Variação temporal do zooplâncton da Praia de Tramandaí, Rio Grande do Sul, com ênfase em Copepoda

Abstract

ABSTRACT. Temporal variation of the zooplankton from Tramandaí Beach, RS, southern Brazil, with emphasis on Copepoda. The temporal variability of density, species composition, biomass and diversity of the surf zone zooplankton from Tramandaí Beach, RS, Brazil, was studied between August 2005 and August 2006. Samples were taken forthnightly using a zooplankton net of 150 cm total length, 50 cm mouth diameter and 300 µm nylon mesh size. Data on clorofila-a, wind direction, longshore current, salinity, air and water temperature were taken as well. Copepoda presented the highest species diversity, being Temora turbinata (Dana, 1849) the species with higher relative abundance and frequency of occurrence. Other Copepoda species were also numerically important, such as Acartia tonsa (Dana, 1849), Subeucalanus pileatus (Glesbrecht, 1888) and Ctenocalanus vanus (Glesbrecht, 1888). The Mysidacea Metamysidopsis elongata atlantica (Bascescu, 1968) presented frequency of 58.33% and relative abundance of 44%. The peak of mesozooplanktonic biomass (96 mg.m -³) was recorded in September/2005, corresponding to the maximum density value presented for this species (3,535 org.m -³). Information about zooplankton of this region is scarce and the results of this study will provide a base for the knowledge about the biological processes occurring in the surf zone of Tramandaí Beach.

Assessment of surf zone zooplankton dynamics in a Southwestern Atlantic sandy beach: Seasonal cycle and tidal height influence

“…Studies conducted in other sandy beaches mentioned the presence of A. tonsa (Avila et al, 2009;Stull et al, 2016) and P. parvus (Avila et al, 2009) in surf waters, although only the former as numerically important. Additionally, some other Paracalanidae species like Paracalanus quasimodo and Paracalanus aculeatus are common and can dominate surf waters of Brazilian beaches (Avila et al, 2009;Costa et al, 2011;Pinheiro et al, 2011Pinheiro et al, , 2013. The bentho-pelagic E. acutifrons has been also reported in surf waters of Ajuruteua beach in Northern Brazil, but as dominant taxon (Costa et al, 2011;Pinheiro et al, 2011Pinheiro et al, , 2013.…”

“…tropical and/or subtropical beaches (Avila et al, 2009;Costa et al, 2011;Pinheiro et al, 2011Pinheiro et al, , 2013Oliveira-Santos et al, 2016). These studies evidenced that seasonal variation in precipitation and the associated changes in salinity, are the main factors influencing the tropical and subtropical zooplankton communities (Costa et al, 2011;Pinheiro et al, 2011).…”

“…Zooplankton spatial and temporal dynamics and their relationship with the hydrological variables has been extensively studied in several types of coastal systems (e.g. David et al, 2005;Marques et al, 2007Marques et al, , 2009Leandro et al, 2007), however, there have been very few studies in sandy beach surf zones (DeLancey, 1987;Avila et al, 2009;Costa et al, 2011;Pinheiro et al, 2011Pinheiro et al, , 2013Aboul-Ezz et al, 2014;Oliveira-Santos et al, 2016;Stull et al, 2016). Moreover, a very limited number of these studies provide estimates of abundance and/or biomass (McLachlan and Defeo, 2018) and most of them are focused on…”

Long-term site fidelity and residency patterns of bottlenose dolphins (Tursiops truncatus) in the Tramandaí Estuary, southern Brazil

“…1984). Sea-surface temperatures in the region range along the year from 13°C to 25°C, with a mean of 18°C (Avila et al, 2009).…”

Biodiversidade, distribuição, alimentação e papel trófico de misídeos marinhos (Crustacea, Peracarida, Mysida)

“…Brazil: São Paulo, Ubatuba (Băcescu 1968c), São Sebastião (Fries 1999), Una do Prelado River (Lansac Tôha & Lima 1993), and Cananeia estuary (Almeida Chapter 3); Santa Catarina (Rörig et al 1997;Resgalla 2011); Rio Grande do Sul, Tramandaí Beach (Avila et al 2009), Lagoa dos Patos estuary (Gama 2008;Avila et al 2011), and Cassino Beach (Bersano 1994;Avila et al 2011).…”