Growth and development of captive-reared Mercury Islands tusked weta,<i>Motuweta isolata</i>Johns (Orthoptera: Anostostomatidae)

Stringer, Ian; Mack, Hamish J; Grant, Elizabeth; Winks, C. J.

doi:10.1080/00779962.2006.9722136

Cited by 9 publications

(6 citation statements)

References 16 publications

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“…These differences could have refl ected the relative abundance of various types of vegetation between sites but we do not have relevant vegetation data to make the analysis. Ramsay (1955Ramsay ( , 1964, Richards (1973), Moller (1978), Meads & Moller (1978), Barrett & Ramsay (1991), Sherley & Hayes (1993), Richards (1994) and Stringer et al (2006) reported weta with damaged appendages similar to that seen in D. rugosa during the present study. The incidence of damage observed in the present study is within the ranges reported for other weta in the fi eld (respectively for males and females 2.5% and 3.4% in Deinacrida mahoenui (Richards 1994), and 12-17% and 23-42% in Hemideina crassidens on Arapawa Island and Stephens Island (Moller 1978(Moller , 1985.…”

Section: Habitat Usesupporting

confidence: 76%

Morphometric change, distribution, and habitat use of Cook Strait giant weta (Deinacrida rugosa: Orthoptera: Anastostomatidae) after translocation to Matiu-Somes Island

Watts¹,

Stinger²,

Thornburrow³

et al. 2009

New Zealand Entomologist

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Section: Habitat Usesupporting

confidence: 76%

Morphometric change, distribution, and habitat use of Cook Strait giant weta (Deinacrida rugosa: Orthoptera: Anastostomatidae) after translocation to Matiu-Somes Island

Watts¹,

Stinger²,

Thornburrow³

et al. 2009

New Zealand Entomologist

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“…In H. crassidens , large headed males with elongated mandibles engage in combat to defend cavities with female harems in a polygynandrous mating system [35,36]. The heads of the two sexes are completely indistinguishable prior to the 5 th instar, and most dimorphic mandibular development occurs in late instar males immediately prior to sexual maturity, consistent with other Orthopterans [37,38]. It is thus possible that late sub-adult and adult males could have specific nutrient needs based either on the cost of developing or maintaining large mandibles, or costs associated with male-male combat.…”

Section: Introductionmentioning

confidence: 64%

Tolerance for Nutrient Imbalance in an Intermittently Feeding Herbivorous Cricket, the Wellington Tree Weta

2013

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Organisms that regulate nutrient intake have an advantage over those that do not, given that the nutrient composition of any one resource rarely matches optimal nutrient requirements. We used nutritional geometry to model protein and carbohydrate intake and identify an intake target for a sexually dimorphic species, the Wellington tree weta (Hemideina crassidens). Despite pronounced sexual dimorphism in this large generalist herbivorous insect, intake targets did not differ by sex. In a series of laboratory experiments, we then investigated whether tree weta demonstrate compensatory responses for enforced periods of imbalanced nutrient intake. Weta pre-fed high or low carbohydrate: protein diets showed large variation in compensatory nutrient intake over short (<48 h) time periods when provided with a choice. Individuals did not strongly defend nutrient targets, although there was some evidence for weak regulation. Many weta tended to select high and low protein foods in a ratio similar to their previously identified nutrient optimum. These results suggest that weta have a wide tolerance to nutritional imbalance, and that the time scale of weta nutrient balancing could lie outside of the short time span tested here. A wide tolerance to imbalance is consistent with the intermittent feeding displayed in the wild by weta and may be important in understanding weta foraging patterns in New Zealand forests.

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“…New Zealand weta use elaborate cuticular stridulatory structures to produce acoustic signals, most commonly for defense but also in intraspecific signalling 6–10 . Amongst New Zealand weta, large tympanal hearing organs which detect airborne sound have developed in the foreleg tibia of tree weta ( Hemideina , 8 spp.)…”

Section: Introductionmentioning

confidence: 99%

“…Different groups of orthopteran insects, including grasshoppers (Caelifera), crickets, tettigoniids and weta (Ensifera), have evolved diverse and complex signalling systems based on the production and reception of sound or substrate vibration 1 – 5 . New Zealand weta use elaborate cuticular stridulatory structures to produce acoustic signals, most commonly for defense but also in intraspecific signalling 6 – 10 . Amongst New Zealand weta, large tympanal hearing organs which detect airborne sound have developed in the foreleg tibia of tree weta ( Hemideina , 8 spp.)…”

Section: Introductionmentioning

confidence: 99%

The complex tibial organ of the New Zealand ground weta: sensory adaptations for vibrational signal detection

Strauß

Lomas

Field

2017

Sci Rep

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In orthopteran insects, a complex tibial organ has evolved to detect substrate vibrations and/or airborne sound. Species of New Zealand weta (Anostostomatidae) with tympanal ears on the foreleg tibia use this organ to communicate by sound, while in atympanate species (which communicate by substrate drumming) the organ is unstudied. We investigated the complex tibial organ of the atympanate ground weta, Hemiandrus pallitarsis, for vibration detection adaptations. This system contains four sensory components (subgenual organ, intermediate organ, crista acustica homolog, accessory organ) in all legs, together with up to 90 scolopidial sensilla. Microcomputed tomography shows that the subgenual organ spans the hemolymph channel, with attachments suggesting that hemolymph oscillations displace the organ in a hinged-plate fashion. Subgenual sensilla are likely excited by substrate oscillations transmitted within the leg. Instead of the usual suspension within the middle of the tibial cavity, we show that the intermediate organ and crista acustica homolog comprise a cellular mass broadly attached to the anterior tibial wall. They likely detect cuticular vibrations, and not airborne sound. This atympanate complex tibial organ shows elaborate structural changes suggesting detection of vibrational stimuli by parallel input pathways, thus correlating well with the burrowing lifestyle and communication by substrate-transmitted vibration.

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Growth and development of captive-reared Mercury Islands tusked weta,Motuweta isolataJohns (Orthoptera: Anostostomatidae)

Cited by 9 publications

References 16 publications

Morphometric change, distribution, and habitat use of Cook Strait giant weta (Deinacrida rugosa: Orthoptera: Anastostomatidae) after translocation to Matiu-Somes Island

Morphometric change, distribution, and habitat use of Cook Strait giant weta (Deinacrida rugosa: Orthoptera: Anastostomatidae) after translocation to Matiu-Somes Island

Tolerance for Nutrient Imbalance in an Intermittently Feeding Herbivorous Cricket, the Wellington Tree Weta

The complex tibial organ of the New Zealand ground weta: sensory adaptations for vibrational signal detection

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