COLONIZATION OF PERIPHYTIC ALGAE ON ARTIFICIAL SUBSTRATES IN A TROPICAL STREAM

1999 ◽  
Vol 14 (2) ◽  
pp. 307-322 ◽  
Author(s):  
Paul Kwan-sing Lam ◽  
Anping Lei
Keyword(s):  
Artificial Substrates ◽  
Tropical Stream ◽  
Periphytic Algae

scholarly journals Colonization of benthic invertebrates on artificial and natural substrate in a Neotropical lotic environment in Southern Brazil

2019 ◽  
Vol 41 ◽  
pp. e45872 ◽  
Author(s):  
Nilce Svarcz Jungles de Camargo ◽  
Atsler Luana Lehun ◽  
Jonathan Rosa ◽  
Ana Carolina de Deus Bueno-Krawczyk
Keyword(s):  
Benthic Invertebrates ◽  
Artificial Substrate ◽  
Artificial Substrates ◽  
Natural Substrate ◽  
Tropical Stream ◽  
Taxonomic Level ◽  
Lotic Environment ◽  
Significant Difference ◽  
Colonization Process ◽  
South Brazil

The objective of this research was to validate the colonization process on natural and artificial substrates by benthic invertebrates in a tropical stream in South Brazil. The samples were performed in July and August-2012, and 32 samplers were used, being 16 natural and 16 artificial substrates. In each sample, two replicas were taken for each substrate at the 2th, 4th, 7th, 14th, 21th 28th, 35th and 42th days of colonization. The organisms were identified to the lowest possible taxonomic level. In both substrates 3,070 benthic invertebrates were detected, of which 1,753 individuals were collected on the natural substrate, and 1,317 on the artificial substrate. From the identified taxa 8.5% were not dominant (Anacroneuria, Orthocladiinae, Tupiara, Smicridea, Baetodes, Tupiperla, Macrogynoplax, Gripopteryx, Cylloepus, Macrelmis, Microcylloepus, Hetaerina, Argia, Coryphaeschna, Atopsyche, Pomacea, Corydalus, Leptohyphes and Eccoptura), and 31.5% were dominant (Tanypodinae, Chironominae, and Paragripopteryx). The genus Simulium was very common, dominant and abundant, representing 65% of the collected individuals. No significant difference was found in the abundance and species composition between artificial and natural substrates. On the natural substrate, the higher colonization index was at the 35th day with 459 individuals, and the lowest was at the 14th day, with 87. On the artificial substrate the highest index was at the 42th day with 337 individuals, and the lowest was at the 4th day, with 85. Both natural and artificial substrates are efficient in characterizing the benthic community. In the evaluation of the ecological succession, it was not possible to observe a pattern that described the process, since the composition was nearly constant throughout the study period.

scholarly journals Grazing affects periphytic algal biomass in the periphyton-macrophyte relationship independently of the substrate type and nutrient status

2020 ◽  
Author(s):  
Monika Tarkowska-Kukuryk ◽  
Wojciech Pęczuła ◽  
Tomasz Mieczan
Keyword(s):  
Algal Biomass ◽  
Nutrient Status ◽  
Eutrophic Lake ◽  
Artificial Substrates ◽  
Algal Community ◽  
Ceratophyllum Demersum ◽  
Lake Ecosystems ◽  
Hypertrophic Lake ◽  
Periphytic Algae ◽  
Substratum Type

The macrophyte–algae relationship has primary importance in affecting the functioning of shallow lake ecosystems. However, how substratum type, grazing, and nutrient status affect the relationship, is still largely unknown. Here, we studied algal assemblages covering either the submerged macrophyte, Ceratophyllum demersum, or artificial plastic plants with similar morphological complexity to answer these questions. Nutrient status was assessed as eu- and hypertrophic conditions in two separate lakes. In contrast to previous studies, the algal community on artificial substrates resembled to those observed on C. demersum. Independently of nutrient status (lakes), algae colonised artificial substrates intensively, but the highest algal biomass was observed in the hypertrophic lake. The community of periphytic algae was represented by diatoms, chlorophytes, and cyanobacteria. In the eutrophic lake, rather diatoms were present with high relative abundance, whereas, in the hypertrophic lake, rather cyanobacteria prevailed. Grazing pressure was high in both lakes and in the case of both substrate types, affecting the biomass of periphytic algae significantly. Our results indicate that macroinvertebrate grazing plays a crucial role in affecting periphytic algal biomass, independently of nutrient status and substratum type in shallow lakes.

scholarly journals Saline mine-water alters the structure and function of prokaryote communities in shallow groundwater below a tropical stream

2021 ◽  
pp. 117318
Author(s):  
Lisa Chandler ◽  
Andrew J. Harford ◽  
Grant C. Hose ◽  
Chris L. Humphrey ◽  
Anthony Chariton ◽  
...  
Keyword(s):  
Mine Water ◽  
Shallow Groundwater ◽  
Structure And Function ◽  
Tropical Stream ◽  
And Function

scholarly journals Post-fire consequences for leaf breakdown in a tropical stream

2019 ◽  
Vol 31 ◽  
Author(s):  
Renan de Souza Rezende ◽  
Cristiano Queiroz de Albuquerque ◽  
Andrezza Sayuri Victoriano Hirota ◽  
Paulo Fernandes Roges Souza Silva ◽  
Ricardo Keichi Umetsu ◽  
...  
Keyword(s):  
Leaf Litter ◽  
Fungal Biomass ◽  
Mesh Size ◽  
Fire Effects ◽  
Dry Mass ◽  
Tropical Stream ◽  
Fire Event ◽  
Litter Bags ◽  
Fine Mesh ◽  
Post Fire Effects

Abstract Aim Wildfire is a natural pulsed disturbance in landscapes of the Savannah Biome. This study evaluates short-term post-fire effects on leaf litter breakdown, the invertebrate community and fungal biomass of litter from three different vegetal species in a tropical stream. Methods Senescent leaves of Inga laurina, Protium spruceanum and Rircheria grandis (2 ± 0.1 g dry mass) were individually placed in litter bags (30 × 30 cm: 10 mm coarse mesh and 0.5 mm fine mesh) and submerged in the study stream before and after fire. Replicate bags (n = 4; individually for each species, sampling time, fire event and mesh size) were then retrieved after 20 and 40 days and washed to separate the invertebrates before fire event and again immediately after fire. Disks were cut from leaves to determine ash-free dry mass, while the remaining material was oven-dried to determine dry mass. Results The pre-fire mean decomposition coefficient (k = -0.012 day-1) was intermediate compared to that reported for other savannah streams, but post-fire it was lower (k = -0.007 day-1), due to decreased allochthonous litter input and increased autochthones production. Intermediate k values for all qualities of litter post-fire may indicate that fire is equalizing litter quality in the stream ecosystem. The abundance of scrapers was found to be more important than fungal biomass or shredder abundance, probably due to their functioning in leaf fragmentation while consuming periphyton growing on leaf litter. Conclusions Theses results indicate that fire can modify the relationships within decomposer communities in tropical stream ecosystems.

Production and Analysis of High Resolution Polymer Replicas of Fibrillar Collagen

1999 ◽  
Vol 5 (S2) ◽  
pp. 398-399
Author(s):  
P. Sims ◽  
B. Todd ◽  
S. Eppell ◽  
T. Li ◽  
K. Park ◽  
...  
Keyword(s):  
Cellular Response ◽  
Physical Nature ◽  
Cell Types ◽  
Artificial Substrates ◽  
Adherent Cell ◽  
Fibrillar Collagen ◽  
New Materials ◽  
Substrate Interactions ◽  
Number Of Factors ◽  
Cell Substrate

Adherent cells generally construct the immediate substrate upon which they reside. This may occur via synthesis and secretion of new materials and/or by rearrangement and modification of existing substrate. The response of adherent cell types to an existing substrate can be influenced by a number of factors which include both the chemical and physical nature of the substrate. Cell adhesion, proliferation, differentiation and death can all be substrate dependent. Much effort has been directed toward chemical modification of substrates to regulate one or more of the parameters noted above. A significant, but somewhat smaller, degree of attention has been paid to the effects of the topography and microtopography on the cell response to substrate materials. Studies to date strongly suggest the topography is a significant factor in cell-substrate interactions. As noted above, it is most probable that both the chemistry and the structure of a substrate simultaneously influence the cellular response. However we wished to determine, particularly for artificial substrates, the role which microtopography can play in cell-substrate interactions.

Variables, Processes, and Rate-Expressions Describing Periphytic Algae-Based Biofilms: Development of the Algae Biofilm Model (ABM)

2009 ◽  
Vol 2009 (17) ◽  
pp. 415-429
Author(s):  
Rafael Vazquez-Burney ◽  
Joshua P. Boltz ◽  
Bruce R. Johnson ◽  
Glen T. Daigger ◽  
James Bays
Keyword(s):  
Periphytic Algae ◽  
Biofilm Model ◽  
Algae Biofilm
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