Aquatic beetles influence colonization of disparate taxa in small lentic systems

Abstract.—The nonnative Northern Snakehead Channa argus was first documented in the Potomac River system in 2004. Since then, their range in Virginia has expanded to include other rivers and numerous lakes as a result of dispersal and illegal introductions. Most Northern Snakehead lake populations were discovered after 2012. Through 2017, nearly 4,000 Northern Snakehead were collected via Virginia Department of Game and Inland Fisheries (VDGIF) electrofishing surveys, resulting in a robust dataset. These collections provided an opportunity to investigate food habits of Northern Snakehead in both lotic and lentic systems which may assist with management and a better understanding of potential community effects. Incidence of identifiable prey items (n = 677) was evaluated since 2004, however wet weights (n = 370) were not recorded until 2014. A total of 30 prey types were identified from Northern Snakehead stomachs taken from rivers, whereas 7 prey types were identified from lakes. Banded Killifish, Bluegill, and crayfish were the most abundant prey types (in order) based on frequency of occurrence for Northern Snakehead collected from rivers; whereas Bluegill, frogs, and Yellow Perch were most common in Northern Snakehead collected from lakes. Most important food types (in order) based on % wet weight for Northern Snakehead collected from rivers were Bluegill, Gizzard Shad, and Banded Killifish; whereas Bluegill, Yellow Perch, and frogs contributed the most mass for Northern Snakehead from lakes.

Selenium Interactions with Algae: Chemical Processes at Biological Uptake Sites, Bioaccumulation, and Intracellular Metabolism

Plants ◽

10.3390/plants9040528 ◽

2020 ◽

Vol 9 (4) ◽

pp. 528 ◽

Cited By ~ 2

Author(s):

Dominic E. Ponton ◽

Stephanie D. Graves ◽

Claude Fortin ◽

David Janz ◽

Marc Amyot ◽

...

Keyword(s):

Food Webs ◽

Mechanistic Model ◽

Trophic Levels ◽

Primary Producers ◽

Organic Selenium ◽

Selenium Uptake ◽

Aquatic Food Webs ◽

Uptake Sites ◽

Aquatic Food ◽

Lentic Systems

Selenium (Se) uptake by primary producers is the most variable and important step in determining Se concentrations at higher trophic levels in aquatic food webs. We gathered data available about the Se bioaccumulation at the base of aquatic food webs and analyzed its relationship with Se concentrations in water. This important dataset was separated into lotic and lentic systems to provide a reliable model to estimate Se in primary producers from aqueous exposure. We observed that lentic systems had higher organic selenium and selenite concentrations than in lotic systems and selenate concentrations were higher in lotic environments. Selenium uptake by algae is mostly driven by Se concentrations, speciation and competition with other anions, and is as well influenced by pH. Based on Se species uptake by algae in the laboratory, we proposed an accurate mechanistic model of competition between sulfate and inorganic Se species at algal uptake sites. Intracellular Se transformations and incorporation into selenoproteins as well as the mechanisms through which Se can induce toxicity in algae has also been reviewed. We provided a new tool for risk assessment strategies to better predict accumulation in primary consumers and consequently to higher trophic levels, and we identified some research needs that could fill knowledge gaps.

The genus Cylloepus Erichson, 1847 (Coleoptera: Elmidae: Elminae) new species and combinations

Zootaxa ◽

10.11646/zootaxa.4652.1.3 ◽

2019 ◽

Vol 4652 (1) ◽

pp. 93-100

Author(s):

THIAGO T. S. POLIZEI ◽

MAXWELL V. L. BARCLAY

Keyword(s):

New Species ◽

External Morphology ◽

New Combinations ◽

International Reference ◽

Diverse Families ◽

Aquatic Beetles ◽

Two New Species

Elmidae is one of the most diverse families of aquatic beetles, with more than 1500 species in 148 genera. Cylloepus is the genus with the most species in Americas, with 52 species and 2 subspecies currently known. The genus is easily recognised by external morphology; body elongate, pronotum with a longitudinal impression on the disc and elytra striate and punctate. In this paper, based on the study of several international reference collections, we propose two new combinations, and describe two new species of Cylloepus (C. bispoi sp. nov. and C. segurae sp. nov.) from Ecuador and Bolivia.

On the genus Berosus Leach (Coleoptera: Hydrophilidae) in the State of Roraima, Brazil: description of three new species and new records

Zootaxa ◽

10.11646/zootaxa.4700.4.3 ◽

2019 ◽

Vol 4700 (4) ◽

pp. 445-463 ◽

Cited By ~ 1

Author(s):

LARISSA SANTANA ◽

CESAR JOÃO BENETTI ◽

BRUNO CLARKSON ◽

ANA MARIA PES

Keyword(s):

New Species ◽

New Records ◽

Neotropical Region ◽

The State ◽

Aquatic Beetles ◽

Northern Brazil ◽

Three New Species ◽

First Time

As a contribution to knowledge of the aquatic beetles of the Neotropical Region, the genus Berosus Leach is recorded for the first time from Roraima State in northern Brazil. Three new species are described and illustrated: Berosus illuviosus sp. n., B. parvus sp. n., and B. andreazzei sp. n. In addition, we present a checklist of the Berosus species collected in 26 ponds in the savanna area of the State of Roraima, with 12 new species records for the state, five of which are also new country records for Brazil.

Context-dependent colonization dynamics: Regional reward contagion drives local compression in aquatic beetles

Journal of Animal Ecology ◽

10.1111/1365-2656.12697 ◽

2017 ◽

Vol 86 (5) ◽

pp. 1124-1135 ◽

Cited By ~ 9

Author(s):

Matthew R. Pintar ◽

William J. Resetarits

Keyword(s):

Aquatic Beetles ◽

Colonization Dynamics ◽

Context Dependent

Aquatic beetles Cercyon unipunctatus as bioindicators of pollution in Lake Edku and Mariut, Egypt

Environmental Science and Pollution Research ◽

10.1007/s11356-018-4016-5 ◽

2019 ◽

Vol 26 (7) ◽

pp. 6557-6564 ◽

Cited By ~ 1

Author(s):

Lamia M. El-Samad ◽

Eman H. Radwan ◽

El Hassan Moustafa Mokhamer ◽

Nahed R. Bakr

Keyword(s):

Aquatic Beetles ◽

Lake Edku

Determining Sexual Dimorphism of Living Aquatic Beetles, Stygoparnus comalensis (Coleoptera: Dryopidae) and Heterelmis comalensis (Coleoptera: Elmidae), Using Internal Abdominal Structures

Journal of Insect Science ◽

10.1093/jisesa/iez075 ◽

2019 ◽

Vol 19 (4) ◽

Author(s):

Ely Kosnicki

Keyword(s):

United States ◽

Sexual Dimorphism ◽

The United States ◽

Sexually Dimorphic ◽

Edwards Aquifer ◽

Aquatic Beetles ◽

Fish And Wildlife Service

Abstract The Comal Springs dryopid beetle, Stygoparnus comalensis Barr and Spangler, and the Comal Springs riffle beetle, Heterelmis comalensis Bosse, Tuff, and Brown, are protected by the United States Fish and Wildlife Service (USFWS), and the development of a captive self-propagating refuge is of importance to stakeholders within the Edwards Aquifer. Being able to reliably distinguish the sex of living subjects is desirable for establishing a successful refuge program. Ventrite, elytron, and pronotum measurements of S. comalensis were taken to determine if there were sexually dimorphic allometries. Various lighting techniques were also implemented to see if there were other characters that could potentially be used to distinguish females and males. Measurements were not found to satisfactorily separate sexes; however, lateral lighting was found to consistently illuminate internal abdominal structures of S. comalensis where sternite 8 was viewable in males and the fused gonocoxites were viewable in females. Lateral lighting was used to examine living specimens of H. comalensis, and it was found that sternite 8 could be viewed in both sexes where the anterior strut of females was much longer and discernible from the anterior strut of males. Commentary regarding the use of cameras and photography for observing living subjects is given.

REGIONAL MELANISM IN AQUATIC BEETLES

Evolution ◽

10.1111/j.1558-5646.1960.tb03089.x ◽

1960 ◽

Vol 14 (3) ◽

pp. 277-283 ◽

Cited By ~ 3

Author(s):

Frank N. Young

Keyword(s):

Aquatic Beetles