Is recruitment of the temperate sand goby,sagamia geneionema, affected by habitat patch characteristics?
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The temperate annual goby,Sagamia geneionema, showed pronounced spatial variation in recruitment among 8 isolated sand patches within a 1-ha area at Aburatsubo, Miura Peninsula, central Japan. Investigations were conducted to determine if such among-patch variation stemmed from differences in patch attributes, including patch size, sediment grain size, food availability, and densities of predators and heterospecific residents. No relationship between recruit density and each of the 5 attributes measured was found, although among-patch variability in patch attributes was apparent. This result suggests that recruitment was not influenced by patch characteristics. The mechanisms that produce among-patch variation in recruitment may be explained in part, by the aggregating behavior of presettlement individuals in the water column above the sand patches.
Key wordsRecruitment variation Sagamia geneionema sand patch attributes settlement
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