Reproduction History Research Articles

Female oxidative status, egg antioxidant protection and eggshell pigmentation: a supplemental feeding experiment in great tits

Oxidative stress has been suggested as a mechanism underlying the costs of reproduction and life history trade-offs. Reproductive activities may lead to high production of pro-oxidants, whose activity can generate oxidative damage when not countered by adequate antioxidant defenses. Because inter-individual differences in the efficiency of the antioxidant system are influenced by an individual’s diet, food availability experienced during reproduction may affect the females’ antioxidant status and, in birds, their ability to transfer antioxidants into their eggs. Moreover, a female’s ability to cope with oxidative stress has been suggested to influence pigment deposition in the eggshell, suggesting a possible signaling function of eggshell maculation. Here we performed a food supplementation experiment in a natural population of great tits (Parus major) in order to investigate how nutritional conditions experienced during the egg laying period affect the female’s oxidative status and egg investment and how maternal oxidative status and egg antioxidant protection relate to eggshell pigmentation. We show that food-supplemented females had lower oxidative damage levels (ROMs) than non-food-supplemented females. Furthermore, a female’s ROMs levels were negatively associated with the levels of yolk antioxidant protection in her eggs, but this negative association was only significant in non-food-supplemented females. This suggests that oxidative stress experienced during reproduction influences the allocation of antioxidants into the eggs. Moreover, we observed a positive relationship between eggshell pigment distribution and maternal and yolk antioxidant protection, suggesting that eggshell pigmentation is a cue of female (and offspring) quality.

Dynamics of alpine treelines: positive feedbacks and global, regional and local controls

Whilst it is clear that increasing temperatures from global environmental change will impact the positions of alpine treelines, it is likely that a range of regional and local scaled factors will mediate the overall impact of global scale climate drivers. We summarized 12 categories of abiotic and biotic factors as 4 groups determining treeline positions. First, there are global factors related to climate-induced growth limitation and carbon limitation. Second, there are seven regional and local factors related to treeline dynamics including frost stress, topography, water stress, snow, wind, fire and non-fire disturbance. Third, species-specific factors can control treeline dynamics through their influence on reproduction and life history traits. Fourth, there are positive feedbacks in structuring the dynamics of treelines. Globally, the commonly accepted growth limitation hypothesis is that growth at a treeline is limited by temperature. Meanwhile, positive feedbacks between canopy cover and tree establishment are likely to control the spatial pattern and temporal dynamics of many treelines. The presence of non-linear dynamics at treelines has implications for the use of treelines as barometers of climate change because the lagged responses and abrupt shifts inherent in non-equilibrium systems may combine to mask the overall climate trend.

Sex- and melanism-specific variations in the oxidative status of adult tawny owls in response to manipulated reproductive effort.

Oxidative stress, determined by the balance between the production of damaging reactive oxygen species (ROS) and antioxidant defences, is hypothesized to play an important role in shaping the cost of reproduction and life history trade-offs. To test this hypothesis, we manipulated reproductive effort in 94 breeding pairs of tawny owls (Strix aluco) to investigate the sex- and melanism-specific effects on markers of oxidative stress in red blood cells (RBCs). This colour polymorphic bird species shows sex-specific division of labour and melanism-specific history strategies. Brood sizes at hatching were experimentally enlarged or reduced to increase or decrease reproductive effort, respectively. We obtained an integrative measure of the oxidative balance by measuring ROS production by RBCs, intracellular antioxidant glutathione levels and membrane resistance to ROS. We found that light melanic males (the sex undertaking offspring food provisioning) produced more ROS than darker conspecifics, but only when rearing an enlarged brood. In both sexes, light melanic individuals had also a larger pool of intracellular antioxidant glutathione than darker owls under relaxed reproductive conditions (i.e. reduced brood), but not when investing substantial effort in current reproduction (enlarged brood). Finally, resistance to oxidative stress was differently affected by the brood size manipulation experiment in males and females independently of their plumage coloration. Altogether, our results support the hypothesis that reproductive effort can alter the oxidative balance in a sex- and colour-specific way. This further emphasizes the close link between melanin-based coloration and life history strategies.

Life expectancy and longevity of varanid lizards (Reptilia:Squamata:Varanidae) in North American zoos.

In zoos, life expectancy-the average lifespan of individuals within a population, and longevity-the maximum lifespan within a population, can be useful parameters for evaluating captive husbandry and animal welfare. Using life history and demographic data derived from regional studbooks, this study examined life expectancy and longevity in a total of 782 wild-caught (WC) and captive-bred (CB) varanid lizards of seven species maintained in North American zoos since 1926. The average lifespans for WC and CB animals were 6.3 ± 0.3 and 9.3 ± 0.4 years, respectively, with CB males living significantly longer than females (P = 0.009). A total of 26.4% of WC and 22.5% of CB animals experienced mortality during their first 2 years in captivity, with mortality during this period greatest among Varanus rudicollis and V. prasinus. A positive correlation was observed between life expectancy and adult body mass in captive-bred individuals (r = 0.981; P = 0.002). Wild-caught females with a history of successful reproduction had a significantly greater average lifespan than non-reproducing females (P < 0.0001). Results from this study suggest that varanids have not been reaching their lifespan capacities in North American zoos. In light of these findings, several husbandry-related factors which may be affecting the welfare and lifespans of varanids in zoos are identified and discussed. This study also highlights the utility of demographic and life history data in captive animal management, and offers a general framework for future herpetological studies of a similar nature.

The Special Science Dilemma and How Culture Solves It

I argue that there is a tension between the claim that at least some kinds in the special sciences are multiply realized and the claim that the reason why kinds are prized by science is that they enter into a variety of different empirical generalizations. Nevertheless, I show that this tension ceases in the case of ‘cultural homologues’—such as specific ideologies, religions, and folk wisdom. I argue that the instances of such special science kinds do have several projectable properties in common due to their shared history of reproduction, and that the social learning involved means that we should also expect these kinds to be multiply realized.

A review of the Polystira clade--the Neotropic's largest marine gastropod radiation (Neogastropoda: Conoidea: Turridae sensu stricto).

The Polystira clade (here comprising Polystira and Pleuroliria) is a poorly known but hyper-diverse clade within the neogastropod family Turridae (sensu stricto). It has extensively radiated within the tropics and subtropics of the Americas, to which it is endemic. In this paper we present a synthetic overview of existing information on this radiation together with new information on estimated species diversity, systematic relationships, a species-level molecular phylogenetic analysis and preliminary macroecological and diversification analyses, to serve as a platform for further study. We currently estimate that about 300 species (122 extant) are known from its 36 million year history but this number will undoubtedly increase as we extend our studies. We discuss the relationships of Polystira to other Neotropical Turridae (s.s.) and examine the taxonomy and systematics of the geologically oldest described members of the clade. To aid taxonomic description of shells we introduce a new notation for homologous major spiral cords. Focusing on key publications, we discuss in detail the changing historical understanding of the taxonomy of the clade and the relationships of its component genus-level taxa: Polystira Woodring, 1928, Pleuroliria de Gregorio, 1890, Josephina Gardner, 1945 and Oxytropa Glibert, 1955. We designate a neotype for Pleurotoma (Pleuroliria) supramirifica de Gregorio, 1890, to stabilize our understanding of this, the type species of Pleuroliria. Application of the name Oxytropa is restricted to the type species. The genus Polystira is conchologically re-described and for the first time we synthesize available information on the anatomy, feeding and toxinology, reproduction and life history, larval modes and life habits, and geographic and bathymetric ranges of its species. We give an updated list of the 19 formally described living species and present the pitfalls of the currently poor species-level taxonomy of Polystira using case examples. We present a molecular phylogenetic analysis of 22 extant species using three mitochondrial gene fragments (COI, 12S rRNA and 16S rRNA). This reveals undescribed species and indicates that Recent genetic clades ('biospecies') are consistent with finely divided conchological 'morphospecies'. Historically, there has been a slow realisation of the high species diversity of the Polystira clade and we consider that this may be due to inadequate precision of morphological description of shells and a lack of clear homology statements. We suggest how these both might be improved. Finally, using a data compilation based on museum specimens we examine species range-size distributions and species abundance distributions for 85 of the 112 extant western Atlantic species that we have delimited to date. Our results indicate that the majority of species are rare and have short geographic ranges; only a few are wide-ranging and abundant. This has important implications for surveys of biodiversity.

Infraspecific diversity in a spore-dispersed species with limited distribution range

Infraspecific genetic diversity is generally underestimated in biodiversity assessments. We use haplotype patterns based on the nuclear gpd and plastid rpl16 to examine whether genetic diversity is related to geography, gender, habitat and/or frequency of sexual reproduction in Drepanocladus lycopodioides. This moss is restricted to western Eurasian semi-natural and natural habitats and decreases in frequency in many parts of Europe. Haplotype diversity differs among three regional populations (Öland, Gotland, Stockholm archipelago) in its South Swedish Baltic core distribution area and is positively affected by patch size. The regional populations differ from each other genetically and haplotype variation is unequally partitioned between the genders, most likely a result of immigration history and limited equalizing effects of sexual reproduction. In a Holocene context, the regional populations of Öland and Gotland display evidence of a decrease or bottleneck, and immigration into both regions. We suggest that higher haplotype diversity in Gotland and Öland and lack of migration to the Stockholm archipelago may be an effect of longer colonization history of the former, and niche pre-emption in the natural habitats of the latter. The Baltic population is representative for the genetically relatively homogeneous European population, and D. lycopodioides displays low ITS variation compared with other European mosses. In a conservation context it is relevant that the three regional populations are not interchangeable. It is of concern that three populations within the species’ core distribution are vulnerable. Our results strongly suggest that infraspecific genetic diversity must be considered in the management of the species at the continental level.

A ‘behaviorscape’ perspective on stream fish ecology and conservation: linking fish behavior to riverscapes

Landscape ecology (and its application to rivers and streams: riverine landscapes or riverscapes) provides an expansive depiction of patterns of physical and biological phenomena, yet mechanisms driving those patterns are rarely identified. Behavioral ecology aims to elucidate mechanisms of organisms' response to their environment, but often lacks the context of natural conditions and the surrounding landscape or riverscape. Bringing together the relative strengths of these two fields—context in the case of riverscapes and mechanism in the case of behavioral ecology—can provide fisheries managers and conservation biologists with improved predictions of fish response to anthropogenic impacts such as habitat degradation, landscape fragmentation, and climate change. Existing research on fish behavior incorporating a riverscape perspective includes the study of fish migration and dispersal, habitat selection, and reproduction and life history strategies. The merging of these disciplines is termed ‘behaviorscapes’ and a program of research would adhere to four principles: (1) study fish populations or communities in a natural setting, (2) account for landscape and riverscape context, (3) incorporate a refined understanding of fish behavior, and (4) forge linkages between individual behavior and population or community demographics. Several potential directions for future research exist, including developing or improving technologies to map internal heterogeneity of rivers; making explicit links between that heterogeneity and fish behavior through observations or experiments; and employing an iterative approach to using ecological knowledge, a priori hypotheses, and precise spatial analysis to bridge the pattern‐process divide. WIREs Water 2014, 1:385–400. doi: 10.1002/wat2.1033This article is categorized under: Water and Life &gt; Conservation, Management, and Awareness Water and Life &gt; Nature of Freshwater Ecosystems Human Water &gt; Water as Imagined and Represented

Fish larvae at fronts: Horizontal and vertical distributions of gadoid fish larvae across a frontal zone at the Norwegian Trench

The reproduction and early life history of many fish species are linked to the physical and biological characteristics of fronts. In order to ascertain linkages between frontal physics and fish larvae, we investigated distributional differences among gadoid fish larvae comparing these to both horizontal and vertical variability in hydrography and abundances of potential copepod prey The investigation was carried out at a frontal zone along the Norwegian Trench in the northern North Sea, and was based on a series of cross-bathymetric sampling transects. Tows with a large ring net and an opening–closing net were used for describing fish larval horizontal and vertical distributions, while a submersible pump was used for describing vertical distributions of copepods. Hydrographic profiles and current velocity measurements were used to outline variability in temperature, salinity and current structure. Measurements demonstrated a distinct bottom front at the southern slope of the Trench with deepening isopycnals and high chlorphyll a concentrations. Abundances of both gadoid fish larvae and copepods peaked in vicinity of the front around mid-depth, and findings points to an inter-connection between the vertical and horizontal distributions of each species. However, the three-dimensional pattern of distribution differed significantly among species of larvae and species of copepods. The study underlines the complexity of bio-physical interrelationships in the frontal zone, and indicates that the zone encompasses specific ecological niches to which each species of fish larvae is adapted.

A pragmatic species concept applicable to all eukaryotic organisms independent from their mode of reproduction or evolutionary history

It is shown that the species concept of Ernst Mayr does not consider the evolution and modes of reproduction of eucaryotic organisms as a whole. It is only translatable into a taxonomic practice in a very special situation: sexually reproducing and sympatrically occurring organisms that do not exchange genes. Mayr’s central criterion of reproductive isolation is not applicable to the pervasive cases of reticulate evolution, to numerous groups of organisms with asexual reproduction, to the frequent situations of allopatry and to classification of fossil organisms. Evaluating advantages and disadvantages of five broadly applied species concepts and integrating elements of the related concepts of Sonneborn (1957), Sokal & Crovello (1970) and De Queiroz (2007), a new synthesis, called the Pragmatic Species Concept, is presented: ‘A species is a cluster of organisms which passed a threshold of evolutionary divergence. Divergence is determined by one or several operational criteria described by an adequate numerics. A single conclusive operational criterion is sufficient. Conflicts between operational criteria require an evolutionary explanation. Thresholds for each operational criterion are fixed by consensus among the experts of a discipline under the principle of avoiding over-splitting. Clusters must not be the expression of intraspecific polymorphism.’ This concept is applicable to all known groups of eukaryotic organisms independent from their mode of reproduction or evolutionary history. It allows both an approach by multisource integrative taxonomy as well as by a single discipline and is open for integrating new disciplines. The concept enables sound taxonomic decisions also in case of reticulate evolution, parthenogenesis, apomixis, allopatry, separate time horizons and reversal of strong evolutionary divergence. The complex problem could only be solved by focusing on the degree of evolutionary divergence, reproducible numeric data recording, adequate numeric analyses and the threshold principle. Recommendations of how to translate this concept into a taxonomic practice are given.

Physiological and practical effects of progesterone on reproduction in dairy cattle

The discovery of progesterone (P4) and elucidation of the mechanisms of P4 action have an important place in the history of endocrinology and reproduction. Circulating P4 concentration is determined by a balance between P4 production, primarily by the corpus luteum (CL), and P4 metabolism, primarily by the liver. The volume of luteal tissue and number and function of large luteal cells are primary factors determining P4 production. Rate of P4 metabolism is generally determined by liver blood flow and can be of critical importance in determining circulating P4 concentrations, particularly in dairy cattle. During timed artificial insemination (AI) protocols, elevations in P4 are achieved by increasing number of CL by creating accessory CL or by supplementation with exogenous P4. Dietary manipulations can also alter circulating P4, although practical methods to apply these techniques have not yet been reported. Elevating P4 before the timed AI generally decreases double ovulation and increases fertility to the timed AI. Near the time of AI, slight elevations in circulating P4, possibly due to inadequate luteal regression, can dramatically reduce fertility. After AI, circulating P4 is critical for embryo growth and establishment and maintenance of pregnancy. Many studies have attempted to improve fertility by elevating P4 after timed AI. Our recent meta-analysis and manipulative study indicated small fertility benefits (3% to 3.5%) mostly in primiparous cows. Thus, previous research has provided substantial insight into mechanisms regulating circulating P4 concentrations and actions. Understanding this prior research can focus future research on P4 manipulation to improve reproductive success.

The Gamble of Reproduction: Conceiving Ada’s Queer Temporalities

This paper will consider the relationship between the body, reproduction, and feminist history in Lynn Hershman Leeson's 1997 film Conceiving Ada. The film focuses on contemporary computer scientist Emmy's attempt to save Ada, Countess of Lovelace, from being forgotten from history. The main threat to both Ada and Emmy's work is their respective pregnancies and thus the film at first seems to represent the female body's biological reproduction as antagonistic to the (desired) reproduction of feminist history. In a move that resonates with cyberfeminist theory, it is computer technology that enables Emmy to perfectly reproduce Ada's memories in the present. However, despite this seeming turn to digital reproduction, I argue that the film resists turning away from the female reproductive body. Instead, through Emmy's work to recover Ada, the film explores the pregnant body as a queer transmitter of history. Through the metaphor of 'gambling', the film explores the uneven temporalities of genetic inheritance, considering how inheritance is always tied to the past yet never entirely determined by this past. The 'gamble of reproduction' pushes queer temporality theory in its representation of the pregnant body while also offering a model of reproduction which is neither a barrier to feminist history nor a guarantee that the past can be copied perfectly into the future.

Patterns of genotypic diversity suggest a long history of clonality and population isolation in the Australian arid zone shrub Acacia carneorum

For plants capable of both sexual and clonal reproduction, the relative frequency of these reproductive modes is influenced by genetic and ecological factors. Acacia carneorum is a threatened shrub from the Australian arid zone that occurs as a set of small, spatially isolated populations. Sexual reproduction appears to be very rare: despite regular flowering, only two populations set seed. It is not known whether this reflects an ancient pattern, or results from rapid land use changes following arrival of Europeans in the region 150 years ago. We assessed genotypic variation throughout the range of A. carneorum using AFLP markers, to elucidate the relative importance of clonal and sexual reproduction in this species’ history. Clonal diversity (CD) within populations ranged from 0 to 0.820 (mean CD = 0.270, SE = 0.094), but the relative abundances of genets were typically highly skewed. On average, the two fruiting populations had higher CD (mean CD = 0.590, SE = 0.265) than non-fruiting populations (mean CD = 0.179, SE = 0.077) (t = 2.315, p = 0.049), but most populations contained multiple genets. All genets were population-specific, and there was substantial divergence among populations (Φ ST = 0.690), implying a long history of isolation. We conclude that clonality has predominated in A. carneorum populations, with occasional sexual recruitment, and that current failure of most populations to set seed likely reflects both a long history of asexual reproduction and effects of habitat disturbance. Conservation of this species may benefit from translocations to increase genotypic diversity within populations.

Elevated CO2 affects embryonic development and larval phototaxis in a temperate marine fish

As an effect of anthropogenic CO2 emissions, the chemistry of the world's oceans is changing. Understanding how this will affect marine organisms and ecosystems are critical in predicting the impacts of this ongoing ocean acidification. Work on coral reef fishes has revealed dramatic effects of elevated oceanic CO2 on sensory responses and behavior. Such effects may be widespread but have almost exclusively been tested on tropical reef fishes. Here we test the effects elevated CO2 has on the reproduction and early life history stages of a temperate coastal goby with paternal care by allowing goby pairs to reproduce naturally in an aquarium with either elevated (ca 1400 μatm) CO2 or control seawater (ca 370 μatm CO2). Elevated CO2 did not affect the occurrence of spawning nor clutch size, but increased embryonic abnormalities and egg loss. Moreover, we found that elevated CO2 significantly affected the phototactic response of newly hatched larvae. Phototaxis is a vision-related fundamental behavior of many marine fishes, but has never before been tested in the context of ocean acidification. Our findings suggest that ocean acidification affects embryonic development and sensory responses in temperate fishes, with potentially important implications for fish recruitment.

The association between glucose challenge test level and fetal nutritional status

Objective: To examine the relationship between maternal glucose challenge test (GCT) levels and fetal nutritional status index (FNSI: a ratio of child’s birth weight (kg) over squared maternal height (m2).Methods: A total of 2193 women from the Beichen district, Tianjin, China, who had 50 g GCT at gestational age 24–28 weeks, gave a full-term singleton birth between June 2011 and October 2012, and with both maternal height and birth weight measures are included in this report.Results: Approximately 28.0% of women had a GCT ≥ 7.8 mmol/L. The newborns of mothers with a GCT ≥ 7.8 mmol/L had significantly higher level of FNSI ([kg/m2], boys: 1.336 versus 1.296, p < 0.001; girls: 1.312 versus 1.268, p < 0.0001). Logistic regression results, after adjustment for maternal age, residence, education, nationality, history of disease and reproduction, insurance and gestational age, indicated that every unit increase in FNSI was associated with approximately threefold higher odds (OR [95% CI]: 3.6 [1.5, 8.9]) of being in GCT ≥ 7.8 mmol/L for women giving birth as boys and fivefold higher odds (5.9 [2.5, 14.1]) for giving birth as girls.Conclusions: Women with a GCT ≥ 7.8 mmol/L have babies with a higher FNSI, suggesting that these infants may be overnourished before birth and may increase cardiovascular risk in their future.

Ubiquitin-specific protease (USP26) gene alterations associated with male infertility and recurrent pregnancy loss (RPL) in Iranian infertile patients

The human X chromosome is enriched with testis-specific genes that may be crucial for male fertility. Mutations in USP26 gene have been proposed to be associated with male infertility. Moreover, the importance of the ubiquitin pathway during different stages of mammalian fertilization and even embryo development has been addressed. Some mutations and haplotypes on this gene have been proposed to be associated with male infertility. In this study, five different mutations on USP26 were investigated: 1737G > A, 1090 C > T, 370-371ins ACA, 494T > C and 1423 C > T. The study included 166 infertile men with non-obstructive azoospermia, 72 male partners of couples who had previously experienced ≥3 clinical first trimester spontaneous abortions and 60 fertile men. Besides family history of reproduction, hormonal evaluation and semen analysis were performed. DNA was extracted from blood samples. PCR-SSCP, PCR-RFLP and PCR Product Cloning methods were used and resumed by sequencing to insure about the mutations. Moreover, USP26 gene expression was studied by Real-Time PCR after RNA extraction followed by cDNA synthesis from 24 testis biopsies in obstructive and non-obstructive azoospermia patients. The results indicate that there is a haplotype between three observed mutations in Iranian population include: 370-371insACA, 1423C > T and 494T > C. This haplotype was seen in control group as well. Surprisingly, total frequency of mutations in men with history of idiopathic RPL and azoospermic cases were significantly higher than that of in control groups (p < 0.05). Serum testosterone concentrations and testicular volume did not differ in the mutation positive group compared with the non-mutation group. About the USP26 gene expression, there is a significant difference between the expression levels of obstructive azoospermia, complete maturation arrest samples and SCO samples (P < 0.05). According to our results, the USP26 gene may play an important role in male reproduction. The alterations of this gene may be involved in male infertility and RPL in Iranian population and may negatively affect testicular function.

Social Capital and Value Creation: A Replication of ‘The Role of Intrafirm Networks’ by Wenpin Tsai and Sumantra Ghoshal

Social sciences researchers commend the scientists in the field of natural science for their history of replication and reproduction of scientific research. Such advocates for replication warn that business research is frequently built on a foundation that is ever evolving and necessitates the replicating of theoretical work. Following this logic, this paper is a replication of the celebrated 1998 article by Tsai and Ghoshal, Social capital and value creation: The role of intrafirm networks. Replication was conducted utilizing Structural Equation Modeling. The data was collected by the original researchers through a survey administered by mail. The survey comprised questions rated using a Likert scale. Findings mostly support Tsai and Ghoshal’s results with the exception of the relationships among constructs measuring trustworthiness, resource combination and sharing, and product innovation. Utilizing the before-mentioned constructs and the same analysis as Tsai and Ghoshal--structural equation modeling (SEM); the replicated model presented in this paper shows a non-recursive relationship versus Tsai and Ghoshal’s recursive model. All in all, we contend that the replicated model presented in this paper agrees with current literature and is a more comprehensive model than the one offered by Tsai and Ghoshal.

The early history of migration and settlement of Yemenis in Cardiff, 1939–1970: religion and ethnicity as social capital

Utilizing Putnam's concept of bonding social capital, this article explores the under-researched topic of the history of migrant men's reproduction of social capital in Cardiff, Wales. Drawing upon a series of oral history interviews with a respected imam of more than fifty years, and informed by existing research on Muslim migrants, we explore both the advantages and disadvantages of community relationships between Yemeni men in relation to trust, reciprocity and interpersonal well-being. By examining these complex bonds, this article contributes to the literature on religious and ethnic social networks by challenging the assumption that migrants always benefit from social resources (Wilson 1978; Shah 2007), and offers an alternative account of religiously underpinned social capital to those of studies of majority ethnic Christians in North America (Smidt 2003). Uniquely, this article also points to the divergences between religious and ethnic capitals in the context of Yemeni migrants' social resources during 1939–1970.

Imperfect sound forever: loudness wars, listening formations and the history of sound reproduction

AbstractThe purpose of this paper is to provide some historical perspective on the so-called loudness war. Critics of the loudness war maintain that the average volume level of popular music recordings has increased dramatically since the proliferation of digital technology in the 1980s, and that this increase has had detrimental effects on sound quality and the listening experience. My point is not to weigh in on this debate, but to suggest that the issue of loudness in sound recording and playback can be traced back much earlier than the 1980s. In fact, loudness has been a source of pleasure, a target of criticism, and an engine of technological change since the very earliest days of commercial sound reproduction. Looking at the period between the turn-of-the-century format feud and the arrival of electrical amplification in the 1920s, I situate the loudness war within a longer historical trajectory, and demonstrate a variety of ways in which loudness and volume have been controversial issues in – and constitutive elements of – the history of sound reproduction. I suggest that the loudness war can be understood in relation to a broader cultural history of volume.

Tardigrades (Tardigrada) in Baltic States

The tardigrades (Tardigrada), one of the micrometazoans groups, are reviewed. Tardigrades are distributed almost everywhere: in moss, lichens, soil, in niches of freshwater and seawater. The ability of tardigrades to undergo cryptobiosis has aroused interest among world scientists who would like to apply this mechanism to other biological systems that might benefit from dry storage in extreme conditions. This paper reviews the latest information on tardigrades taxonomy and phylogenetic position, distribution, some aspects of their biology, reproduction and life history. The present work also provides the data of research of tardigrades in the Baltic states.