Dataset 774
Trinidad's Northern Range Freshwater Diatom Survey (2011-2015)
Realm: Freshwater
Climate: Tropical
Biome: Small river ecosystems Central latitude: 10.683120
Central longitude: -61.272670
Duration: 5 years, from 2011 to 2015
Climate: Tropical
Biome: Small river ecosystems Central latitude: 10.683120
Central longitude: -61.272670
Duration: 5 years, from 2011 to 2015
4386 records
26 distinct species
Across the time series Bacillariophyceae U is the most frequently occurring speciesMethods
"Sites in Trinidads Northern Range (SI Appendix) were sampled four times per year (twice in the wet season and twice in the dry season) for 5 y (20102015). On each sampling occasion the diversity of fish, benthic invertebrates, and diatoms at a site was quantified. Sampling methodology was consistent throughout. Eight of our sites were exposed to human pressure in the form of recreational use (31). These recreationally disturbed” (d) sites were matched with recreationally undisturbed” (u) sites in the same river system." "The same 50-m stretches of stream were revisited each session." Finally, in the case of diatoms three rocks of ~20cm diameter were collected from a depth of around 15 cm at intervals along the stream section, following the recommendations in (4). On return to the laboratory each sample was processed using the protocols in (4, 5). No taxonomic key is available for Trinidadian diatoms; specimens were therefore identified to morphospecies using a photographic catalogue compiled by AED (6). Diatom samples underwent a known dilution after which individuals were counted along 5 haphazard transects on a 1 ml Sedgewick-Rafter counting cell using an Olympus IX51 inverted light microscope (x60 N.A. 0.70 lens). Data from the diatom samples at a given site and session were combined for analysis.” [Extracted from Magurran et al., 2018 & Supplementary material] Additional: Abundance units are individual counts. Grain size is the length of the river reaches sampled. Data collected the first year of sampling (2010) are excluded because sampling effort was unequivalent with the rest of the time series. Two sampling repeatabilities carried out in the Acono and Maracas sites in 2011 are excluded.Citation(s)
.
In (Eds.),
(p. ).
:
.
,
(),
.
