@article{fdi:010079090, title = {{B}iological index based on epiphytic diatom assemblages is more restrictive than the physicochemical index in water assessment on an {A}mazon floodplain, {B}razil}, author = {{L}obo, {M}.{T}.{M}.{P}.{S}. and {S}calize, {P}. {S}. and {K}raus, {C}. {N}. and da {S}ilva, {W}. {J}. and {G}arnier, {J}. and {M}arques, {D}. {D}. and {B}onnet, {M}arie-{P}aule and {N}ogueira, {I}. {D}.}, editor = {}, language = {{ENG}}, abstract = {{C}anadian {W}ater {Q}uality {I}ndex ({CWQI}) provides protection for freshwater life promoting healthy ecosystems and safeguarding human health. {B}iological {D}iatom {I}ndex ({BDI}) was developed to indicate the ecological status and water quality of freshwater systems. {T}his paper evaluates the relations between the two different indices. {D}uring rising and falling, water samples were taken in the {C}uruai {F}loodplain, {B}razil. {CWQI} was calculated using 14 physicochemical parameters and 1 microbiological parameter. {T}he limits were established according to freshwater quality conditions and standards based on water use classes 1 and 2 determined in {CONAMA} 357 legislation and {B}ritish {C}olumbia. {C}anadian {W}ater {Q}uality {I}ndex categorization ranged from "marginal" to "excellent," most sampling units were "good" (71%), followed by "fair" (12%) and "excellent" (12%) water quality. {T}otal phosphorus (38 times), chlorophyll a (20), dissolved oxygen (10), and total organic carbon (10) were the parameters that presented the most non-compliance values. {E}ncyonema silesiacum (14%), {G}omphonema parvulum (13%), and {N}avicula cryptotenella (12%) were the main taxa in the rising period, while {G}. lagenula, {E}. silesiacum, and {F}ragilaria capucina were the main taxa during the falling period. {BDI} ranges from {I} to {V} water quality classes. {W}e observed "poor" to "very good" ecological status, with most sampling units "moderate" (52%) and "good" (29%). {W}ater quality for class 2 was better than water quality for class 1, as the limits of the parameters evaluated were more restrictive in class 1 than in class 2 and the predominant uses of water require a higher degree of water purity. {T}he biological index based on diatoms was the most restrictive index whose water classes and categorizations have shown an ecological status that could threaten the protection of aquatic communities on the {C}uruai floodplain. {W}e suggest the combined use of both indices-physicochemical and biological for water quality assessment in this type of environment.}, keywords = {{C}anadian {C}ouncil of {M}inisters of the {E}nvironment {W}ater {Q}uality {I}ndex ; {W}ater classes ; {B}iological {D}iatom {I}ndex ; {E}cological status ; {W}ater ; {F}ramework {D}irective ; {BRESIL} ; {AMAZONE} {BASSIN}}, booktitle = {}, journal = {{E}nvironmental {S}cience and {P}ollution {R}esearch}, volume = {27}, numero = {10}, pages = {10642--10657}, ISSN = {0944-1344}, year = {2020}, DOI = {10.1007/s11356-020-07658-y}, URL = {https://www.documentation.ird.fr/hor/fdi:010079090}, }