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https://www.readbyqxmd.com/read/28095487/dna-metabarcoding-of-amazonian-ichthyoplankton-swarms
#1
M E Maggia, Y Vigouroux, J F Renno, F Duponchelle, E Desmarais, J Nunez, C García-Dávila, F M Carvajal-Vallejos, E Paradis, J F Martin, C Mariac
Tropical rainforests harbor extraordinary biodiversity. The Amazon basin is thought to hold 30% of all river fish species in the world. Information about the ecology, reproduction, and recruitment of most species is still lacking, thus hampering fisheries management and successful conservation strategies. One of the key understudied issues in the study of population dynamics is recruitment. Fish larval ecology in tropical biomes is still in its infancy owing to identification difficulties. Molecular techniques are very promising tools for the identification of larvae at the species level...
2017: PloS One
https://www.readbyqxmd.com/read/28091617/switch-from-sexual-to-parthenogenetic-reproduction-in-a-zebra-shark
#2
Christine L Dudgeon, Laura Coulton, Ren Bone, Jennifer R Ovenden, Severine Thomas
Parthenogenesis is a natural form of asexual reproduction in which embryos develop in the absence of fertilisation. Most commonly found in plants and invertebrate organisms, an increasing number of vertebrate species have recently been reported employing this reproductive strategy. Here we use DNA genotyping to report the first demonstration of an intra-individual switch from sexual to parthenogenetic reproduction in a shark species, the zebra shark Stegostoma fasciatum. A co-housed, sexually produced daughter zebra shark also commenced parthenogenetic reproduction at the onset of maturity without any prior mating...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28091580/population-expansions-dominate-demographic-histories-of-endemic-and-widespread-pacific-reef-fishes
#3
Erwan Delrieu-Trottin, Stefano Mona, Jeffrey Maynard, Valentina Neglia, Michel Veuille, Serge Planes
Despite the unique nature of endemic species, their origin and population history remain poorly studied. We investigated the population history of 28 coral reef fish species, close related, from the Gambier and Marquesas Islands, from five families, with range size varying from widespread to small-range endemic. We analyzed both mitochondrial and nuclear sequence data using neutrality test and Bayesian analysis (EBSP and ABC). We found evidence for demographic expansions for most species (24 of 28), irrespective of range size, reproduction strategy or archipelago...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28087301/molecular-characterization-and-quantification-of-estrogen-receptors-in-turbot-scophthalmus-maximus
#4
Peng Hu, Zheng Meng, Yudong Jia
Estrogens regulate various reproductive processes via estrogen receptor (ER)-mediated signaling pathway in vertebrates. In this study, full-length sequences coding for ERα, ERβ1 and ERβ2 were isolated from female turbot (Scophthalmus maximus) by homology cloning and a strategy based on rapid amplification of cDNA end-polymerase chain reaction (RACE-PCR). The nucleotide and amino acid sequences of turbot ERs showed high homologies with the corresponding sequences of other fish species and significant homology with the Japaenese flounder (Paralichthys olivaceus) and the European sea bass (Dicentrarchus labrax)...
January 10, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28077776/odour-based-discrimination-of-similarity-at-the-major-histocompatibility-complex-in-birds
#5
Sarah Leclaire, Maria Strandh, Jérôme Mardon, Helena Westerdahl, Francesco Bonadonna
Many animals are known to preferentially mate with partners that are dissimilar at the major histocompatibility complex (MHC) in order to maximize the antigen binding repertoire (or disease resistance) in their offspring. Although several mammals, fish or lizards use odour cues to assess MHC similarity with potential partners, the ability of birds to assess MHC similarity using olfactory cues has not yet been explored. Here we used a behavioural binary choice test and high-throughput-sequencing of MHC class IIB to determine whether blue petrels can discriminate MHC similarity based on odour cues alone...
January 11, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28077332/molecular-identification-of-star-and-3%C3%AE-hsd1-and-characterization-in-response-to-gnih-stimulation-in-protogynous-hermaphroditic-grouper-epinephelus-coioides
#6
Qingqing Wang, Xin Qi, Haipei Tang, Yin Guo, Shuisheng Li, Gaofei Li, Xiaoli Yang, Haifa Zhang, Xiaochun Liu, Haoran Lin
Gonadal steroids are critical factors in reproduction and sex reverse process. StAR (steroidogenic acute regulatory protein), transferring the cholesterol from the outer mitochondrial membrane to the inner membrane, is the rate-limiting factor of steroidogenesis. 3βHSD (3β-hydroxysteroid dehydrogenase/Δ5-Δ4 isomerase), converting Δ5-steroids into Δ4-steroids, is an important oxidoreductase in steroidogenesis. In the present study, StAR and 3βHSD1 were cloned and characterized from protogynous orange-spotted grouper...
January 8, 2017: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
https://www.readbyqxmd.com/read/28073385/the-cestode-parasite-schistocephalus-pungitii-castrator-or-nutrient-thief-of-ninespine-stickleback-fish
#7
David C Heins
In this investigation, the host-parasite relationship of ninespine stickleback fish Pungitius pungitius and the cestode parasite Schistocephalus pungitii was studied using samples from Dog Bone Lake, Kenai Peninsula, Alaska, to test the hypothesis that S. pungitii is a castrator of ninespine stickleback. Infected, adult females of all sizes (ages) were capable of producing clutches of eggs. S. pungitii had a negative effect on the ability of host females to produce a clutch, which was related to increasing parasite:host mass ratio (parasite index, PI)...
January 11, 2017: Parasitology
https://www.readbyqxmd.com/read/28070278/entanglement-is-a-costly-life-history-stage-in-large-whales
#8
Julie van der Hoop, Peter Corkeron, Michael Moore
Individuals store energy to balance deficits in natural cycles; however, unnatural events can also lead to unbalanced energy budgets. Entanglement in fishing gear is one example of an unnatural but relatively common circumstance that imposes energetic demands of a similar order of magnitude and duration of life-history events such as migration and pregnancy in large whales. We present two complementary bioenergetic approaches to estimate the energy associated with entanglement in North Atlantic right whales, and compare these estimates to the natural energetic life history of individual whales...
January 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28065674/mitochondria-in-teleost-spermatozoa
#9
REVIEW
Patricio Ulloa-Rodríguez, Elías Figueroa, Rommy Díaz, Manuel Lee-Estevez, Stefania Short, Jorge G Farías
There is an extraordinary diversity of reproductive modes in teleost and this variability is related to the phylogenetic relationships and adaption to very different biotopes. As in all vertebrates, sperm is produced as the end product of the process of spermatogenesis, and regarding teleost the spermatozoa lack an acrosome in almost all species and motility is activated as a response to osmolarity and ion content of the aquatic medium where the sperm is released. In this context, mitochondria possess a fundamental role for fish spermatozoa motility and integrity, hence, fertilizing potential; they are the energy supplier that allows flagellar movement and their dysfunction could play a main role in structural and functional damage to the spermatozoa...
January 5, 2017: Mitochondrion
https://www.readbyqxmd.com/read/28065551/unsustainable-human-induced-injuries-to-the-critically-endangered-taiwanese-humpback-dolphins-sousa-chinensis-taiwanensis
#10
John Y Wang, Kimberly N Riehl, Shih Chu Yang, Claryana Araújo-Wang
The Critically Endangered Taiwanese humpback dolphin (Sousa chinensis taiwanensis) is endemic to inshore and estuarine waters of central western Taiwan. It numbers fewer than 75 individuals, is declining and faces a myriad of human threats. Data from a long-term photo-identification program on these dolphins allowed major injuries to be examined quantitatively. A large proportion (57.7%) of individuals had suffered major human-induced injuries that likely compromised their health, survivorship or reproductive potential and thus, the future of this subspecies...
January 5, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28064479/scaling-up-endocrine-disruption-effects-from-individuals-to-populations-outcomes-depend-on-how-many-males-a-population-needs
#11
J Wilson White, Bryan J Cole, Gary N Cherr, Richard Edward Connon, Susanne M Brander
Assessing how endocrine disrupting compounds (EDCs) affect population dynamics requires tracking males and females (and sex-reversed individuals) separately. A key component in any sex-specific model is the 'mating function' (the relationship between sex ratio and reproductive success) but this relationship is not known for any fish species. Using a model, we found that EDC effects on fish populations strongly depend upon the shape of the mating function. Additionally, masculinization is generally more detrimental to populations than feminization...
January 9, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28057833/cognitive-skills-and-the-evolution-of-social-systems
#12
REVIEW
Russell D Fernald
How do animal social skills influence evolution? Complex animal social behaviors require many cognitive skills including individual recognition and observational learning. For social systems to evolve, these abilities need to be transmitted genetically or culturally and supported by the evolution of underlying neural systems. Because animal skill sets are so varied, it seems best to describe animal cognitive behaviors as being a social calculus that can change with experience, which has evolved to match and facilitate the complexity of the social system where it arose...
January 1, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28056063/comparative-study-of-reproductive-development-in-wild-and-captive-reared-greater-amberjack-seriola-dumerili-risso-1810
#13
Rosa Zupa, Covadonga Rodríguez, Constantinos C Mylonas, Hanna Rosenfeld, Ioannis Fakriadis, Maria Papadaki, José A Pérez, Chrysovalentinos Pousis, Gualtiero Basilone, Aldo Corriero
The greater amberjack Seriola dumerili is a large teleost fish with rapid growth and excellent flesh quality, whose domestication represents an ambitious challenge for aquaculture. The occurrence of reproductive dysfunctions in greater amberjack reared in captivity was investigated by comparing reproductive development of wild and captive-reared individuals. Wild and captive-reared breeders were sampled in the Mediterranean Sea during three different phases of the reproductive cycle: early gametogenesis (EARLY, late April-early May), advanced gametogenesis (ADVANCED, late May-early June) and spawning (SPAWNING, late June-July)...
2017: PloS One
https://www.readbyqxmd.com/read/28052500/fishing-induced-changes-in-adult-length-are-mediated-by-skipped-spawning
#14
Hui-Yu Wang, Ying-Shiuan Chen, Chien-Chung Hsu, Sheng-Feng Shen
Elucidating fishing effects on fish population dynamics is a critical step toward sustainable fisheries management. Despite previous studies that have suggested age or size truncation in exploited fish populations, other aspects of fishing effects on population demography, e.g., via altering life histories and density, have received less attention. Here, we investigated the fishing effects altering adult demography via shifting reproductive trade-offs in the iconic, overexploited, Pacific bluefin tuna Thunnus orientalis...
January 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28051944/glucocorticoids-in-fish-eggs-variation-interactions-with-the-environment-and-the-potential-to-shape-offspring-fitness
#15
N M Sopinka, P M Capelle, C A D Semeniuk, O P Love
Wild and captive vertebrates face multiple stressors that all have the potential to induce chronic maternal stress (i.e., sustained, elevated plasma glucocorticoids), resulting in embryo exposure to elevated maternally derived glucocorticoids. In oviparous taxa such as fish, maternally derived glucocorticoids in eggs are known for their capacity to shape offspring phenotype. Using a variety of methodologies, scientists have quantified maternally derived levels of egg cortisol, the primary glucocorticoid in fishes, and examined the cascading effects of egg cortisol on progeny phenotype...
January 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/28051942/parental-care-in-a-stressful-world-experimentally-elevated-cortisol-and-brood-size-manipulation-influence-nest-success-probability-and-nest-tending-behavior-in-a-wild-teleost-fish
#16
Dirk A Algera, Lee F G Gutowsky, Aaron J Zolderdo, Steven J Cooke
Parental care is an advantageous reproductive behavior, as the fitness of the caregiver is increased through improving the chances of its offspring's survival. Parental care occurs in a variety of teleost fishes. The body size of parental fish and the size of their brood can affect nest abandonment decisions, where compared with smaller fish with smaller broods, larger fish with larger broods typically invest more energy into reproductive events because they have less future reproductive potential. Although essential for basal metabolism and body maintenance functions, when glucocorticoid hormones (e...
January 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/28040262/environmental-impact-of-estrogens-on-human-animal-and-plant-life-a-critical-review
#17
REVIEW
Muhammad Adeel, Xiaoming Song, Yuanyuan Wang, Dennis Francis, Yuesuo Yang
BACKGROUND: Since the inception of global industrialization, steroidal estrogens have become an emerging and serious concern. Worldwide, steroid estrogens including estrone, estradiol and estriol, pose serious threats to soil, plants, water resources and humans. Indeed, estrogens have gained notable attention in recent years, due to their rapidly increasing concentrations in soil and water all over the world. Concern has been expressed regarding the entry of estrogens into the human food chain which in turn relates to how plants take up and metabolism estrogens...
December 28, 2016: Environment International
https://www.readbyqxmd.com/read/28030789/the-ssri-fluoxetine-exhibits-mild-effects-on-the-reproductive-axis-in-the-cichlid-fish-cichlasoma-dimerus-teleostei-cichliformes
#18
Luciana S Dorelle, Rodrigo H Da Cuña, Graciela Rey Vázquez, Christian Höcht, Akio Shimizu, Griselda Genovese, Fabiana L Lo Nostro
Among the wide variety of pharmaceuticals released into the environment, Fluoxetine (FLX), a selective serotonin reuptake inhibitor, is one of the most prescribed for the treatment of major depression. It inhibits serotonin (5-HT) reuptake at the presinaptic membrane, increasing serotonergic activity. In vertebrates, including fish, the serotonergic system is closely related to the Hypothalamic Pituitary Gonadal (HPG) axis which regulates reproduction. As FLX can act as an endocrine disrupting compound (EDC) by affecting several reproductive parameters in fish, the aim of this study was to provide an integral assessment of the potential effect of FLX on the reproductive axis of the Neotropical freshwater fish Cichlasoma dimerus...
December 25, 2016: Chemosphere
https://www.readbyqxmd.com/read/28007837/the-impact-of-open-pollination-on-the-structural-evolutionary-dynamics-meiotic-behavior-and-fertility-of-resynthesized-allotetraploid-brassica-napus-l
#19
Mathieu Rousseau-Gueutin, Jérôme Morice, Olivier Coriton, Virginie Huteau, Gwenn Trotoux, Sylvie Nègre, Cyril Falentin, Gwennaëlle Deniot, Marie Gilet, Frédérique Eber, Alexandre Pelé, Sonia Vautrin, Joëlle Fourment, Maryse Lodé, Hélène Bergès, Anne-Marie Chèvre
Allopolyploidy, which results from the merger and duplication of two divergent genomes, has played a major role in the evolution and diversification of flowering plants. The genomic changes that occur in resynthesized or natural neopolyploids have been extensively studied, but little is known about the effects of the reproductive mode in the initial generations that may precede its successful establishment. To truly reflect the early generations of a nascent polyploid, two resynthesized allotetraploid Brassica napus populations were obtained for the first time by open pollination...
December 22, 2016: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28007836/single-locus-maintains-large-variation-of-sex-reversal-in-half-smooth-tongue-sole-cynoglossus-semilaevis
#20
Li Jiang, Hengde Li
Sex determination is a fundamental biological process for individual sex development and population sex ratios. However, for some species, the primary sex might be altered during development, and individuals can develop into the opposite sex. Sex reversal may happenin insects, reptiles, amphibians, and fishes. In half-smooth tongue sole (Cynoglossus semilaevis), some genetically female fish irreversibly reverse to pseudo-males, resulting in higher costs in aquaculture owing to a lower growth rate of male fish during a two-year growth period...
December 22, 2016: G3: Genes—Genomes—Genetics
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