Publications

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the adaptive response of protein turnover to the energetic demands of reproduction in a cephalopod.sourcing energy for reproduction is a major driver of the life-history characteristics of animals. unlike other molluscs, cephalopods do not appear to have significant glycogen stores, and energy is either sourced directly from ingested food or mobilized from protein stores in the muscle. given the importance of protein to cephalopods, this study quantified changes in protein turnover in the muscle tissue in reproductively immature and maturing/mature individuals. quantifying protein accretion a ...201223303326
transcriptome analysis of the white body of the squid euprymna tasmanica with emphasis on immune and hematopoietic gene discovery.in the mutualistic relationship between the squid euprymna tasmanica and the bioluminescent bacterium vibrio fischeri, several host factors, including immune-related proteins, are known to interact and respond specifically and exclusively to the presence of the symbiont. in squid and octopus, the white body is considered to be an immune organ mainly due to the fact that blood cells, or hemocytes, are known to be present in high numbers and in different developmental stages. hence, the white body ...201525775132
multiple fitness benefits of polyandry in a cephalopod.sex differences in reproductive investment play a crucial role in sexual conflict. one intriguing aspect of sexual conflict is the evolution of female multiple mating (polyandry), particularly in systems where females receive no obvious direct benefits from males, and where mating is highly costly. here, theory predicts that polyandrous females can increase their reproductive success by taking advantage of the genetic benefits of mating with multiple males. cephalopods provide a model system for ...201222615896
the energetic cost of mating in a promiscuous cephalopod.costs that individuals incur through mating can play an important role in understanding the evolution of life histories and senescence, particularly in promiscuous species. copulation costs, ranging from energy expenditure to reduced longevity, are widely studied in insects but have received substantially less attention in other taxa. one cost of mating, the energetic cost, is poorly studied across all taxa despite its potential importance for the many species where copulation is physically dema ...201222809722
gene-swapping mediates host specificity among symbiotic bacteria in a beneficial symbiosis.environmentally acquired beneficial associations are comprised of a wide variety of symbiotic species that vary both genetically and phenotypically, and therefore have differential colonization abilities, even when symbionts are of the same species. strain variation is common among conspecific hosts, where subtle differences can lead to competitive exclusion between closely related strains. one example where symbiont specificity is observed is in the sepiolid squid-vibrio mutualism, where compet ...201425014649
does predation risk affect mating behavior? an experimental test in dumpling squid (euprymna tasmanica).one of the most important trade-offs for many animals is that between survival and reproduction. this is particularly apparent when mating increases the risk of predation, either by increasing conspicuousness, reducing mobility or inhibiting an individual's ability to detect predators. individuals may mitigate the risk of predation by altering their reproductive behavior (e.g. increasing anti-predator responses to reduce conspicuousness). the degree to which individuals modulate their reproducti ...201425551378
single and multiple mating reduces longevity of female dumpling squid (euprymna tasmanica).for many species, mating is a necessary yet costly activity. the costs involved can have an important influence on the evolution of life histories and senescence. females of many species mate multiply, and this behaviour can inflict a longevity cost. most studies investigating the effects of multiple mating on female survival have been conducted on insects, and the effects in other taxa are largely unknown. we investigate the effects of both a single mating and a second mating on longevity in fe ...201728278369
multiple vibrio fischeri genes are involved in biofilm formation and host colonization.biofilms are increasingly recognized as being the predominant form for survival for most bacteria in the environment. the successful colonization of vibrio fischeri in its squid host euprymna tasmanica involves complex microbe-host interactions mediated by specific genes that are essential for biofilm formation and colonization. here, structural and regulatory genes were selected to study their role in biofilm formation and host colonization. we have mutated several genes (pilt, pilu, flgf, moty ...201222486781
ecological diversification of vibrio fischeri serially passaged for 500 generations in novel squid host euprymna tasmanica.vibrio fischeri isolated from euprymna scolopes (cephalopoda: sepiolidae) was used to create 24 lines that were serially passaged through the non-native host euprymna tasmanica for 500 generations. these derived lines were characterized for biofilm formation, swarming motility, carbon source utilization, and in vitro bioluminescence. phenotypic assays were compared between "es" (e. scolopes) and "et" (e. tasmanica) v. fischeri wild isolates to determine if convergent evolution was apparent betwe ...201424402368
characterization of  two host-specific genes, mannose-sensitive hemagglutinin (msha) and uridyl phosphate dehydrogenase (udpdh) that are involved in the vibrio fischeri-euprymna tasmanica mutualism.while much has been known about the mutualistic associations between the sepiolid squid euprymna tasmanica and the luminescent bacterium, vibrio fischeri, less is known about the connectivity between the microscopic and molecular basis of initial attachment and persistence in the light organ. here, we examine the possible effects of two symbiotic genes on specificity and biofilm formation of v. fischeri in squid light organs. uridine diphosphate glucose-6-dehydrogenase (udpdh) and mannose-sensit ...200919686342
protein synthesis in a solitary benthic cephalopod, the southern dumpling squid (euprymna tasmanica).rates of protein synthesis were measured in the whole body and tissues of southern dumpling squid euprymna tasmanica to validate the use of a flooding-dose of (3)h phenylalanine for the measurement of protein synthesis with different size squid and to make a preliminary investigation into the effects of feeding regime. in smaller (2.8+/-0.5 g, mean+/-se) and larger (14.8+/-2.2 g) squid whole body fractional rates of protein synthesis were 9.45+/-1.21 and 1.49+/-0.29% d(-1), respectively. differe ...200919223018
heritability and fitness-related consequences of squid personality traits.dumpling squid, euprymna tasmanica, show consistent individual differences in behaviour that can be classified according to indices reflecting shy-bold, activity and reactivity responses. using crosses of wild-caught single males to multiple females with known behavioural phenotypes, this study estimated patterns of additive genetic and residual variance in these behavioural traits from offspring of squid in two contexts, a threat (antipredator) and feeding (foraging) test. genetic contributions ...200616910975
personality traits in dumpling squid (euprymna tasmanica): context-specific traits and their correlation with biological characteristics.personality traits are a major class of behavioral variation often observed within populations of animals. however, little is known of the integration between personality and an individual's underlying biology. to address this, the authors measured personality traits in squid (euprymna tasmanica) in 2 contexts while also describing trait correlates with biological parameters. four traits (shy avoidance- bold aggression, activity, bury persistence, and reactivity) were reliably measured; however, ...200515740434
contribution of pila to competitive colonization of the squid euprymna scolopes by vibrio fischeri.vibrio fischeri colonizes the squid euprymna scolopes in a mutualistic symbiosis. hatchling squid lack these bacterial symbionts, and v. fischeri strains must compete to occupy this privileged niche. we cloned a v. fischeri gene, designated pila, that contributes to colonization competitiveness and encodes a protein similar to type iv-a pilins. unlike its closest known relatives, vibrio cholerae msha and vcfa, pila is monocistronic and not clustered with genes associated with pilin export or ass ...200312571000
protein synthesis, degradation, and retention: mechanisms of indeterminate growth in cephalopods.this study is the first to examine the underlying process of growth in a cephalopod, the southern dumpling squid (euprymna tasmanica), to ascertain the mechanism by which indeterminate growth is achieved in this live-fast, die-young group of animals. this is the first study to estimate rates of protein synthesis and growth of squid from 7 to 140 d of age, providing an understanding of both the pattern and the process of growth throughout the lifetime of a squid species. younger and smaller indiv ...201020979497
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