Mesozooplankton Structure and Seasonal Dynamics in Three Coastal Systems of Argentina: Bahía Blanca Estuary, Pirámide Bay, and Ushuaia Bay.

BERASATEGUI ANABELA; LÓPEZ ABBATE, MARÍA CELESTE; DAGOSTINO, VALERIA C; PRESTA MARÍA LAURA; UIBRIG, ROMÁN; GARCÍA, TAMI M; NAHUELHUAL, EUGENIA; CHAZARRETA C. JAVIER.; DUTTO MARÍA S; GARCÍA MAXIMILIANO; CAPITANIO FABIANA; HOFFMEYER MÓNICA S.

Plankton Ecology of the Southwestern Atlantic

Springer International Publishing AG, part of Springer Nature 2018

Lugar: Cham; Año: 2018; p. 327 - 347

Abstract Mesozooplankton communities in coastal ecosystems have successfullyadapted to a wide range of environments. However, the current rate of coastal modification is challenging the survival of resident species. In this chapter, we describe the structure and annual dynamics of the mesozooplankton community in recent years for three coastal systems in Argentina that are subject to human disturbance: (1) Bahía Blanca Estuary, (2) Pirámide Bay in Nuevo Gulf and (3) Ushuaia Bay in the Beagle Channel. The seasonal dynamics of mesozooplankton abundance in Bahía Blanca Estuary during 2009?2010 exhibited a unimodal pattern with an increase during the warm seasons, while organism abundance increased linearly with both salinity and turbidity. In Nuevo Gulf, research on the seasonal dynamics of mesozooplankton conducted during 2014?2015 exhibited a bimodal abundance pattern with peaks in late summer and spring. No significant relationships between mesozooplankton and the environmental variables included in Nuevo Gulf werefound. The seasonal dynamics of mesozooplankton in Ushuaia Bay in the years2006?2008 exhibited a bimodal abundance pattern with peaks in summer and earlyautumn; this pattern was mainly driven by the concentration of chlorophyll a. InBahía Blanca Estuary, a gradual decrease in species richness was observed throughout the last four decades, while changes in species composition were also observed, suggesting that some species have the ability to acclimate to higher salinity and turbidity as well as to pollution. In Nuevo Gulf, the mesozooplankton community showed no significant modifications over time, which may be related to the low anthropogenic pressure. Although no profound shifts in mesozooplankton were observed in Ushuaia Bay, eutrophication may have an impact in the future through its effect on primary producers.