River Edge Research Articles

Effects of alligator weed invasion on wetlands in protected areas: A case study of Lishui Jiulong National Wetland Park

Wetlands are one of the ecosystems most easily and severely invaded by alien species. Biological invasions can have significant impacts on local plant communities and ecosystem functioning. While numerous studies have assessed the impacts of biological invasions on wetlands, relatively few have been conducted in protected areas such as national wetland parks. We conducted a field survey to investigate the effects of the invasive herb Alternanthera philoxeroides (alligator weed) on the productivity and structure of plant communities and soil microbial communities in the Lishui Jiulong National Wetland Park in Zhejiang, China. We also examined the potential influence of the distance to the river edge on the impact of the alligator weed invasion. The alligator weed invasion significantly altered the plant community structure. It reduced the coverage of co-occurring plant species, including native (−31.2 %), invasive (−70.1 %), and non-invasive alien plants (−58.4 %). However, it increased species richness by 50 %, Pielou's evenness by 20 %, and Simpson's diversity index by 29.1 % for the overall plant community. Furthermore, within the community not invaded by alligator weed, increasing the distance to the river edge decreased the number of native plants by 57.0 % and the aboveground biomass of other invasive plants by 78.6 %. Contrary to expectations, no effects of the alligator weed invasion were observed on soil fungal and bacterial communities. Therefore, the impacts of the alligator weed invasion varied with spatial context and plant category, emphasizing the need to consider multiple scales and environmental factors when assessing the effects of invasive species on plant biodiversity. These insights enhance our understanding of plant invasions in wetlands and can guide the development of effective management strategies for these important ecosystems.

An event-related potential investigation of the influence of bilingualism on disambiguating homonyms in older adults.

Ambiguity is ubiquitous in language; lexical ambiguity refers to instances where a single word has multiple meanings. The current investigation examined homonyms, words that have the same orthography and pronunciation in English but multiple meanings (e.g., BANK, meaning "financial institution" or "river's edge"). The processing of homonyms requires the engagement of executive control processes, for example, to select the appropriate meaning of the homonym while reducing interference from other meanings. Executive function processes are known to change over the lifespan and may be impacted by experiential factors such as bilingualism. The present study uses event-related brain potentials as an index of lexical access to examine whether bilingualism influences homonym processing in older adults. The results indicate that patterns of lexical access differ as a function of bilingual status in older adults and compared to young adults, suggesting that language experience may moderate language processing in both young and older adults, at least in situations where language processing is demanding on executive function, such as in the processing of homonyms. Importantly, we show that older bilinguals show a somewhat similar pattern of ambiguity processing as their younger counterparts, while age differences were observed in monolinguals when comparing across studies. This suggests that bilingual language experience may have a mitigating impact on age-related changes in ambiguity processing. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Plastic litter assessment of the riverbanks of Pulot River and its tributary in Sofronio Española, Palawan Island, Philippines

Rivers are essential sources of plastic litter in the marine environment. Recently, the Philippines was reported as the biggest polluter of plastic litter from riverine sources. However, the riverine plastic litter's origin has been less established. In this study, we determined the density, composition, and accumulation of plastic litter on the riversides of Pulot River and its tributary in Palawan Island, Philippines. We also identified the possible sources of plastic litter. Results showed that the plastic litter density was highest at the river edge during the first sampling period. Litter densities for the predefined zones and sampling periods all showed no significant differences. The most dominant plastic litter types were food packaging and plastic bags, followed by toiletries. ‘Others’ consisted of multilayers, mixed, and plastics accounted for the most abundant polymer types. We identified the residents in the vicinity illegally dumping litter, for there were small illegal dumping sites along the river. These results suggest the urgent need for better waste policy implementation measures to protect the riparian environments and reduce the input of riverine plastic litter into the marine environment to ensure river resource sustainability.

Abundance of five sympatric stream dwelling mussels varies with physical habitat

Abstract Freshwater mussel species regularly co‐occur in streams forming assemblages, but the extent of shared versus unique instream habitat features that contribute to their distribution and abundance is poorly understood. In Massachusetts, a rare species, Alasmidonta varicosa, is often found with four other species: Alasmidonta undulata, Strophitus undulatus, Margaritifera margaritifera, and Elliptio complanata, yet variation in species composition within assemblages raises questions of potential species‐specific habitat associations. Identifying species‐level habitat information is critical at a spatial scale that malacologists can use to identify translocation or restoration areas. This study investigated whether species abundance varied by mesohabitat type (riffle, run, dam pool, scour pool), instream habitat characteristics, and within‐reach location (centre versus edge). From 2016 to 2019, freshwater mussel surveys were conducted in nine streams across Massachusetts and associated habitat information was collected. Species abundances were similar across mesohabitat types. Elliptio complanata was the exception, whereby higher abundances occurred in runs and dammed pools than in riffles. Unique species relationships with habitat existed for M. margaritifera with macroalgae and emergent vegetation, and A. varicosa with heterogeneous substrate. Flow transitions, such as depositional areas that create heterogeneous substrates, may provide habitats for A. varicosa. Most mussel species were distributed with higher abundance in the river centre than the edge; E. complanata was the only species with a higher abundance at the river edge. Locations with high abundance varied based on unique relationships with pebble heterogeneity (A. varicosa), depth (A. undulata), large wood (A. undulata), and canopy closure (E. complanata). Including physical characteristics in a holistic assessment of habitat that incorporates fish and landscape attributes may further an understanding of river reaches that best support translocated and propagated freshwater mussels.

Human–river interaction and perceived morbidities: A cross-sectional study on River Killi, Kerala

Abstract INTRODUCTION: Almost all water resources around the world have been polluted by human activities. River pollution from industries and agricultural/domestic areas is ultimately affecting human life. It is important to understand such a problem from a public health angle as well as from the perspective of the river bank population. OBJECTIVE: The study examines the public health dimensions of human-river interaction in relation to the riverbank population and to assess their morbidity profile with respect to river Killi in Trivandrum district, Kerala. METHODOLOGY: The full stretch of the river was divided into grids for every 3 kms. and houses from alternate grids within 50 meters from the river edge were selected for the study. Data collection among 302 riverbank residents was done based on a pre-tested, semi-structured interview schedule in addition to in-depth interviews among 15 stakeholders. RESULTS: The study results showed that 161 (53.3%) households belonged to the Below Poverty Line (BPL) and 169 (56%) respondents were from low socioeconomic status. The human-river interaction was significantly associated with the place of residence (rural/urban) and their economic status. Common self-reported morbidities include itching on the skin (16.2%) and fungal infections (12.9%). The riverbank population also stated their vulnerability to flooding during the rainy season and the unavailability of fresh water during dry summer. The cleaning program by the government had a positive impact on river cleanliness. However, in many places along the stretch of the river, sewage drainage, waste dumping and aquatic weeds are still a problem. CONCLUSION: This study shows several factors that disturbed the positive human-river interaction. A collaborative approach including stakeholders and the riverbank population for better river management and persistent surveillance on river water quality and health evaluation of the riverbank population are needed.

Redox trapping of arsenic in hyporheic zones modified by silicate weathering beneath floodplains

Groundwater containing high concentrations of dissolved arsenic (As) and iron (Fe(II)) discharges to rivers across the Ganges-Brahmaputra-Meghna delta. Observed Fe(III)-oxyhydroxide (FeOOH)–As deposits lining the riverbanks of the Meghna River may have been created by bidirectional mixing in the hyporheic zone (HZ) from ocean tides. This process has been named the Natural Reactive Barrier (NRB). Sedimentary organic carbon (SOC) is deposited annually on floodplains. Floodwaters that infiltrate through this layer may chemically transform the groundwater prior to discharging through the HZ in ways that influence the capture and retention of As in the NRB. The goal of this study is to understand how the interaction of these two scales of river-groundwater mixing influence the fate of As trapped within an NRB. Monitoring wells were installed to 1–17 m depth, up to 100 m distance from the river's edge during the dry season on the East (Site 1) and West (Site 2) sides of the river. They were sampled during the dry season (January) under gaining river conditions. The physical properties and elemental composition of the sediment was described by hand observation and hand-held X-Ray Fluorescence (XRF), respectively. Mixing with river water was quantified using the sum of charge of major cations (TC). Site 1 has a sloping bank that is only partially inundated during the wet season. The aquifer is composed of homogeneous sand. Site 2 is flat and therefore fully inundated in the wet season. The aquifer is composed of sand with thin (1–20 cm thick) clay layers. Both sites generate the dissolved products of FeOOH-reduction coupled to organic carbon oxidation, and silicate weathering beneath the floodplain. These products are dissolved Fe, As, silica, bicarbonate, calcium and phosphate. This chemistry is conducive to the formation of crystalline iron oxide minerals such as goethite which may co-precipitate with As, trapping it long-term.

The colour temperature and placement of LED lighting near rivers can reduce attraction of flying adult caddisflies

Abstract Artificial light at night (ALAN), which can confuse and distract insects, has been implicated as a contributor of their decline worldwide. Changes in artificial light technology has led to a widespread conversion of outdoor lighting to light‐emitting diode (LED) bulbs, which are more energy efficient than older high‐intensity discharge or fluorescent lamps. However, many outdoor LED lights emit a proportion of short‐wavelength blue light, to which insects are commonly sensitive. The potential to reduce flying insect attraction to outdoor lights by using LEDs that emit different amounts of blue light, or by placing lights further from insect sources has not been well‐studied, particularly for freshwater insects. We tested whether four blue‐white LEDs that varied in their emittance of blue light intensity (3000, 4000, 5650, 6500 Kelvin [K] colour temperature) differed in their attractiveness to flying insects, particularly adult caddisflies (Trichoptera) over distances up to 100 m from a river. LEDs were deployed at a lit urban river and a predominantly unimpacted braided river in Canterbury, New Zealand. We expected a greater abundance and species richness of adult caddisflies to be attracted to LEDs that emit more blue light (cooler white LEDs [6500, 5650 K]) than those that emit less (warmer colour temperatures [3000 K, 4000 K]). We also expected the abundance and species richness of adult caddisflies in light traps to decline rapidly with increasing distance from the river, regardless of colour temperature. Moths, flies and a total of 26 caddisfly species were collected from both rivers. Significantly more caddisflies were attracted to higher than lower colour temperature LEDs. For example, a more than 1.6‐fold number of caddisflies were caught by the bluer‐white 6500 K LEDs than the warmer‐white 3000 K LEDs. This trend was consistent across most caddisfly taxa and both rivers. The number of caddisflies attracted to LEDs significantly declined with increasing distance from the river edge for the two most abundant caddisfly families and the four most abundant species; 65% of all caddisflies were caught by 20 m from the river margin. In order to reduce the attraction of caddisflies to outdoor lights such as streetlights, our study highlights the importance of considering a low LED colour temperature (3000 K or 4000 K) or those that emit less blue light and the benefit of positioning lights further back from waterways, where possible. Our results indicate that plans for urban outdoor lighting should consider the ecological implications of different colour temperature LEDs and their spatial position as project design considerations.

The Identification of House Characteristic in the Karang Mumus River Bank Settlement Samarinda City Based on Settlement Development Patterns

An Living in the river region has certain characteristics and uniqueness, as the body of a house is familiar with the situation and area of the bengals. The island of Kalimantan is divided by bengals-large, characteristic and characteristic areas and other areas, one of which is the sharpening child of the master river that divides the city of Samarinda. The typology of the house of the Karang Mumus river comprises three types of structures that were built on the river's edge or commonly called floating houses, and those on the waterfront or transitional zone between the water and the land commonly called stilts, and the buildings on the ground. The research method used by the writer is the qualitative descriptive method of identifying house typology above the river Karang Mumus to evaluate whether it measures up to the standards associated with the settlements above the river. The purpose of this article was to find typology of the buildings at the settlement of the Karang Mumus river situated on the flotation segment, stage, and concrete. In addition to the configuration of forms and Spaces, it is acquired a developmental pattern that can have an impact on the characteristics of the settlement

Place Identity in Defining Urban Space of Border Rivers in Historical City Centres

In the city, building space could transform to be as place, because architecture does not include only traditional values such as housing, human protection, stability, etc, but could carry other dimensions beyond the housing or building occupancy or develop urban design. Rivers had vision in motion as a way to show dynamic processes in its flowing slowly, which are simply measured in time and the life of citizens. The research consider the river path in traditional cities as Alley connecting the spaces of the city ... old Baghdad was characterized by this property and it is look like Venice in the past, while traditional European cities were able to preserve this property till now, and capable to take transformation of the city with development projects inside it. These cities was distinguished by development of river edge as creating place along the river corridor and try to attract peoples who lived in, protect the natural environment along the river, as well as reflect the characteristics of the city along of the elevation of the river, and conserve the river banks as alley connected between urban spaces. Baghdad which penetrates by Tigris River has maintained this feature until the middle of twentieth century. So now, the research can see the absence of specialized local studies, including The comprehensive development plan of the Baghdad city 2030 to study and Re design the spaces and places along river edge, this led to emerge research problem, in the absence of specific knowledge about identity of river space characteristics for identification of urban space in place of the Tigris River in downtown of Baghdad historical city center, in the urban development plans since the mid-twentieth century until now, and study design factors that contributed with disintegration of the space syntax relations in river elevation. Turning to the experience of historical European cities and how to deal with urban space to the edge of the river and created the identity of the place, especially the interface development experience the (Seine river in Paris, Thames River in London, Tiber River in Rome, Danube River in Vienna & Budapest, Vltava river in Prague) and study urban style in dealing with the river edge, in order to reach the elements which define the identity of each city. In order to reach the aim of research in redefining the identity of places for urban spaces overlooking to integrate the banks of Tigris River in the historical city centre of Baghdad, and the methods of linking the development of river front with the comprehensive development plan of the Baghdad city 2030.

River's Edge Construction: Third-Grade Students Engineer Solutions to Prevent Local Flooding

River's Edge Construction: Third-Grade Students Engineer Solutions to Prevent Local Flooding

PEMANFAATAN JENIS-JENIS MANGROVE SEBAGAI PRODUK MAKANAN OLAHAN DI MUARA BADAK ULU, KUTAI KARTANEGARA

Food production derived from processed types of mangroves fruit does not appear to have been widely developed or in demand by the Muara Badak community. Many people are unaware that mangrove fruit can be consumed and used as food or snacks. The potential and benefits of mangroves as a food source are still unknown and underutilized. This activity aims to disseminate information about the benefits of various types of fruit processing mangroves into processed food products through socialization. Sonneratia ovata (Pedada), a variety of mangroves that grows abundantly on the river's edge in the village of Muara Badak Ulu, is one of them. This activity was carried out on farmers and communities in the Salo Sumbala watershed in Kutai Kartanegara Regency, Muara Badak Subdistrict, and Muara Badak Ulu village. The approach taken in this activity is to lecture and provide knowledge about the many species of mangroves found in the vicinity of Muara Badak Ulu, particularly the Salo Sumbala watershed, which has the potential to produce processed food from mangrove fruit.

Real-Time Properties of Hydraulic Jump off a Tidal Bore, Its Generation and Transport Mechanisms: A Case Study of the Kampar River Estuary, Indonesia

Since the hydraulic jump off a tidal bore in the Kampar Estuary has never been well-described, real-time measurements of hydraulic jump properties are crucial to understanding the tidal bore characteristics. This study aims to determine the real-time properties of a tidal bore generation, hydraulic jump, and transport mechanism in the Kampar River estuary. Tidal harmonic and range are analyzed using least-square-based tidal modeling. The tidal bore height and turbulent velocity records based on ADCP surveys in the estuary and upstream area are used to determine the hydraulic jump properties. Furthermore, an acoustic-based approach is also employed to quantify the suspended sediment concentration and flux during the passage of the bore. Kampar Estuary is predominated by semidiurnal co-tidal components (M2 and S2), where, based on the phase lag magnitude, it is categorized as an ebb-dominant estuary. This finding is proven by the more intense and prolonged ebb phases, especially during spring tidal conditions where the tidal range reaches 4 m. Of particular concern, the tidal bore height declines by 1.5 m every 20 km upstream with an erratic turbulent velocity. A sudden increase in transverse and vertical velocity during the passage of bore (ranging from −0.9 to 0.2 m/s) reflects the potency of sediment resuspension in the surrounding river edge marked by the significant increase in suspended sediment flux of about 3.7 times larger than at the end of the ebb tide. However, long-term measurement and regular bathymetry surveys are crucial to monitor the tidal bore behavior and morpho-dynamics in the Kampar River estuary.

River edge feeding: Howler monkey feeding ecology in a fragmented riparian forest

Abstract Rivers are important components of animal habitats worldwide. The area near riparian edge (⩽100 m from the river) has different abiotic characteristics and vegetation than both forest interior and areas bordering human development, which may lead to differences in animal feeding behaviour. To better contextualize the impact of human-caused habitat destruction on animal feeding ecology, it is important to study both natural riparian and anthropogenic forest edges within the same habitat. We compared howler monkey (Alouatta palliata) feeding behaviour and tree use across four forest zones (riparian edge, anthropogenic edge, forest interior, and combined riparian and anthropogenic edge) in a fragmented riparian rainforest in Costa Rica, La Suerte Biological Research Station (LSBRS). We predicted that monkey feeding behaviour and tree use would differ across forest zones, and especially between riparian and anthropogenic edges due to higher vegetation quality near the river. We observed individual focal monkeys for 30-minute periods, collecting data on monkey feeding behaviour and tree use every 2 minutes. We recorded plant parts eaten and feeding tree taxonomy, and measured feeding trees. Monkeys ate more leaves in riparian edge than in other forest zones, and fed from fewer tree families in riparian edge and forest interior compared to anthropogenic edge. Monkeys also fed from trees with smaller DBH in riparian edge compared to other forest zones, but trees of similar height to forest interior and taller than anthropogenic edge. Our results indicate that riparian zones are rich habitats for howler monkeys and conservation efforts should prioritize their preservation.

River distance, stand basal area, and climatic conditions are the main drivers influencing lying deadwood in riparian forests

Riparian forests are among the most diverse terrestrial ecosystems, yet their biodiversity is increasingly threatened by habitat degradation, climate change, river regulation and invasive species. We investigated deadwood, widely recognized as an indicator for forest biodiversity, in riparian forests of the Mura-Drava-Danube Transboundary Biosphere Reserve. The Biosphere Reserve is a conservation area that spans five countries and three rivers located in south-eastern Europe. In detail, we analyzed the drivers of lying deadwood volume, occurrence and decay related to floodplain type, silvicultural management, and climatic conditions using regression models. Lying deadwood occurrence and volume significantly decreased as distance from the river edge increased, indicating that river dynamics likely play a role in deadwood accumulation in riparian forests. Deadwood volume was also positively influenced by stand basal area, a parameter that can be directly addressed by silvicultural management. Deadwood decay was affected positively by temperature and negatively by precipitation, highlighting the importance of climatic conditions on decay progression. However, in order to draw more accurate conclusions about the drivers and dynamics of deadwood in riparian forests, further monitoring efforts that consider river flooding and flow regime, deadwood transport and saproxylic organism activity in addition to forest management and site conditions, are needed.

FEASIBILITY STUDY OF COMMUNAL DOMESTIC WASTEWATER TREATMENT PLANT IN SEKANAK AREA, PALEMBANG CITY

Pollution, whether in the form of domestic wastewater or solid waste generated by daily activity, is to blame for this. In Indonesia, most domestic wastewater treatment still takes place locally, on-site, for instance, using septic tanks. The septic tank essentially only serves to precipitate the sludge content in home waste water, allowing it to contaminate soil, ground water, and eventually surface water bodies. There have been several domestic wastewater treatment facilities (WWTP) in Palembang City throughout the previous five years, both on a local and regional level, all of which are still in use. One of the city of Palembang's current WWTP facilities, Sekanak's WWTP is located not far from the river's edge. This WWTP was constructed to deal with the liquid waste generated by households in order to prevent direct pollution of the Sekanak River. This study used a quantitative descriptive method to accurately explain and represent the field circumstances based on the quantitative data that was collected. Installing an equalization tank in accordance with the input discharge to balance out the discharge of the collection tank and the discharge of the incoming wastewater will improve the old Sekanak WWTP. This method can be used to lessen and prevent water quality pollution from WWTP outputs.

Spatial Equity in River Access. Measuring the Public Space Potential of Urban Riverbanks in Valdivia, Chile

This paper seeks to evaluate the public space potential of riverbanks in the case of the city of Valdivia. The main goal of this research is to understand the relationships that promote or hinder the equitable enjoyment of watercourses and riverbanks. In the case of river access, spatial equity will be considered as the possibility for all inhabitants to access the benefits and resources of the river in their daily lives. Different analytical techniques and quantitative data were used to explore the relationships between socioeconomic characteristics, like socioeconomic groups and land value in the riverbank urban area. This evaluation will be applied by river edge transects. This article is a contribution to the theoretical discussion of social equity in urban riverfronts as an application in the case study since there are few studies on river banks from this perspective. Lack of a comprehensive shore planning in waterfront neighborhoods and of diverse public spaces impedes due public riverside and water use, as well as neglects ecological deterioration processes and social vulnerability.

Community Empowerment Through Red Onion Cultivation with Polybags on 1 Ilir Urban Village, Palembang City

1 Ilir Urban Village is a village located on the Musi River edge. These Urban Village is quite broad, however underdeveloped area compared to other places in the city of Palembang. Many people live below the poverty line, lack green open space, and have inadequate educational facilities. Most of the population earns a living as laborers, while the women are ordinary housewives. To increase the income of homemakers in helping to improve the family's economy, we conduct training to increase community knowledge in red onion cultivation in polybags by utilizing a narrow yard of the house. The purpose of the activity is to provide motivation, knowledge, and skills to residents, especially housewives, by using the house's yard for onion cultivation to increase productivity and welfare. The methods used to achieve the objectives are surveys, counseling, and training the community on the use of yard land for onion cultivation in polybags and direct practice of red onion cultivation. Based on the process and results of the service that has been carried out, the training participants are very enthusiastic and understand and can carry out onion cultivation in polybags.

From the River to the Soul: Connections between From the River's Edge and Daughters of the Stone

Abstract: This reflective essay reveals the parallel experiences in the selected literary works of imposed colonial history and ancestral wounds borne over generations. Along with this is the sense of injustice committed by whites and the impact that injustice dictated as permitted in the name of the "God's chosen" settlers. Thus, the connections between the ancestors of African people in the Caribbean and Native Americans are intriguing and should be explored. Puerto Rican author Dahlma Llanos-Figueroa's work in Daughters of the Stone ties in harmoniously with Elizabeth Cook-Lynn's From the River's Edge and the struggles and the war that the characters go through against the ridicule and cruelty of the white colonizers or masters. This is done through a respectful journey of self-discovery and healing from the past.

Evolution of Edges and Porosity of Urban Blue Spaces: A Case Study of Gdańsk

Current waterfront studies focus mainly on a land-based perspective, failing to include the water side. Water is, however, not just a resource for port and industrial purposes and an edge to the waterfront; it is also a feature of the waterfront and the complex relation between water and city. Thus, the article suggests that water-land edges need to be re-contextualised, taking into consideration also their shape, functionality, and evolution over time. This article therefore introduces the concept of urban blue spaces, that is, spaces that include at least one land-water edge, such as a shoreline or river edge. The types and character of these edges define the porosity of urban blue spaces: Spaces with easy connections, such as boulevards or parks, are highly porous, while fenced areas have low porosity. The research first analyses the existing literature on the spatial and functional characteristics of the land-water edge in port cities, and explores existing typologies of urban blue spaces. The results of this investigation are used to examine the most iconic urban blue space of Gdańsk, the Motława river, over the last 1000 years. The case study shows that the porosity of the Gdańsk urban blue space has been increasing over time, in line with its spatial and functional development from an undeveloped riverbank to a ‘gated’ port and industry area, to urban living spaces today. The article thus presents the whole breadth of urban blue spaces through the case study of the Motława river urban blue space. The spatial evolution of the urban blue space is depicted through the transformation of its land-water edge—from a natural sloping edge to the dominance of vertical edged structures or ones overhanging the surface of the water, to the emergence of spatially ‘blurred’ sloping, slanted, terraced, and floating structures, partially independent of the riverbank. The transformation of the structure of the Motława urban blue space edges increased its complexity over time, from a single-edge structure to a double and multiple-edged one.

Differences in web structure of Tetragnatha tenuissima (Araneae: Tetragnathidae) due to environmental conditions

Spiders can modify their web construction behaviour according to environmental conditions. Here, we examined how the web structure of Tetragnatha tenuissima differentiates depending on habitat type (swamp or river edge) at La Selva Biological Station, Costa Rica. We characterized the web architecture based on length, number of radii, and the spiral spacing relative to web length. There were no significant differences on the length or number of radii between the webs present in the swamp and river habitats. In terms of the spiral spacing relative to web length, there was a significant difference between habitats, with less distance in river-side webs than in the ones on swamps. This could be explained by the potential differential resource availability on each environment. Therefore, habitat type appears as an explanatory variable for differences on the web structure of T. tenuissima. Due to the small number of identifiable individuals of other Tetragnatha species, the effect of congeneric species co-occurrence on web structure remains as a factor to be tested in future research.