Leaf litter input and electrical conductivity may change density of Phylloicus sp. (Trichoptera: Calamoceratidae) in a Brazilian savannah stream
Abstract Aim Shredders are generally not abundant in tropical streams, and there is considerable evidence suggesting that the food supply drives this pattern in headwaters. The aim of this study was to assess the effect of variation in the availability of food resources, over one year, on the densi...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Limnologia
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| Series: | Acta Limnologica Brasiliensia |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2016000100311&lng=en&tlng=en |
| _version_ | 1828304657927110656 |
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| author | Gustavo Figueiredo Marques Leite Fabíola Turiel Costa Silva Fernanda Keley Silva Pereira Navarro Renan de Souza Rezende José Francisco Gonçalves Júnior |
| author_facet | Gustavo Figueiredo Marques Leite Fabíola Turiel Costa Silva Fernanda Keley Silva Pereira Navarro Renan de Souza Rezende José Francisco Gonçalves Júnior |
| author_sort | Gustavo Figueiredo Marques Leite |
| collection | DOAJ |
| description | Abstract Aim Shredders are generally not abundant in tropical streams, and there is considerable evidence suggesting that the food supply drives this pattern in headwaters. The aim of this study was to assess the effect of variation in the availability of food resources, over one year, on the density of Phylloicus sp. (Trichoptera: Calamoceratidae), which is one of the main shredders in Neotropical headwaters. Methods We measured the relative importance of organic matter in terms of vertical input (VI) and benthic standing stock (BS) on Phylloicus sp. density from October 2012 to September 2013 in a preserved third order stream in the Cerrado savannah biome, Federal District, Brazil. Results Leaves were abundant (monthly biomass of 24.2 g.m–2 ±23.1 SD in VI and 46.1 g.m–2 ±76.7 SD in BS), increasing at the end of dry season (August to October) and comprised the most abundant fraction in VI and BS (~ 70%). Phylloicus sp. had a low density throughout the year (2.4 ind.m–2 ±4.9 SD) and its peak (13.7 ind.m–2 ±17.1 SD in October) was associated with greater leaf biomass in VI and high electrical conductivity in the stream. The well-defined peak of Phylloicus sp. density in October suggests interplay between the increase in Phylloicus density and the leaf litter that enters the stream at the end of the dry season. Electrical conductivity was also higher in October, reflecting an increase in nutrient concentrations in the water during this period. Conclusions The availability of leaf litter may be a determinant factor for the seasonal variation in Phylloicus sp. density in tropical streams, suggesting a bottom-up effect. Changes in the supply of allochthonous resources to the stream can lead to modification in populations of shredders, such as Phylloicus sp., and anthropogenic influences on the riparian vegetation can affect ecological processes of great importance to streams. |
| first_indexed | 2024-04-13T14:15:28Z |
| format | Article |
| id | doaj.art-85d3bcc4632b475695ded327e731f732 |
| institution | Directory Open Access Journal |
| issn | 2179-975X |
| language | English |
| last_indexed | 2024-04-13T14:15:28Z |
| publisher | Associação Brasileira de Limnologia |
| record_format | Article |
| series | Acta Limnologica Brasiliensia |
| spelling | doaj.art-85d3bcc4632b475695ded327e731f7322022-12-22T02:43:39ZengAssociação Brasileira de LimnologiaActa Limnologica Brasiliensia2179-975X28010.1590/S2179-975X1516S2179-975X2016000100311Leaf litter input and electrical conductivity may change density of Phylloicus sp. (Trichoptera: Calamoceratidae) in a Brazilian savannah streamGustavo Figueiredo Marques LeiteFabíola Turiel Costa SilvaFernanda Keley Silva Pereira NavarroRenan de Souza RezendeJosé Francisco Gonçalves JúniorAbstract Aim Shredders are generally not abundant in tropical streams, and there is considerable evidence suggesting that the food supply drives this pattern in headwaters. The aim of this study was to assess the effect of variation in the availability of food resources, over one year, on the density of Phylloicus sp. (Trichoptera: Calamoceratidae), which is one of the main shredders in Neotropical headwaters. Methods We measured the relative importance of organic matter in terms of vertical input (VI) and benthic standing stock (BS) on Phylloicus sp. density from October 2012 to September 2013 in a preserved third order stream in the Cerrado savannah biome, Federal District, Brazil. Results Leaves were abundant (monthly biomass of 24.2 g.m–2 ±23.1 SD in VI and 46.1 g.m–2 ±76.7 SD in BS), increasing at the end of dry season (August to October) and comprised the most abundant fraction in VI and BS (~ 70%). Phylloicus sp. had a low density throughout the year (2.4 ind.m–2 ±4.9 SD) and its peak (13.7 ind.m–2 ±17.1 SD in October) was associated with greater leaf biomass in VI and high electrical conductivity in the stream. The well-defined peak of Phylloicus sp. density in October suggests interplay between the increase in Phylloicus density and the leaf litter that enters the stream at the end of the dry season. Electrical conductivity was also higher in October, reflecting an increase in nutrient concentrations in the water during this period. Conclusions The availability of leaf litter may be a determinant factor for the seasonal variation in Phylloicus sp. density in tropical streams, suggesting a bottom-up effect. Changes in the supply of allochthonous resources to the stream can lead to modification in populations of shredders, such as Phylloicus sp., and anthropogenic influences on the riparian vegetation can affect ecological processes of great importance to streams.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2016000100311&lng=en&tlng=encaddisflyorganic matter dynamicstropical shreddersheadwatersCerrado |
| spellingShingle | Gustavo Figueiredo Marques Leite Fabíola Turiel Costa Silva Fernanda Keley Silva Pereira Navarro Renan de Souza Rezende José Francisco Gonçalves Júnior Leaf litter input and electrical conductivity may change density of Phylloicus sp. (Trichoptera: Calamoceratidae) in a Brazilian savannah stream Acta Limnologica Brasiliensia caddisfly organic matter dynamics tropical shredders headwaters Cerrado |
| title | Leaf litter input and electrical conductivity may change density of Phylloicus sp. (Trichoptera: Calamoceratidae) in a Brazilian savannah stream |
| title_full | Leaf litter input and electrical conductivity may change density of Phylloicus sp. (Trichoptera: Calamoceratidae) in a Brazilian savannah stream |
| title_fullStr | Leaf litter input and electrical conductivity may change density of Phylloicus sp. (Trichoptera: Calamoceratidae) in a Brazilian savannah stream |
| title_full_unstemmed | Leaf litter input and electrical conductivity may change density of Phylloicus sp. (Trichoptera: Calamoceratidae) in a Brazilian savannah stream |
| title_short | Leaf litter input and electrical conductivity may change density of Phylloicus sp. (Trichoptera: Calamoceratidae) in a Brazilian savannah stream |
| title_sort | leaf litter input and electrical conductivity may change density of phylloicus sp trichoptera calamoceratidae in a brazilian savannah stream |
| topic | caddisfly organic matter dynamics tropical shredders headwaters Cerrado |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2016000100311&lng=en&tlng=en |
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