| alternate spore stages of myxobilatus gasterostei, a myxosporean parasite of three-spined sticklebacks (gasterosteus aculeatus) and oligochaetes (nais communis). | two spore stages in the life cycle of myxobilatus gasterostei, a ubiquitous myxosporean parasite of three-spined sticklebacks, were identified by matching small subunit ribosomal rna gene sequences of actinospores from a worm with myxospores from fish. a nais communis oligochaete collected in the willamette river, oregon, usa was found to produce a triactinomyxon-type actinospore which was distinguishable from previous records by its large size (approximately 500 microm across) and number of ger ... | 2009 | 19107523 |
| latitudinal variation in photoperiodic response of the three-spined stickleback gasterosteus aculeatus in western north america. | reproductive maturation in both male and female three-spined stickleback gasterosteus aculeatus was strongly photoperiodic in a northern population (alaska, 61 degrees n) but not in a southern population (oregon, 43 degrees n) from western north america. increasing reliance on photoperiod with increasing latitude is a general phenomenon among vertebrates, and is probably due to the anticipation of a narrower window of opportunity for reproduction and development at higher latitudes. | 2009 | 20738673 |
| geography of the circadian gene clock and photoperiodic response in western north american populations of the three-spined stickleback gasterosteus aculeatus. | controlled laboratory experiments were used to show that oregon and alaskan three-spined stickleback gasterosteus aculeatus, collected from locations differing by 18° of latitude, exhibited no significant variation in length of the polyglutamine domain of the clock protein or in photoperiodic response within or between latitudes despite the fact that male and female g. aculeatus are photoperiodic at both latitudes. hence, caution is urged when interpreting variation in the polyglutamine repeat ( ... | 2013 | 23464546 |