GEO DataSets

(Submitter supplied) Populations that tolerate extreme environmental conditions with frequent fluctuations can give valuable insights into physiological limits and adaptation. In some estuarine and marine ecosystems, organisms must adapt to extreme and fluctuating salinities, but not much is known how varying salinities impact local adaptation across a wide geographic range. We used eight geographically and genetically divergent populations of the intertidal copepod Tigriopus californicus to test if northern populations have greater tolerance to low salinity stresses, as they experience greater precipitation and less evaporation. more...

Organism:

Tigriopus californicus

Type:

Expression profiling by high throughput sequencing

Platform:

GPL21784

12 Samples

Download data: FA, FASTA, XLSX

(Submitter supplied) This study aimed at measuring transcriptome-wide gene expression in four populations of the copepod T. californicus. Populations were exposed to two different thermal regime, a variable 20-28 degree and a constant 20 degree followed by a one-time stress at 28 degrees. RNA was extracted at 20 and 28 degrees for all populations from all thermal regimes. Transcriptome-wide gene expression was measured, and differentially expressed genes were determined for all populations for the different temperature combinations. more...

Organism:

Tigriopus californicus

Type:

Expression profiling by high throughput sequencing

Platforms:

GPL19353 GPL21784

32 Samples

Download data: FASTA, TXT

(Submitter supplied) The formation of new species is often a consequence of genetic incompatibilities accumulated between populations during allopatric divergence. When divergent taxa interbreed, these incompatibilities impact physiology and have a direct cost resulting in reduced hybrid fitness. Recent surveys of gene regulation in interspecific hybrids have revealed anomalous expression across large proportions of the genome, with 30-70% of all genes apparently misexpressed, mostly in the direction of down-regulation. more...

Organism:

Tigriopus californicus

Type:

Expression profiling by high throughput sequencing

Platforms:

GPL15675 GPL19353

9 Samples

Download data: TXT

(Submitter supplied) Background: Geographic variation in the thermal environment impacts a broad range of biochemical and physiological processes and can be a major selective force leading to local population adaptation. In the intertidal copepod Tigriopus californicus, populations along the coast of California show differences in thermal tolerance that are consistent with adaptation, i.e., southern populations withstand thermal stresses that are lethal to northern populations. more...

Organism:

Tigriopus californicus

Type:

Expression profiling by high throughput sequencing

Platform:

GPL15675

4 Samples

Download data: TXT