Agrorural Ecosystem Effects on the Macroinvertebrate Assemblages of a Tropical River

Kohlmann, Bert; Arroyo, Alejandra; Springer, Mónika; Vásquez, Danny

doi:10.5772/59073

Cited by 8 publications

(17 citation statements)

References 37 publications

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“…A total of 368 samples were taken and sorted, with 66,182 individuals identified up to a family or genus level (Table 3). These individuals were classified into 16 orders, 50 families, and 77 genera, similar to other studies in Central American streams (Lorion & Kennedy, 2009;Kohlmann et al, 2015). Global composition was dominated by Diptera (72% of all individuals), mainly Chironomidae and Simuliidae, and, secondly, by Ephemeroptera (mainly Baetidae) (17%) (Fig.…”

Section: Resultssupporting

confidence: 71%

Responses of aquatic macroinvertebrates to human pressure in a tropical highland volcanic basin: Birrís River, Irazú Volcano (Costa Rica)

Marchamalo

Springer²,

Acosta

et al. 2018

Hidrobiológica

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Background. Tropical mountain rivers are strategic sources of water for human development while biological communities are indicators of the status of these ecosystems. However, volcanic basins close to large urban areas are affected by increasing human pressures that threaten the future of these ecosystems and their benefits to society. Goals. This paper analyzes the evolution of the responses of the aquatic macroinvertebrate assemblages in the face of increasing pressures in the Birrís River basin, which is essential for providing food and energy for the Greater Metropolitan Area of Costa Rica. The hypothesis that volcanic headwater communities are highly vulnerable to human impacts was tested. Methods. Composition and structure of aquatic macroinvertebrate assemblages were assessed along main river channels over two years. Results. The spatial variability of assemblages was related to organic pollution and the self-purification capacity of the river. Temporal variability was mainly explained by the intra-annual climate variability (seasonality). Macroinvertebrate assemblages were dominated by Chironomidae (Diptera), Simuliidae (Diptera), and Baetidae (Ephemeroptera) throughout the year. High flows during the rainy season (May to December) reduced density while diversity peaked at the end of that season. Ephemeroptera and Trichoptera reached their maximum abundance during the dry season, while Diptera showed maximum richness at the end of the rainy season. Conclusions. Biological communities showed spatial and temporal adaptations to the main environmental stresses, including high levels of organic pollution. However, the high slope of river channels favors the self-purification processes, which offer an opportunity for the recovery of ecological integrity combined with control of the organic discharges. More information is needed on taxonomy and autoecology of aquatic fauna and flora in these fragile volcanic environments that are strategic for the protection of water resources in the tropics.

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Section: Resultssupporting

confidence: 71%

Responses of aquatic macroinvertebrates to human pressure in a tropical highland volcanic basin: Birrís River, Irazú Volcano (Costa Rica)

Marchamalo

Springer²,

Acosta

et al. 2018

Hidrobiológica

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“…The distribution of the genus was reconstructed based on our data and published information (Sharp 1882;Spangler & Santiago 1991;Spangler & Santiago-Fragoso 1992;Amanzo et al 2003;García Obando 2003;Sites et al 2003;Álvarez et al 2011;Guevara Mora 2011;Llano-Castillo 2012;Maier 2013;Salcedo et al 2013;Tapia Castillo & Vega 2014;Kohlmann et al 2015;Shepard & Chaboo 2015;González-Córdoba et al 2016;Reymundo & Araujo 2016;Rodríguez et al 2016;Shepard pers. com.).…”

Section: Discussionmentioning

confidence: 98%

A revision of Onychelmis Hinton, 1941 (Coleoptera: Elmidae), with description of new species, DNA barcoding and notes on the geography of the genus

Linský

Čiamporová‐Zaťovičová

Cĭampor

2021

EJT

1,146

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The genus Onychelmis Hinton, 1941 was for a long time regarded as a small taxon with only three known species distributed in the Andes. A study of new material from Ecuador, using morphological and molecular data, has resulted in the discovery of five new species: Onychelmis lenkae sp. nov., O. lobata sp. nov., O. minor sp. nov., O. onorei sp. nov. and O. splendida sp. nov. We also revised the entire genus and redescribed the three known species, O. longicollis (Sharp, 1882), O. leleupi Delève, 1968 and O. whiteheadi Spangler & Santiago, 1991. Habitus photographs of adults are provided, together with line drawings of male and female genitalia, and schematic illustrations of the distribution of femoral tomentum for each species. DNA sequences for barcoding the COI mtDNA fragment were used to support species delimitation and to suggest possible relationships among species. The revision includes a key to adults of all species of Onychelmis and notes on the biogeography of the genus, with an updated distribution map.

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“…The understanding of FFG in relation to LULC changes is an important approach for (Montoya et al, 2015;Merritt et al, 2017). Several studies compared the proportion of FFGs in streams (Couceiro et al, 2011;Kohlmann et al, 2015) and some refer to the decrease of shredders at agriculture streams rather than forested ones (Death et al, 2009;Sonoda et al, 2009;Astudillo et al, 2016). Some explanations are found at the literature to explain the impact of agriculture land-use and land-cover on the aquatic system, such as imbalance of chironomids abundance relative to an increase in the number of agricultural streams (Sonoda et al, 2011;Corbi et al, 2013;Suriano and Fonseca-Gessner, 2013) and sediment addition (Matthaei et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Chironomidae from Eastern Amazon: Understanding the differences of land-use on functional feeding groups

et al. 2018

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Deforestation for agricultural purposes is the most dangerous human action against the conservation of the Brazilian Amazon Forest; its rates reached almost 20% of the original forested area. Many studies have been conducted on Chironomidae systematics and ecology over the Amazon biome, but most concerned the Central Amazon, while little is known about Chironomidae diversity and the effects of land development and agriculture intensification on the aquatic biota from Eastern Brazilian Amazon. The present study analyzed the effects of different land-use and land-cover on Chironomidae assemblages. Land-Use and Land-Cover (LULC) at the riparian zone were assessed from satellite imagery and three categories were defined: Forest, Secondary (Capoeira) and Agriculture. Ten catchments were selected: two for Forest, five for Agriculture and three for Secondary. For each catchment we characterized habitat and sampled insects. We hypothesized that i) the assemblage taxonomic richness will change across different land uses on riparian zones and ii) feeding functionality is a better information than taxonomic resolution to show the importance of LULC upon stream. A total of 20,884 individuals were sampled from the streams, abundance was higher in Agriculture streams. Corynoneura (18.4%), Pentaneura (14.6%) and Rheotanytarus (14.0%) were the most abundant genera in Agriculture streams; Corynoneura (17.8%), Caladomyia (13.6%), Paratanytarsus (13.1%) and Beardius (10.9%) dominated Forest streams; Goeldichironomus (25.9%), Rheotanytarus (17.6%) and Polypedilum (13.2%) dominated Capoeira streams. Regarding FFG, gatherers were the most numeric abundant in Forest (50.3%), followed by filterers (38.7%), predators (6.6%) and shredders (4.2%). In Capoeira, filterers were the main FFG (61.1%), gatherers (27.9%), predators (7.7%) and shredders (3.3%). In Agriculture streams, predators, filterers and gatherers had close numeric participation, 34.9%, 32.4% and 32.2%, respectively. Shredders performed a smaller fraction (0.4%). In Forest and Agriculture, scrapers participation was under 0.2%, while it was absent at Capoeira. Permutation tests showed significant differences among assemblages, based on numerical abundance of genera and on functional feeding group data. Even though, shredders showed a discrete participation in all three LULC, it was statistically significant higher at Forest streams when compared to Agriculture ones. Our study was able to demonstrate taxonomic differences of all LULC analyzed and it also showed the importance in considering the feeding behavior to understand the effects of land-use and land-covers changes.

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Agrorural Ecosystem Effects on the Macroinvertebrate Assemblages of a Tropical River

Cited by 8 publications

References 37 publications

Responses of aquatic macroinvertebrates to human pressure in a tropical highland volcanic basin: Birrís River, Irazú Volcano (Costa Rica)

Responses of aquatic macroinvertebrates to human pressure in a tropical highland volcanic basin: Birrís River, Irazú Volcano (Costa Rica)

A revision of Onychelmis Hinton, 1941 (Coleoptera: Elmidae), with description of new species, DNA barcoding and notes on the geography of the genus

Chironomidae from Eastern Amazon: Understanding the differences of land-use on functional feeding groups

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