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Zoological Letters

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https://www.readbyqxmd.com/read/29785282/trabecular-architecture-in-the-sciuromorph-femoral-head-allometry-and-functional-adaptation
#1
Maja Mielke, Jan Wölfer, Patrick Arnold, Anneke H van Heteren, Eli Amson, John A Nyakatura
Background: Sciuromorpha (squirrels and close relatives) are diverse in terms of body size and locomotor behavior. Individual species are specialized to perform climbing, gliding or digging behavior, the latter being the result of multiple independent evolutionary acquisitions. Each lifestyle involves characteristic loading patterns acting on the bones of sciuromorphs. Trabecular bone, as part of the bone inner structure, adapts to such loading patterns. This network of thin bony struts is subject to bone modeling, and therefore reflects habitual loading throughout lifetime...
2018: Zoological Letters
https://www.readbyqxmd.com/read/29780614/pheromone-gland-development-and-monoterpenoid-synthesis-specific-to-oviparous-females-in-the-pea-aphid
#2
Koki Murano, Kota Ogawa, Tomonari Kaji, Toru Miura
Background: Aphids display "cyclic parthenogenesis," in which parthenogenetically and sexually reproducing morphs seasonally alternate in the aphid annual life cycles. There are various characteristics that differ between asexual viviparous and sexual oviparous females. In oviparous females, swollen cuticular structures (~ 10 μm in diameter), called "scent plaques," are scattered on the surface of hind tibias, and secrete monoterpenoid sex pheromones. However, the developmental processes of the pheromone glands and the biosynthetic pathways of monoterpenoid pheromones have yet to be elucidated...
2018: Zoological Letters
https://www.readbyqxmd.com/read/29721334/ectopic-fgf-signaling-induces-the-intercalary-response-in-developing-chicken-limb-buds
#3
Aki Makanae, Akira Satoh
Background: Intercalary pattern formation is an important regulatory step in amphibian limb regeneration. Amphibian limb regeneration is composed of multiple steps, including wounding, blastema formation, and intercalary pattern formation. Attempts have been made to transfer insights from regeneration-competent animals to regeneration-incompetent animalsat each step in the regeneration process. In the present study, we focused on the intercalary mechanism in chick limb buds. In amphibian limb regeneration, a proximodistal axis is organized as soon as a regenerating blastema is induced...
2018: Zoological Letters
https://www.readbyqxmd.com/read/29682316/physical-properties-of-the-tunic-in-the-pinkish-brown-salp-pegea-confoederata-tunicata-thaliacea
#4
Daisuke Sakai, Hiroshi Kakiuchida, Jun Nishikawa, Euichi Hirose
Background: Invisibility in the water column is a crucial strategy for gelatinous zooplanktons in avoiding detection by visual predators, especially for animals distributed in the euphotic zone during the daytime; i.e., surface dwellers that do not undergo diel vertical migration. Salps, a member of the subphylum Tunicata (Urochordata), usually have a transparent body that is entirely covered with a cellulosic matrix, called the tunic. Some non-migrator species are known to exhibit a nano-scale nipple array on the tunic surface...
2018: Zoological Letters
https://www.readbyqxmd.com/read/29484202/fusion-of-piggybac-like-transposons-and-herpesviruses-occurs-frequently-in-teleosts
#5
Yusuke Inoue, Masahiko Kumagai, Xianbo Zhang, Tomonori Saga, Deshou Wang, Akihiko Koga, Hiroyuki Takeda
Background: Endogenous viral elements play important roles in eukaryotic evolution by giving rise to genetic novelties. Herpesviruses are a large family of DNA viruses, most of which do not have the ability to endogenize into host genomes. Recently, we identified a novel type of endogenous herpesvirus, which we named " Teratorn ", from the medaka ( Oryzias latipes ) genome, in which the herpesvirus is fused with a piggyBac -like DNA transposon, forming a novel mobile element...
2018: Zoological Letters
https://www.readbyqxmd.com/read/29468087/development-of-hypobranchial-muscles-with-special-reference-to-the-evolution-of-the-vertebrate-neck
#6
Noritaka Adachi, Juan Pascual-Anaya, Tamami Hirai, Shinnosuke Higuchi, Shigeru Kuratani
Background: The extant vertebrates include cyclostomes (lamprey and hagfish) and crown gnathostomes (jawed vertebrates), but there are various anatomical disparities between these two groups. Conspicuous in the gnathostomes is the neck, which occupies the interfacial domain between the head and trunk, including the occipital part of the cranium, the shoulder girdle, and the cucullaris and hypobranchial muscles (HBMs). Of these, HBMs originate from occipital somites to form the ventral pharyngeal and neck musculature in gnathostomes...
2018: Zoological Letters
https://www.readbyqxmd.com/read/29468086/dna-metabarcoding-of-spiders-insects-and-springtails-for-exploring-potential-linkage-between-above-and-below-ground-food-webs
#7
Hirokazu Toju, Yuki G Baba
Background: Understanding feedback between above- and below-ground processes of biological communities is a key to the effective management of natural and agricultural ecosystems. However, as above- and below-ground food webs are often studied separately, our knowledge of material flow and community dynamics in terrestrial ecosystems remains limited. Results: We developed a high-throughput sequencing method for examining how spiders link above- and below-ground food webs as generalist predators...
2018: Zoological Letters
https://www.readbyqxmd.com/read/29445519/highly-efficient-generation-of-knock-in-transgenic-medaka-by-crispr-cas9-mediated-genome-engineering
#8
Ikuko Watakabe, Hisashi Hashimoto, Yukiko Kimura, Saori Yokoi, Kiyoshi Naruse, Shin-Ichi Higashijima
Background: Medaka ( Oryzias latipes ) is a popular animal model used in vertebrate genetic analysis. Recently, an efficient (~ 30%) knock-in system via non-homologous end joining (NHEJ) was established in zebrafish using the CRISPR/Cas9 system. If the same technique were applicable in medaka, it would greatly expand the usefulness of this model organism. The question of the applicability of CRISPR/Cas9 in medaka, however, has yet to be addressed. Results: We report the highly efficient generation of knock-in transgenic medaka via non-homologous end joining (NHEJ)...
2018: Zoological Letters
https://www.readbyqxmd.com/read/29372073/flight-feather-development-its-early-specialization-during-embryogenesis
#9
Mao Kondo, Tomoe Sekine, Taku Miyakoshi, Keiichi Kitajima, Shiro Egawa, Ryohei Seki, Gembu Abe, Koji Tamura
Background: Flight feathers, a type of feather that is unique to extant/extinct birds and some non-avian dinosaurs, are the most evolutionally advanced type of feather. In general, feather types are formed in the second or later generation of feathers at the first and following molting, and the first molting begins at around two weeks post hatching in chicken. However, it has been stated in some previous reports that the first molting from the natal down feathers to the flight feathers is much earlier than that for other feather types, suggesting that flight feather formation starts as an embryonic event...
2018: Zoological Letters
https://www.readbyqxmd.com/read/29340168/evolution-of-the-vertebrate-neurocranium-problems-of-the-premandibular-domain-and-the-origin-of-the-trabecula
#10
REVIEW
Shigeru Kuratani, Per E Ahlberg
The subdivision of the gnathostome neurocranium into an anterior neural crest-derived moiety and a posterior mesodermal moiety has attracted the interest of researchers for nearly two centuries. We present a synthetic scenario for the evolution of this structure, uniting developmental data from living cyclostomes and gnathostomes with morphological data from fossil stem gnathostomes in a common phylogenetic framework. Ancestrally, vertebrates had an anteroposteriorly short forebrain, and the neurocranium was essentially mesodermal; skeletal structures derived from premandibular ectomesenchyme were mostly anterior to the brain and formed part of the visceral arch skeleton...
2018: Zoological Letters
https://www.readbyqxmd.com/read/29255617/a-sodium-binding-system-alleviates-acute-salt-stress-during-seawater-acclimation-in-eels
#11
Marty Kwok Shing Wong, Takehiro Tsukada, Nobuhiro Ogawa, Supriya Pipil, Haruka Ozaki, Yutaka Suzuki, Wataru Iwasaki, Yoshio Takei
Background: Teleosts transiting from freshwater (FW) to seawater (SW) environments face an immediate osmotic stress from ion influxes and water loss, but some euryhaline species such as eels can maintain a stable plasma osmolality during early SW exposure. The time course changes in the gene expression, protein abundance, and localization of key ion transporters suggested that the reversal of the ion transport systems was gradual, and we investigate how eels utilize a Na-binding strategy to slow down the ion invasion and complement the transporter-mediated osmoregulation...
2017: Zoological Letters
https://www.readbyqxmd.com/read/29214050/paternal-phylogeographic-structure-of-the-brown-bear-ursus-arctos-in-northeastern-asia-and-the-effect-of-male-mediated-gene-flow-to-insular-populations
#12
Daisuke Hirata, Tsutomu Mano, Alexei V Abramov, Gennady F Baryshnikov, Pavel A Kosintsev, Koichi Murata, Ryuichi Masuda
Background: Sex-biased dispersal is widespread among mammals, including the brown bear ( Ursus arctos ). Previous phylogeographic studies of the brown bear based on maternally inherited mitochondrial DNA have shown intraspecific genetic structuring around the northern hemisphere. The brown bears on Hokkaido Island, northern Japan, comprise three distinct maternal lineages that presumably immigrated to the island from the continent in three different periods. Here, we investigate the paternal genetic structure across northeastern Asia and assess the connectivity among and within intraspecific populations in terms of male-mediated gene flow...
2017: Zoological Letters
https://www.readbyqxmd.com/read/29201432/tube-construction-by-a-tanaidacean-crustacean-using-a-novel-mucus-secretion-system-involving-the-anal-opening
#13
Keiichi Kakui, Chizue Hiruta
Background: Animals in diverse aquatic groups construct tubes using mucus and filaments, and the acquisition of this capability has likely played an important role in the evolution and diversification of small benthic animals. Tanaidacea is a crustacean order that includes tube-constructing species, most of which belong to Tanaidoidea and Paratanaoidea, with a few in Kalliapseudidae (Apseudoidea). Two previously reported systems used in tube construction are the thoracic-gland system, with secretory glands in thoracic segments (pereonites), and the pereopodal-gland system, with glands in pereopods...
2017: Zoological Letters
https://www.readbyqxmd.com/read/29075513/morphology-of-brood-pouch-formation-in-the-pot-bellied-seahorse-hippocampus-abdominalis
#14
Mari Kawaguchi, Ryohei Okubo, Akari Harada, Kazuki Miyasaka, Kensuke Takada, Junya Hiroi, Shigeki Yasumasu
BACKGROUND: The reproductive strategies of vertebrates are diverse. Seahorses (Pisces: Syngnathidae) possess the unique characteristic of male pregnancy; i.e., males, not females, incubate embryos in a specialized structure called a 'brood pouch'. The brood pouch is formed along the ventral midline of the tail. The lumen of the brood pouch is surrounded by loose connective tissue, called pseudoplacenta, and dermis. RESULTS: We visualized and evaluated the morphology of brood pouch formation in Hippocampus abdominalis to gain generalizable insights into this process in seahorses...
2017: Zoological Letters
https://www.readbyqxmd.com/read/29075512/rhodopsin-gene-copies-in-japanese-eel-originated-in-a-teleost-specific-genome-duplication
#15
Yoji Nakamura, Motoshige Yasuike, Miyuki Mekuchi, Yuki Iwasaki, Nobuhiko Ojima, Atushi Fujiwara, Seinen Chow, Kenji Saitoh
BACKGROUND: Gene duplication is considered important to increasing the genetic diversity in animals. In fish, visual pigment genes are often independently duplicated, and the evolutionary significance of such duplications has long been of interest. Eels have two rhodopsin genes ( rho ), one of which (freshwater type, fw-rho ) functions in freshwater and the other (deep-sea type, ds-rho ) in marine environments. Hence, switching of rho expression in retinal cells is tightly linked with eels' unique life cycle, in which they migrate from rivers or lakes to the sea...
2017: Zoological Letters
https://www.readbyqxmd.com/read/28932414/hox-gene-cluster-of-the-ascidian-halocynthia-roretzi-reveals-multiple-ancient-steps-of-cluster-disintegration-during-ascidian-evolution
#16
Yuka Sekigami, Takuya Kobayashi, Ai Omi, Koki Nishitsuji, Tetsuro Ikuta, Asao Fujiyama, Noriyuki Satoh, Hidetoshi Saiga
BACKGROUND: Hox gene clusters with at least 13 paralog group (PG) members are common in vertebrate genomes and in that of amphioxus. Ascidians, which belong to the subphylum Tunicata (Urochordata), are phylogenetically positioned between vertebrates and amphioxus, and traditionally divided into two groups: the Pleurogona and the Enterogona. An enterogonan ascidian, Ciona intestinalis (Ci), possesses nine Hox genes localized on two chromosomes; thus, the Hox gene cluster is disintegrated...
2017: Zoological Letters
https://www.readbyqxmd.com/read/28904812/strongest-grip-on-the-rod-tarsal-morphology-and-attachment-of-japanese-pine-sawyer-beetles
#17
Dagmar Voigt, Takuma Takanashi, Kazuko Tsuchihara, Kenichi Yazaki, Katsushi Kuroda, Remi Tsubaki, Naoe Hosoda
No abstract text is available yet for this article.
2017: Zoological Letters
https://www.readbyqxmd.com/read/28879039/the-tymbal-muscle-of-cicada-has-flight-muscle-type-sarcomeric-architecture-and-protein-expression
#18
Hiroyuki Iwamoto
BACKGROUND: The structural and biochemical features of the tymbal (sound-producing) muscle of cicadas were studied by X-ray diffraction and immunochemistry, and compared with those of flight muscles from the same species. RESULTS: The X-ray diffraction pattern of the tymbal muscle was very similar to that of the dorsal longitudinal flight muscle: In both muscles, the 2,0 equatorial reflection is much more intense than the 1,1, indicating that both muscles have a flight muscle-type myofilament lattice...
2017: Zoological Letters
https://www.readbyqxmd.com/read/28861276/red-shift-of-spectral-sensitivity-due-to-screening-pigment-migration-in-the-eyes-of-a-moth-adoxophyes-orana
#19
Aya Satoh, Finlay J Stewart, Hisaharu Koshitaka, Hiroshi D Akashi, Primož Pirih, Yasushi Sato, Kentaro Arikawa
BACKGROUND: We have found that the spectral sensitivity of the compound eye in the summer fruit tortrix moth (Adoxophyes orana) differs in laboratory strains originating from different regions of Japan. We have investigated the mechanisms underlying this anomalous spectral sensitivity. METHODS: We applied electrophysiology, light and electron microscopy, opsin gene cloning, mathematical modeling, and behavioral analysis. RESULTS: The ERG-determined spectral sensitivity of dark-adapted individuals of all strains peaks around 520 nm...
2017: Zoological Letters
https://www.readbyqxmd.com/read/28828177/novel-bacteriocyte-associated-pleomorphic-symbiont-of-the-grain-pest-beetle-rhyzopertha-dominica-coleoptera-bostrichidae
#20
Genta Okude, Ryuichi Koga, Toshinari Hayashi, Yudai Nishide, Xian-Ying Meng, Naruo Nikoh, Akihiro Miyanoshita, Takema Fukatsu
BACKGROUND: The lesser grain borer Rhyzopertha dominica (Coleoptera: Bostrichidae) is a stored-product pest beetle. Early histological studies dating back to 1930s have reported that R. dominica and other bostrichid species possess a pair of oval symbiotic organs, called the bacteriomes, in which the cytoplasm is densely populated by pleomorphic symbiotic bacteria of peculiar rosette-like shape. However, the microbiological nature of the symbiont has remained elusive. RESULTS: Here we investigated the bacterial symbiont of R...
2017: Zoological Letters
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