Diatom-based models for reconstructing past water quality and productivity in New Zealand lakes

Reid, Michael

doi:10.1007/s10933-004-0424-2

Cited by 77 publications

(42 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among the biological groups preserved in the sediments, diatoms have been widely used because of their taxonomic distinction, abundance, good preservation in sediments and their rapid response to environmental changes (Reid 2005, Bennion & Simpson 2011. The use of diatoms as indicators of environmental changes require high taxonomic precision (Birks 1994), since misidentifications can modify the interpretation in obtaining reliable data on modern diatom biodiversity (Buczkó & Magyari 2007, Wetzel & Ector 2014.…”

Section: Introductionmentioning

confidence: 99%

Composition and distribution of diatom assemblages from core and surface sediments of a water supply reservoir in Southeastern Brazil

et al. 2016

View full text Add to dashboard Cite

Composition and distribution of diatom assemblages from core and surface sediments of a water supply reservoir in Southeastern Brazil. Biota Neotropica. 16(2): e20150129. http://dx.doi.org/10.1590/1676-0611- BN-2015-0129 Abstract: Fresh water biodiversity is an increasing concern due to growing human impact. Herein, we report a long-term survey (ca. 90 years) of sedimentary diatoms and the modern flora from surface sediments and their biodiversity changes along a eutrophication gradient. Study was carried out in one of the most important water supply reservoirs (Guarapiranga Reservoir) of Sã o Paulo Metropolitan Region, Brazil. Results are based on 75 core subsamples (subfossil assemblages from core) previously dated by 210 Pb and 14 samples from surface sediments (modern assemblages). Overall, 84 taxa were reported, belonging to 30 genera, 71 species and eight non-typical varieties, besides five probable new taxa. Results expanded two new additions for the Brazilian diatom flora (Chamaepinnularia submuscicula and Stauroneis acidoclinata) and 30 infrageneric taxa for the state of Sã o Paulo. 47.6% of total taxa inventoried were accounted exclusively for the subfossil assemblages indicating a significant biodiversity change over time. Access to past oligotrophic conditions and to contemporary mesotrophic regions of the Guarapiranga Reservoir accounted for these new additions representing 25% of the total diatom flora. Decline in the total species number along the trophic state gradient occurred for subfossil and modern assemblages. This pattern was even clearer when considering the changes in species richness over time. Eunotia with 21 taxa was the far most represented genera particularly in the oligotrophic phase. During the transitional period , richness gradually declined. With the onset (in the 1970s) and the major eutrophication period (since ca. 1990) occurred a drastic reduction in richness and the replacement of oligotrophic to eutrophic species. Human management also caused abrupt changes in richness. Marked decline occurred (1933) assotiated with hydrological impacts (water discharge increase) with the initial use of the reservoir as a public water supply. Unlike, sudden increase occurred probably associated with the application of algaecide to control cyanobacterial blooms. Present findings highlight the need for surveying the diatom assemblages in protected environments or in less degraded conditions for biodiversity assessment. Furthermore, reinforce the use of paleolimnological approach as in many cases the only tool to assess biodiversity changes encompassing time scales relevant to human-induced degradation and pre-anthropogenic impacts. Keywords: Bacillariophyta, biodiversity change, eutrophication, Guarapiranga Reservoir, paleolimnology, species richness.FAUSTINO, S.B., FONTANA, L., BARTOZEK, E.C.R., BICUDO, C.E.M., BICUDO, D.C. Composic¸ão e distribuic¸ão das diatomáceas de perfil sedimentar e sedimentos superficiais em reservatório de abastecimento no Sudeste do Brasil. Biota Neotropica. 1...

show abstract

Section: Introductionmentioning

confidence: 99%

Composition and distribution of diatom assemblages from core and surface sediments of a water supply reservoir in Southeastern Brazil

et al. 2016

View full text Add to dashboard Cite

show abstract

“…For example, paleolimnological approaches are now routinely being used to study anthropogenic impacts on lakes in temperate regions (e.g., Cattaneo et al, 2004;Brooks et al, 2005;Miettinen et al, 2005;Vermillion et al, 2005), with the recent addition of some tropical studies (e.g., Cohen et al, 2005). Although a variety of paleolimnological indicators can be used, changes in diatom (Bacillariophyceae) species assemblages have been repeatedly identified as the most powerful indicators of water quality change associated with eutrophication (Hall and Smol, 1999), with many recent examples over broad geographic ranges (e.g., Wolin and Stoermer, 2005;Garrison and Fitzgerald, 2005;Reid, 2005).…”

Section: Introductionmentioning

confidence: 99%

Delayed response of diatom assemblages to sewage inputs in an Arctic lake

et al. 2007

View full text Add to dashboard Cite

Many Arctic communities use lakes as a cost effective method for facultative treatment and disposal of sewage and other liquid wastes. These sites represent ideal locations to study eutrophication processes in Arctic regions, where very little is known about accelerated nutrient fertilization, despite increasing threats from growing populations and long-range transport of eutrophying compounds. Here, we use paleolimnology, historical records, and nutrient modeling to assess the limnological response of Annak Lake (Belcher Islands, Nunavut, Arctic Canada) to a quarter century of persistent and increasing sewage inputs. Our reconstruction data indicate that the lake became hypereutrophic (>200 mg L -1 total phosphorus) shortly after sewage additions began in the late 1960s. Water chemistry data dating back to the early 1980s reflect the fertilizing influence of the wastewater discharge. Our fossil diatom assemblages show marked changes in the most recent sediments, changing from predominantly small, benthic Fragilaria sensu lato taxa to a more diverse benthic assemblage dominated by Navicula, Diadesmis, Fistulifera, and Nitzschia taxa. Interestingly, this species level response did not occur until the late 1980s, about two decades after initial sewage inputs. The incredible resilience displayed by the original, pre-impact Fragilaria sensu lato assemblage to 20 years of nutrient enrichment likely reflects the overriding influence of extended snow and ice coverage on diatom assemblages in Arctic regions.

show abstract

“…For the development of robust diatom-based inference models (Tibby 2004;Reid 2005) and for accurate ecological interpretations of the fossil record, the knowledge of the autecological characteristics of individual species is required. As population responses at the seasonal scale are strongly controlled by species-specific physiological integration of smaller-scale, higher frequency stimuli (Reynolds 1990), the study of seasonal dynamics of algal communities and their relation to the environment may be useful for obtaining information on individual ecological preferences of species.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Diatom Variability and Paleolimnological Inferences – A Case Study

Köster

Pienitz

2006

J Paleolimnol

View full text Add to dashboard Cite

The seasonality of physical, chemical, and biological water variables is a major characteristic of temperate, dimictic lakes. Yet, few investigations have considered the potential information that is encoded in seasonal dynamics with respect to the paleolimnological record. We used a one-year sequence of diatoms obtained from sediment traps and water samples, as well as the sedimentary diatom record covering the past ca. 1000 years in Bates Pond, Connecticut (USA), to investigate which variables influence the seasonal distribution of diatoms and how this can be used for the interpretation of the fossil record. The seasonal patterns in diatom assemblages were related to stratification and, to a lesser extent, to nitrate, silica, and phosphorus. During mixing periods in spring and autumn, both planktonic and benthic species were collected in the traps, while few lightly silicified, spindle-shaped planktonic diatoms dominated during thermal stratification in summer. Changes in fossil diatom assemblages reflected human activity in the watershed after European settlement and subsequent recovery in the 20th century. A long-term trend in diatom assemblage change initiated before European settlement was probably related to increased length of mixing periods during the Little Ice Age, indicated by the increase of taxa that presently grow during mixing periods and by application of a preliminary seasonal temperature model. We argue that the analysis of seasonal diatom dynamics in temperate lakes may provide important information for the refinement of paleolimnological interpretations. However, investigations of several lakes and years would be desirable in order to establish a more robust seasonal data set for the enhancement of paleolimnological interpretations.

show abstract

Diatom-based models for reconstructing past water quality and productivity in New Zealand lakes

Cited by 77 publications

References 55 publications

Composition and distribution of diatom assemblages from core and surface sediments of a water supply reservoir in Southeastern Brazil

Composition and distribution of diatom assemblages from core and surface sediments of a water supply reservoir in Southeastern Brazil

Delayed response of diatom assemblages to sewage inputs in an Arctic lake

Seasonal Diatom Variability and Paleolimnological Inferences – A Case Study

Contact Info

Product

Resources

About