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https://www.readbyqxmd.com/read/27485274/population-genomics-reveals-multiple-drivers-of-population-differentiation-in-a-sex-role-reversed-pipefish
#1
Sarah P Flanagan, Emily Rose, Adam G Jones
A major goal of molecular ecology is to identify the causes of genetic and phenotypic differentiation among populations. Population genomics is suitably poised to tackle these key questions by diagnosing the evolutionary mechanisms driving divergence in nature. Here, we set out to investigate the evolutionary processes underlying population differentiation in the Gulf pipefish, Syngnathus scovelli. We sampled approximately 50 fish from each of 12 populations distributed from the Gulf coast of Texas to the Atlantic coast of Florida and performed restriction-site-associated DNA sequencing to identify SNPs throughout the genome...
October 2016: Molecular Ecology
https://www.readbyqxmd.com/read/26448558/the-effects-of-synthetic-estrogen-exposure-on-the-sexually-dimorphic-liver-transcriptome-of-the-sex-role-reversed-gulf-pipefish
#2
Emily Rose, Sarah P Flanagan, Adam G Jones
Species exhibiting sex-role reversal provide an unusual perspective on the evolution of sex roles and sex differences. However, the proximate effects of sex-role reversal are largely unknown. Endocrine disruptors provide an experimental mechanism to address hormonal regulation of sexually dimorphic gene expression in sex-role-reversed taxa. Here, we investigate gene expression patterns in the liver of the sex-role-reversed Gulf pipefish, because the liver is known to be sexually dimorphic and estrogen-regulated in species with conventional sex roles...
2015: PloS One
https://www.readbyqxmd.com/read/25970284/the-effects-of-food-limitation-on-life-history-tradeoffs-in-pregnant-male-gulf-pipefish
#3
Kimberly A Paczolt, Adam G Jones
Syngnathid fishes (pipefishes, seahorses and seadragons) are characterized by a unique mode of paternal care in which embryos develop on or in the male's body, often within a structure known as a brood pouch. Evidence suggests that this pouch plays a role in mediating postcopulatory sexual selection and that males have some control over the events occurring within the pouch during the pregnancy. These observations lead to the prediction that males should invest differently in broods depending on the availability of food...
2015: PloS One
https://www.readbyqxmd.com/read/25292365/sexual-selection-on-female-ornaments-in-the-sex-role-reversed-gulf-pipefish-syngnathus-scovelli
#4
S P Flanagan, J B Johnson, E Rose, A G Jones
Understanding how selection acts on traits individually and in combination is an important step in deciphering the mechanisms driving evolutionary change, but for most species, and especially those in which sexual selection acts more strongly on females than on males, we have no estimates of selection coefficients pertaining to the multivariate sexually selected phenotype. Here, we use a laboratory-based mesocosm experiment to quantify pre- and post-mating selection on female secondary sexual traits in the Gulf pipefish (Syngnathus scovelli), a sexually dimorphic, sex-role-reversed species in which ornamented females compete for access to choosy males...
November 2014: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/24478798/the-effects-of-synthetic-estrogen-exposure-on-premating-and-postmating-episodes-of-selection-in-sex-role-reversed-gulf-pipefish
#5
Emily Rose, Kimberly A Paczolt, Adam G Jones
Environmental estrogens have been shown to affect populations of aquatic organisms in devastating ways, including feminization of males, alterations in mating behaviors, and disruption of sexual selection. Studies have shown 17α-ethinylestradiol (EE2) exposure to induce female-like secondary sexual traits in male Gulf pipefish, changing how females perceive affected males. We aimed to understand the effects of EE2 exposure on the sex-role-reversed mating system and the strength of selection in Gulf pipefish...
December 2013: Evolutionary Applications
https://www.readbyqxmd.com/read/24324861/functional-similarity-and-molecular-divergence-of-a-novel-reproductive-transcriptome-in-two-male-pregnant-syngnathus-pipefish-species
#6
Clayton M Small, April D Harlin-Cognato, Adam G Jones
Evolutionary studies have revealed that reproductive proteins in animals and plants often evolve more rapidly than the genome-wide average. The causes of this pattern, which may include relaxed purifying selection, sexual selection, sexual conflict, pathogen resistance, reinforcement, or gene duplication, remain elusive. Investigative expansions to additional taxa and reproductive tissues have the potential to shed new light on this unresolved problem. Here, we embark on such an expansion, in a comparison of the brood-pouch transcriptome between two male-pregnant species of the pipefish genus Syngnathus...
October 2013: Ecology and Evolution
https://www.readbyqxmd.com/read/23933729/the-contributions-of-premating-and-postmating-selection-episodes-to-total-selection-in-sex-role-reversed-gulf-pipefish
#7
Emily Rose, Kimberly A Paczolt, Adam G Jones
Empirical studies of sexual selection often focus on events occurring either before or after mating but rarely both and consequently may fail to discern the relative magnitudes and interactions of premating and postmating episodes of selection. Here, we simultaneously quantify premating and postmating selection in the sex-role-reversed Gulf pipefish by using a microsatellite-based analysis of parentage in experimental populations. Female pipefish exhibited an opportunity for selection (I) of 1.64, which was higher than that of males (0...
September 2013: American Naturalist
https://www.readbyqxmd.com/read/23125411/population-structure-of-the-gulf-pipefish-in-and-around-mobile-bay-and-the-northern-gulf-of-mexico
#8
Charlyn Partridge, Anne Boettcher, Adam G Jones
The genetic structure of inshore aquatic populations can be influenced by a number of factors, including coastal configurations, flow rates, and local adaptation. Properties such as salinity and temperature can differ significantly along the coasts and into the bays and rivers that contribute to these systems. Within these environments, low migratory euryhaline species provide a unique system to examine how these factors influence population structure, even when these populations are continuously distributed...
November 2012: Journal of Heredity
https://www.readbyqxmd.com/read/21898201/acanthocephaloides-irregularis-n-sp-acanthocephala-arhythmacanthidae-from-marine-fishes-off-the-ukrainian-black-sea-coast
#9
Omar M Amin, Mehmet C Oğuz, Richard A Heckmann, Yahya Tepe, Yuriy Kvach
Acanthocephaloides irregularis n. sp. (Arhythmacanthidae) is described from four species of marine fishes in the Gulf of Odessa and Sukhyi Lyman, Ukrainan Black Sea waters, making it the tenth species of the genus. The hosts are the combtooth blenny Parablennius zvonimiri (Kolombatovic) (Blenniidae), the mushroom goby Ponticola eurycephalus (Kessler) (Gobiidae), the tubenose goby Proterorhinus marmoratus (Pallas) (Gobiidae) and the black-striped pipefish Syngnathus abaster Risso (Syngnathidae). The new species is most similar to its closest relative, Acanthocephaloides propinquus (Dujardin, 1845), in proboscis shape and armature (12 longitudinal rows of 5 hooks) and the shape of the trunk, reproductive system and lemnisci, but differs in having randomly distributed trunk spines...
October 2011: Systematic Parasitology
https://www.readbyqxmd.com/read/20739960/evidence-for-male-allocation-in-pipefish
#10
COMMENT
Darryl T Gwynne, Kevin A Judge, Clint D Kelly
Sexual differences in the extent and type of parental care lie at the heart of sexual selection theory, and evolution resulting from parental conflict has produced some striking behavioural and morphological adaptations. In a study of male pregnancy in Gulf pipefish, Paczolt and Jones showed that more eggs were transferred to the male's brood pouch and more offspring survived following mating with large females (preferred by males) than with small (less preferred) females. Although the authors conclude that the lower survival of embryos from small females is most consistent with males actively removing resources from these offspring, no data are presented to directly support this hypothesis (ref...
August 26, 2010: Nature
https://www.readbyqxmd.com/read/20708009/short-term-exposure-to-a-synthetic-estrogen-disrupts-mating-dynamics-in-a-pipefish
#11
Charlyn Partridge, Anne Boettcher, Adam G Jones
Sexual selection is responsible for the evolution of some of the most elaborate traits occurring in nature, many of which play a vital role in competition over access to mates and individual reproductive fitness. Because expression of these traits is typically regulated by sex-steroids there is a significant potential for their expression to be affected by the presence of certain pollutants, such as endocrine disrupting compounds. Endocrine disruptors have been shown to alter primary sexual traits and impact reproduction, but few studies have investigated how these compounds affect secondary sexual trait expression and how that may, in turn, impact mating dynamics...
November 2010: Hormones and Behavior
https://www.readbyqxmd.com/read/20237568/post-copulatory-sexual-selection-and-sexual-conflict-in-the-evolution-of-male-pregnancy
#12
Kimberly A Paczolt, Adam G Jones
Male pregnancy in seahorses, pipefishes and sea dragons (family Syngnathidae) represents a striking reproductive adaptation that has shaped the evolution of behaviour and morphology in this group of fishes. In many syngnathid species, males brood their offspring in a specialized pouch, which presumably evolved to facilitate male parental care. However, an unexplored possibility is that brood pouch evolution was partly shaped by parent-offspring or sexual conflict, processes that would result in trade-offs between current and future pregnancies...
March 18, 2010: Nature
https://www.readbyqxmd.com/read/19378392/opening-pandora-s-box-comparative-studies-of-genetic-mating-systems-reveal-reproductive-complexity
#13
REVIEW
Anthony B Wilson
Genetic analyses of realized reproductive success have fundamentally changed our understanding of mating behaviour in natural systems. While behavioural ecologists have long been interested in what factors influence mating behaviour, early studies were limited to direct observations of matings and thus provided an incomplete picture of reproductive activity. Genetic assessments of parentage have revolutionized the study of reproductive behaviour, revealing that many individuals engage in extra-pair copulations (Griffith et al...
April 2009: Molecular Ecology
https://www.readbyqxmd.com/read/19368649/environmental-demographic-and-genetic-mating-system-variation-among-five-geographically-distinct-dusky-pipefish-syngnathus-floridae-populations
#14
Kenyon B Mobley, Adam G Jones
Genetic mating systems are expected to vary among and within populations in response to environmental and demographic factors. Despite the fact that mating system variation theoretically can have profound effects on important evolutionary processes such as sexual selection, extensive intraspecific surveys of geographical variation in mating systems are rare. We used microsatellite markers to characterize genetic mating systems of dusky pipefish, Syngnathus floridae, from five populations distributed from the mid-Atlantic Coast to the Western Gulf of Mexico...
April 2009: Molecular Ecology
https://www.readbyqxmd.com/read/17561916/geographical-variation-in-the-mating-system-of-the-dusky-pipefish-syngnathus-floridae
#15
COMPARATIVE STUDY
K B Mobley, A G Jones
Differences among populations in the intensity of sexual selection resulting from distinct genetic mating systems can lead to divergent morphological evolution and speciation. However, little is known about how genetic mating systems vary between populations and what factors may contribute to this variation. In this study, we compare the genetic mating systems of two geographically distinct populations of the dusky pipefish (Syngnathus floridae), a species characterized by polygynandry and male pregnancy, from the Atlantic Coast of Virginia and the Gulf Coast of Florida...
June 2007: Molecular Ecology
https://www.readbyqxmd.com/read/17398130/osmoregulatory-role-of-the-brood-pouch-in-the-euryhaline-gulf-pipefish-syngnathus-scovelli
#16
Charlyn Partridge, Judith Shardo, Anne Boettcher
Many species of pipefish exhibit a reversal of parental roles, in which females insert eggs into the brood pouch of the male where they are incubated until the end of embryonic development. While the significance of the male brood pouch has been examined for over a century, the role of the pouch is still unclear. One possible function is to aid in osmoregulation by buffering embryos from the external environment. To investigate this role, the euryhaline Gulf pipefish, Syngnathus scovelli, was collected and maintained in either a low salinity or a saltwater environment...
June 2007: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/16610331/male-pregnancy-and-the-evolution-of-body-segmentation-in-seahorses-and-pipefishes
#17
Eric A Hoffman, Kenyon B Mobley, Adam G Jones
The evolution of complex traits, which are specified by the interplay of multiple genetic loci and environmental effects, is a topic of central importance in evolutionary biology. Here, we show that body and tail vertebral numbers in fishes of the pipefish and seahorse family (Syngnathidae) can serve as a model for studies of quantitative trait evolution. A quantitative genetic analysis of body and tail vertebrae from field-collected families of the Gulf pipefish, Syngnathus scovelli, shows that both traits exhibit significantly positive additive genetic variance, with heritabilities of 0...
February 2006: Evolution; International Journal of Organic Evolution
https://www.readbyqxmd.com/read/16158862/effects-of-an-environmental-estrogen-on-male-gulf-pipefish-syngnathus-scovelli-evermann-and-kendall-a-male-brooding-teleost
#18
N Ueda, C Partridge, J Bolland, J Hemming, T Sherman, A Boettcher
No abstract text is available yet for this article.
June 2005: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/11749706/genetic-evidence-for-extreme-polyandry-and-extraordinary-sex-role-reversal-in-a-pipefish
#19
A G Jones, D Walker, J C Avise
Due to the phenomenon of male pregnancy, the fish family Syngnathidae (seahorses and pipefishes) has historically been considered an archetypal example of a group in which sexual selection should act more strongly on females than on males. However, more recent work has called into question the idea that all species with male pregnancy are sex-role reversed with respect to the intensity of sexual selection. Furthermore, no studies have formally quantified the opportunity for sexual selection in any natural breeding assemblage of pipefishes or seahorses in order to demonstrate conclusively that sexual selection acts most strongly on females...
December 22, 2001: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/9076975/microsatellite-analysis-of-maternity-and-the-mating-system-in-the-gulf-pipefish-syngnathus-scovelli-a-species-with-male-pregnancy-and-sex-role-reversal
#20
A G Jones, J C Avise
Highly variable microsatellite loci were employed to study the mating system of the sexually dimorphic Gulf pipefish Syngnathus scovelli. In this species, like others in the family Syngnathidae, 'pregnant' males provide all parental care. Gulf pipefish were collected from one locale in the northern Gulf of Mexico, and internally carried broods of 40 pregnant males were analysed genetically. By comparing multilocus microsatellite fingerprints for the inferred mothers against expected genotypic distributions from the population sample, it was determined that: (i) only one male had received eggs from more than a single female; and (ii) on two separate occasions, two different males had received eggs from the same female...
March 1997: Molecular Ecology
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