Insect dispersal ability is crucial to overcome limitations in patch colonization of Eichhornia crassipes floating meadows

García-Ríos, Raúl; Moi, Dieison André; Melo, Adriano S.; Mormul, Roger Paulo

doi:10.1007/s10201-021-00688-6

Cited by 2 publications

(1 citation statement)

References 51 publications

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“…Knowledge of the movement of individual insects within heterogenous habitats would be helpful in estimating such dispersal potentials. In this paper we focus on flying insects that have strong dispersal ability (Garcia-Rios et al 2022). These need to maintain appropriate directions, altitudes and ground speeds in order to realize their dispersal potential in these highly dynamic environments in which strong air flows can influence flight.…”

Section: Introductionmentioning

confidence: 99%

Interactions between diurnal winds and floodplain mosaics control the insect boundary layer in a river corridor

Sukhodolov,

Manfrin,

Larsen

et al. 2023

Aquat Sci

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Insect flight along river corridors is a fundamental process that facilitates sustainable succession and diversity of aquatic and terrestrial insect communities in highly dynamic fluvial environments. This study examines variations in the thickness of the insect boundary layer (i.e., the pre-surface atmosphere layer in which air velocity does not exceed the sustained speed of flying insects) caused by interactions between diurnal winds and the heterogenous habitat mosaics in the floodplain of a braided river. Based on advective–diffusive theory, we develop and test a semi-empirical model that relates vertical flux of flying insects to vertical profiles of diurnal winds. Our model suggests that, in the logarithmic layer of wind, the density of insect fluxes decreases exponentially with the altitude due to the strong physical forcing. Inside the insect boundary layer, the insect fluxes can increase with the altitude while the winds speed remains nearly constant. We suggest a hypothesis that there is a close correspondence between the height of discontinuity points in the insect profiles (e.g. points with abrupt changes of the insect flux) and the displacement heights of the wind profiles (e.g. points above which the wind profile is logarithmic). Vertical profiles were sampled during three time-intervals at three different habitat locations in the river corridor: a bare gravel bar, a gravel bar with shrubs, and an island with trees and shrubs. Insects and wind speed were sampled and measured simultaneously over each location at 1.5-m intervals up to approximately 17 m elevation. The results support our working hypothesis on close correspondence between discontinuity and displacement points. The thickness of the insect boundary layer matches the height of the discontinuity points and was about 5 m above the bare gravel bar and the gravel bar with shrubs. Above the island, the structure of the insect boundary layer was more complex and consisted of two discontinuity points, one at the mean height of the trees’ crowns (ca. 15 m), and a second, internal boundary layer at the top of the shrubs (ca. 5 m). Our findings improve the understanding of how vegetation can influence longitudinal and lateral dispersal patterns of flying insects in river corridors and floodplain systems. It also highlights the importance of preserving terrestrial habitat diversity in river floodplains as an important driver of both biotic and abiotic (i.e., morphology and airscape) heterogeneity.

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Section: Introductionmentioning

confidence: 99%

Interactions between diurnal winds and floodplain mosaics control the insect boundary layer in a river corridor

Sukhodolov,

Manfrin,

Larsen

et al. 2023

Aquat Sci

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Effects of the main media of wind and water on the biodiversity pattern of grassland and its driving mechanism in Poyang Lake

Shang,

Chen

2024

Ecohydrology

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As important media for species diffusion, water and wind are two important factors for grassland biodiversity conservation in lake areas. Exploring their driving mechanism on grassland biodiversity is crucial for maintaining the lake ecosystem's equilibrium. Our study utilizes the data of wind velocity and water level, which are significant performance factors for wind and water respectively in Poyang Lake from 2000 to 2020 to reveal their interannual time‐series fluctuation characteristics and their influence mechanism on the grassland biodiversity pattern. Landscape pattern indices and biodiversity indicators, such as the number of patches (NP), patch density (PD), landscape spreading index (CI), landscape fragmentation index (LSD), landscape aggregation index (AI), Simpson diversity index (MSIDI) and Simpson evenness index (MSIEI) were analysed, trend analysis, redundancy analysis and structural equation modelling were applied in this study. The main results were: (1) From 2000 to 2020, Poyang Lake's wind velocity decreased gradually, and the water level first decreased and then rose. NP in Poyang Lake fluctuated substantially, LSD fluctuated frequently and obvious temporal heterogeneity existed. (2) CI and AI increased from low to high value, facilitating species dispersal and migration. The dominant species with high aggregation gradually established stronger connectivity. Moderate spreading degree and aggregation degree maintained high biodiversity and evenness, whereas excessive spreading degree and aggregation degree led to homogenization of species, decrease in biodiversity, reduction in species evenness, and increase in dominance. (3) As the landscape transformed from having no obvious dominant species to being dominated by several dominant species, MSIEI and landscape dominance changed from high to low and low to high respectively. Moreover, the biodiversity shifted from high to low, and species distribution in the landscape shifted from balanced to unbalanced. (4) The effect of water level on PD, AI, LSD, MSIDI and MSIET was significantly higher than that of wind velocity. LSD was mainly regulated by the minimum wind velocity affecting the maximum and average water levels. MSIDI and MSIET were primarily governed by the minimum wind velocity affecting the minimum water level. The minimum water level decreased as the minimum wind velocity increased, and MSIDI and MSIET weakened as the minimum water level decreased.

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Insect dispersal ability is crucial to overcome limitations in patch colonization of Eichhornia crassipes floating meadows

Cited by 2 publications

References 51 publications

Interactions between diurnal winds and floodplain mosaics control the insect boundary layer in a river corridor

Interactions between diurnal winds and floodplain mosaics control the insect boundary layer in a river corridor

Effects of the main media of wind and water on the biodiversity pattern of grassland and its driving mechanism in Poyang Lake

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