Distribution patterns of supralittoral arthropods: wrack deposits as a source of food and refuge on exposed sandy beaches (SW Spain)

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• 作者：Ma Carmen Ruiz-Delgado (1)
  Ma José Reyes-Martínez (1)
  Juan Emilio Sánchez-Moyano (2)
  Jesús López-Pérez (3)
  Francisco José García-García (1)
  
• 关键词：Wrack ; Season ; Supralittoral arthropods ; Habitat heterogeneity ; Microclimatic conditions ; Food availability
• 刊名：Hydrobiologia
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：742
• 期：1
• 页码：205-219
• 全文大小：737 KB
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• 作者单位：Ma Carmen Ruiz-Delgado (1)
  Ma José Reyes-Martínez (1)
  Juan Emilio Sánchez-Moyano (2)
  Jesús López-Pérez (3)
  Francisco José García-García (1)
  
  1. Laboratorio de Zoología, Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, Ctra. Utrera Km 1, 41013, Sevilla, Spain
  2. Departamento de Zoología, Universidad de Sevilla, Av. Reina Mercedes 6, 41012, Sevilla, Spain
  3. Departamento de Ecología y Biología Animal, Facultad de Ciencias del Mar, Universidad de Vigo, 36310, Vigo, Spain
  
• ISSN：1573-5117

文摘

Wrack deposits are a common feature of sandy beaches worldwide. Despite their relevance, the habitat features of wrack debris and their potential influence on the distribution of upper shore arthropods remain poorly understood. In this study, the distribution of supralittoral arthropods was analysed by sampling areas covered and not covered by wrack on two tidal levels during winter and summer from two sandy beaches of south-western Spain. Despite the differences between beaches and seasons, density, species richness and diversity were significantly higher in wrack patches than in bare sand. Moreover, community structure and composition varied between both microhabitats due to the influence of wrack deposits on the habitat selection by arthropod species. Food availability combined with temperature or moisture mostly explained the distribution pattern of assemblages. Moreover, these habitat features varied between wrack bands, the lower band being fresher and wetter than upper band. The density of the main species inhabiting wrack was correlated mainly with moisture. The present study provides evidences about the role of algal wrack structuring diversity and composition of supralittoral arthropods stressing the importance of the habitat heterogeneity to maintain abundant and diverse communities on exposed sandy beaches.