title: In-situ effects of eutrophication and overfishing on physiology and bacterial diversity of the red sea coral Acropora hemprichii.
abstract: Coral reefs of the Central Red Sea display a high degree of endemism, and are increasingly threatened by anthropogenic effects due to intense local coastal development measures. Overfishing and eutrophication are among the most significant local pressures on these reefs, but there is no information available about their potential effects on the associated microbial community. Therefore, we compared holobiont physiology and 16S-based bacterial communities of tissue and mucus of the hard coral Acropora hemprichii after 1 and 16 weeks of in-situ inorganic nutrient enrichment (via fertilizer diffusion) and/or herbivore exclusion (via caging) in an offshore reef of the Central Red Sea. Simulated eutrophication and/or overfishing treatments did not affect coral physiology with respect to coral respiration rates, chlorophyll a content, zooxanthellae abundance, or δ (15)N isotopic signatures. The bacterial community of A. hemprichii was rich and uneven, and diversity increased over time in all treatments. While distinct bacterial species were identified as a consequence of eutrophication, overfishing, or both, two bacterial species that could be classified to the genus Endozoicomonas were consistently abundant and constituted two thirds of bacteria in the coral. Several nitrogen-fixing and denitrifying bacteria were found in the coral specimens that were exposed to experimentally increased nutrients. However, no particular bacterial species was consistently associated with the coral under a given treatment and the single effects of manipulated eutrophication and overfishing could not predict the combined effect. Our data underlines the importance of conducting field studies in a holobiont framework, taking both, physiological and molecular measures into account.
authors: Coral Reef Ecology Group (CORE), Leibniz Center for Tropical Marine Ecology (ZMT), Bremen, Germany.
authors: Christian
authors: C
authors: Jessen
authors: Javier Felipe
authors: JF
authors: Villa Lizcano
authors: Till
authors: T
authors: Bayer
authors: Cornelia
authors: C
authors: Roder
authors: Manuel
authors: M
authors: Aranda
authors: Christian
authors: C
authors: Wild
authors: Christian R
authors: CR
authors: Voolstra
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D037421:Anthozoa / Q000382:microbiology / Q000502:physiology*; D001419:Bacteria / Q000235:genetics; D044822:Biodiversity; D003247:Conservation of Natural Resources; D005068:Eutrophication; D005398:Fisheries; D020563:Gammaproteobacteria / Q000145:classification / Q000235:genetics*; D059014:High-Throughput Nucleotide Sequencing; D019156:Indian Ocean; D058889:Molecular Typing; D009586:Nitrogen Fixation; D010802:Phylogeny; D025341:Principal Component Analysis; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017423:Sequence Analysis, RNA
chemical_list: D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S
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