{"refrec":{"BRefID":238418,"RR":"<b>Van Tomme, J.; Van Colen, C.; Degraer, S.; Vincx, M.</b> (2012). Encounter competition partly explains the segregation of the sandy beach amphipods <i>Bathyporeia pilosa</i> and <i>Bathyporeia sarsi</i>. A mesocosm experiment. <i>J. Exp. Mar. Biol. Ecol. 438</i>: 118-124. <a href=\"http://dx.doi.org/10.1016/j.jembe.2012.09.012\" target=\"_blank\">dx.doi.org/10.1016/j.jembe.2012.09.012</a>","BEntID":230105,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":null,"RefStringPartII":". <i>J. Exp. Mar. Biol. Ecol. 438</i>: 118-124. <a href=\"https://dx.doi.org/10.1016/j.jembe.2012.09.012\" target=\"_blank\">https://dx.doi.org/10.1016/j.jembe.2012.09.012</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Van Tomme, J.; Van Colen, C.; Degraer, S.; Vincx, M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Van Tomme, J. <i>et al.</i>","Englishabstract":"Biotic interactions such as competition and predation are known to play an important role in structuring communities. In this study, the intra- and interspecific competition between two congeneric sandy beach amphipods <em>Bathyporeia pilosa</em> and <em>B. sarsi</em> was examined by means of a two-way factorial mesocosm experiment. The amount of natural food resources as well as population densities of <em>B. pilosa</em> and <em>B. sarsi</em> were manipulated in order to investigate whether firstly, the species compete for food, and secondly, whether crowding effects, such as damaging encounter competition, are present within and between both <em>Bathyporeia</em> species. The absence of food negatively influenced survival and recruitment and enhanced aggressive behavior in the <em>B. sarsi</em> population, while there was no influence of the absence of food in the <em>B. pilosa</em> population. In the field, <em>B. pilosa</em> is occurring high in the intertidal where food supply is low, while <em>B. sarsi</em> is occurring in the mid-intertidal where food supply is higher. Hence, <em>B. pilosa</em> is more adapted to low food conditions than <em>B. sarsi</em>. Although an increased intraspecific density stimulated encounter competition within the <em>B. sarsi</em> population, no evidence of interspecific competition was found in this study. This first report on encounter competition for the deposit-feeding amphipod <em>Bathyporeia sarsi</em> suggests that zonation patterns of the two amphipods may be the result of the combined influence of species-specific physiological restrictions and biotic interactions within the <em>B. sarsi</em> population, indicating that on dissipative beaches, biotic interactions may be more common than generally considered.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Encounter competition partly explains the segregation of the sandy beach amphipods <i>Bathyporeia pilosa</i> and <i>Bathyporeia sarsi</i>. 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