Orthopteroid insects: A perfect group to investigate ecology, conservation, and biogeography

2016 ◽  
Author(s):  
Paolo Fontana
Keyword(s):  
Perfect Group ◽  
Orthopteroid Insects

Some Results on Semi-Perfect Group Rings

1974 ◽  
Vol 26 (1) ◽  
pp. 121-129 ◽  
Author(s):  
S. M. Woods
Keyword(s):  
Group Ring ◽  
Polynomial Ring ◽  
Strong Interaction ◽  
Sufficient Conditions ◽  
Group Rings ◽  
Commutative Case ◽  
Perfect Group ◽  
Case Examples ◽  
Complete Answer ◽  
Necessary And Sufficient

The aim of this paper is to find necessary and sufficient conditions on a group G and a ring A for the group ring AG to be semi-perfect. A complete answer is given in the commutative case, in terms of the polynomial ring A[X] (Theorem 5.8). In the general case examples are given which indicate a very strong interaction between the properties of A and those of G. Partial answers to the question are given in Theorem 3.2, Proposition 4.2 and Corollary 4.3.

Diversity and distribution of the orthopteroid insects of the Galápagos Islands, Ecuador

1996 ◽  
Vol 74 (8) ◽  
pp. 1497-1510 ◽  
Author(s):  
Stewart B. Peck
Keyword(s):  
Species Richness ◽  
Introduced Species ◽  
Arid Zone ◽  
Galapagos Islands ◽  
Galápagos Islands ◽  
Surface Transport ◽  
Naturally Occurring ◽  
Ecological Complexity ◽  
Tropical America ◽  
Orthopteroid Insects

New fieldwork has brought the entire "orthopteroid" fauna of the Galápagos Islands to a total of 57 species, in 37 genera, and 7 insect orders. Identification keys and distributional details are given for the 24 species in the order Orthoptera (s.str.) (Ensifera and Caelifera). Of these, 19 species (and 2 genera) are endemic, 2 species are native (naturally occurring elsewhere in tropical America), and 3 species are presumed to have been introduced by humans. It is assumed that ancestral natural colonizations occurred through the air by flying ancestors or through rafting and ocean-surface transport by flightless ancestors (in Gryllidae; Nemobiinae and Mogoplistinae). Of the indigenous (non-introduced) species, 71% of Orthoptera (s.str.) and 72% of all orthopteroids of the Galápagos Islands are now flightless in one or both sexes. Considering the richness of the total orthopteroid fauna in mainland Ecuador, the island fauna is very highly impoverished. Evolution and diversification are modest in the Galápagos orthopteroids compared with some other plants and animals. Some species (probably descendant from coastal arid zone ancestors) are now limited to either moist highland or cave habitats. Species richness is significantly positively correlated with island ecological complexity and island area.

THE ORTHOPTEROID INSECTS IN NORTHERN NORTH AMERICA: UPDATING AND RATIONALIZING RECENT WORK

1987 ◽  
Vol 119 (11) ◽  
pp. 1043-1054 ◽  
Author(s):  
V.R. Vickery
Keyword(s):  
North America ◽  
Recent Work ◽  
North American ◽  
Orthopteroid Insects

AbstractA number of recent publications have been produced on North American orthopteroid insects. These publications differ in some respects in dealing with the northern, particularly Canadian, orthopteroid fauna. This paper details the changes in names of taxa at nearly all levels, together with the present accepted names, and explanations and reasons for the changes.

The Orthopteroid insects of Norfolk Island, with descriptions and records of some related species from Lord Howe Island, South Pacific

1988 ◽  
Vol 2 (8) ◽  
pp. 1013 ◽  
Author(s):  
DCF Rentz
Keyword(s):  
National Parks ◽  
Related Species ◽  
Periplaneta Americana ◽  
South East Asia ◽  
Dominant Group ◽  
Lord Howe Island ◽  
Norfolk Island ◽  
Wild Olive ◽  
Orthopteroid Insects ◽  
Orthopteran Species

The Orthoptera and Blattodea of Norfolk I. and adjacent Philip I. are discussed as a result of two recent expeditions sponsored by the Australian National Parks and Wildlife Service and CSIRO. The origins, affinities, taxonomy and ecology of species is presented. Relevant notes and descriptions of related species from Lord Howe I. are also included. Twenty species of Orthoptera are known from Norfolk I. and Philip I. Crickets are the dominant group (10 species) probably because they oviposit in plant tissue which is readily dispersed overseas. Ten orthopteran species have their origins in mainland Australia. Three are definitely of New Caledonian origin; the remainder are from south-east Asia. Fifty-five per cent of species are endemic and 72% of these are flightless. Introduced wild olive on Philip I. is considered important in pro-viding litter and cover in which a number of endemic species survive on this otherwise ecologically devastated landscape. Seven species are described as new: Phisis tardipes, sp. nov.; Austrosalomona personafrons, gen. et sp. nov.; A. zentae (Lord Howe), gen. et sp. nov.; Caedicia gracilis, sp. nov.; C. araucariae, sp. nov.; C. noctivaga, sp. nov.; C. mesochides (Lord Howe), sp. nov. Eight species of Blattodea (cockroaches) are recorded from the islands. Only three are considered native, the others have been introduced through commerce. Evidence is presented suggesting that Periplaneta americana (L.), present on Norfolk but not on Philip, has outcompeted and eliminated a native cricket on Norfolk; the cricket is present and common in similar habitats on Philip I. No new species are described.

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