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Padrões dinâmicos de transporte e migração do zooplâncton, com ênfase nos Decapoda planctônicos, da Barra de Catuama, Pernambuco, Brasil

2006; Fundação de Amparo à Pesquisa do Estado de SP; Volume: 6; Issue: 3 Linguagem: Inglês

10.1590/s1676-06032006000300023

ISSN

1678-7927

Autores

Mauro de Meló Júnior,

Tópico(s)

Crustacean biology and ecology

Resumo

Studies about the zooplankton flux between the Santa Cruz Channel (SCC) - at Catuama inlet - and the Adjacent Continental Shelf (ACS) were carried out to quantify this exchange and to define the planktonic Decapoda transport mechanism and migration. Sampling were done at spring (05 and 06/08/2001) and neap (11 and 12/08/2001) tides, each 3 hours interval, during 15 hours at spring tide (n = 32 samples) and 24 hours at neap tide (n = 56 samples). The samples were collected in three fixed stations (Middle or Convergence, Continent and Island) in three depths (surface, middle and bottom). Each sample was obtained with a pump and the water was filtered through a plankton net (300 µm), from 3 to 5 minutes. After collection the samples were fixed with 4% neutralized formaldehyde. Simultaneous current velocity and direction data were obtained using an acoustic current profile (ADCP), besides temperature, salinity and dissolved oxygen data. In laboratory, the samples were weighted to obtain the plankton biomass wet weight. Each sample was totally inspected under a estereomicroscope. The Catuama Inlet presented a high biomass data variability, with higher values mainly during the spring tide. The instantaneous biomass average transport was 98.10±75.92 mg.m-2.s-1, during spring tide, and of 31.46±26.52 mg.m-2.s-1, during neap tide. Higher biomass transport levels were associated to high density of Brachyura, Calanoida and Sergestoida. In relation to the organisms average transport the values were 831.47±1192.53 org.m-2.s-1, during spring tide and of 342.33±445.80 org.m-2.s-1, during neap tide. Higher biomass and organisms transport were observed during the night (flood and ebb tides). The importation and exportation flux did not present significative differences (p>0.05), suggesting that in some periods of the year the values can have the same magnitude order. Probably, this was caused by a strong marine influence in the studied area due estuarine fronts in the S

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