Transitional and freshwater bioassessments: one site, two perspectives?
The freshwater-saltwater-transition-zone was analysed using two different sampling protocols and assessment methodologies, developed for freshwater and estuaries, to compare their agreement level in terms of community composition and quality assessments. The use of different protocols resulted in significant differences in macroinvertebrate communities, in index scores and initially in quality classes. After modifications in the sensitivity scores of the IBMWP and AMBI indices (average scores or the use of a score of the other index when both were present), the differences were largely reduced and quality classes became coincident for the assessments provided by IPtIs and BAT tools. Such harmonisation of quality assessments for adjacent water categories (e.g., large rivers vs. transitional waters), exemplified here as an harmonisation in one of the metrics comprised in the assessment tools, is essential as it has direct implications on the expansion and accomplishment of River Basin Management Plans committed by the Water Framework Directive.
IMAR - Institute of Marine Research, Marine and Environmental Research Centre, Faculty of Sciences and Technology, University of Coimbra, 3004-517 Coimbra, Portugal. Electronic address: jneto@ci.uc.pt.
J M
JM
Neto
IMAR - Institute of Marine Research, Marine and Environmental Research Centre, Faculty of Sciences and Technology, University of Coimbra, 3004-517 Coimbra, Portugal.
M J
MJ
Feio
IMAR - Institute of Marine Research, Marine and Environmental Research Centre, Faculty of Sciences and Technology, University of Coimbra, 3004-517 Coimbra, Portugal.
H
H
Teixeira
IMAR - Institute of Marine Research, Marine and Environmental Research Centre, Faculty of Sciences and Technology, University of Coimbra, 3004-517 Coimbra, Portugal.
J
J
Patrício
IMAR - Institute of Marine Research, Marine and Environmental Research Centre, Faculty of Sciences and Technology, University of Coimbra, 3004-517 Coimbra, Portugal.
S R Q
SR
Serra
CIIMAR, Rua dos Bragas 269, 4450-123 Porto, Portugal.
J N
JN
Franco
IMAR - Institute of Marine Research, Marine and Environmental Research Centre, Faculty of Sciences and Technology, University of Coimbra, 3004-517 Coimbra, Portugal.
A R
AR
Calapez
IMAR - Institute of Marine Research, Marine and Environmental Research Centre, Faculty of Sciences and Technology, University of Coimbra, 3004-517 Coimbra, Portugal.
E
E
Constantino
D044822:Biodiversity; D004784:Environmental Monitoring / Q000379:methods*; D063366:Estuaries; D005618:Fresh Water / Q000737:chemistry*; D011174:Portugal; D012623:Seawater / Q000737:chemistry*
Benthos; FSTZ; Oligohaline–freshwater zone; Pollution sensitivity; Quality status; WFD