Evidence for the role of endosymbionts in regional-scale habitat partitioning by hydrothermal vent symbioses

被引:77
作者
Beinart, Roxanne A. [1 ]
Sanders, Jon G. [1 ]
Faure, Baptiste [2 ,3 ]
Sylva, Sean P. [4 ]
Lee, Raymond W. [5 ]
Becker, Erin L. [2 ]
Gartman, Amy [6 ]
Luther, George W., III [6 ]
Seewald, Jeffrey S. [4 ]
Fisher, Charles R. [2 ]
Girguis, Peter R. [1 ]
机构
[1] Harvard Univ, Dept Organism & Evolutionary Biol, Cambridge, MA 02138 USA
[2] Penn State Univ, Dept Biol, University Pk, PA 16802 USA
[3] Univ la Reunion, Inst Rech Dev, Lab Ecol Marine, St Denis 97715, Reunion, France
[4] Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA
[5] Washington State Univ, Sch Biol Sci, Pullman, WA 99164 USA
[6] Univ Delaware, Sch Marine Sci & Policy, Lewes, DE 19958 USA
基金
美国国家科学基金会;
关键词
chemoautotrophy; symbiosis; endosymbiosis; MUSSEL BATHYMODIOLUS-THERMOPHILUS; RIFTIA-PACHYPTILA JONES; LAU-SPREADING-CENTER; ROSE GARDEN VENT; HOST-PLANT USE; TUBE WORM; EPSILON-PROTEOBACTERIA; GENUS ALVINICONCHA; ISOTOPIC EVIDENCE; COMMUNITY;
D O I
10.1073/pnas.1202690109
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Deep-sea hydrothermal vents are populated by dense communities of animals that form symbiotic associations with chemolithoautotrophic bacteria. To date, our understanding of which factors govern the distribution of host/symbiont associations (or holobionts) in nature is limited, although host physiology often is invoked. In general, the role that symbionts play in habitat utilization by vent holobionts has not been thoroughly addressed. Here we present evidence for symbiont-influenced, regional-scale niche partitioning among symbiotic gastropods (genus Alviniconcha) in the Lau Basin. We extensively surveyed Alviniconcha holobionts from four vent fields using quantitative molecular approaches, coupled to characterization of high-temperature and diffuse vent-fluid composition using gastight samplers and in situ electrochemical analyses, respectively. Phylogenetic analyses exposed cryptic host and symbiont diversity, revealing three distinct host types and three different symbiont phylotypes (one epsilon-proteobacteria and two gamma-proteobacteria) that formed specific associations with one another. Strikingly, we observed that holobionts with epsilon-proteobacterial symbionts were dominant at the northern fields, whereas holobionts with gamma-proteobacterial symbionts were dominant in the southern fields. This pattern of distribution corresponds to differences in the vent geochemistry that result from deep subsurface geological and geothermal processes. We posit that the symbionts, likely through differences in chemolithoautotrophic metabolism, influence niche utilization among these holobionts. The data presented here represent evidence linking symbiont type to habitat partitioning among the chemosynthetic symbioses at hydrothermal vents and illustrate the coupling between subsurface geothermal processes and niche availability.
引用
收藏
页码:E3241 / E3250
页数:10
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