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FIGURE 4 in Morphological divergences as drivers of diet segregation between two sympatric species of Serrapinnus (Characidae: Cheirodontinae) in macrophyte stands in a neotropical floodplain lake

FIGURE 4 | Canonical variate analysis illustrating differences in morphological traits for the Serrapinnus notomelas and Serrapinnus sp.1 in a lake in the upper Paraná River floodplain, Brazil. CI – Compression index; DI – Depression index; RLPd – Relative lenght of caudal peduncule; RHPd – Relative height of caudal peduncule; RWPd –Relative width of caudal peduncule; RAD – Relative area of dorsal fin; ARC – Aspect ratio of caudal fin; ARA – Aspect ratio of anal fin; ARPt – Aspect ratio of pectoral fin; ARPv – Aspect ratio of pelvic fin; RLHd – Relative length of head; RHHd – Relative height of head; RWHd – Relative width of head; RHM – Relative height of mouth; RWM – Relative width of mouth; EP – Relative position of eye; MT – multicuspid teeth; PT – pentacuspid teeth; ICO – Intestinal coefficient; GRL – Gill raker length.

FIGURE 2 in Morphological divergences as drivers of diet segregation between two sympatric species of Serrapinnus (Characidae: Cheirodontinae) in macrophyte stands in a neotropical floodplain lake

FIGURE 2 | Number of individuals from Serrapinnus notomelas and Serrapinnus sp.1 sampled concerning precipitation (mm) between October/2010 and March/2012 in a lake in the upper Paraná River floodplain, Brazil. SnA = S. notomelas Adult; SnJ = S. notomelas juvenile; Sp1A = Serrapinnus sp.1 adult; Sp1J = Serrapinnus sp.1 juvenile.

FIGURE 3 in Morphological divergences as drivers of diet segregation between two sympatric species of Serrapinnus (Characidae: Cheirodontinae) in macrophyte stands in a neotropical floodplain lake

FIGURE 3 | Variation in the diet breadth of Serrapinnus notomelas and Serrapinnus sp.1 using PERMDISP, for the juveniles and adults in a lake in the upper Paraná River floodplain, Brazil. Boxes represent the 25th and 75th quartiles and demonstrate the individual variation of the trophic niche. The horizontal bars in each box represent the average niche breadth. Whiskers indicate the range and individual symbols indicate outliers. J=juveniles; A= adults.

FIGURE 1 in Morphological divergences as drivers of diet segregation between two sympatric species of Serrapinnus (Characidae: Cheirodontinae) in macrophyte stands in a neotropical floodplain lake

FIGURE 1 | Study area: location of sampling site in the upper Paraná River floodplain, Mato Grosso do Sul State, Brazil.

Fig. 3 in Ecomorphology and use of food resources: inter- and intraspecific relationships of fish fauna associated with macrophyte stands

Fig. 3. Distribution of species scores in the multivariate ecomorphological space generated by the first two PCA axes. In each diagram, the species scores were distinguished by black symbols. A polygon was used to delimit the population ecomorphological space.

Fig. 1 in Ecomorphology and use of food resources: inter- and intraspecific relationships of fish fauna associated with macrophyte stands

Fig. 1. Map depicting location of the lagoons studied (PU - Pousada das Garças; PO - Porcos; ML - Maria Luiza; ON - Onça; AS -Água Suja; XI - Xirica; PM - Pombas; IP - Ilha do Pacu; BI - Ressaco do Bilé; GA - Garças) in the Upper Paraná River floodplain, Brazil.

Fig. 2 in Ecomorphology and use of food resources: inter- and intraspecific relationships of fish fauna associated with macrophyte stands

Fig. 2. Distribution of species scores in the multivariate ecomorphological space generated by the first two PCA axes (axis 1: eigenvalue = 4.3 and explained variability (%) = 20.474; axis 2: eigenvalue = 3.4 and explained variability (%) =16.434). The main variables responsible for explaining the ordination pattern are indicated in each axis (eigenvectors axis 1: compression index = 0.9006, relative area of the anal fin = 0.6539, relative width of the mouth = 0.6068, relative height of the caudal peduncle = -0.9125 and relative length of the caudal peduncle = -0.8237; eigenvectors axis 2: aspect ratio of the pectoral fin = 0.6544, aspect ratio of the caudal fin = 0.5162, aspect ratio of the anal fin = 0.5145, relative area of the pectoral fin = -0.7929 and relative area of the dorsal fin = -0.7373).

Fig. 4 in Ecomorphology and use of food resources: inter- and intraspecific relationships of fish fauna associated with macrophyte stands

Fig. 4. Simple linear regressions between the Standardized Levins Index (Bi) and the ecomorphological distances calculated for populations analyzed. Significance values of the models are indicated (p).

opencc-by-4.0Dec 2008View details →

Fig. 2 in Simple relationships to predict attributes of fish assemblages in patches of submerged macrophytes

Fig. 2. Correlation coefficients (Pearson's R) obtained from relationships between fish assemblage attributes (a: density; b: species richness) and habitat variables (macrophyte biomass, BIOM; volume, VOL; proportional volume, %VOL). We show correlation results from all patches (All), patches dominated by E. densa and patches dominated by E. najas. All correlations were statistically significant (p <0.05).

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Data from: Unique roles of functional group of submerged macrophytes on ecosystem functions

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publicDec 2025View details →

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Quantifying the ecological impacts of alien aquatic macrophytes: A global meta‐analysis of effects on fish, macroinvertebrate and macrophyte assemblages

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publicAug 2022View details →

opencc-zeroFeb 2024View details →

Macroinvertebrate and environmental responses to dredging and submerged macrophytes transplantation

Eutrophication of freshwater ecosystems is a major global problem, but restoration can be difficult due to ongoing problems relating to water pollution, sedimentary nutrient stores, and altered aquatic biodiversity. Mitigation of water quality stressors is often conducted alongside transplantation of submerged macrophytes and dredging, but knowledge of ecosystem response to post-dredging transplantation of submerged macrophytes is limited. Here, we report a long-term (2008-2018) in-situ monitoring study to evaluate the effects of two different restoration measures: dredging only (Dredged) and dredging with post-dredging transplantation of submerged macrophytes (Dredged with macrophytes) conducted in five subtropical eutrophic lakes in Lake Taihu basin, China. Water and sediment nutrients, bloom-forming algae Microcystis, and macroinvertebrate were monitored every two years for each treatment and compared with reference areas (Control) established in unrestored parts of the same lakes. Dredging only decreased sediment nutrients (nitrogen, phosphorus, total carbon, and water total phosphorus significantly, however, this effect diminished about five years later. Dredged with macrophytes had a stronger, longer-lasting positive effect on water quality than Dredged alone. Disturbance caused by dredging (without macrophytes transplantation) decreased the biomass of Microcystis, while transplantation of submerged macrophytes shortly after dredging did not contribute to the decrease of Microcystis biomass. The biomass of Microcystis in Dredged with macrophytes areas was always similar to Control over the period of our monitoring. A positive effect of submerged macrophytes transplantation post-dredging was found for macroinvertebrate abundance and diversity: Dredged with macrophytes areas had significantly higher macroinvertebrate biomass and richness than Dredged areas after 9 years' recovery. Macroinvertebrate richness in Dredged with macrophytes areas nearly doubled compared to Control; while Dredged areas were just restored to Control levels. Synthesis and applications. Our study provides an in-situ long-term field monitoring with new findings about the benefits and caution of submerged macrophytes transplantation post-dredging, and the effect of partial restoration, which could inform eutrophic waterbody restoration schemes.

opencc-zeroDec 2019View details →

Relationships between allometric patterns of the submerged macrophyte Vallisneria natans, its stoichiometric characteristics, and the water exchange rate

Variation in the water exchange rate (WER) of freshwater lakes has recently been demonstrated to affect the phenotypic traits of submerged macrophytes. However, whether these responses are size-dependent ("apparent plasticity") or not ("real plasticity") remains unclear. Here, we used allometric analysis to investigate phenotypic plasticity, and the carbon, nitrogen, and phosphorus stoichiometry of the submerged macrophyte Vallisneria natans cultured for 15, 30, 45, and 65 days under three levels of WER (0, 20, and 40% exchange of total volume day-1). Result showed that biomass accumulation, below-: above-ground biomass ratio, root length, root diameter, leaf length, and leaf width significantly decreased with increasing WER; however, specific root length was unaffected, and specific leaf area (SLA) gradually increased with increasing WER through the whole experiment. Allometric analyses showed that shifts in leaf width and SLA were determined solely by changes in plant size; all other morphological adjustments were largely size-dependent. Stoichiometric calculations indicated that ramets were mainly N-limited, and this limitation was significantly associated with leaf growth, thereby restricting the potential for real plasticity in leaf morphologies. Thus, V. natans adapts to WER variation largely through apparent plastic responses that reduce the demand for plant nutrients.

opencc-zeroApr 2022View details →

Data from: Snail communities increase submerged macrophyte growth by grazing epiphytic algae and phytoplankton in a mesocosm experiment

The relationships between producers (e.g., macrophytes, phytoplankton and epiphytic algae) and snails play an important role in maintaining the function and stability of shallow ecosystems. Complex relationships exist among macrophytes, epiphytic algae, phytoplankton and snails. We studied the effects of snail communities (consisting of Radix swinhoei, Hippeutis cantori, Bellamya aeruginosa and Parafossarulus striatulus) on the biomass of phytoplankton and epiphytic algae as well as on the growth of three species of submerged macrophytes (Hydrilla verticillata, Vallisneria natans and one exotic submerged plant, Elodea nuttallii) in a 90-day outdoor mesocosm experiment conducted on the shore of subtropical Lake Liangzihu, China. This dataset including morphological data of three group organisms: freshwater snails, macrophytes and epiphytic algae. In addition, the environmental parameters were included. Morphological data of snails is including biomass (g) and number (ind.). Morphological data of macrophytes is including biomass (g). Epiphytic algae data is including abundance (N, cells). Phytoplankton data is including biomass (Chl-a, μg/L).

opencc-zeroApr 2022View details →

Nestedness theory suggests wetland fragments with large areas and macrophyte diversity benefit waterbirds

Many artificial wetland constructions are currently underway worldwide to compensate for the degradation of natural wetland systems. Researchers face the responsibility of proposing wetland management and species protection strategies to ensure that constructed wetlands positively impact waterbird diversity. Nestedness is a commonly occurring pattern for biotas in fragmented habitats with important implications for conservation; however, only a few studies have focused on seasonal waterbird communities in current artificial wetlands. In this study, we used the nestedness theory for analyzing the annual and seasonal community structures of waterbirds in artificial wetlands at Lake Dianchi (China) to suggest artificial wetland management and waterbird conservation strategies. We carried out three waterbird surveys per month for one year to observe the annual, spring, summer, autumn, and winter waterbird assemblages in 27 lakeside artificial wetland fragments. We used the NeD program to quantify nestedness patterns of waterbirds at the annual and seasonal levels. We also determined Spearman partial correlations to examine the associations of nestedness rank and habitat variables to explore the factors underlying nestedness patterns. We found that annual and all four seasonal waterbird compositions were nested, and selective extinction and habitat nestedness were the main factors governing nestedness. Further, selective colonization was the key driver of nestedness in autumn and winter waterbirds. We suggest that the area of wetland fragments should be as large as possible and that habitat heterogeneity should be maximized to fulfill the conservation needs of different seasonal waterbirds. Furthermore, we suggest that future studies should focus on the least area criterion, and that vegetation management of artificial wetland construction should be based on the notion of sustainable development for humans and wildlife.

opencc-zeroJun 2022View details →

Data for: Interactive effects of light and snail herbivory rather than nutrient loading determine early establishment of submerged macrophytes

Submerged macrophytes play a key role in maintaining a clear-water phase and promoting biodiversity in shallow aquatic ecosystems. Since their abundance has declined globally due to anthropogenic activities, it is important to include them in aquatic ecosystem restoration programs. Macrophytes establishment in early spring is crucial for the subsequent growth of other warm-adapted macrophytes. However, factors affecting this early establishment of submerged macrophytes have not been fully explored yet. Here, we conducted an outdoor experiment from winter to early spring using the submerged macrophytes Potamogeton crispus and Vallisneria spinulosa to study the effects of shading, nutrient loading, snail herbivory (Radix swinhoei) and their interactions on the early growth and stoichiometric characteristics of macrophytes. The results show that the effects strongly depend on macrophyte species. Biomass and number of shoots of P. crispus decreased, and internode length increased during low light conditions, but were not affected by nutrient loading. P. crispus shoot biomass and number showed hump-shaped responses to increased snail biomass under full light. In contrast, the biomass of the plant linearly decreased with snail biomass under low light. This indicates an interaction of light with snail herbivory. Since snails prefer grazing on periphyton over macrophytes, a low density of snails promoted growth of P. crispus by removing periphyton competition, while herbivory on the macrophyte increased during a high density of snails. The growth of V. spinulosa was not affected by any of the factors, probably because of growth limitation by low temperature. Our study demonstrates that the interaction of light with snail herbivory may affect establishment and growth of submerged macrophytes in early spring. Macrophyte restoration projects may thus benefit from lowering water levels to increase light availability and making smart use of cold-adapted herbivores to reduce light competition with periphyton.

opencc-by-4.0Dec 2023View details →

Datasets and code for Dražina et al. 2023: Unravelling the Role of Top Predators and Macrophytes in Mediterranean Ponds: The Ecological Significance of Rotifers

Dataset and R code to accompany manuscript 'Unravelling the Role of Top Predators and Macrophytes in Mediterranean Ponds: The Ecological Significance of Rotifers' accepted for publication in the journal Hydrobiologia

opencc-by-4.0Dec 2015View details →

Fig. 1 in Macrophyte Vegetation Assessment In Streams Of The Venta River Basin District

Fig. 1. Location of sampling sites in the Venta River Basin district, Latvia.

opencc-by-4.0Dec 2015View details →

Fig. 3 in Macrophyte Vegetation Assessment In Streams Of The Venta River Basin District

Fig. 3. Correlation between species richness and ammonium nitrogen (N-NH4+).