Dynamics of allochthonous organic matter in a tropical Brazilian headstream

Júnior, José Francisco Gonçalves; França, Juliana; Callisto, Marcos

doi:10.1590/s1516-89132006000700014

Cited by 50 publications

(33 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Gessner et al, 1999). Such patterns are very characteristic, as much in tropical (Henry et al, 1994;Afonso et al, 2000;Gonçalves et al, 2006) as in temperate streams (e.g. Graça, 2001).…”

Section: Discussionmentioning

confidence: 97%

See 1 more Smart Citation

Input of litter in deforested and forested areas of a tropical headstream

Carvalho

Uieda

2010

Braz. J. Biol.

View full text Add to dashboard Cite

Riparian vegetation is the main source of leaves and the main energy source for low order streams. Therefore, changes in its composition affect the structure and processes in streams. We studied the contribution of the riparian vegetation by analysing the annual input of litter in deforested and forested areas of a tropical stream. The lateral, vertical (aerial) and horizontal (drift) litter inputs were analysed separately. The lateral input differed significantly between the two areas and included mostly fallen dry leaves. The vertical input, represented mainly by fallen dry leaves, occurred only in the forested area. The drift transport of litter was not significantly different between the deforested and forested areas and the input was composed mostly by CPOM. The removal of the native forest was clearly reflected in the low contribution of leaf litter in the deforested area.Keywords: annual input, Brazilian stream, detritus, riparian vegetation. Aporte de folhiço em áreas sem mata e com mata de galeria de um riacho tropical ResumoA vegetação ripária constitui um importante recurso energético em riachos de pequena ordem. Assim, mudanças em sua composição afetam a estrutura e os processos ecológicos em riachos. A contribuição da vegetação ripária foi analisada pela entrada anual de folhiço em duas áreas de um riacho tropical, uma cercada por mata de galeria e outra somente com vegetação arbustiva. A entrada lateral, vertical (aérea) e horizontal (drift) de material vegetal foi avaliada separadamente. A entrada lateral, composta principalmente de folhas secas, apresentou diferença significativa entre as duas áreas. A entrada vertical, também representada principalmente por folhas secas, ocorreu somente na área com mata de galeria. O transporte por drift não foi significativamente diferente entre as áreas, e a entrada foi composta principalmente de matéria orgânica particulada grossa. O efeito negativo da remoção da mata nativa foi bastante evidente pela baixa contribuição de folhas na área sem mata.Palavras-chave: aporte anual, detritos, riacho brasileiro, vegetação ripária.

show abstract

“…Gessner et al, 1999). Such patterns are very characteristic, as much in tropical (Henry et al, 1994;Afonso et al, 2000;Gonçalves et al, 2006) as in temperate streams (e.g. Graça, 2001).…”

Section: Discussionmentioning

confidence: 97%

“…Abelho and Graça, 1998). Litterfall in tropical forests may be either seasonal, especially when a marked dry season occurs, or non-synchronous, with litter entering at a relatively constant rate over the entire year (Abelho, 2001;Gonçalves et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

Input of litter in deforested and forested areas of a tropical headstream

Carvalho

Uieda

2010

Braz. J. Biol.

View full text Add to dashboard Cite

show abstract

“…In addition to the factors mentioned above, we cannot ignore that the samples were taken during the transition between the rainy and dry season and during the dry season. For headstreams, the dry season presents conditions that favor the occurrence of many cladoceran species, and certain ecological processes are involved for this, for example, (1) high input of leaves because of the senescence of the trees in gallery forests (Gonçalves et al 2006), increasing the possibility of colonization, (2) a large amount of light that reaches river beds, helping periphyton to develop and (3) slower flow. These processes provide favorable conditions for different species of cladocerans due to the availability of food contained in periphyton and reduced carrying of individuals, and thus higher stability of the substrates.…”

Section: Resultsmentioning

confidence: 99%

Cladocerans (Crustacea: Anomopoda and Ctenopoda) of the Sempre Vivas National Park, Espinhaço Range, Minas Gerais, Brazil

Sousa¹,

Elmoor-Loureiro²

2013

View full text Add to dashboard Cite

Protected areas are designed to maintain environmental conditions that favor the occurrence of a wide variety of taxa. However, few studies have devoted attention to inventories of biota in these areas. In this study, we provide a checklist of cladocerans for the poorly studied Sempre Vivas National Park, Minas Gerais state. Samples were collected in lotic and lentic environments, with a total of 27 species being recorded and the highest contribution coming from the Chydoridae family (21 spp.). Minas Gerais state is widely studied in relation to cladoceran fauna; nevertheless, the results indicate three new records. The genus Monospilus was reported for the first time in the Neotropical region.

show abstract

“…The stock of litter in streams can often reflect the organic matter input from adjacent vegetation (Bilby and Likens, 1980;Swanson et al, 1982), and exhibit similar patterns (Bambi et al, 2017). However, the presence and persistence of terrestrial material in the streambed is also related to several factors including composition, organization and densities of trees, seasonality and channel morphology (Fleituch, 2001;Gonçalves et al, 2006a;França et al, 2009;Tank et al, 2010;Flores et al, 2013;Lisboa et al, 2015;Bambi et al, 2017). Therefore, even with variation among sites in the degree of canopy cover and leaf input (Tab.…”

Section: Longitudinal Patterns In Shredders and Leavesmentioning

confidence: 99%

Relationships of shredders, leaf processing and organic matter along a canopy cover gradient in tropical streams

2017

View full text Add to dashboard Cite

Terrestrial allochthonous organic matter represents a structuring element and an important source of energy and carbon to fauna in small forested streams. However, the role of this matter as a food resource for benthic macroinvertebrates, and consequently, for shredders and their performance in riverine processes, is not clear in low-order tropical streams. Aiming to investigate the relationship between shredders and leaves, we analyzed along a gradient of 8-93% canopy cover biomass and abundance of shredders, accumulated leaves and breakdown rates of local leaves to verify if these parameters were related to shade conditions and to each other. Three hypotheses were tested: i) shredder biomass, accumulated leaves and breakdown rates are related to canopy cover and exhibit higher values in shaded sites; ii) shredder biomass is positively related to accumulated leaves and breakdown rates; and iii) due to the relatively large body size of the important shredders, the association of shredders with leaves and importance to leaf processing should be better expressed in terms of guild biomass than abundance. Shredder biomass varied between 846 and 1506 mg dry mass (DM) m -2 and accumulated leaves varied between 479 and 1120 g ash free dry mass (AFDM) m -2 across sites. Leaf breakdown rate (k), the only measured variable that varied significantly among sites, varied between -0.0015 and -0.0238 day -1 . Neither shredder biomass nor leaf biomass were associated with the shading gradient. On the other hand, shredder abundance and biomass, mainly represented by Triplectides (Trichoptera, Leptoceridae), was positively related to accumulated leaves within sites and to breakdown rates assessed by leaf packs. Leaf breakdown, as assessed by the experimental leaf packs, was associated with shredder biomass, but not with shredder abundance. This result suggests that macroinvertebrates are important for leaf detritus processing and that their biomass reflects their activity, presumably because it is related to their secondary production and perhaps non-consumptive action. Their activity was observed at the scale of leaf packs and not at the scale of variation in canopy cover because apparently canopy did not modulate availability of leaves, which were apparently not limiting to the shredders.

show abstract

Dynamics of allochthonous organic matter in a tropical Brazilian headstream

Abstract: ABSTRACT

Cited by 50 publications

References 23 publications

Input of litter in deforested and forested areas of a tropical headstream

Input of litter in deforested and forested areas of a tropical headstream

Cladocerans (Crustacea: Anomopoda and Ctenopoda) of the Sempre Vivas National Park, Espinhaço Range, Minas Gerais, Brazil

Relationships of shredders, leaf processing and organic matter along a canopy cover gradient in tropical streams

Contact Info

Product

Resources

About