Historical reconstruction of floodplain inundation in the Pantanal (Brazil) using neural networks

Fantin-Cruz, Ibraim; Pedrollo, Olavo Correa; Castro, Nilza Maria dos Reis; Girard, Pierre; Zeilhofer, Peter; Hamilton, Stephen K.

doi:10.1016/j.jhydrol.2011.01.014

Cited by 60 publications

(30 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, O. pequira also supports the LFR hypothesis, extending its reproductive activity with a decrease in river level, although with a smaller proportion of females reproducing, taking advantage of the elevation in rainfall and temperature, besides greater density of phytoplankton and zooplankton on which larvae can feed (documented in the northern Pantanal) (Loverde-Oliveira et al 2009;Fantin-Cruz et al 2011). Therefore, the results indicate an intermediate position between the applicability of the FPC and the LFR in O. pequira.…”

Section: Discussionsupporting

confidence: 58%

“…Shows variation in the intensity of rains, oscillating between 800 and 1,400 mm/year, where 80 % of rains occur from November to March (Fantin-Cruz et al 2011). This floodplain shows a unimodal flooding regime, which is essential to all the functions of the system (Junk et al 1989), since the high evapotranspiration does not allow local rainfall to contribute significantly to the fluviometric variations (Hamilton et al 1996).…”

Section: Study Areamentioning

confidence: 99%

See 1 more Smart Citation

Reproductive ecology of Odontostilbe pequira (Steindachner, 1882) (Characidae, Cheirodontinae) in the Paraguay River, southern Pantanal, Brazil

2013

View full text Add to dashboard Cite

The reproductive biology of Odontostilbe pequira was studied aiming to determining differences in population structure, reproductive tactics and correlating the reproductive period with rainfall, temperature and level of the Paraguay River, in the southern Pantanal, Brazil. Data were obtained for 623 individuals (366 females and 257 males), and of these, 253 females and 126 males were dissected for reproductive analysis. No significant variation was observed in the distribution of standard length and total weight between the sexes. The sex ratio was 1.42:1 (female: male), but the ratio did not differ over most months and between most length classes. The reproductive period was long (10 months). No correlation was found between the gonadosomatic index (GSI) of both sexes with water temperature and rainfall over the months analyzed. Males showed no significant association between the GSI and river level, but a marginally significant correlation was observed for females. Moreover, an effect of the mean historical river level on GSI was observed in both sexes, indicating that the flooding regime drive the reproductive activity, which proportions spawnings even when rainfall and temperature levels are low. Length at first maturity of the females was 24.2 mm and of the males 22.2 mm, with a significant difference between the sexes. The mean absolute fecundity was 181.4 oocytes/female, while mean relative fecundity was 0.544 oocytes/mg. Absolute fecundity was positively related to total weight, gonad weight and standard length. The mean diameter of the mature oocytes was 0.46 mm and the frequency distribution of the diameters showed various modes, indicating a multiple spawning. Thus, the reproductive tactics of O. pequira was characterized as "opportunistic strategist", with reproductive activity strongly associated with the flood pulse.

show abstract

Section: Discussionsupporting

confidence: 58%

Section: Study Areamentioning

confidence: 99%

Reproductive ecology of Odontostilbe pequira (Steindachner, 1882) (Characidae, Cheirodontinae) in the Paraguay River, southern Pantanal, Brazil

2013

View full text Add to dashboard Cite

show abstract

“…Another important aspect is that turbidity represented an environmental condition for development of larger filter feeders (Fantin-Cruz et al, 2011), corroborated by the presence and abundance of calanoid copepod in Bonita lake and its absence in Gansos lake. Calanoida is a planktonic group and inhabits open water surface (e.g.…”

Section: Factors That Structure the Beta Diversity Of Zooplankton Commentioning

confidence: 92%

“…In Brazil, some zooplankton studies have been done in lakes from Amazon in the northern region (Bozelli, 1992;Hardy, 1992), São Francisco river basin in the northeastern region (López & Sampaio, 2000), Pantanal in the central region (Fantin-Cruz et al, 2011) and Paraná river in the southern region (Lansac-Tôha et al, 2009). Thus, due to high environmental heterogeneity we could get a different composition and diversity in the zooplankton communities (Carvalho et al, 2001), along this gradient.…”

mentioning

confidence: 99%

Factors that drive zooplankton diversity in Neo-Tropical Savannah shallow lakes

Padovesi-Fonseca

Rezende

2017

Acta Limnol. Bras.

View full text Add to dashboard Cite

Abstract:Zooplankton is an important community in aquatic ecosystems due to its linkage between primary producers and secondary consumers also playing a key role in cycling of organic materials. Aim: Therefore, our objective was to evaluate the effects of physicochemical variables of the water on the diversity of zooplankton community in seven tropical shallow lakes of Brazilian savannah. Methods: Zooplankton samples were taken using a bucket and filtered 200 L by a 64 µm-mesh-plankton-net, and preserved for subsequent identification. Water temperature, dissolved oxygen, pH, electrical conductivity, turbidity, chlorophyll-a, ammonium, nitrate, nitrite, total phosphorus, and soluble reactive phosphorus were measured. Results: The turbidity (decreases the temperature, luminosity and the system productivity) and ammonium (increases the toxicity) values were the major factors responsible for structuring the zooplankton community. On the other hand, also nitrogen and phosphorus (increase the productivity) are limiting in savannah lentic systems for the zooplankton. The higher α diversity was positively associated with aquatic macrophytes (increase of niches and refuge), whereas lakes with geographic proximity increase the similarity in species composition, decreasing the β diversity. Conclusions: We conclude that the deterministic processes (niche theory), due to species have different ecological requirements, are different responses to environmental gradients and increase the diversity in heterogenic lentic systems.Keywords: α diversity; β diversity; nutrients; habitat heterogeneity; lentic systems.Resumo: O zooplâncton é uma comunidade importante nos ecossistemas aquáticos por ser o elo entre os produtores primários e os consumidores secundários, além de desempenharem um papel fundamental no ciclo de materiais orgânicos. Objetivo: Nosso objetivo foi avaliar os efeitos das variáveis físicas e químicas da água na diversidade de zooplâncton em sete lagoas rasas tropicais da savana brasileira. Métodos: As amostras de zooplâncton foram coletadas usando balde e filtrando 200 litros em rede de plâncton com abertura de 64 µm, e preservadas para posterior identificação. A temperatura da água, oxigênio dissolvido, pH, condutividade elétrica, turbidez, clorofila-a, amônio, nitrato, nitrito, fósforo total, fósforo reativo solúvel, cobertura de macrófita da lamina d'água foram obtidos. Resultados: A turbidez (ao diminui a temperatura, a luminosidade e a produtividade do sistema) e os valores de amônio (por aumenta a toxicidade) foram os principais fatores responsáveis pela estruturação do zooplâncton. Por outro lado, o nitrogênio e o fósforo (por aumentar a produtividade) são limitantes para o zooplâncton nos sistemas lênticos de savana. A maior diversidade α foi associada 2 Padovesi-Fonseca, C. and Rezende, R.S.

show abstract

“…The climate is warm and humid with rainy summers and dry winters, with a mean annual rainfall of around 1,100 mm. It is considered a floristic mosaic (Adámoli 1982), with various phytophysiognomies (Pott et al 2011) generated by the region's unique hydrology (Cunha & Junk 2009;Fantin-Cruz et al 2011).…”

Section: Study Areamentioning

confidence: 99%

Effects of flooding and its temporal variation on seedling recruitment from the soil seed bank of a Neotropical floodplain

2016

View full text Add to dashboard Cite

Evaluation of the eff ects of fl ooding on seedling recruitment from seed banks helps in understanding vegetation regeneration in fl oodplains. We studied the eff ects of simulated fl ooding on richness and abundance of, and temporal variation in, seedling recruitment from the soil seed bank of a fl oodable savanna of the Pantanal wetland, under two conditions: 1) Post-fl ood = inundated for 30 days followed by irrigation; 2) Non-fl ooded = only irrigated. We recorded emerged seedlings biweekly for 120 days and found a total of 124 species for the two treatments, the most abundant species were annual herbs (e.g., Richardia grandifl ora and Euploca procumbens) and annual graminoids (e.g., Digitaria ciliaris and Cyperus haspan). Flooding positively infl uenced seedling richness and abundance, while seedling emergence from the non-fl ooded soil was slower, but continued during all periods. Th e diff erent temporal patterns between treatments showed that fl ooding increases the abundance of emerged seedlings and acts as a trigger for explosive recruitment shortly after water depletion.

show abstract

Historical reconstruction of floodplain inundation in the Pantanal (Brazil) using neural networks

Cited by 60 publications

References 27 publications

Reproductive ecology of Odontostilbe pequira (Steindachner, 1882) (Characidae, Cheirodontinae) in the Paraguay River, southern Pantanal, Brazil

Reproductive ecology of Odontostilbe pequira (Steindachner, 1882) (Characidae, Cheirodontinae) in the Paraguay River, southern Pantanal, Brazil

Factors that drive zooplankton diversity in Neo-Tropical Savannah shallow lakes

Effects of flooding and its temporal variation on seedling recruitment from the soil seed bank of a Neotropical floodplain

Contact Info

Product

Resources

About