en Ecology Ecology پژوهشي Orginal research papers <p>The invasion of <em>Spartina alterniflora</em> significantly affected the local ecosystem of Western Pacific Ocean where <em>Moerella iridescens</em> lives. Five patches with different invasion stages of <em>S. alterniflora</em> were selected and the influence on distribution of<br> <em>M. iridescens</em> was studied on the coast of Wenzhou Bay, China in 2007. The aggregated distribution pattern was proved by using Taylor&#39s power regression and Iwao&#39s plot regression methods (<em>p</em><0.001). The densities were significantly affected by the factors of <em>S. alterniflora</em> invasion stage and season (<em>p</em><0.001), but no significant effect of interaction (<em>p</em>=0.805) occurred. <em>M. iridescens</em> mainly clumped in the habitats of no invasion and initial invasion of <em>S. alterniflora</em> was in the high tidal zone, and the lowest density was recorded where complete invasion occurred. The densities were larger in warmer than in cooler seasons. There were significant positive correlations among the average densities in seasons. Density variation must be the response of <em>M. iridescens</em> to the environment, including <em>S. alterniflora </em>invasion stage, temperate stress and interspecific associations.</p> Coastal wetland, Distribution pattern, Habitats, Lingkun Island 108 117 http://jifro.ir/browse.php?a_code=A-10-411-2&slc_lang=en&sid=1 B.M Ge gebaoming@gmail.com 100319475328460015099 100319475328460015099 Yes D.Z Zhang 100319475328460015100 100319475328460015100 No B.P Tang 100319475328460015101 100319475328460015101 No Y.X Bao 100319475328460015102 100319475328460015102 No J Cui 100319475328460015103 100319475328460015103 No Z.Y Hu 100319475328460015104 100319475328460015104 No