scholarly journals Why Do Male Tree Weta Aggressively Evict Females from Galleries After Mating?

Ethology ◽  
2008 ◽  
Vol 114 (2) ◽  
pp. 203-208 ◽  
Author(s):  
Clint D. Kelly
Keyword(s):  
Male Tree ◽  
Tree Weta

scholarly journals Ecology and Development in an Island Population of Wellington Tree Weta (Hemideina crassidens).

2021 ◽  
Author(s):  
◽  
Alexander Dixson
Keyword(s):  
Nutritional Ecology ◽  
Adult Longevity ◽  
Seasonal Patterns ◽  
Island Population ◽  
Factors Affecting ◽  
Treatment Groups ◽  
The Past ◽  
Male Tree ◽  
Hemideina Crassidens ◽  
Tree Weta

<p>Sexual selection and the mating system of the Wellington tree weta has been extensively studied during the last 15 years. In the past 10 years, nutritional ecology and factors affecting the distribution of species in the genus Hemideina have also been examined in great detail. This recent work and the extensive studies of New Zealand tree weta species that preceded it provide much context and comparison for this thesis, which examines the ecology of a population of tree weta living on Matiu/Somes Island. Less is known about factors affecting the development of the exaggerated male weaponry that is characteristic of much of the genus Hemideina.   This thesis firstly presents a mark-recapture study conducted over 42 months on Matiu/Somes Island to obtain ecological information about the population. Secondly, this thesis presents an experiment on the effects of protein supplement on growth and weaponry in male Wellington tree weta derived from the Matiu/Somes Island population. The results of the field study indicate that male tree weta live longer than females on Matiu/Somes Island and weapon size is positively related to adult longevity of males. Seasonal patterns shown in the population on Matiu/Somes Island and inferences about aspects of their life cycle are discussed. Female tree weta on Matiu/Somes Island formed harems throughout each year and there was a positive relationship between males weapon size and the number of females in a harem. Results do not indicate seasonal differences in harem-forming behaviours of females. The results of the captive rearing study include a shorter development time and larger weaponry as adults in males raised on a protein supplemented diet, compared to individuals raised on an entirely herbivorous diet. Details of differences in the course of development are also discussed for the two diet treatment groups.</p>

Ecology and Development in an Island Population of Wellington Tree Weta (Hemideina crassidens).

2021 ◽  
Author(s):  
◽  
Alexander Dixson
Keyword(s):  
Nutritional Ecology ◽  
Adult Longevity ◽  
Seasonal Patterns ◽  
Island Population ◽  
Factors Affecting ◽  
Treatment Groups ◽  
The Past ◽  
Male Tree ◽  
Hemideina Crassidens ◽  
Tree Weta

<p>Sexual selection and the mating system of the Wellington tree weta has been extensively studied during the last 15 years. In the past 10 years, nutritional ecology and factors affecting the distribution of species in the genus Hemideina have also been examined in great detail. This recent work and the extensive studies of New Zealand tree weta species that preceded it provide much context and comparison for this thesis, which examines the ecology of a population of tree weta living on Matiu/Somes Island. Less is known about factors affecting the development of the exaggerated male weaponry that is characteristic of much of the genus Hemideina.   This thesis firstly presents a mark-recapture study conducted over 42 months on Matiu/Somes Island to obtain ecological information about the population. Secondly, this thesis presents an experiment on the effects of protein supplement on growth and weaponry in male Wellington tree weta derived from the Matiu/Somes Island population. The results of the field study indicate that male tree weta live longer than females on Matiu/Somes Island and weapon size is positively related to adult longevity of males. Seasonal patterns shown in the population on Matiu/Somes Island and inferences about aspects of their life cycle are discussed. Female tree weta on Matiu/Somes Island formed harems throughout each year and there was a positive relationship between males weapon size and the number of females in a harem. Results do not indicate seasonal differences in harem-forming behaviours of females. The results of the captive rearing study include a shorter development time and larger weaponry as adults in males raised on a protein supplemented diet, compared to individuals raised on an entirely herbivorous diet. Details of differences in the course of development are also discussed for the two diet treatment groups.</p>

Male tree weta are attracted to cuticular scent cues but do not discriminate according to sex or among two closely related species

Ethology ◽  
2017 ◽  
Vol 123 (11) ◽  
pp. 825-834 ◽  
Author(s):  
Priscilla M. Wehi ◽  
Adrian Monks ◽  
Mary Morgan-Richards
Keyword(s):  
Related Species ◽  
Closely Related Species ◽  
Male Tree ◽  
Tree Weta

scholarly journals Inbreeding Depression in the Full-sib Offspring of Populus nigra L.

2008 ◽  
Vol 57 (1-6) ◽  
pp. 202-210 ◽  
Author(s):  
V. Benetka ◽  
M. Pospíšková ◽  
F. Vrátný ◽  
M. Tkaczyková
Keyword(s):  
Inbreeding Depression ◽  
Microsatellite Loci ◽  
Growth Traits ◽  
Populus Nigra ◽  
Height Increment ◽  
Open Pollination ◽  
Trunk Diameter ◽  
Controlled Pollination ◽  
Male Tree ◽  
Three Sisters

Abstract Controlled pollination was carried out in the species Populus nigra L. in a greenhouse on isolated branches between sisters and a brother - inbreeding (S x B). Female trees (sisters) were also exposed to open pollination (OP) in the neighbourhood of a male tree (brother) and other Populus nigra trees in the vicinity. The analysis of 11 microsatellites was done in the offspring from the inbreeding (S x B) and from the OP. In OP offspring was found 20-76% of viable individuals that were coming from pollination with brother’s pollen (spontaneous inbreeding). These individuals were separated from the offspring. In a randomised field trial the offspring were evaluated for two years. Fitness decreased in S x B offspring, traits of plant height, trunk diameter, height increment and resistance to Melampsora larici-populina Kleb. were lower in comparison with those of OP offspring. A coefficient of inbreeding depression (δ) ranged from 0.373 to 0.034. The significance of differences between the offspring from S x B and OP of the particular sisters was proved. About 30% of homozygous microsatellite loci were identified in inbred S x B offspring, which was more than in OP offspring. This difference was significant in the offspring of three sisters; it was not significant in the offspring of one sister. This trend corresponded to the results of growth traits.

Persisting in a glaciated landscape: Pleistocene microrefugia evidenced by the tree wētā Hemideina maori in central South Island, New Zealand

2020 ◽  
Vol 47 (11) ◽  
pp. 2518-2531
Author(s):  
Keith J. King ◽  
Debbie M. Lewis ◽  
Jonathan M. Waters ◽  
Graham P. Wallis
Keyword(s):  
New Zealand ◽  
Tree Weta ◽  
Central South

scholarly journals Chemical Compounds from the Preanal Gland Secretions of the Male Tree Agama (Acanthocercus atricollis) (Fam. Agamidae)

2013 ◽  
Vol 68 (5-6) ◽  
pp. 253-258
Author(s):  
José Martín ◽  
Jesús Ortega ◽  
Pilar López
Keyword(s):  
Fatty Acids ◽  
Mass Spectra ◽  
Chemical Compounds ◽  
Reproductive Behaviour ◽  
Sexual Signals ◽  
Lizard Species ◽  
Lipophilic Compounds ◽  
Male Tree ◽  
Octadecenoic Acids ◽  
Minor Compounds

Chemical signals have an important role in the reproductive behaviour of many lizards. However, the compounds secreted by their femoral or preanal glands, which may be used as sexual signals, are mainly known for lizard species within the Scleroglossa clade, whereas compounds in secretions of lizards within the Iguania clade are much less studied. Based on mass spectra, obtained by GC-MS, we found 60 lipophilic compounds in preanal gland secretions of the male tree agama (Acanthocercus atricollis) (fam. Agamidae), including steroids (mainly cholesterol, cholest-3-ene, and some of their derivatives), fatty acids ranging between n-C12 and n-C18 (mainly hexadecanoic and octadecenoic acids), ketones from n-C17 to n-C25, and other minor compounds, such as tocopherol, squalene, waxy esters, and furanones. We compare the compounds found with those present in other lizard species and discuss their potential function in social behaviour

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