Contaminants in linked aquatic–terrestrial ecosystems: Predicting effects of aquatic pollution on adult aquatic insects and terrestrial insectivores

2019 ◽  
Vol 38 (4) ◽  
pp. 919-927 ◽  
Author(s):  
Johanna M. Kraus
Keyword(s):  
Aquatic Insects ◽  
Terrestrial Ecosystems ◽  
Aquatic Pollution ◽  
Adult Aquatic Insects

Spatial and seasonal variability of emergent aquatic insects and nearshore spiders in a subtropical estuary

2019 ◽  
Vol 70 (4) ◽  
pp. 541 ◽  
Author(s):  
Martha J. Zapata ◽  
S. Mažeika P. Sullivan
Keyword(s):  
Aquatic Insects ◽  
High Salinity ◽  
Aquatic Insect ◽  
Freshwater Ecosystems ◽  
Dispersal Ability ◽  
Insect Community ◽  
Insect Communities ◽  
Low Salinity ◽  
Subtropical Estuary ◽  
Adult Aquatic Insects

Variability in the density and distribution of adult aquatic insects is an important factor mediating aquatic-to-terrestrial nutritional subsidies in freshwater ecosystems, yet less is understood about insect-facilitated subsidy dynamics in estuaries. We surveyed emergent (i.e. adult) aquatic insects and nearshore orb-weaving spiders of the families Tetragnathidae and Araneidae in a subtropical estuary of Florida (USA). Emergent insect community composition varied seasonally and spatially; densities were lower at high- than low-salinity sites. At high-salinity sites, emergent insects exhibited lower dispersal ability and a higher prevalence of univoltinism than low- and mid-salinity assemblages. Orb-weaving spider density most strongly tracked emergent insect density rates at low- and mid-salinity sites. Tetragnatha body condition was 96% higher at high-salinity sites than at low-salinity sites. Our findings contribute to our understanding of aquatic insect communities in estuarine ecosystems and indicate that aquatic insects may provide important nutritional subsidies to riparian consumers despite their depressed abundance and diversity compared with freshwater ecosystems.

Movements of adult aquatic insects near streams in Southern Ontario

Hydrobiologia ◽  
1981 ◽  
Vol 77 (1) ◽  
pp. 65-69 ◽  
Author(s):  
G. A. Bird ◽  
H. B. N. Hynes
Keyword(s):  
Aquatic Insects ◽  
Southern Ontario ◽  
Adult Aquatic Insects

scholarly journals Preliminary Estimations of Insect Mediated Transfers of Mercury and Physiologically Important Fatty Acids from Water to Land

Biomolecules ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 129 ◽  
Author(s):  
Sydney Moyo
Keyword(s):  
Fatty Acids ◽  
Food Webs ◽  
Organic Contaminants ◽  
Aquatic Insects ◽  
Total Mercury ◽  
Empirical Studies ◽  
Aquatic Insect ◽  
Terrestrial Ecosystems ◽  
Energy Subsidy

Aquatic insects provide an energy subsidy to riparian food webs. However, most empirical studies have considered the role of subsidies only in terms of magnitude (using biomass measurements) and quality (using physiologically important fatty acids), negating an aspect of subsidies that may affect their impact on recipient food webs: the potential of insects to transport contaminants (e.g., mercury) to terrestrial ecosystems. To this end, I used empirical data to estimate the magnitude of nutrients (using physiologically important fatty acids as a proxy) and contaminants (total mercury (Hg) and methylmercury (MeHg)) exported by insects from rivers and lacustrine systems in each continent. The results reveal that North American rivers may export more physiologically important fatty acids per unit area (93.0 ± 32.6 Kg Km−2 year−1) than other continents. Owing to the amount of variation in Hg and MeHg, there were no significant differences in MeHg and Hg among continents in lakes (Hg: 1.5 × 10−4 to 1.0 × 10−3 Kg Km−2 year−1; MeHg: 7.7 × 10−5 to 1.0 × 10−4 Kg Km−2 year−1) and rivers (Hg: 3.2 × 10−4 to 1.1 × 10−3 Kg Km−2 year−1; MeHg: 3.3 × 10−4 to 8.9 × 10−4 Kg Km−2 year−1), with rivers exporting significantly larger quantities of mercury across all continents than lakes. Globally, insect export of physiologically important fatty acids by insect was estimated to be ~43.9 × 106 Kg year−1 while MeHg was ~649.6 Kg year−1. The calculated estimates add to the growing body of literature, which suggests that emerging aquatic insects are important in supplying essential nutrients to terrestrial consumers; however, with the increase of pollutants in freshwater systems, emergent aquatic insect may also be sentinels of organic contaminants to terrestrial consumers.

Inland dispersal of adult aquatic insects

1996 ◽  
Vol 36 (2) ◽  
pp. 265-276 ◽  
Author(s):  
ZSOLT KOVATS ◽  
JAN CIBOROWSKI ◽  
LYNDA CORKUM
Keyword(s):  
Aquatic Insects ◽  
Adult Aquatic Insects

Movements of adult aquatic insects along a Montana (USA) springbrook

1988 ◽  
Vol 10 (2) ◽  
pp. 99-104 ◽  
Author(s):  
Thomas S. Jones ◽  
Vincent H. Resh
Keyword(s):  
Aquatic Insects ◽  
Adult Aquatic Insects

scholarly journals Monitoring of adult aquatic insect activities and ecological role in the riparian zone of streams in the Western Ghats, India

2016 ◽  
Vol 4 (3) ◽  
pp. 460
Author(s):  
T. Kubendran ◽  
M. Ramesh
Keyword(s):  
Aquatic Insects ◽  
Western Ghats ◽  
Riparian Zone ◽  
Food Resource ◽  
Aquatic Insect ◽  
Ecological Role ◽  
Freshwater Biodiversity ◽  
The Western Ghats ◽  
Adult Aquatic Insects

<div><p><em>The Western Ghats, running parallel to the west coast of India between 8° N and 21° N is a prominent feature of the peninsular India. In freshwater biodiversity hotspots like the Western Ghats, no information is available on activates and ecological role of adult aquatic insect in the riparian zone of streams.</em><strong><em> </em></strong><em>Most adult aquatic insects that emerge from streams live briefly in the nearby riparian zone. Adult activities, such as mating dispersal and feeding influence their distribution in the terrestrial habitat. An observation at Kurangani streams, Western Ghats, India has shown that both numbers and biomass of adult aquatic insects are greatest in the near stream vegetation; however, adult insects can be relatively common 1 to 10 feet from the stream. Why because, adult aquatic insects are abundant and they are primary food resource for many riparian insectivores. The role of adult aquatic insects in the riparian zone must be better understood for riparian and aquatic food chain to be complete. </em></p></div>

Distribution and trophic dynamics of riparian tetragnathid spiders in a large river system

2016 ◽  
Vol 67 (3) ◽  
pp. 309 ◽  
Author(s):  
Paradzayi Tagwireyi ◽  
S. Mažeika P. Sullivan
Keyword(s):  
Aquatic Insects ◽  
Trophic Position ◽  
River System ◽  
Benthic Algae ◽  
Terrestrial Ecosystems ◽  
Large River ◽  
Trophic Dynamics ◽  
Rural Landscapes ◽  
Small Streams ◽  
Insect Density

Development and agriculture are increasingly encroaching into riparian areas, with largely unknown effects on nearshore arthropods, which are important components of linked aquatic–terrestrial food webs. To assess the environmental determinants of the distribution and trophic dynamics of riparian spiders of the family Tetragnathidae, we characterised riparian habitat, collected emergent aquatic insects, and surveyed spiders in developed and rural landscapes of the Scioto River system, Ohio, USA, which provided a range of riparian land cover, nearshore vegetation types and habitat complexity. We also estimated the trophic position (TP) of Tetragnathidae and the proportion of energetic and nutritional subsidies derived from benthic algae (EBA) using naturally abundant carbon (C) and nitrogen (N) stable isotopes. Model-selection results revealed that tetragnathid spider density (1.57–3.80individualsm–1) was more sensitive to differences in overhanging vegetation than to those in aquatic food resources (i.e. emergent aquatic insects). Tetragnathidae TP, which averaged 3.16 across all 12 study reaches (range: 2.35–3.98), was largely driven by canopy density, shoreline shape, percentage overhanging vegetation and emergent-insect density. Emergent-insect density was the strongest driver of tetragnathid spider EBA (0.04–0.54, µ=0.24). Our study reinforced the notion that riparian spiders ecologically link aquatic and terrestrial ecosystems. In particular, our results further current understanding of the mechanisms affecting riparian spider distribution and trophic dynamics, particularly in the context of larger stream and river systems, given that the propensity of related research has occurred in small streams.

Exceptional color preferences for flying adult aquatic insects

2021 ◽  
Author(s):  
Junjiro N. Negishi ◽  
Tomohiro Nakagawa ◽  
Futoshi Nakamura
Keyword(s):  
Aquatic Insects ◽  
Color Preferences ◽  
Adult Aquatic Insects

scholarly journals Stable isotope ratios of emergent adult aquatic insects can be used as indicators of water pollution in the hyporheic food web

2020 ◽  
Vol 118 ◽  
pp. 106738
Author(s):  
Md. Khorshed Alam ◽  
Junjiro N. Negishi ◽  
Mirza A.T.M. Tanvir Rahman ◽  
Janine Rodulfo Tolod
Keyword(s):  
Water Pollution ◽  
Stable Isotope ◽  
Food Web ◽  
Aquatic Insects ◽  
Isotope Ratios ◽  
Stable Isotope Ratios ◽  
Adult Aquatic Insects

The fire pulse: wildfire stimulates flux of aquatic prey to terrestrial habitats driving increases in riparian consumers

2010 ◽  
Vol 67 (3) ◽  
pp. 570-579 ◽  
Author(s):  
Rachel L. Malison ◽  
Colden V. Baxter
Keyword(s):  
Benthic Invertebrates ◽  
Aquatic Insects ◽  
Riparian Vegetation ◽  
Aquatic Insect ◽  
Dry Mass ◽  
High Severity ◽  
Aquatic Insect Emergence ◽  
Terrestrial Habitats ◽  
Aquatic Productivity ◽  
Adult Aquatic Insects

We investigated the midterm effects of wildfire (in this case, five years after the fire) of varying severity on periphyton, benthic invertebrates, emerging adult aquatic insects, spiders, and bats by comparing unburned sites with those exposed to low severity (riparian vegetation burned but canopy intact) and high severity (canopy completely removed) wildfire. We observed no difference in periphyton chlorophyll a or ash-free dry mass among different burn categories but did observe significantly greater biomass of benthic invertebrates in both high severity burned and unburned reaches versus low severity burned reaches. Moreover, a significantly greater flux of adult aquatic insect emergence occurred at sites that experienced high severity fire versus low severity burned and unburned sites. The greatest number of spiders and bat echolocation calls were also observed at sites of high severity fire. Our results suggest that fires of different severity may have very different affects on stream-riparian food webs and that high severity wildfire may lead to an extended “fire pulse” that stimulates aquatic productivity and flux of prey to terrestrial habitats, driving local increases in riparian consumers.

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