Turrids in the Outer Barrier Reef, Northeast Bohol, Philippines from Lumun-Lumun Nets

Romell A. Seronay, Porfirio M. Ali\~{n}o, Baldomero M. Olivera

Abstract


The micro turrids in the sandy sediments substrata of Outer Barrier Reef, Danajon Bank were systematically investigated using two different methodologies: sediment suction and \emph{lumun-lumun} nets. Turrids morphospecies recovered from the experimental \emph{lumun-lumun} nets, which are a bundle of fine mesh fishing nets set at 15 m depth in the subtidal sandy sediments of outer barrier reef for two months during intermonsoon, southwest monsoon and northeast monsoon seasons were analyzed. The sediments suction method was also used to collect micro turrids in the sandy sediment substrata in the Outer Barrier Reef. Results of the analysis revealed that the turrids collected at 3m and 15m depth representing natural habitat sandy substrate had about $30\%$ morphospecies similar. The composition of turrids morphospecies collected from the natural habitat sandy substrate and in the \emph{lumun-lumun} nets were different with only one species shared by the two methods of collecting micromollusks probably due to nocturnal behavior of turrids which could have smaller chances of collecting during day time. However, \emph{lumun-lumun} nets are efficient in colonizing the free-swimming veliger and may serve as better sampler in collecting turrid recruits. The recovery of $80\%$ microturrids in the net proved that \emph{lumun-lumun} is efficient in recovering live tiny gastropods than the conventional sediment suctioning method; providing great opportunity for anatomical, morphological and molecular analysis. The very low overlap of turrid morphospecies obtained in the \emph{lumun-lumun} nets across monsoon periods implies that turrids are not self-seeding gastropod.

Keywords


Jacknife estimate, \emph{lumun-lumun} net, sediment suction, turrids

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Copyright (c) 2015 Romell A. Seronay, Porfirio M. Ali\~{n}o, Baldomero M. Olivera

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