Organization of the Hox gene cluster in the grasshopper, Schistocerca gregaria

The conserved organization of the Hox genes throughout the animal kingdom has become one of the major paradigms of evolutionary developmental biology. We have examined the organization of the Hox genes of the grasshopper, Schistocerca gregaria. We find that the grasshopper Hox cluster is over 700 kb long, and is not split into equivalents of the Antennapedia complex and the bithorax complex of Drosophila melanogaster. SgDax and probably also Sgzen, the grasshopper homologues of fushi-tarazu (ftz) and Zerknüllt (zen), respectively, are also in the cluster, showing that the non-homeotic Antp-class genes, “accessory genes,” are an ancient feature of insect Hox clusters.

Grasshopper crop and midgut extract effects on plants: an example of reward feedback.

Acid extracts and a resultant fraction from solid-phase extraction (SPE) of Romalea guttata crop and midgut tissues induce sorghum (Sorghum bicolor var. Rio) coleoptile growth in 24-h incubations an average of 49% above untreated controls. When combined with plant auxin, indole-3-acetic acid (IAA), the SPE fraction shows a synergistic reaction, yielding increases in coleoptile growth that average 295% above untreated controls and 8% above IAA standards. The interaction lowered the point of maximum sensitivity of IAA 3 orders of magnitude, resulting in a new IAA physiological set point at 10(-7) g/ml. This synergism suggests that contents in animal regurgitants making their way into plant tissue during feeding may produce a positive feedback in plant growth and development following herbivory. Such a process, also known as reward feedback, may exert major controls on ecosystem-level relationships in nature.

Chemical diversity and potential biological functions of the pygidial gland secretions in two species of Neotropical dung roller beetles

Dung roller beetles of the genus Canthon (Coleoptera: Scarabaeinae) emit an odorous secretion from a pair of pygidial glands. To investigate the chemical composition of these secretions, we used stir bar sorptive extraction (SBSE), coupled with gas chromatography–mass spectrometry (GC–MS) for analysis of extracts of pygidial gland secretions secreted by the dung roller beetles Canthon femoralis femoralis and Canthon cyanellus cyanellus. Chemical analyses of volatiles collected from pygidial gland secretions comprise a great diversity of the functional groups. Chemical profile comparisons showed high intra- and interspecific variability. The pygidial gland secretion of Canthon f. femoralis was dominated by sesquiterpene hydrocarbons, whereas the profile of Canthon c. cyanellus was dominated by carboxylic acids. The different pygidial secretions have a high diversity of chemical compounds suggesting a multifunctional nature involving some key functions in the biology. We discuss the biological potential of these compounds found in the pygidial glands of each species with respect to their ecological and behavioral relevance.

Neotropical deer (Cervidae) : Part I. Pudus, genus Pudu Gray / Philip Hershkovitz.

n.s. no.11(1982)

Notes on some neotropical hawks [by] Boardman Conover.

v.31:no.5(1946)

Studies in neotropical mammalogy : essays in honor of Philip Hershkovitz / edited by Bruce D. Patterson, Robert M. Timm.

n.s. no.39(1987)

Birds in relation to a grasshopper outbreak in California,

Mode of access: Internet.

Status and management of neotropical migratory birds : September 21-25, 1992, Estes Park Center, YMCA of the Rockies, Colorado /

Proceedings of a National Training Workshop, Status and Management of Neotropical Migratory Birds, held at the Estes Park Center, YMCA of the Rockies, in Estes Park, Colorado, 21-25 September, 1992.

Knee-high to a grasshopper,

Mode of access: Internet.

A study in neotropical Pselaphidae,

Mode of access: Internet.

The life of the grasshopper,

Some of the chapters have already appeared, part under different titles and part in an abbreviated form, in an interesting miscellany extracted from the Souvenirs, translated by Mr. Bernard Miall, under the title of Social life in the insect world. cf. Translator's note.

A synopsis of part of the neotropical crane-flies of the subfamily Limnobina︠e︡.

From: United States. National Museum proceedings. v. 44, p. 481-549. no. 1966.

The abdominal mechanisms of a grasshopper,

Publication 3335.

Grasshopper green and the meadow-mice /

Mode of access: Internet.

Grasshopper integrated pest management handbook.

Title on disk: Hopper.