Regional and local environmental factors structuring undisturbed benthic macroinvertebrate communities in the Mondego River basin, Portugal

Chaves, Maria Manuela; Chainho, Paula; Costa, José Lino; Fornells, Narcís Prat; Costa, Maria João

doi:10.1127/0003-9136/2005/0163-0497

Cited by 30 publications

(40 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To use macroinvertebrates as ecological indicators, one necessary approach is to accumulate taxonomical and ecological information for establishing reference conditions. It is also important to determine how natural-induced factors control distribution patterns of macroinvertebrates, as high altitude river systems are usually strongly influenced by natural disturbances such as floods (Quinn and Hickey, 1990;Chaves et al, 2005), droughts (leading to a loss of hydrological connectivity) (Lake, 2003;Bonada et al, 2006), temperature (Maiolini and Lencioni, 2001), and the solubility of oxygen (Jacobsen et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Longitudinal patterns of macroinvertebrate communities in relation to environmental factors in a Tibetan-Plateau river system

Jiang

Xie

Chen

2013

Quaternary International

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Longitudinal patterns of macroinvertebrate communities in relation to environmental factors in a Tibetan-Plateau river system

Jiang

Xie

Chen

2013

Quaternary International

View full text Add to dashboard Cite

“…Those authors also stated that classification systems work even better when local factors (e.g., stream size, water depth, substrate composition) are used to classify sites. Chaves et al (2005) showed that some of the largescale variables included in the typology of Alves et al (2004) for the Mondego river might act as proxies, to some extent, for local-scale variables, as suggested by the hierarchical theory of river formation (Parsons et al, 2004). Water physicochemical factors such as conductivity and TDS are very different in the two hydrogeological regions found in this basin while altitude seems to reflect a sediment grain-size gradient (see Fig.…”

Section: Resemblance Of River Types and Macroinvertebrate Assemblagesmentioning

confidence: 99%

“…Macroinvertebrate communities of the selected sites were sampled during spring and summer 2002 and again in spring 2004, to account for seasonal variations related to hydrological changes (Chaves et al, 2005) and interannual variations related to the irregular precipitation regime (Feio et al, 2006). Some sites were completely dry during the summer campaign and were sampled only when water was present.…”

Section: Macroinvertebrate Samplingmentioning

confidence: 99%

“…Since catchment geomorphology and climate-related variables are often strong predictors of macroinvertebrate assemblages (Richards et al, 1996;Hawkins et al, 2000;Verdonschot and Nijboer, 2004;Chaves et al, 2005), sites within the same WFD type that were based on these factors are expected to represent relatively distinct ecological units for invertebrate communities (Verdonschot, 2006a;Sa´nchez-Montoya et al, 2007). Alternatively, in bottomup approaches, aquatic biological data are used to group similar stream sites (e.g., Wright et al, 1984;Parsons and Norris, 1996;Marchant et al, 1997;Ehlert et al, 2002;Heino et al, 2003;Lorenz et al, 2004;Dodkins et al, 2005;Sa´nchez-Montoya et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Are Water Framework Directive stream types biologically relevant? The case of the Mondego river, Portugal

Chaves

Costa

Chainho

et al. 2011

Ann. Limnol. - Int. J. Lim.

View full text Add to dashboard Cite

-Typology schemes are useful in partitioning natural spatial variability and thus helping implementing bioassessment methods. They have become widely accepted in Europe after the publication of the Water Framework Directive (WFD). The major objective of this study was to test if six Portuguese predefined physical stream-types (using System-B of the WFD) are concordant with macroinvertebrate assemblages collected in 31 undisturbed sites in a Portuguese river basin. A top-down (stream types defined by physical attributes) and a bottom-up approach (river classes defined by biological communities) were used. No significant differences were found in the mean number of taxa and abundance of different physical stream types and few taxa are characteristic of specific stream types. Discriminant analysis (DA) considering family-level composition revealed that all stream-types were significantly different and the cross-validation process showed that all stream-types had more than 50% of their samples correctly assigned. On the other hand, the bottom-up approach based on a correspondence analysis (CA) showed some overlap of the macroinvertebrate communities of pre-defined stream types, indicating that variations in the macroinvertebrate community structure was primarily related to altitude, mineralisation and a temporal gradient. DA crossvalidation and CA results suggest that tested stream types do not account for natural temporal changes known to affect macroinvertebrate communities in this Mediterranean basin and that the WFD typology should account for these natural variations. The exclusion of natural variability could indicate impairment when it does not exist or no impairment when it does exist (type I and II statistical errors).

show abstract

“…Spatially extensive fires predominantly occur in the mountainous northern half of the country where human modification of upland stream habitat is widespread (Chaves et al, 2005;Monaghan et al, 2008). The continental territory hosts a diverse assemblage of fish: 51 species are registered from freshwaters, 18 are Iberian endemics, five are unique to Portugal and 15 are introduced (Ribeiro et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

The impact of wildfire on stream fishes in an Atlantic-Mediterranean climate: evidence from an 18-year chronosequence

Monaghan

Machado

Wrona

et al. 2016

Knowl. Manag. Aquat. Ecosyst.

View full text Add to dashboard Cite

-The predicted increase in wildfires associated with climate change poses a risk to freshwater biodiversity that may be exacerbated by river regulation. We studied the effects of wildfire and river management on the fish assemblages of Atlantic-Mediterranean streams in northern Portugal. Employing a chronosquence survey covering an 18-year gradient of impact-recovery from major fire events (ca. 100% catchment burnt), we assessed the ecological response with respect to time since wildfire, interpreting fish assemblages in the context of species traits and characteristics of the river habitat. Non-burnt sites (N = 18; surveyed 4 years previously) were compared to burnt sites (N = 14), two of which were part of the non-burnt set, thus providing a Before-After Impact comparison (BAI; N = 2). Across burnt sites richness and abundance were not related to time since wildfire. BAI revealed a contrast in the response of different species that corresponded to descriptive evidence from the chronosequence of burnt sites. As resource specialists, Salmo trutta were negatively impacted by wildfire; Iberian endemic cyprinids, characterized by generalist traits, demonstrated resistance. Habitat structure was a key determinant of wildfire-impact, increasing with channel slope and the degree of channelization. The low abundance of migratory taxa (S. trutta and Anguilla anguilla) at burnt sites suggested the importance of fish mobility to post-fire recovery. These data demonstrate that trait profiles and habitat descriptions provide pragmatic information for the management of rivers in fire-susceptible regions and suggest that the rehabilitation of these upland stream habitats might enhance ecological resistance and resilience to catchment wildfire. Key-words:wildfire / fishes / species traits / Mediterranean streams / river habitat / conservation management Résumé -L'impact des incendies sur les poissons des cours d'eau en climat atlantique-méditerranéen : étude d'une chronoséquence de 18 ans. L'augmentation prévue des incendies associés au changement climatique pose un risque pour la biodiversité d'eau douce, qui peut être aggravé par la régulation de la rivière. Nous avons étudié les effets des feux et de la gestion de la rivière sur les peuplements de poissons de cours d'eau dans le nord du Portugal. Étudiant la chronoséquence d'un suivi couvrant une durée de 18 ans d'impact-récupération d'incendies majeurs (environ 100 % du bassin versant brûlé), nous avons évalué la réponse écologique temporelle à un incendie, en analysant les assemblages de poissons dans le contexte des traits d'espèces et des caractéristiques de l'habitat de la rivière. Les sites non brûlés (N = 18 ; suivis 4 ans auparavant) ont été comparés à des sites brûlés (N = 14), dont deux faisaient partie de l'ensemble non brûlé, offrant ainsi une comparaison avant-après l'impact (BAI ; N = 2). Parmi les sites brûlés la richesse et l'abondance ne sont pas liées au temps depuis l'incendie. BAI a révélé un contraste dans la réponse des différentes espèces qui...

show abstract

Regional and local environmental factors structuring undisturbed benthic macroinvertebrate communities in the Mondego River basin, Portugal

Cited by 30 publications

References 0 publications

Longitudinal patterns of macroinvertebrate communities in relation to environmental factors in a Tibetan-Plateau river system

Longitudinal patterns of macroinvertebrate communities in relation to environmental factors in a Tibetan-Plateau river system

Are Water Framework Directive stream types biologically relevant? The case of the Mondego river, Portugal

The impact of wildfire on stream fishes in an Atlantic-Mediterranean climate: evidence from an 18-year chronosequence

Contact Info

Product

Resources

About