Comparative metatranscriptomics reveals decline of a neustonic planktonic population

Nazia Mojib, Manjula Thimma, Kumaran Kuppusamy Mande, Rachid Sougrat, Xabier Irigoien

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The neuston layer in tropical seas provides a good model to study the effects of increased levels of different stressors (e.g., temperature, ultraviolet radiation and Trichodesmium blooms). Here, we use a comparative in situ metatranscriptomics approach to reveal the functional genomic composition of metabolically active neustonic mesozooplankton community in response to the summer conditions in the Red Sea. The neustonic population exhibited changes in composition and abundance with a significant decline in copepods and appendicularia in July, when Trichodesmium cells were more abundant along with high temperatures and UV-B radiation. Nearly 23,000 genes were differentially expressed at the community level when the metatranscriptomes of the neustonic zooplankton were compared in April, July, and October. On a wider Phylum level, the genes related to oxidative phosphorylation, carbon, nucleotides, amino acids, and lipids were significantly overrepresented in both arthropods and chordates in April and October. On organism level for copepods, expression of genes responsive to oxidative stress, defense against bacteria, immune response, and virus reproduction were increased along with the observed increased appearance of copepod carcasses in the samples collected during July. The differences in expression correspond either to secondary effects of the Trichodesmium bloom or more likely to the increased UV-B radiation in July. Given the dearth of information on the zooplankton gene expression in response to environmental stimuli, our study provides the first transcriptome landscape of the mesozooplankton community during a period of increased mortality of the copepod and appendicularia population.
Original languageEnglish (US)
Pages (from-to)299-310
Number of pages12
JournalLimnology and Oceanography
Volume62
Issue number1
DOIs
StatePublished - Oct 20 2016

Fingerprint Dive into the research topics of 'Comparative metatranscriptomics reveals decline of a neustonic planktonic population'. Together they form a unique fingerprint.

Cite this