Worldwide, parthenogenetic reproduction has evolved many times in the stick insects (Phasmatidae). Many parthenogenetic stick insects show the distribution pattern known as geographic parthenogenesis, in that they occupy habitats that are at higher altitude or latitude compared with their sexual relatives. Although it is often assumed that, in the short term, parthenogenetic populations will have a reproductive advantage over sexual populations; this is not necessarily the case. We present data on the distribution and evolutionary relationships of sexual and asexual populations of the New Zealand stick insect, Clitarchus hookeri. Males are common in the northern half of the species' range but rare or absent elsewhere, and we found that most C. hookeri from putative-parthenogenetic populations share a common ancestor. Female stick insects from bisexual populations of Clitarchus hookeri are capable of parthenogenetic reproduction, but those insects from putative-parthenogenetic populations produced few offspring via sexual reproduction when males were available. We found similar fertility (hatching success) in mated and virgin females. Mated females produce equal numbers of male and female offspring, with most hatching about 9-16 weeks after laying. In contrast, most eggs from unmated females took longer to hatch (21-23 weeks), and most offspring were female. It appears that all C. hookeri females are capable of parthenogenetic reproduction, and thus could benefit from the numerical advantage this yields. Nevertheless, our phylogeographic evidence shows that the majority of all-female populations over a wide geographic area originate from a single loss of sexual reproduction.

PurposeThis study summarises the results of a cognitive‐behavioural treatment group for sexual offenders (n=14) with intellectual limitations in the community.Design/methodology/approachAll participants were convicted sex offenders serving probation orders or prison licences who attended a 14‐month treatment programme designed for sex offenders with intellectual limitations. The programme comprised of five main components: sex education; cognitive distortions; offending cycle; victim empathy; and relapse prevention. All participants completed psychometric measures specifically designed for people with intellectual limitations before and immediately after completing the treatment programme. The four core measures include: Victim Empathy; Sexual Attitudes and Knowledge Assessment (SAK); Questionnaire on Attitudes Consistent with Sexual Offenders (QACSO); and Sex Offences Self‐Appraisal Scale (SOSAS).FindingsPost assessment results reveal significant improvements in sexual offence related attitudes; reductions in attitudes relating to cognitive distortions and pro‐sexual assault beliefs; and significant improvements in victim empathy.Research limitations/implicationsAlthough none of the participants have been reconvicted for committing new sexual offences during the follow‐up period, given that the follow‐up was restricted to 12 months post‐treatment, it is not possible to conclude this intervention was successful in reducing risk of sexual recidivism.Originality/valueThe results from this study support the use of cognitive‐behavioural approaches in demonstrating positive cognitive shift (reconstructing cognitive distortions and attitudes to victim empathy) for sexual offenders with intellectual limitations.

This study offers a critical review of a treatment group for sexual offenders with learning disabilities. The participants were diverted from criminal proceedings due to their level of cognitive functioning and attended a 7-month treatment program comprising of four main components: sex education, cognitive distortions, offending cycle, and relapse prevention. A number of psychometric assessments were administered immediately before and after intervention. Although no significant differences were found in attitudes toward sexual offending following treatment, the trend was for improvements in sex knowledge and honesty of sexual interest. Improvements in socialization skills (leisure time and interpersonal skills) were significant. No further incidents of sexual offending have been reported during a 12-month follow-up. A number of explanations for the nonsignificant improvement in attitudes are considered and recommendations for future treatment evaluation studies are made. The development of specific questionnaires and treatment programs for sexual offenders with learning disabilities is discussed.

Cognitive-behavioral treatment has emerged as the principle type of sex offender treatment targeting deviant arousal, increasing appropriate sexual desires, modifying distorted thinking, and improving interpersonal coping skills. However, treatment effectiveness in reducing sexual offence recidivism continues to be questioned. This is despite the fact that since 1995, five meta-analytical studies have claimed positive treatment effects in reducing sexual offence recidivism. However, many treatment studies have been criticized for weaknesses in their methodologies. In addition, methodological differences between studies make it difficult to determine treatment efficacy. This review found that since 1995, 19 treatment studies have been published, and a third of the 18 studies demonstrating positive treatment effects used sound methodological techniques. Additional treatment studies are needed that utilize sound methodological principles to establish the most effective way of reducing sexual reoffending.

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The results from this study support the use of self-report inventories in assessing differences between offender groups. Such information may assist clinicians in prioritizing management and intervention strategies for those offenders, and in turn lower the risk of further offending.

Animals use adhesive secretions in a plethora of ways, either for attachment, egg anchorage, mating or as either active or passive defence. The most interesting function, however, is the use of adhesive threads to capture prey, as the bonding must be performed within milliseconds and under unsuitable conditions (movement of prey, variable environmental conditions, unfavourable attack angle, etc.) to be nonetheless successful. In the following study a detailed characterization of the prey capture system of the world-renowned glowworm group Arachnocampa from the macroscopic to the ultrastructural level is performed. The data reveal that the adhesive droplets consist mostly of water and display hygroscopic properties at varying humidity levels. The droplet core of Arachnocampa luminosa includes a certain amount of the elements sodium, sulphur and potassium (beside carbon, oxygen and nitrogen), while a different element composition is found in the two related species A. richardsae and A. tasmaniensis. Evidence for lipids, carbohydrates and proteins was negative on the histochemical level, however X-ray photoelectron spectroscopy confirm the presence of peptides within the droplet content. Different to earlier assumptions, the present study indicates that rather than oxalic acid, urea or uric acid are present in the adhesive droplets, presumably originating from the gut. Comparing the capture system in Arachnocampa with those of orb-spiders, large differences appear not only regarding the silky threads, but also, in the composition, hygroscopic properties and size of the mucous droplets.

Abstract. The hypothesis that bioluminescence produced by larvae of the New Zealand glow‐worm, Arachnocampa luminosa, attracts prey was tested experimentally in Reserve Cave, Waitomo, New Zealand, and in its bush‐clad entrance over a total of 200 days during winter, spring, and summer. We compared catches on transparent adhesive traps placed either over glowworms or over areas from which glowworms had been removed. Adhesive traps over glowworms caught significantly more invertebrates per trap per day than did control traps. Glowworms in bush attracted greater numbers and types of invertebrates than did glowworms in the cave. Diptera predominated in both bush (86% of the total catch) and cave (89%). Also caught were small numbers of Araneae, Coleoptera, Hymenoptera, Orthoptera, Trichoptera, Gastropoda, Acarina, and Neuroptera—listed in order of abundance—but no adults of A. luminosa were caught. Glowworms under adhesive traps survived with little or no food for up to 78 days.