aquaculture-summit-2017-posters-accepted-abstracts

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Volume 5, Issue 2 (Suppl)

J Fisheries Livest Prod

ISSN: 2332-2608 JFLP, an open access journal

Aquaculture Summit 2017

May 25-26, 2017

May 25-26, 2017 Osaka, Japan

Global Summit on

Aquaculture and Fisheries 2017

Distribution of cryptic species as a specific response to environmental effects at large scale: The freshwater

shrimp

Caridina indistinct

Calman, 1926 in the southeast Queensland

Amaal Gh Al-Saadi Yasser, Fran Sheldon and Jane M Hughes

Griffith University, Australia

ecent research suggests that morphologically cryptic species may differ notably in their ecological requirements and their

tolerance to environmental conditions. However, it is still unclear what effect environmental stress has on the relative abundance

of cryptic species, and whether broad differences among cryptic species in their distribution reflect differences in their tolerances to

various environmental variables, specifically water quality requirements. There is much genetic study showing that many of freshwater

species are harboring a number of cryptic species, which may occasionally occur in sympatry. In this study, we focused specifically

on freshwater shrimp belonging to the

Caridina indistincta

complex in southeast Qld. Two hypotheses have been suggested in this

study: 1) As the taxa have different distributions, their tolerance to water quality and elevation parameters also differ, 2) As the

different cryptic species of

Caridina indistincta

rarely exist sympatrically, their responses to environmental variables and preference

to the specific habitats will differ between species. Molecular work has been conducted for 147 shrimp specimens from 47 sites in

15 catchments across southeast Qld, by sequencing a fragment of the mitochondrial cytochrome c oxidase subunit I gene (

COI

The molecular approach identified three cryptic species of

Caridina indistincta

(Sp. A, B & D) and showed that these cryptic species

seldom exist together, with only three sites containing more than one species. Based on a multivariate analysis of water quality

variables at each site, Sp. A could be differentiated from Sp. B and Sp. D, but Sp. B and Sp. D overlapped substantially.

J Fisheries Livest Prod 2017, 5:2 (Suppl)