Produtividade primária, biomassa e fatores limitantes na área estuarina SW da Baía de Todos os Santos

Abstract

The pnmary production by Ci4 , standing crop as ratio of particulate carbon/nitrogen and biossay tests c(Jncerning to dissolved nitrogen and phosphorus were investigated in the SW estuarine J7langrove area of the Bay of Todos os Santos (Brazil) during 10 months. The phyto• plankton displaied in this area a mean densit)! of 9x 1 OJ cells lliter. The primary productivity show,ed an aver.age rang~ 0[y.52 to 10.93 mgC / 1m 3 Ih, representing the rate about 45 g C Im] Iyear or 18 1 g C 1m 2 /year. Phy toplankton fraction under 35J1 at the stations O and 1 was responsible for the most C14 uptake. A nega tive relationship between primary production and limiting nitrogen and phosphorus was verified. Fe• bruary samples exhibited the 'V0st drastic situation regarding to N and P, as limiting factors ; an opposite sitl!.tyi271.ss>~SEQ'1!kdJ.o June and Ju1x., The relationship between particulated carbon and nitrogen showed a concentration area among the ranges of 400/ 1400 mgC/m3 / and 4128 mg lV 1m 3 , The rarios CIN revealed the most of times a shorr variation.

Ciclo gametogênico e comportamento reprodutivo de Iphigenia brasiliana (Mollusca, Bivalvia, Donacidae) no estuário do rio Subaé, Baía de Todos os Santos, Bahia, Brasil

“…pequena amplitude em toda essa região (Paredes et al, 1980), o que pode ter provocado um atraso na maturação inicial da população. O estudo demonstrou que existe semelhança entre características do desenvolvimento gonadal de I. brasiliana e outros bivalves, sugerindo certa padronização do ciclo gametogênico em Bivalvia.…”