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Articles 1 - 9 of 9
Full-Text Articles in Life Sciences
Viability Costs Of Reproduction And Behavioral Compensation In Western Mosquitofish (Gambusia Affinis), Clinton T. Laidlaw, Jacob M. Condon, Mark C. Belk
Viability Costs Of Reproduction And Behavioral Compensation In Western Mosquitofish (Gambusia Affinis), Clinton T. Laidlaw, Jacob M. Condon, Mark C. Belk
Faculty Publications
The cost of reproduction hypothesis suggests that current reproduction has inherent tradeoffs with future reproduction. These tradeoffs can be both in the form of energy allocated to current offspring as opposed to somatic maintenance and future reproduction (allocation costs), or as an increase in mortality as a result of morphological or physiological changes related to reproduction (viability costs). Individuals may be able to decrease viability costs by altering behavior. Female western mosquitofish, Gambusia affinis experience a reduction in swimming ability as a consequence of pregnancy. We test for a viability cost of reproduction, and for behavioral compensation in pregnant female …
The Evolution Of Copulation Frequency And The Mechanisms Of Reproduction In Male Anolis Lizards, Michele A. Johnson, Maria Veronica Lopez, Tara K. Whittle, Bonnie K. Kircher, A K. Dill, Divina Varghese, J. Wade
The Evolution Of Copulation Frequency And The Mechanisms Of Reproduction In Male Anolis Lizards, Michele A. Johnson, Maria Veronica Lopez, Tara K. Whittle, Bonnie K. Kircher, A K. Dill, Divina Varghese, J. Wade
Biology Faculty Research
The evolution of many morphological structures is associated with the behavioral context of their use, particularly for structures involved in copulation. Yet, few studies have considered evolutionary relationships among the integrated suite of structures associated with male reproduction. In this study, we examined nine species of lizards in the genus Anolis to determine whether larger copulatory morphologies and higher potential for copulatory muscle performance evolved in association with higher copulation rates. In 10–12 adult males of each species, we measured the size of the hemipenes and related muscles, the seminiferous tubules in the testes, and the renal sex segments in …
Reproduction And Nesting In Teleost Fish, With A Focus On Reproduction In Centrarchids And Specific Analysis Of Nesting In Lepomis Megalotis, Rebecca Irene Allee
Reproduction And Nesting In Teleost Fish, With A Focus On Reproduction In Centrarchids And Specific Analysis Of Nesting In Lepomis Megalotis, Rebecca Irene Allee
Undergraduate Honors Thesis Collection
Fish represent the most diverse and oldest living class of vertebrates, making up approximately 48% of all known members of the subphylum Vertebrata (Bolis, et al. 2001). They are able to live in a wide variety of habitats, from salt water to fresh water and from cold polar seas to areas of intense pressure in the depths of the ocean (Moyle and Cech 1996). Because of this overwhelming diversity, the evolution and ecology of fishes has been a dynamic field of study (Moyle and Cech 1996). Researchers have generally divided fish into three distinct groups: jawless fishes (Class Agnatha), …
Life History Tradeoffs And The Costs Of Reproduction In Arizona Bark Scorpions (Centruroides Sculpturatus), Michael Marie Webber
Life History Tradeoffs And The Costs Of Reproduction In Arizona Bark Scorpions (Centruroides Sculpturatus), Michael Marie Webber
UNLV Theses, Dissertations, Professional Papers, and Capstones
Tradeoffs in life history evolution result from conflicts in the time and energy that can be simultaneously invested in activities such as growth, reproduction, and survival. Reproduction is an energetically costly activity for organisms, and is known to elicit alterations in the daily activity patterns of individuals. I investigated reproductive tradeoffs in the Arizona Bark Scorpion,Centruroides sculpturatus. To better understand the nature of tradeoffs in this species, I examined the influence of reproductive state on the predatory efficiency and thermal preference of reproductive females. Further, I examined the influence of reproductive activities (i.e. gestation) on the ability of reproductive females …
Variation In Arabidopsis Flowering Time Associated With Cis-Regulatory Variation In Constans, Ulises Rosas, Yu Mei, Qiguang Xie, Joshua A. Banta, Royce W. Zhou, Gabriela Seufferheld, Silvia Gerard, Lucy Chou, Naeha Bhambhra, Jennifer Deane Parks, Jonathan M. Flowers, C. Robertson Mcclung, Yoshie Hanzawa, Michael D. Purugganan
Variation In Arabidopsis Flowering Time Associated With Cis-Regulatory Variation In Constans, Ulises Rosas, Yu Mei, Qiguang Xie, Joshua A. Banta, Royce W. Zhou, Gabriela Seufferheld, Silvia Gerard, Lucy Chou, Naeha Bhambhra, Jennifer Deane Parks, Jonathan M. Flowers, C. Robertson Mcclung, Yoshie Hanzawa, Michael D. Purugganan
Dartmouth Scholarship
The onset of flowering, the change from vegetative to reproductive development, is a major life history transition in flowering plants. Recent work suggests that mutations in cis-regulatory mutations should play critical roles in the evolution of this (as well as other) important adaptive traits, but thus far there has been little evidence that directly links regulatory mutations to evolutionary change at the species level. While several genes have previously been shown to affect natural variation in flowering time in Arabidopsis thaliana, most either show protein-coding changes and/or are found at low frequency (<5%). Here we identify and characterize natural variation in the cis-regulatory sequence in the …
Variation In Arabidopsis Flowering Time Associated With Cis-Regulatory Variation In Constans, Ulises Rosas, Yu Mei, Qiguang Xie, Joshua A. Banta, Royce W. Zhou, Gabriela Seufferheld, Silvia Gerard, Lucy Chou, Naeha Bhambhra, Jennifer Deane Parks, Jonathon M. Flowers, C. Robertson Mcclung, Yoshie Hanzawa, Michael D. Purugganan
Variation In Arabidopsis Flowering Time Associated With Cis-Regulatory Variation In Constans, Ulises Rosas, Yu Mei, Qiguang Xie, Joshua A. Banta, Royce W. Zhou, Gabriela Seufferheld, Silvia Gerard, Lucy Chou, Naeha Bhambhra, Jennifer Deane Parks, Jonathon M. Flowers, C. Robertson Mcclung, Yoshie Hanzawa, Michael D. Purugganan
Biology Faculty Publications and Presentations
The onset of flowering, the change from vegetative to reproductive development, is a major life history transition in flowering plants. Recent work suggests that mutations in cis-regulatory mutations should play critical roles in the evolution of this (as well as other) important adaptive traits, but thus far there has been little evidence that directly links regulatory mutations to evolutionary change at the species level. While several genes have previously been shown to affect natural variation in flowering time in Arabidopsis thaliana, most either show protein-coding changes and/or are found at low frequency (o5%). Here we identify and characterize natural variation …
Assessing Multiple Endpoints Of Atrazine Ingestion On Gravid Northern Watersnakes (Nerodia Sipedon) And Their Offspring [Abstract], L. A. Neuman-Lee, K. F. Gaines, K. A. Baumgartner, J. R. Voorhees, J. M. Novak, Stephen J. Mullin
Assessing Multiple Endpoints Of Atrazine Ingestion On Gravid Northern Watersnakes (Nerodia Sipedon) And Their Offspring [Abstract], L. A. Neuman-Lee, K. F. Gaines, K. A. Baumgartner, J. R. Voorhees, J. M. Novak, Stephen J. Mullin
Faculty Publications
No abstract provided.
Reproductive Phase Determination In Male Meagre (Argyrosomus Regius, Sciaenidae): Testis Development And Histologic Corroboration Of A Gross Anatomical Scale, Nuno Prista, Leonel Gordo, José Lino Costa, Maria José Costa, Cynthia Jones
Reproductive Phase Determination In Male Meagre (Argyrosomus Regius, Sciaenidae): Testis Development And Histologic Corroboration Of A Gross Anatomical Scale, Nuno Prista, Leonel Gordo, José Lino Costa, Maria José Costa, Cynthia Jones
OES Faculty Publications
Reproductive stage determination of male gonads has received sparse attention in fish biology literature with few studies detailing the building of gross anatomical- and histologic scales. The meagre (Argyrosomus regius) is one of the world's largest sciaenids and supports a significant regional fishery in European and North African waters whose reproductive patterns are yet to be fully investigated. In the present study, we derive a macroscopic grading system for meagre testis using semi-quantitative graphs that feature the testis variability along the species size range and time of the year. We then describe the histological stages and reproductive phases of male …
Peripheral Administration Of Kisspeptin Antagonist Does Not Alter Basal Plasma Testosterone But Decreases Plasma Adiponectin Levels In Adult Male Rhesus Macaques, Tanzeel Huma, Farhad Ulla, Farnaz Hanif, Joshua D. Rizak, Muhammad Shahab
Peripheral Administration Of Kisspeptin Antagonist Does Not Alter Basal Plasma Testosterone But Decreases Plasma Adiponectin Levels In Adult Male Rhesus Macaques, Tanzeel Huma, Farhad Ulla, Farnaz Hanif, Joshua D. Rizak, Muhammad Shahab
Turkish Journal of Biology
Kisspeptin signaling is a potent regulator of the reproductive axis and an elicitor of gonadotropin-releasing hormone secretion. The present study assessed the effect of the peripheral administration of a kisspeptin antagonist (P234) on testosterone secretion in the adult male rhesus monkey. Five monkeys were administered with either P234 (38.8 µg/kg body weight) or a vehicle (0.9% saline). Plasma testosterone and adiponectin levels, as a positive control, were then measured using specific ELISA assays from blood samples collected sequentially at 15-min intervals from 60 min prior to until 360 min after the P234/vehicle injection. In 3 monkeys, the experiment was repeated …