História natural de Notodiaptomus amazonicus (Wright, 1935) em lago de área urbana protegida no lavrado de Roraima (Copepoda: Calanoida: Diaptomidae)
The study addresses to the copepods natural history of an urban lake in a protected municipal area in the lavrado of Roraima, whose lake has the characteristic of being the unique remnant of urban lakes in Boa Vista. The lake has a round format, measuring near 60 meters in diameter. The research...
| Autor principal: | Geraldes Primeiro, Luis José de Oliveira |
|---|---|
| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
|
| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/11407 http://lattes.cnpq.br/7042477799996664 |
| Resumo: |
|---|
|
The study addresses to the copepods natural history of an urban lake in a protected municipal
area in the lavrado of Roraima, whose lake has the characteristic of being the unique remnant
of urban lakes in Boa Vista. The lake has a round format, measuring near 60 meters in
diameter. The research was related to the population structure of the copepodes of the lake.
The samples were taken in six visits during December 2014, the dry period of the region,
covering three microhabitats: margin with vegetation of gramineans and cyperaceans,
limnetical portion and margin with absent vegetation. Each visit corresponded to a sample in
one microhabitat – in all 6 samples per microhabitat. These samples also encompassed three
phases of the lake – full waters, empting and critical levels of the water. Four questions
guided the study concerning the proportions of adults (male and female), copepodits
(juveniles) and náuplius (larvae) inside and between the microhabitats. Each question had its
respective hypothesis, considered the provisory answer to the question, which results allowed
some inferences on the dynamics of the studied copepod population. The main results related
to these four questions were: First – i) the proportion of adults and copepodits were greater
than the náuplius in the thre microhabitats, ii) the proportion of náuplius, copepodits and
adults were greater in the limnetical portion, iii) the proportion of adults was fewer in the
margins with vegetation. Second – i) the sexual ratio was 1:1 among the three microhabitats,
ii) inside the three microhabitats the proportion between males and females was also 1:1.
Third – in the three microhabitats the proportion of females carrying eggs was slightly greater
when the lake was full or empting, ii) female carrying eggs was equally distributed in the
three microhabitats when the lake was full, iii) the proportion of females carrying eggs was
greater in the center and in the margin without vegetation when the lake was in its critical
water level. Fourth – i) among the three phases of the lake – full, emptying and critical levels
of the water – the copepodits and males and females adults were more abundant than
náuplius, ii) the proportion of náuplius was homogenous and more abundant in the high levels
of water (full and emptying), less abundant in the critical levels of water, iii) the copepodits
were more abundant when the lake was emptying, but homogenous in the extreme phases–
full and critical levels, iv) adult males and females had its abundance reduced at the same
proportion as the water was decreasing in a sequence of full water, empting and critical levels
of water. |