTA: HEMIPTERA: VELIIDAE)

PALAVRAS-CHAVES:

Gerromorpha; sexual conflict; sexual selection; dispersal; morphometry; Climatic factors.

PÁGINAS: 75
GRANDE ÁREA: Ciências Biológicas
ÁREA: Parasitologia
RESUMO:

Gerromorpha display two phenomena well studied in temperate areas: alary polymorphism, in
some species individuals can be apterous, micropterous, brachypterous, or macropterous, with
different forms coexisting in a same population; and the variation of somatic characteristics
between males and females, which can be relate to sexual conflict. Rhagovelia robusta Gould,
1931 is a species where both phenomena are evident. Thus, the present dissertation aims to
define the relations between alary and sexual dimorphism in R. robusta, as well as the role of
environmental factors in the determination of alary forms. We evaluated patterns of shape and
size in different alary forms and sexes of R. robusta and the relations between alary and sexual
dimorphisms. Our results shows the significant variations on certain structures between males
and females, as well as between males of different alary forms. Males presents allometric
modifications on the pronotum and posterior femur, and appear are integrated to each other.
Such integration is tied to the adaptive responses to the needs for dispersal and reproduction.
Subsequently, we analyzed how environmental factors influence the abundance of alary forms
of R. robusta. Our results show that different climatic conditions, occurring during the
developing period of the individuals, influence the abundance of the alate morphotype. A
higher abundance is associated to higher mean temperatures and rainy seasons, while it is
negatively affected by lower temperatures and dry seasons. These results reflect the adaptation
of the species, through the different morphotypes, to the variable resource availability through
time. During dry seasons, the environment is more homogeneous and there are less resources,
thus it is less viable to invest in the flight apparatus and the costs involved in the dispersion.
On the other hand, the apterous males that are proportionally more abundant during these
periods have higher copulation capacity, ensuring a higher reproduction rate and the continuity
of the species in the habitat. During high pluviosity seasons, with higher heterogeneity and
resource availability, it is possible to invest more in the development of alate individuals and
in the dispersion to new areas.

MEMBROS DA BANCA:
Interno - 106.487.357-02 - FELIPE FERRAZ FIGUEIREDO MOREIRA - UFRJ
Externo à Instituição - FERNANDA AVELINO CAPISTRANO DA SILVA
Presidente - 387200 - FRANCISCO GERSON ARAUJO
Externo à Instituição - TATIANA NASCIMENTO DOCILE