Zoology Research 
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This page shows you the most recent publications within this specialty of the MedWorm directory. This is page number 31.
Retinoic acid is a key regulatory switch determining the difference between lung and thyroid fates in Xenopus laevis.
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Conclusions:
After gastrulation, retinoic acid is required for lung but not thyroid differentiation in Xenopus while Fgf signalling is needed for lung but only for early expression of pax2 in the thyroid. Exposure to retinoic acid can cause the presumptive thyroid to switch to a lung developmental program.
Source: BMC Developmental Biology - Latest articles - December 20, 2011 Category: Zoology Authors: Jean WangSteven DeimlingNicole D'AlessandroLin ZhaoFred PossmayerThomas Drysdale Source Type: research
Spermatophore formation and sperm ultrastructure of Sundathelphusa philippina (Crustacea: Brachyura: Gecarcinucidae)Email this article to a colleague.
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AbstractKlaus, S., Münzner, S., Modenbach, A.‐C., Streit, B. and Tudge, C.C. (2011). Spermatophore formation and sperm ultrastructure of Sundathelphusa philippina (Crustacea: Brachyura: Gecarcinucidae). —Acta Zoologica (Stockholm) 00: 1–6.We investigated the morphology of spermatozoa, spermatophores and the anterior vas deferens (AVD) of the gecarcinucid freshwater crab Sundathelphusa philippina. The morphology of the acrosome (proportions, structure and arrangement of acrosomal layers) and the spermatophores complies with the known sperm and spermatophore morphology of the brachyuran family Gecarcinucidae. The sper...
Source: Acta Zoologica - December 19, 2011 Category: Zoology Authors: Sebastian Klaus, Susann Münzner, Anna‐Christina Modenbach, Bruno Streit, Christopher C. Tudge Source Type: research
Autophagy as the cell survival in response to a microsporidian infection of the midgut epithelium of Isohypsibius granulifer granulifer (Eutardigrada: Hypsibiidae)Email this article to a colleague.
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AbstractRost‐Roszkowska, M.M., Poprawa, I., Kaczmarek, Ł. 2011. Autophagy as the cell survival in response to a microsporidian infection of the midgut epithelium of Isohypsibius granulifer granulifer (Eutardigrada: Hypsibiidae). —Acta Zoologica (Stockholm) 00: 1–7.The midgut epithelial cells of many invertebrates may possess microorganisms which act as symbionts or pathogens (bacteria, microsporidia, viruses). During our previous studies on Isohypsibius granulifer granulifer Thulin, 1928 (Tardigrada, Eutardigrada), which examined alterations of the midgut epithelium during oogenesis, we found that some of the specim...
Source: Acta Zoologica - December 19, 2011 Category: Zoology Authors: Magdalena M. Rost‐Roszkowska, Izabela Poprawa, Łukasz Kaczmarek Source Type: research
Genital morphology of female goblin spiders (Arachnida: Araneae: Oonopidae) with functional implicationsEmail this article to a colleague.
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AbstractBurger, M. 2011. Genital morphology of female goblin spiders (Arachnida: Araneae: Oonopidae) with functional implications. —Acta Zoologica (Stockholm) 00: 1–11.Spider genital morphology usually provides the best characters for taxonomy. Furthermore, functional genital morphology helps to understand the evolution of complex genitalia and their role in the context of sexual selection. The genital systems of most haplogyne spider families are poorly investigated with respect to their morphology. The present study investigates the female genitalia of the oonopids Oonops pulcher, Oonopinus kilikus, and Pseudotriaeri...
Source: Acta Zoologica - December 19, 2011 Category: Zoology Authors: Matthias Burger Source Type: research
Development and validation of real‐time PCR for the detection of Yersinia ruckeriEmail this article to a colleague.
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AbstractYersiniosis (enteric red mouth disease) is a contagious bacterial disease caused by Yersinia ruckeri, which primarily affects salmonids. A real‐time PCR assay using a molecular beacon has been developed and validated to improve the detection of the causative biotypes of Y. ruckeri. The assay, which targets the glnA (glutamine synthetase) gene, proved to have 100% analytical specificity and analytical sensitivities of 5 fg and 3 × 103 CFU g−1 for DNA and seeded kidney tissue, respectively. The assay was highly repeatable with low % CV for intra‐ and inter‐run experiments, and the optimized parame...
Source: Journal of Fish Diseases - December 19, 2011 Category: Zoology Authors: S E KeelingC JohnstonR WallisC L BrosnahanN GudkovsW L McDonald Source Type: research
Prevalence of viral RNA from piscine reovirus and piscine myocarditis virus in Atlantic salmon, Salmo salar L., broodfish and progenyEmail this article to a colleague.
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Source: Journal of Fish Diseases - December 19, 2011 Category: Zoology Authors: C R Wiik‐NielsenP‐M R SkiA AunsmoM Løvoll Tags: Short communication Source Type: research
Spermatophore formation and sperm ultrastructure of Sundathelphusa philippina (Crustacea: Brachyura: Gecarcinucidae)Email this article to a colleague.
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AbstractKlaus, S., Münzner, S., Modenbach, A.‐C., Streit, B. and Tudge, C.C. (2011). Spermatophore formation and sperm ultrastructure of Sundathelphusa philippina (Crustacea: Brachyura: Gecarcinucidae). —Acta Zoologica (Stockholm) 00: 1–6.We investigated the morphology of spermatozoa, spermatophores and the anterior vas deferens (AVD) of the gecarcinucid freshwater crab Sundathelphusa philippina. The morphology of the acrosome (proportions, structure and arrangement of acrosomal layers) and the spermatophores complies with the known sperm and spermatophore morphology of the brachyuran family Gecarcinucidae. The sper...
Source: Acta Zoologica - December 19, 2011 Category: Zoology Authors: Sebastian KlausSusann MünznerAnna‐Christina ModenbachBruno StreitChristopher C. Tudge Source Type: research
Autophagy as the cell survival in response to a microsporidian infection of the midgut epithelium of Isohypsibius granulifer granulifer (Eutardigrada: Hypsibiidae)Email this article to a colleague.
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AbstractRost‐Roszkowska, M.M., Poprawa, I., Kaczmarek, Ł. 2011. Autophagy as the cell survival in response to a microsporidian infection of the midgut epithelium of Isohypsibius granulifer granulifer (Eutardigrada: Hypsibiidae). —Acta Zoologica (Stockholm) 00: 1–7.The midgut epithelial cells of many invertebrates may possess microorganisms which act as symbionts or pathogens (bacteria, microsporidia, viruses). During our previous studies on Isohypsibius granulifer granulifer Thulin, 1928 (Tardigrada, Eutardigrada), which examined alterations of the midgut epithelium during oogenesis, we found that some of the specim...
Source: Acta Zoologica - December 19, 2011 Category: Zoology Authors: Magdalena M. Rost‐RoszkowskaIzabela PoprawaŁukasz Kaczmarek Source Type: research
First description of Edwardsiella tarda in Senegalese sole, Solea senegalensis (Kaup)Email this article to a colleague.
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Source: Journal of Fish Diseases - December 17, 2011 Category: Zoology Authors: N CastroA. E. ToranzoS. DevesaA. GonzálezS. NuñezB. Magariños Tags: Short Communication Source Type: research
The potential of waste items in aquatic environments to act as fomites for viral haemorrhagic septicaemia virusEmail this article to a colleague.
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Source: Journal of Fish Diseases - December 17, 2011 Category: Zoology Authors: P H PhamJ JungJ S LumsdenB DixonN C Bols Tags: Short Communication Source Type: research
Studies on the effect of temperature and pH on the inactivation of fish viral and bacterial pathogensEmail this article to a colleague.
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AbstractDisposal of fish by‐products in the European Community must comply with Regulation (EC) No 1069/2009 which categorizes animal by‐products according to risk, and specifies methods of disposal of by‐products according to that risk. There is provision under the regulation for composting or ensiling to be used for by‐products from aquatic animals. Biosecurity considerations require knowledge of the parameters of time and temperature, or time and pH, required to inactivate any fish pathogens that may be present. To provide those data, we undertook laboratory studies on the inactivation of a number of fish pathog...
Source: Journal of Fish Diseases - December 17, 2011 Category: Zoology Authors: P F DixonD A SmailM AlgoëtT S HastingsA BayleyH ByrneM DodgeA GardenC JoinerE RobertsD Verner‐JeffreysF Thompson Source Type: research
Bacterial infections of Chinook salmon, Oncorhynchus tshawytscha (Walbaum), returning to gamete collecting weirs in MichiganEmail this article to a colleague.
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AbstractHerein, we describe the prevalence of bacterial infections in Chinook salmon, Oncorhynchus tshawytscha (Walbaum), returning to spawn in two tributaries within the Lake Michigan watershed. Ten bacterial genera, including Renibacterium, Aeromonas, Carnobacterium, Serratia, Proteus, Pseudomonas, Hafnia, Salmonella, Shewanella and Morganella, were detected in the kidneys of Chinook salmon (n = 480) using culture, serological and molecular analyses. Among these, Aeromonas salmonicida was detected at a prevalence of ∼15%. Analyses revealed significant interactions between location/time of collection and gender for ...
Source: Journal of Fish Diseases - December 17, 2011 Category: Zoology Authors: T P LochK ScribnerR TempelmanG WhelanM Faisal Source Type: research
The potential for targeted surveillance of live fish movements in ScotlandEmail this article to a colleague.
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AbstractThe network structure of the movements of live fish in the Scottish aquaculture industry has recently been demonstrated for 2003. In this paper, we enlarge this analysis to a longer 3‐year period from 2002 to 2004, the new data allowing complete coverage of at least one production cycle. The resulting network contains slightly more sites than that for a single year and is denser with more arcs (directed site‐to‐site connections) present, but otherwise features recognizable in the 1‐year network are still recognizable in the 3‐year network. Arc‐removal algorithms (a proxy for targeted surveillance) were ...
Source: Journal of Fish Diseases - December 17, 2011 Category: Zoology Authors: D M GreenM WerkmanL A Munro Source Type: research
Infanticide and Population Growth in the Bank Vole (Myodes glareolus): The Effect of Male Turnover and DensityEmail this article to a colleague.
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AbstractOne major intrinsic factor affecting recruitment of young into a population is infanticide, the killing of conspecific young by adult males. It occurs in most mammal species, like our study species the bank vole (Myodes glareolus), and is widely accepted as an adaptive behavior, which may increase male fitness via nutritional gain, decreased competition, or an increased access to mates. A turnover of males in a population increases the risk of infanticide owing to a disruption of social structures. In a controlled field study, we tested the effects of total male turnover and density on juvenile recruitment and fema...
Source: Ethology - December 17, 2011 Category: Zoology Authors: Annika OpperbeckHannu YlönenInes Klemme Tags: RESEARCH PAPER Source Type: research
Antioxidant combinations are no more beneficial than individual components in combating ram sperm oxidative stress during storage at 5°C.Email this article to a colleague.
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The objective was to investigate the benefits of antioxidant supplementation on the production of hydrogen peroxide (H(2)O(2)) by ram spermatozoa stored at 5°C over 3 days. Ejaculates from 9 rams were split between two defined diluents, INRA-96 and RSD-1, and cooled slowly to 5°C for storage. Four different additives (vitamin E phosphate 6-100μmol/L, catalase 500IU+superoxide dismutase 9-150μmol/L, and glutathione IU peroxidase, 20IU) were investigated both separately and in combination. The amount of H(2)O(2) generated was assessed by use of a 1-step fluorometric micro-plate assay. Sperm viability, acrosome integrity ...
Source: Animal Reproduction Science - December 17, 2011 Category: Zoology Authors: La Falci VS, Yrjö-Koskinen AE, Fazeli A, Holt WV, Watson PF Tags: Anim Reprod Sci Source Type: research
Enucleation after fusion and activation enhances the development of reconstructed bovine embryos.Email this article to a colleague.
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In conclusion, the reconstructed bovine embryos produced by the EAFA procedure revealed a better developmental competence with a lower methylation rate of satellite I gene than those produced by the EBFA procedure.
PMID: 22225596 [PubMed - as supplied by publisher]
Source: Animal Reproduction Science - December 17, 2011 Category: Zoology Authors: Cheng WT, Liu BT, Su HY, Lee JW, Wang CH, Lee SN, Chu FH, Yang DW, Chen LR, Shen PC Tags: Anim Reprod Sci Source Type: research
Induction of ovarian follicular wave emergence and ovulation in progestin-based timed artificial insemination protocols for Bos indicus cattle.Email this article to a colleague.
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Abstract
The present study aimed to evaluate the efficacy of different inducers of new follicular wave emergence (FWE) and ovulation in fixed-time artificial insemination (FTAI) synchronization protocols using norgestomet ear implants (NORG) in Bos indicus cattle. In Experiment 1, the synchronization of FWE was evaluated when two different estradiol esters in different doses [2mg estradiol benzoate (EB), 2.5mg EV or 5mg estradiol valerate (EV)] were administered with NORG implant insertion in B. indicus cattle (estrous cyclic heifers and cows with suckling calves; n=10 per treatment). After estradiol treatment, ova...
Source: Animal Reproduction Science - December 17, 2011 Category: Zoology Authors: Sá Filho MF, Baldrighi JM, Sales JN, Crepaldi GA, Carvalho JB, Bó GA, Baruselli PS Tags: Anim Reprod Sci Source Type: research
Effect of estrus synchronization treatment after luteolysis on Holstein heifers as embryo transfer recipientsEmail this article to a colleague.
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This study was designed to evaluate the effect of estrus synchronization treatments on recipient heifers for embryo transfer (ET). Holstein heifers were separated into the following three groups: (i) an administration of 50 µg GnRH (gonadotropin‐releasing hormone) analog was given to heifers at a random stage of the estrus cycle, followed 7 days later by two administrations of 7.5 mg prostaglandin F2 alfa analog (PG) as control; (ii) another administration of 100 µg GnRH was given to the control group at 48 h after the administration of PG as the second GnRH group; and (iii) an administration of 0.75 mg est...
Source: Animal Science Journal - December 16, 2011 Category: Zoology Authors: Tatsuyuki YOSHIDA, Taro SATO, Koji CHIBA, Itaru YOSHIMURA, Masahiro OSADA, Konosuke OKADA, Hiroki FURUTA, Akihiko OHTA, Hitoshi USHIJIMA Source Type: research
Ammonia‐oxidizing Archaea in laboratory‐scale activated sludge systems for wastewater of low‐ or high‐ammonium concentrationEmail this article to a colleague.
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In this study, to investigate the relationships between AOA population and ammonia concentration, AOA was monitored in two laboratory‐scale reactors treating artificial wastewater of different ammonium concentrations by denaturing gradient gel electrophoresis targeting ammonia monooxygenase genes. At day 60 of the operation, AOA populations dominant in each reactor differed, suggesting the importance of influent ammonia concentration in dominant AOA selection.
Source: Animal Science Journal - December 16, 2011 Category: Zoology Authors: Ryu OISHI, Kayako HIROOKA, Kenichi OTAWA, Chika TADA, Yutaka NAKAI Source Type: research
Effect of estrus synchronization treatment after luteolysis on Holstein heifers as embryo transfer recipientsEmail this article to a colleague.
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This study was designed to evaluate the effect of estrus synchronization treatments on recipient heifers for embryo transfer (ET). Holstein heifers were separated into the following three groups: (i) an administration of 50 µg GnRH (gonadotropin‐releasing hormone) analog was given to heifers at a random stage of the estrus cycle, followed 7 days later by two administrations of 7.5 mg prostaglandin F2 alfa analog (PG) as control; (ii) another administration of 100 µg GnRH was given to the control group at 48 h after the administration of PG as the second GnRH group; and (iii) an administration of 0.75 mg est...
Source: Animal Science Journal - December 16, 2011 Category: Zoology Authors: Tatsuyuki YOSHIDATaro SATOKoji CHIBAItaru YOSHIMURAMasahiro OSADAKonosuke OKADAHiroki FURUTAAkihiko OHTAHitoshi USHIJIMA Source Type: research
A Comparative Method for Both Discrete and Continuous Characters Using the Threshold ModelEmail this article to a colleague.
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The American Naturalist, Volume 0, Issue 0, Page 000, Ahead of Print.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Source Type: research
Poison Frog Colors Are Honest Signals of Toxicity, Particularly for Bird Predators.Email this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page E1-E14, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article E-Articles Source Type: research
How Likely Is Speciation in Neutral Ecology?Email this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page 137-144, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Notes and Comments Source Type: research
Are Gastropods, Rather than Ants, Important Dispersers of Seeds of Myrmecochorous Forest Herbs?Email this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page 124-131, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Natural History Miscellany Source Type: research
The Forms and Fitness Cost of Senescence: Age-Specific Recapture, Survival, Reproduction, and Reproductive Value in a Wild Bird Population.Email this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page E15-E27, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article E-Articles Source Type: research
Low Genetic Variance in the Duration of the Incubation Period in a Collared Flycatcher (Ficedula albicollis) Population.Email this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page 132-136, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Notes and Comments Source Type: research
UV Photoreceptors and UV-Yellow Wing Pigments in Heliconius Butterflies Allow a Color Signal to Serve both Mimicry and Intraspecific Communication.Email this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page 38-51, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Articles Source Type: research
Reconciling the Omnivory-Stability Debate.Email this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page 22-37, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Articles Source Type: research
AnnouncementsEmail this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page ii-iii, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Source Type: research
E. O. Wilson Naturalist AwardEmail this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page iv-vi, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Source Type: research
Sewall Wright AwardEmail this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page iv, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Source Type: research
Patterns of Species Ranges, Speciation, and Extinction.Email this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page 1-21, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Articles Source Type: research
Unexpected Benefit of a Social Parasite for a Key Fitness Component of Its Ant Host.Email this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page 110-123, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Articles Source Type: research
Constraint and Opportunity: The Genetic Basis and Evolution of Modularity in the Cichlid Mandible.Email this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page 64-78, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Articles Source Type: research
Generation Separation in Simple Structured Life Cycles: Models and 48 Years of Field Data on a Tea Tortrix Moth.Email this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page 95-109, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Articles Source Type: research
2011 American Society of Naturalists AwardsEmail this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page iv-vi, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Source Type: research
Quantitative Genetics of a Carotenoid-Based Color: Heritability and Persistent Natal Environmental Effects in the Great Tit.Email this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page 79-94, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Articles Source Type: research
Evolution of Host Life-History Traits in a Spatially Structured Host-Parasite System.Email this article to a colleague.
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The American Naturalist, Volume 179, Issue 1, Page 52-63, January 2012.
Source: The American Naturalist - December 15, 2011 Category: Zoology Tags: article Articles Source Type: research
Survival and antipredator behavior of woodchucks (Marmota monax) along an urban–agricultural gradientEmail this article to a colleague.
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Canadian Journal of Zoology, Volume 0, Issue 0, Page 12-21, e-First articles.
Source: Canadian Journal of Zoology - December 15, 2011 Category: Zoology Tags: article Source Type: research
Shelter Availability, Occupancy, and Residency in Size‐Asymmetric Contests Between Rusty Crayfish, Orconectes rusticusEmail this article to a colleague.
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In this study, we evaluated the importance of shelter residency effects relative to size differences between rusty crayfish (Orconectes rusticus) as potential competitors for access to shelter. The intensity of any residency effects was manipulated by altering the number of shelters in the arena. Our results suggest that any residency effect is very weak in this system, and if present, may often be masked by the strong and pervasive influence on contest outcome of the relative body sizes of the contestants. We also found that both shelter number and crayfish size asymmetries had strong, independent effects on levels of agg...
Source: Ethology - December 15, 2011 Category: Zoology Authors: Nathan M. KlarPhilip H. Crowley Tags: RESEARCH PAPER Source Type: research
Does Weather or Site Characteristics Influence the Ability of Scavengers to Locate Food?Email this article to a colleague.
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AbstractOlfactory predators and scavengers rely on odors to locate food, and they forage primarily at night. We hypothesized that weather (e.g. wind speed, humidity, and temperature), vegetation, and landscape features affect the dissipation of odors in the atmosphere and, thus, impact the foraging efficiency of olfactory predators. We tested this hypothesis by assessing what conditions were correlated with the persistence of bait along the dike surrounding Willard Bay Reservoir, Utah. We distributed 124 chicken eggs and 199 dead European starlings (Sturnus vulgaris) as bait over 21 separate occasions spanning from May 21,...
Source: Ethology - December 15, 2011 Category: Zoology Authors: Rebekah E. RuzickaMichael R. Conover Tags: RESEARCH PAPER Source Type: research
Isotopic Data Do Not Support Food Sharing Within Large Networks of Female Vampire Bats (Desmodus rotundus)Email this article to a colleague.
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AbstractReciprocal altruism is considered to be particularly stable when occurring in small networks. Using a stable isotope approach, we tested in colonies of vampire bats (Desmodus rotundus) whether food sharing occurs among few or many females; vampires are known to regurgitate recently ingested blood for starving conspecifics. Accordingly, the isotopic signatures of vampires depend not only on individual prey choice but also on the extent of food sharing among isotopically contrasting conspecifics. By measuring the stable carbon isotope ratio in tissues with varying isotopic retention in individual vampires (blood: app...
Source: Ethology - December 15, 2011 Category: Zoology Authors: Christian C. VoigtSilke L. Voigt‐HeuckeKarin Schneeberger Tags: RESEARCH PAPER Source Type: research
The Evolution of Large Testes: Sperm Competition or Male Mating Rate?Email this article to a colleague.
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AbstractA positive relationship across species between the extent to which females mate with more than one male and relative testes mass has been demonstrated in a wide range of vertebrate taxa and certain insects. At least two hypotheses, which are not necessarily mutually exclusive, could account for this pattern: (1) the numerical sperm competition hypothesis, which assumes that larger testes enable the male to transfer more sperm to each female, giving the male an advantage in sperm competition and (2) the male mating rate hypothesis, which proposes that larger testes allow the male to produce a greater number of (pote...
Source: Ethology - December 15, 2011 Category: Zoology Authors: Karim VahedDarren J. Parker Tags: CURRENT ISSUES ‐ PERSPECTIVES AND REVIEWS Source Type: research
African Wild Dogs as a Fugitive Species: Playback Experiments Investigate How Wild Dogs Respond to their Major CompetitorsEmail this article to a colleague.
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AbstractIt has been suggested that African wild dogs Lycaon pictus need exceptionally large home ranges (and hence occur at such low densities) because they are limited by competition with larger sympatric carnivores, namely lions Panthera leo and spotted hyenas Crocuta crocuta. To investigate this relationship at a proximate level and explore which factors mediate it, we conducted audio playback experiments examining how wild dogs responded to the simulated proximity of either lions or hyenas. The principle finding was that wild dogs consistently moved directly away from lion roars, but when played hyena whoops either sto...
Source: Ethology - December 15, 2011 Category: Zoology Authors: Hugh WebsterJohn W. McNuttKaren McComb Tags: RESEARCH PAPER Source Type: research
Aggressive Signal Design in the Jacky Dragon (Amphibolurus muricatus): Display Duration Affects EfficiencyEmail this article to a colleague.
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In this study, we tested whether the characteristics (duration, speed and frequency) of an aggressive display, the push‐up body rock, exhibited by the Jacky dragon (Amphibolurus muricatus) have likely evolved for optimal signal efficiency, as it is able to draw attention to the signaller. We performed two video playback experiments using high‐resolution 3D animations testing the effect of variation in push‐up body rock structure. In experiment 1, we manipulated push‐up body rock display structure. We gradually increased the number of push‐ups exhibited by a digitally animated Jacky dragon increasing the overall d...
Source: Ethology - December 15, 2011 Category: Zoology Authors: Kevin L. WooGuillaume Rieucau Tags: RESEARCH PAPER Source Type: research
Mallards Feed Longer to Maintain Intake Rate under Competition on a Natural Food DistributionEmail this article to a colleague.
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This study underlines that a higher competitor density does not necessarily lead to a lower intake rate, irrespective of dominance status.
Source: Ethology - December 15, 2011 Category: Zoology Authors: Jacintha G. B. van DijkSjoerd DuijnsAbel GyimesiWillem F. de BoerBart A. Nolet Tags: RESEARCH PAPER Source Type: research
Movements and Conflicts in a Flock of Foraging Black‐Tailed Godwits (Limosa limosa): The Influence of Feeding Rates on Behavioural DecisionsEmail this article to a colleague.
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AbstractWe studied movements and conflicts within a small flock of free‐living black‐tailed godwits foraging on benthic invertebrates in a brackish lagoon. To interpret our results in the framework of foraging theory, we studied the influence of individual feeding rate on the decisions to move and to attack flock companions. Birds changed their position within the flock more often when their intake rate was low and sometimes attacked conspecifics to supplant them from their feeding place. Aggressors significantly avoided front attacks and were almost always successful. They attacked individuals having higher feeding ra...
Source: Ethology - December 15, 2011 Category: Zoology Authors: Etienne SirotPhilippe MaesGuillaume Gélinaud Tags: RESEARCH PAPER Source Type: research
The response of early neural genes to FGF signaling or inhibition of BMP indicate the absence of a conserved neural induction moduleEmail this article to a colleague.
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Conclusions:
We demonstrate that BMP inhibition and FGF signaling induce neural genes independently of each other. Together our data indicate that although the spatiotemporal expression patterns of early neural genes are similar, the mechanisms involved in their expression are distinct and there are different signaling requirements for the expression of each gene.
Source: BMC Developmental Biology - Latest articles - December 15, 2011 Category: Zoology Authors: Crystal RogersGeorge FerzliElena Casey Source Type: research
Editorial: New associate editors for invertebratesEmail this article to a colleague.
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Source: Acta Zoologica - December 14, 2011 Category: Zoology Authors: Lennart Olsson Source Type: research
Spermatological characters in the diphyllobothriidean Schistocephalus solidus (Cestoda)Email this article to a colleague.
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AbstractLevron, C., Yoneva, A. and Kalbe, M. 2011. Spermatological characters in the diphyllobothriidean Schistocephalus solidus (Cestoda). —Acta Zoologica (Stockholm) 00: 1–8.The spermiogenesis and the mature spermatozoon of Schistocephalus solidus (Cestoda: Diphyllobothriidea) are described using transmission electron microscopy. Spermiogenesis in S. solidus begins with the formation in the spermatid of a differentiation zone surrounded by cortical microtubules and delimited by arching membranes. This conical area presents two centrioles associated with striated rootlets and a median cytoplasmic extension between th...
Source: Acta Zoologica - December 14, 2011 Category: Zoology Authors: Céline LevronAneta YonevaMartin Kalbe Source Type: research
