Relationship of diatom diversity with the altitudinal gradient of the Bermejo River, Sucumbíos province, Ecuador
DOI:
https://doi.org/10.59410/PREPRINT-UEA-vBLGEL2324ep05-59Keywords:
Bacyllariophyceae, epilithic, epiphytic, abundance, richnessAbstract
The aim of this study was to relate diatom diversity to the altitudinal gradient of the Bermejo River. Sampling was carried out in september, october, and december 2022, at 20 points distributed over a 24.5 km stretch, with altitudes varying between 182 and 585 masl. Samples were collected by scraping rocks and macrophytes. Subsequently, the samples were treated in the laboratory with 30% hydrogen peroxide and then sealed with Naphrax® resin for microscopic observation. Thus, 10318 individuals corresponding to 313 species and 52 different genera were identified in the Bermejo River. Diversity was medium (H'= 2.43) to high (H'= 3.93) with low dominance (1-D > 0.67) and a homogeneous community (J'>0.59). The ANOSIM significance test did not show statistically significant relationships (p=0.098) between abundance and altitudinal gradient. This was confirmed by the Bray-Curtis index, which revealed similarities between stations in the low zone (ZB), with the highest similarity between P4-P1 (62 %) and the lowest between P8-P15 (42 %). Likewise, the ordination analysis using the non-metric multidimensional scaling technique (NMDS) showed that the abundance of species in the ZB (P17 and P19) are like those in the high zone (ZA). On the other hand, for the province of Sucumbíos there were 308 new diatom records. Finally, there was no relationship between diatom diversity and the altitudinal gradient, which suggests that the diversity of diatoms is not related to the altitudinal gradient.
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