scholarly journals First records of the diving beetles Hydrovatus subrotundatus Motschulsky, 1859 and Hydrovatus pudicus (Clark, 1863) in Taiwan (Coleoptera, Dytiscidae, Hydroporinae, Hydrovatini)

Check List ◽  
2021 ◽  
Vol 17 (5) ◽  
pp. 1295-1298
Author(s):  
Liang-Jong Wang ◽  
Lars Hendrich ◽  
Michael Balke
Keyword(s):  
Southeast Asia ◽  
Diving Beetles ◽  
Diving Beetle

We provide the first records of the diving beetles Hydrovatus subrotundatus Motschulsky, 1859 and Hydrovatus pudicus (Clark, 1863) from Taiwan. They are otherwise widespread in Southeast Asia. The habitats of both species and the associated diving beetle fauna are briefly described. Altogether eight species of the genus Hydrovatus are now recorded from Taiwan, raising the number of Taiwanese dytiscid species to 68.

Body size and species richness along geographical gradients in Albertan diving beetle (Coleoptera: Dytiscidae) communities

2007 ◽  
Vol 85 (4) ◽  
pp. 443-449 ◽  
Author(s):  
S.M. Vamosi ◽  
C.J. Naydani ◽  
J.C. Vamosi
Keyword(s):  
Species Richness ◽  
Body Size ◽  
High Elevation ◽  
Water Bodies ◽  
Large Species ◽  
Terrestrial Plants ◽  
Diving Beetles ◽  
Species Lists ◽  
Potential Factors ◽  
Diving Beetle

Species richness and body size often vary predictably along latitudinal and elevational gradients. Although these patterns have been well documented for a variety of taxa, the vast majority of studies have focused on terrestrial plants and animals. We used species lists of predaceous diving beetles (Coleoptera: Dytiscidae) collected from >400 lentic water bodies in southern Alberta to investigate the influences of latitude and elevation on species richness and body size. Because our data were based on species lists, we used proportion of, and probability of encountering at least one, large (i.e., mean body length >10 mm) diving beetle species as surrogates for the mean body size of diving beetles in a given water body. Species richness did not change with latitude and displayed a hump-shaped relationship with elevation, peaking at mid-elevations. High elevation (>2000 m) water bodies had markedly low species richness. Proportion of large species increased with latitude, although there was no effect on probability of occupancy by large species. Conversely, both measures tended to decrease with elevation, suggesting that large species are less prevalent at high elevations. We discuss potential factors contributing to the observed responses to latitude and elevation, with an emphasis on the potential impacts of oxygen limitation, productivity, and isolation at high elevation.

scholarly journals Male clasping ability, female polymorphism and sexual conflict: fine-scale elytral morphology as a sexually antagonistic adaptation in female diving beetles

2013 ◽  
Vol 10 (86) ◽  
pp. 20130409 ◽  
Author(s):  
Kristina Karlsson Green ◽  
Alexander Kovalev ◽  
Erik I. Svensson ◽  
Stanislav N. Gorb
Keyword(s):  
Sexual Conflict ◽  
Adhesive Force ◽  
Beetle Species ◽  
Female Polymorphism ◽  
Diving Beetles ◽  
Males And Females ◽  
Suction Cups ◽  
Female Morph ◽  
Diving Beetle ◽  
Sexually Antagonistic Coevolution

During sexual conflict, males and females are expected to evolve traits and behaviours with a sexually antagonistic function. Recently, sexually antagonistic coevolution was proposed to occur between male and female diving beetles (Dytiscidae). Male diving beetles possess numerous suction cups on their forelegs whereas females commonly have rough structures on their elytra. These rough structures have been suggested to obstruct adhesion from male suction cups during mating attempts. However, some diving beetle species are dimorphic, where one female morph has a rough elytra and the other has a smooth elytra. Here, we used biomechanics to study the adhesive performance of male suction cups on the female morphs in two diving beetle species: Dytiscus lapponicus and Graphoderus zonatus . We compared adhesion on the rough and the smooth female morphs to infer the function of the rough elytral modifications. We found that the adhesive force on the rough structures was much lower than on other surfaces. These findings support the suggestion of sexual conflict in diving beetles and a sexually antagonistic function of the rough female structures. In addition, males differed in their adhesive capacity on different female surfaces, indicating a male trade-off between adhering to smooth and rough female morphs.

scholarly journals Observed shifts in the contact zone between two forms of the diving beetleHydroporus memnoniusare consistent with predictions from sexual conflict

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2089 ◽  
Author(s):  
David T. Bilton ◽  
Garth N. Foster
Keyword(s):  
Contact Zone ◽  
Sexual Conflict ◽  
Climatic Warming ◽  
Population Replacement ◽  
Trade Offs ◽  
Diving Beetles ◽  
Using Data ◽  
Cuticular Surface ◽  
Diving Beetle ◽  
Sexually Antagonistic Coevolution

Sexual conflict drives both inter- and intrasexual dimorphisms in many diving beetles, where male persistence and female resistance traits co-evolve in an antagonistic manner. To date most studies have focussed on species where rough and smooth females and their associated males typically co-occur within populations, where phenotype matching between morphs may maintain forms as stable polymorphisms. The Palaearctic diving beetleHydroporus memnoniusis characterised by having dimorphic (rough var.castaneusand smooth, shining) females and associated males which differ in persistence traits; the two forms being largely distributed parapatrically. In this species, instead of mating trade-offs between morphs, males associated withcastaneusfemales should have a mating advantage with both this form and shining females, due to their increased persistence abilities on either cuticular surface. This may be expected to lead to the replacement of the shining form withcastaneusin areas where the two come into contact. Using data collected over a thirty year period, we show that this process of population replacement is indeed occurring,castaneushaving expanded significantly at the expense of the shining female form. Whilst populations of both forms close to the contact zone appear to differ in their thermal physiology, these differences are minor and suggest that the expansion ofcastaneusis not linked to climatic warming in recent decades. Instead we argue that the observed spread ofcastaneusand its associated male may result from the dynamics of sexually antagonistic coevolution in this beetle.

scholarly journals Predaceous diving beetles (Coleoptera: Dytiscidae) from Montenegro with new records and description of the female of Hydroporus Macedonicus Fery & Pesic, 2006

2011 ◽  
Vol 63 (2) ◽  
pp. 477-485 ◽  
Author(s):  
Ana Pavicevic ◽  
V. Pesic
Keyword(s):  
Present State ◽  
New Records ◽  
Beetle Species ◽  
Ecological Characteristics ◽  
Water Beetle ◽  
Diving Beetles ◽  
The Family ◽  
Aquatic Beetle ◽  
First Time ◽  
Diving Beetle

This paper deals with the aquatic beetle species of the family Dytiscidae collected from various freshwaters habitats in Montenegro. In total 39 water beetle species were collected from 56 localities in Montenegro between 2007 and 2010. Twelve species and one subspecies are reported for the first time for Montenegro: Agabus sturmii (Gyllenhal, 1808), A. paludosus (Fabricius, 1801), Deronectes moestus inconspectus (Leprieur, 1876), D. platynotus (Germar, 1834), Dytiscus circumcinctus Ahrens, 1811, D. dimidiatus Bergstr?sser, 1778, Hydroporus macedonicus Fery & Pesic, 2006, H. pubescens (Gyllenhal, 1808), Ilybius chalconatus (Panzer, 1797), I. fuliginosus fuliginosus (Fabricius, 1792), I. pseudoneglectus (Franciscolo, 1972), Liopterus haemorrhoidalis (Fabricius, 1787) and Nebrioporus luctuosus (Aub?, 1838). The female genitalia of Hydroporus macedonicus Fery & Pesic, 2006, a rare water beetle previously known only from southern Macedonia, are illustrated. The present state of knowledge of the Montenegrin diving beetle fauna and its ecological characteristics is discussed.

A rare diving beetle from Baltic amber:Hydrotrupes prometheusnew species reveals former widespread distribution of the genus (Coleoptera, Dytiscidae)

2014 ◽  
Vol 88 (4) ◽  
pp. 814-822 ◽  
Author(s):  
R. Antonio Gómez ◽  
Anders L. Damgaard
Keyword(s):  
New Species ◽  
Eastern China ◽  
Morphological Characters ◽  
Disjunct Distribution ◽  
Single Female ◽  
Widespread Distribution ◽  
Extant Genus ◽  
Diving Beetles ◽  
A New Species ◽  
Diving Beetle

A new species in the extant genus,HydrotrupesSharp,H. prometheusn. sp., (Coleoptera, Dytiscidae) is described from Baltic amber (Eocene) based on examination of a single female specimen. This description represents one of a limited number of diving beetle taxa described from fossiliferous amber and is currently the oldest known fossil assigned to Agabinae. Based on this specimenHydrotrupesis at least 40 million years old. The occurrence ofHydrotrupesduring the Eocene suggests that the current disjunct distribution of livingHydrotrupesspecies occurring in western North America and eastern China is a relict of former widespread distribution in the northern continents. Considering the age of this fossil and its similarity to living members of the genusHydrotrupes, the conservation of morphology in this lineage of diving beetles is notable. Key morphological characters of the new species are illustrated, and the significance of this discovery for understanding Agabinae evolution and the biogeography of this previously hypothesized trans-Beringian lineage is discussed.

On The Possibility of an Autonomous History of Modern Southeast Asia

1961 ◽  
Vol 2 (2) ◽  
pp. 73-105 ◽  
Author(s):  
John R. W. Small
Keyword(s):  
Southeast Asia ◽  
Contemporary History ◽  
The Past ◽  
History Of

It is generally accepted that history is an element of culture and the historian a member of society, thus, in Croce's aphorism, that the only true history is contemporary history. It follows from this that when there occur great changes in the contemporary scene, there must also be great changes in historiography, that the vision not merely of the present but also of the past must change.

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