1
|
Nunez JCB, Rong S, Ferranti DA, Damian-Serrano A, Neil KB, Glenner H, Elyanow RG, Brown BRP, Alm Rosenblad M, Blomberg A, Johannesson K, Rand DM. From tides to nucleotides: Genomic signatures of adaptation to environmental heterogeneity in barnacles. Mol Ecol 2021; 30:6417-6433. [PMID: 33960035 PMCID: PMC9292448 DOI: 10.1111/mec.15949] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 04/28/2021] [Accepted: 04/30/2021] [Indexed: 12/25/2022]
Abstract
The northern acorn barnacle (Semibalanus balanoides) is a robust system to study the genetic basis of adaptations to highly heterogeneous environments. Adult barnacles may be exposed to highly dissimilar levels of thermal stress depending on where they settle in the intertidal (i.e., closer to the upper or lower tidal boundary). For instance, barnacles near the upper tidal limit experience episodic summer temperatures above recorded heat coma levels. This differential stress at the microhabitat level is also dependent on the aspect of sun exposure. In the present study, we used pool‐seq approaches to conduct a genome wide screen for loci responding to intertidal zonation across the North Atlantic basin (Maine, Rhode Island, and Norway). Our analysis discovered 382 genomic regions containing SNPs which are consistently zonated (i.e., SNPs whose frequencies vary depending on their position in the rocky intertidal) across all surveyed habitats. Notably, most zonated SNPs are young and private to the North Atlantic. These regions show high levels of genetic differentiation across ecologically extreme microhabitats concomitant with elevated levels of genetic variation and Tajima's D, suggesting the action of non‐neutral processes. Overall, these findings support the hypothesis that spatially heterogeneous selection is a general and repeatable feature for this species, and that natural selection can maintain functional genetic variation in heterogeneous environments.
Collapse
Affiliation(s)
- Joaquin C B Nunez
- Department of Ecology and Evolutionary Biology, Brown University, Providence, RI, USA
| | - Stephen Rong
- Department of Ecology and Evolutionary Biology, Brown University, Providence, RI, USA.,Center for Computational Molecular Biology, Brown University, Providence, RI, USA
| | - David A Ferranti
- Department of Ecology and Evolutionary Biology, Brown University, Providence, RI, USA
| | | | - Kimberly B Neil
- Department of Ecology and Evolutionary Biology, Brown University, Providence, RI, USA
| | - Henrik Glenner
- Department of Biological Sciences, University of Bergen, Bergen, Norway.,Center of Macroecology and Climate, GLOBE, University of Copenhagen, Copenhagen, Denmark
| | - Rebecca G Elyanow
- Department of Ecology and Evolutionary Biology, Brown University, Providence, RI, USA.,Center for Computational Molecular Biology, Brown University, Providence, RI, USA
| | - Bianca R P Brown
- Department of Ecology and Evolutionary Biology, Brown University, Providence, RI, USA
| | - Magnus Alm Rosenblad
- Department of Chemistry and Molecular Biology, University of Gothenburg, Lundberg Laboratory, Göteborg, Sweden
| | - Anders Blomberg
- Department of Chemistry and Molecular Biology, University of Gothenburg, Lundberg Laboratory, Göteborg, Sweden
| | - Kerstin Johannesson
- Department of Marine Sciences, University of Gothenburg, Tjärnö Marine Laboratory, Strömstad, Sweden
| | - David M Rand
- Department of Ecology and Evolutionary Biology, Brown University, Providence, RI, USA.,Center for Computational Molecular Biology, Brown University, Providence, RI, USA
| |
Collapse
|
4
|
Takeuchi Y, Hori M. Spatial density-dependent survival and development at different larval stages of the tiger beetle Cicindela japonica (Thunberg). POPUL ECOL 2007. [DOI: 10.1007/s10144-007-0047-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
6
|
Svensson CJ, Jenkins SR, Hawkins SJ, Aberg P. Population resistance to climate change: modelling the effects of low recruitment in open populations. Oecologia 2004; 142:117-26. [PMID: 15378344 DOI: 10.1007/s00442-004-1703-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2004] [Accepted: 08/03/2004] [Indexed: 10/26/2022]
Abstract
Isolated populations or those at the edge of their distribution are usually more sensitive to changes in the environment, such as climate change. For the barnacle Semibalanus balanoides (L.), one possible effect of climate change is that unpredictable spring weather could lead to the mismatching of larval release with spring phytoplankton bloom, hence reducing the recruitment. In this paper, model simulations of a variable open population with space limited recruitment were used to investigate the effects of low and zero recruitment on population abundance in S. balanoides. Data for model parameters was taken from an isolated population in the Isle of Man, British Isles. Model simulations with observed frequencies of years with low recruitment showed only small changes in population dynamics. Increased frequencies of low recruitment had large effects on the variation in population growth rate and free space and on population structure. Furthermore, populations with intermediate to high frequencies of low recruitment appeared more sensitive to additional changes in recruitment. Exchanging low recruitment with zero recruitment severely increased the risk of local extinctions. Simulations with consecutive years of low recruitment showed a substantial increase in free space and an increase in the time taken to recover to normal densities. In conclusion, model simulations indicate that variable populations can be well buffered to changes in the demography caused by introduced environmental noise, but also, that intermediate to high frequencies of disturbance can lead to a swift change in population dynamics, which in turn, may affect the dynamics of whole communities.
Collapse
Affiliation(s)
- Carl Johan Svensson
- Department of Marine Ecology, Göteborg University, Box 461, SE 405 30, Göteborg, Sweden.
| | | | | | | |
Collapse
|