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Sean C. Lema
California Polytechnic State University
52Publications
21H-index
1,543Citations
Publications 54
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Abstract The growth hormone (GH)/insulin-like growth factor (Igf) endocrine axis regulates somatic growth in the face of changing environmental conditions. In actinopterygian fishes, food availability is a key modulator of the somatotropic axis, with lower food intake generally depressing liver Igf1 release to diminish growth. Igf1 signaling, however, also involves several distinct IGF binding proteins (Igfbps), and the functional roles of many of these Igfbps in affecting growth during shifting...
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Abstract Explaining how populations adapt to environments is among the foremost objectives of evolutionary theory. Over generations, natural selection impels the phenotypic distribution of a population based on individual variation in phenotype and fitness. However, environmental conditions can also shape how individuals develop within their lifetime to influence which phenotypes are expressed in a population. It has been proposed that such environmentally-initiated phenotypic variation – also t...
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#1Sean C. Lema (California Polytechnic State University)H-Index: 21
#2Samantha L. Bock (California Polytechnic State University)
Last.Emma A. Elkins (California Polytechnic State University)H-Index: 1
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Poikilothermic organisms are predicted to show reduced body sizes as they experience warming environments under a changing global climate. Such a shrinking of size is expected under scenarios where...
1 CitationsSource
#1Nicole L. Hack (California Polytechnic State University)H-Index: 1
#2Kasey L. Cordova (California Polytechnic State University)
Last.Sean C. Lema (California Polytechnic State University)H-Index: 21
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Abstract Variation in food intake affects somatic growth by altering the expression of hormones in the somatotropic endocrine axis including insulin-like growth factor-1 (IGF-1). Here, we examined IGF-1 pathway responses to long- and short-term variation in food availability in copper rockfish (Sebastes caurinus), a nearshore Pacific rockfish important for commercial and recreational fisheries. Juvenile copper rockfish were raised under differing ration amounts (3% or 9% mass feed·g−1 fish wet m...
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#1Sean C. Lema (California Polytechnic State University)H-Index: 21
#2Elsie H. Washburn (California Polytechnic State University)H-Index: 1
Last.Stephen D. McCormick (USGS: United States Geological Survey)H-Index: 51
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The nonapeptide arginine vasotocin (AVT) regulates osmotic balance in teleost fishes, but its mechanisms of action are not fully understood. Recently, it was discovered that nonapeptide receptors i...
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#1Olivia H. Lewis (California Polytechnic State University)
#2Sean C. Lema (California Polytechnic State University)H-Index: 21
AbstractThe northern anchovy, Engraulis mordax, is a small planktivorous fish from the northeastern Pacific Ocean that is an important forage for fishes, birds, and marine mammals, and is also the target of a commercial fishery. Here, we assembled a complete 16,664 bp genome for the E. mordax mitochondrion, which encodes for 12S and 16S rRNAs, 22 tRNAs, 13 protein-coding genes, and a 1016 bp D-loop in the characteristic arrangement of Order Clupeiformes. Phylogenetic analysis confirmed the evolu...
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AbstractPupfishes (genus Cyprinodon) evolved some of the broadest salinity tolerances of teleost fishes, with some taxa surviving in conditions from freshwater to nearly 160 ppt. In this study, we examined transcriptional dynamics of ion transporters and aquaporins in the gill of the desert Amargosa pupfish (Cyprinodon nevadensis amargosae) during rapid salinity change. Pupfish acclimated to 7.5 ppt were exposed to freshwater (0.3 ppt), seawater (35 ppt), or hypersaline (55 ppt) conditions over ...
2 CitationsSource
#1Nicole L. Hack (California Polytechnic State University)H-Index: 1
#2Jackson S. Strobel (California Polytechnic State University)H-Index: 1
Last.Sean C. Lema (California Polytechnic State University)H-Index: 21
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Abstract Growth performance in vertebrates is regulated by environmental factors including the quality and quantity of food, which influence growth via endocrine pathways such as the growth hormone (GH)/insulin-like growth factor somatotropic axis. In several teleost fishes, circulating concentrations of insulin-like growth factor-1 (Igf1) correlate positively with growth rate, and it has been proposed that plasma Igf1 levels may serve as an indicator of growth variation for fisheries and aquacu...
3 CitationsSource
#1Frances L. Glaser (California Polytechnic State University)H-Index: 1
#2Kylie S. Owen (California Polytechnic State University)H-Index: 1
Last.Sean C. Lema (California Polytechnic State University)H-Index: 21
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AbstractThe Mohave tui chub (Siphateles bicolor mohavensis) is an endangered cyprinid fish endemic to the Mojave Desert region of southeastern California, USA. Here, we describe the complete 16,607 base pair (bp) mitochondrial genome of S. b. mohavensis. The mitogenome has a nucleotide base composition of A (29.08%), T (26.91%), G (17.58%), and C (26.43%), and encodes 13 protein subunits, 22 tRNAs, a 12S rRNA of 956 bp and 16S rRNA of 1691 bp, and a 929 bp D-loop control region, each located in ...
1 CitationsSource
#1Emma A. Elkins (California Polytechnic State University)H-Index: 1
#2Kayla A. Walti (California Polytechnic State University)H-Index: 2
Last.Sean C. Lema (California Polytechnic State University)H-Index: 21
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Abstract The vasotocin/vasopressin and isotocin/mesotocin/oxytocin family of nonapeptides regulate social behaviors and physiological functions associated with reproductive physiology and osmotic balance. While experimental and correlative studies provide evidence for these nonapeptides as modulators of behavior across all classes of vertebrates, mechanisms for nonapeptide inactivation in regulating these functions have been largely overlooked. Leucyl-cystinyl aminopeptidase (LNPEP) – also known...
3 CitationsSource
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