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Previous issue date: 2010-05-21 === Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico, CNPq, Brasil. === Morphodynamism, extratification and seasonality are among the main factor to influence
the composition and abundance of the macroinfauna in sandy beaches. The macroinfauna
of two sandy beaches were sampled between winter-2005 and summer-2006 during low
tide; one beach was protected (Flamengo beach) located in Guanabara bay, and the other
was exposed to waves in the oceanic zone (Grumari beach). The hypothesis that the
physical characteristics of the beaches determine the difference in composition and relative
abundance of the macroinfauna was tested. Flamengo beach was characterized as
dissipative and had comparatively higher t?xon richenes and lower biomass, when
compared with Grumari beach that was classsified as reflective. In Flamengo beaches,
higher abundance was recordded for Enoploides sp, and Emerita brasiliensis, whereas in
Grumari beach Sacocirrus sp and E. brasiliensis were the most abundant taxons. The
beaches showed highe dissimilarity in composition and relative abundance of the taxons
(91.75%). Sacocirrus sp, Enoploides sp, Dispio uncinata, Scolelepis goodbobyi and E.
brasiliensis explained 63.70% of the dissimilarity between the two beaches. In both
beaches, we observed extratification in occurence and abundance of the macroinfauna in
two seasons. Emerita brasiliensis occurred mainly in Grumary beach in the extrate 1 and
Sacocirrus sp in extrate 2, while in Flamengo beach E. brasiliensis and Enoploides sp had
the highest abundance in extrate 1 and S. goodbody and D. uncinata in extrate 3. The
hypothesis that the macrofauna differs among extrate and beaches was accepted and the
differences in composition and relative abundance of the macroinfauna were attributed to
morphodynamism, althought other environmental factores can be influencing such
differences. === O morfodinamismo, estratifica??o e a sazonalidade s?o os fatores mais importantes na
determina??o da composi??o e abund?ncia da macroinfauna em praias arenosas. A
macroinfauna de duas praias foi amostrada no inverno/2005 e ver?o/2006 durante a mar?
baixa, sendo uma praia protegida (Flamengo) localizada na ba?a de Guanabara, e outra
praia exposta localizada na zona oce?nica (Grumari). Foi testada a hip?tese que as
caracter?sticas f?sicas das praias determinam diferen?as na composi??o e abund?ncia da
macroinfauna. A praia do Flamengo foi caracterizada como dissipativa e apresentou maior
riqueza de t?xons, e menor biomassa, quando comparada com a praia de Grumari
classificada como refletiva. Na praia do Flamengo as maiores abund?ncias foram
registradas para Enoploides sp, e Emerita brasiliensis, enquanto em Grumari foram
Sacocirrus sp e E. brasiliensis. As praias apresentaram elevada dissimilaridade na
composi??o e abund?ncia relativa dos t?xons (91.75%), Sacocirrus sp, Enoploides sp,
Dispio uncinata, Scolelepis goodbobyi e E. brasiliensis explicaram 63.70% das diferen?as
entre as praias. Em ambas as praias foram observadas estratifica??es na ocorr?ncia e
abund?ncia da macroinfauna nas duas esta??es analisadas. Na praia de Grumari, E.
brasiliensis ocorreu principalmente no estrato 1 e Sacocirrus sp no estrato 2, enquanto na
praia do Flamengo E. brasiliensis e Enoploides sp apresentaram as maiores abund?ncias no
estrato 1 e S. goodbodyi e D. uncinata no estrato 3. A hip?tese da varia??o na composi??o
da macroinfauna entre os extratos foi aceita, e as diferen?as observadas na composi??o e
abund?ncia da macroinfauna foram atribu?das ao morfodinamismo; no entanto, outros
fatores ambientais podem estar relacionados com tais diferen?as.
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