Descripción: The coast of Lobería and Necochea is characterized by cliffsand narrow beaches. The inlet of the Quequén Grande river used to alter the coastline. The construction of jetties related to the Quequén Harbour induced huge accumulations of sand towards Necochea, and a critic erosive process of cliff and beach to the east. Beach width reduces from 300 m at the west to 40-60 m to the east. Considering regional sand scarcity, the eastern beaches are characterized by more sand variability. Greater variations in the sand balance were assigned to human activity. Waves coming from the E, SE and S deliver more energy along this eastern sector. On the other hand, submerged zones of these beaches have less availability of sand. Greater availability of fine sand was recognized towards Necochea. The Quequén Grande river has much effect on the estuarine dynamics during ENSO-triggered floods, although sedimentation is dominated by silt supply.

Descripción: This is the second contribution to the study of lignicolous marine fungi from the coast of Mar del Plata city, Argentina. Twelve species were collected from driftwood, intertidal wood and drift culms found in rocks and sand beaches. Ten species of Ascomycotina are described: Buergenerula spartinae Kohlm. & R. V. Gessner, Chaetosphaeria chaetosa Kohlm., Corollospora maritima Werderm., Halosarpheia trullifera (Kohlm.) E. B. G. Jones, S. T. Moss & Cuomo, H. viscosa (I. Schmidt) Shearer & J. L. Crane ex Kohlm. & Volkm-Kohlm., Halosphaeriopsis mediosetigera (Cribb & J. W. Cribb) T. W. Johnson, Wettsteinina marina (H. Ellis & Everh.) Shoemaker & C. E. Babc., Leptosphaeria oraemaris Linder, Passeriniella obiones (P. Crouan & H. Crouan) K. D. Hyde & Mouzouras, Remispora maritima Linder; one species of Deuteromycotina: Phoma glomerata Wollenw. & Hochapfel and one species of Basidiomycotina: Digitatispora marina Doguet. Seven are new records for Argentina and four of them also for South America.