Macrofauna composition of two beaches with distinct morphodynamism degrees in the beach arc Barra de São João – Ponta Pai Vitorio promontory – RJ.

V. Veloso, Fernanda Costa de Andrade, Rubens José Massud Ribeiro
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Abstract

This study was performed in the intertidal zone of Rasa and Unamar beach, located in the beach arc Barra de Sao Joao – Ponta do Pai Vitorio Promontory, northern coastline of Rio de Janeiro, a poorly studied area. In order to assess the macrofauna composition samplings were carried out at both beaches on winter of 2003 and summer of 2004. The differences between the beaches are significant regarding both morphodynamic and macrofaunal composition. The Unamar beach is narrow and has a steeper slope, where waves reach directly the foreshore, being classified as reflective with a typical fauna of this morphodynamic stage, where crustaceans were the dominant taxon represented by Emerita brasiliensis , Excirolana braziliensis , Atlantorchestoidea brasiliensis  and Lepidopa richmondi . Rasa beach, on the other hand, has a larger width with a gentle slope and an extense surf zone, classified as dissipative, with Dean’s Morphodynamic index (Ω) equal to 5,1 and 8,5 respectively on winter and summer. The fauna is richer and extremely distinct from other beaches in Rio de Janeiro state, presenting unique species, as Talorchestia tucurauna , Platorchestia monodi , Aspidosiphon (Aspidosiphon) muelleri and Austinixa patagoniensis . The coleopteran Bledius hermani also found at this beach represents the first occurrence to Rio de Janeiro.
Barra de s o jo - Ponta Pai Vitorio海岬- RJ两个形态动力程度不同海滩的大型动物组成。
本研究在Rasa和Unamar海滩的潮间带进行,该海滩位于Barra de Sao Joao - Ponta do Pai Vitorio Promontory海滩弧,巴西里约热内卢北部海岸线,这是一个研究较少的地区。为了评估大型动物组成,于2003年冬季和2004年夏季在两个海滩进行了采样。在形态动力学和大型动物组成方面,海滩之间的差异是显著的。乌纳玛尔海滩坡度较窄,坡度较陡,波浪直接到达前滩,属于反射型海滩,具有典型的这一形态动力学阶段的动物群,甲壳类为优势类群,以Emerita brasiliensis、Excirolana brasiliensis、Atlantorchestoidea brasiliensis和Lepidopa richmondi为代表。而Rasa海滩宽度较大,坡度平缓,浪带较广,属于耗散型,冬季和夏季的Dean’s形态动力指数(Ω)分别为5,1和8,5。动物群丰富,与巴西里约热内卢州的其他海滩截然不同,呈现出独特的物种,如Talorchestia tucurauna, Platorchestia monodi, Aspidosiphon (Aspidosiphon) muelleri和Austinixa patagoniensis。在这片海滩上发现的鞘翅目Bledius hermani也是首次在巴西里约热内卢发现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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