Evolução de florestas amazônicas inundadas, de igapó - um exemplo do rio Tarumã-Mirim ()

Irion, Georg; Adis, Joachim

doi:10.1590/1809-43921979092299

Cited by 14 publications

(7 citation statements)

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“…Floodplain forests near large rivers in Central Amazonia are flooded to a depth of several metres for 5–7 months each year (March/April–August/September). This pattern has been maintained for at least 1 million years (Irion & Adis, 1979). The pronounced seasonal periodicity of the monomodal, rather predictable flood pulse (Fig.…”

Section: Faunal Composition and Survival Strategiesmentioning

confidence: 99%

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Terrestrial invertebrates inhabiting lowland river floodplains of Central Amazonia and Central Europe: a review

2002

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1. Amazonian terrestrial invertebrates produce high population densities during favourable periods and may suffer a drastic decrease during occasional floods and droughts. However, the monomodal, predictable flood pulse of the larger Amazonian rivers favours the development of morphological (respiratory organs, wing‐dimorphism), phenological (synchronization of life cycles, univoltine mode of life), physiological (flooding ability, gonad dormancy, alternating number of developmental stages), and behavioural adaptations (migration, temporal diving) with numerous interactions. 2. In lowlands of Central Europe, the flood pulse of large rivers is less predictable than in Central Amazonia and is superimposed by the seasonal light/temperature pulse (summer/winter regime). Some terrestrial invertebrates show physiological resistance against inundation or drought, phenologies fitting the normal annual rhythm of water level fluctuation (quiescence or diapause of eggs or adult invertebrates), high dispersal ability and migration. However, most species survive simply using a `risk strategy', combining high reproduction rates, dispersal and reimmigration following catastrophic events. 3. The diversity of species in terrestrial invertebrates is lower in lowland riverine ecosystems of Central Amazonia and Central Europe compared with the respective uplands because of flood stress in these systems. However, floodplains in Central Amazonia possess a greater number of endemic species in comparison with Central European floodplains because of long periods of fairly stable climatic conditions in comparison with large palaeoclimatic changes in Central Europe.

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Section: Faunal Composition and Survival Strategiesmentioning

confidence: 99%

“…Depending on the scale of observation, the annual flood pulse may act either as a deterministic agent, because it has occurred for millions of years (cf. Irion & Adis, 1979; Junk, 1997b; Adis, 2001), or as a stochastic agent, because its interannual variability favours different species from year to year (cf. Junk, 2000).…”

Section: Adaptationsmentioning

confidence: 99%

Terrestrial invertebrates inhabiting lowland river floodplains of Central Amazonia and Central Europe: a review

2002

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“…The Anaiigucocha record is not unique in suggesting that past hydrological disturbance was more pervasive than the contemporary regime. Extensive meandering and lateral erosion of river banks as well as regional flooding have been documented at sites across Amazonia during the late Quaternary (van der Hammen 1974, Irion and Adis 1979, Irion 1982, Campbell and Frailey 1984. However, many more studies are needed to reconstruct the Amazon's hydrological past in greater detail so that we might obtain an understanding of the role that hydrological dynamics played in the evolution of the Amazon's high species diversity.…”

Section: Lake Period (Zone 3 Since 800 Bp)mentioning

confidence: 99%

A Holocene Sedimentary Record from Anangucocha in the Ecuadorian Amazon

Frost¹

1988

Ecology

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The stratigraphic, seddimentary pigment, loss—on—ignition, pollen, and radiocarbon data of a sedimentary record from Anangucocha, in the Ecuadorian Amazon, define three environmental episodes during the last 3100 yr. A swamp episode (<3100—1300 BP) was followed by regional flooding (1300—800 BP) and an open lake period (since 800 BP). Pollen data show that a Mauritia palm forest occupied the early blackwater swamp and was replaced by a riparian community dominated by Cecropia during the flooding episode. The pollen of Urticaceae—Moraceae taxa, especially Urtica, has increased in abundance since the flood. Past flooding was an important disturbance agent, which influenced the history of the plant community around Anangucocha. In the Amazon forest, such episodic flooding may be an important type of disturbance that promotes and maintains high species diversity. The Anangucocha record indicates that Amazonia experienced climatic fluctuation during the late Holocene.

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“…Episodic flooding, such as we have documented in the Ecuadorian rain forest, has apparently affected some areas of the Amazon during the Holocene (Irion & Adis, 1979;Campbell & Frailey, 1984). Superimposed on this disturbance was the constant shifting of river courses in central (van der Hammen, 1974;Irion, 1982).…”

Section: Discussionmentioning

confidence: 91%

“…1975;Meade et al, 1985). Yet some evidence exists that the past was punctuated with episodic river migrations and regional flooding of even greater proportions than the contemporary regime (Irion & Adis, 1979: Irion. 1982Nittrouer.…”

Section: Introductionmentioning

confidence: 99%

Late Holocene flooding in the Ecuadorian rain forest

Frost

Miller

1987

Freshwater Biology

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SUMMARY 1. The stratigraphy, radiocarbon chronology, sedimentary pigment, and cation records of sediment cores from four lakes in the Ecuadorian rain forest show that regional flooding occurred from about 1300 to 800 ‘BP. Each core contains a stratum of alluvial clay, silt and sand overlain by lacustrine deposits of peat, gyttja or clayey gyttja. Radiocarbon dates show that the onset and termination of the alluvial event was synchronous across the sites. Short‐term, possibly regional, flooding occurred at each of the sites at least once since the major flood. 2. A core from Anangucocha, a black‐water lake, records the geoche‐ mical signature of white‐water incursion during this flooding interval. Sedimentary pigments show that aquatic production at Anañgucocha was low during the lotic interval but rose sharply and remained high within the modern lake period. 3. The Amazon's dynamic river system may have been an important force in promoting and maintaining high floral and faunal diversity.

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Evolução de florestas amazônicas inundadas, de igapó - um exemplo do rio Tarumã-Mirim ()

Abstract: ResumoEste trabalho tenta compreender o comportamento c!os artrópodos do solo da floresta de inundação do rio Tarumã-Mirim, perto de Manaus, Amazonas, em relação à evolução sedlmentológica durante o período quaternário. INTRODUÇÃO

Cited by 14 publications

References 1 publication

Terrestrial invertebrates inhabiting lowland river floodplains of Central Amazonia and Central Europe: a review

Terrestrial invertebrates inhabiting lowland river floodplains of Central Amazonia and Central Europe: a review

A Holocene Sedimentary Record from Anangucocha in the Ecuadorian Amazon

Late Holocene flooding in the Ecuadorian rain forest

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