scholarly journals Influence of body size, metabolic rate and life history stage on the uptake and excretion of the lampricide 3-trifluoromethyl-4-nitrophenol (TFM) by invasive sea lampreys (Petromyzon marinus)

2018 ◽  
Vol 194 ◽  
pp. 27-36 ◽  
Author(s):  
Laura R. Tessier ◽  
Tristan A.F. Long ◽  
Michael P. Wilkie
Keyword(s):  
Life History ◽  
Body Size ◽  
Metabolic Rate ◽  
Petromyzon Marinus ◽  
Life History Stage ◽  
Sea Lampreys

Mortality, movement, and body size: critical scales for Atlantic cod (Gadus morhua) in the Northwest Atlantic

1999 ◽  
Vol 56 (S1) ◽  
pp. 180-187 ◽  
Author(s):  
David C Schneider ◽  
Tammo Bult ◽  
Robert S Gregory ◽  
David A Methven ◽  
Danny W Ings ◽  
...  
Keyword(s):  
Life History ◽  
Body Size ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Critical Time ◽  
Life History Stage ◽  
Critical Space ◽  
Limited Data ◽  
Graphical Technique ◽  
Pelagic Juveniles

The problem of scaling spatially and temporally limited data to larger scale questions can no longer be ignored as evidence accumulates that the importance of any given process, relative to another, depends on spatial and temporal scale. A recently developed graphical technique allows identification of critical space and time scales, which separate scales at which one rate prevails from scales at which another rate prevails. We used data from the literature to test a series of hypotheses concerning change in critical scales with change with life history stage in Atlantic cod (Gadus morhua). The critical scales for mortality relative to kinematics increased slightly for pelagic juveniles relative to drifting eggs, decreased substantially for demersal juveniles relative to pelagic juveniles, increased again in adults, and, contrary to expectation, remained high in large adults ("mother fish"). Critical time and space scales were found to be linked and cannot be taken as constants.

scholarly journals Developmental programming of the adrenocortical stress response by yolk testosterone depends on sex and life history stage

2020 ◽  
Vol 223 (22) ◽  
pp. jeb220152
Author(s):  
Hubert Schwabl ◽  
Jesko Partecke
Keyword(s):  
Life History ◽  
Metabolic Rate ◽  
Passer Domesticus ◽  
Developmental Programming ◽  
Life History Stage ◽  
Dependent Manner ◽  
Multiple Traits ◽  
In Ovo ◽  
Corticosterone Secretion ◽  
Baseline Corticosterone

ABSTRACTDevelopmental exposure of embryos to maternal hormones such as testosterone in the avian egg influences the expression of multiple traits, with certain effects being sex specific and lasting into adulthood. This pleiotropy, sex dependency and persistency may be the consequence of developmental programming of basic systemic processes such as adrenocortical activity or metabolic rate. We investigated whether experimentally increased in ovo exposure to testosterone influenced hypothalamus–pituitary–adrenal function, i.e. baseline and stress-induced corticosterone secretion, and resting metabolic rate (RMR) of adult male and female house sparrows (Passer domesticus). In previous experiments with this passerine bird we demonstrated effects of embryonic testosterone exposure on adult agonistic and sexual behavior and survival. Here we report that baseline corticosterone levels and the stress secretion profile of corticosterone are modified by in ovo testosterone in a sex-specific and life history stage-dependent manner. Compared with controls, males from testosterone-treated eggs had higher baseline corticosterone levels, whereas females from testosterone-treated eggs showed prolonged stress-induced corticosterone secretion during the reproductive but not the non-reproductive phase. Adult RMR was unaffected by in ovo testosterone treatment but correlated with integrated corticosterone stress secretion levels. We conclude that exposure of the embryo to testosterone programs the hypothalamus–pituitary–adrenal axis in a sex-specific manner that in females depends, in expression, on reproductive state. The modified baseline corticosterone levels in males and stress-induced corticosterone levels in females may explain some of the long-lasting effects of maternal testosterone in the egg on behavior and could be linked to previously observed reduced mortality of testosterone-treated females.

Reduced dermal photosensitivity in juvenile sea lampreys (Petromyzon marinus) reflects life-history-dependent changes in habitat and behaviour

2013 ◽  
Vol 91 (9) ◽  
pp. 635-639 ◽  
Author(s):  
T.R. Binder ◽  
D.G. McDonald ◽  
M.P. Wilkie
Keyword(s):  
Life History ◽  
Response Time ◽  
White Light ◽  
Life Style ◽  
Petromyzon Marinus ◽  
Open Water ◽  
Selective Advantage ◽  
Median Latency ◽  
Juvenile Phase ◽  
Sea Lampreys

This study tested the hypothesis that sea lampreys (Petromyzon marinus L., 1758) undergo a reduction in the photosensitivity of photoreceptors in the tail after metamorphosing from burrow-dwelling, filter-feeding larval sea lampreys (ammocoetes) into open-water, parasitic juvenile phase animals that attach themselves to and feed on the blood of marine and freshwater fishes. Using a photo-illumination apparatus, ammocoetes and juvenile sea lampreys were exposed to white light at an intensity of 10 lx and the photokinetic response (time to movement) was measured in individual animals. The median latency of the response of juvenile lampreys was 5.4 times longer (i.e., slower response time) than observed in ammocoetes, and only 61% of the juvenile animals responded to the light compared with 95% of ammocoetes. It is concluded that the greater photosensitivity of tail photoreceptors in ammocoetes helps ensure that the animals are totally concealed from potential predators while burrowing. Decreased photosensitivity following metamorphosis is likely related to the transition to an open water, parasitic life style in which tail photoreception would have little selective advantage.

Use of Calcareous Otic Elements (Statoliths) to Determine Age of Sea Lamprey Ammocoetes (Petromyzon marinus)

1986 ◽  
Vol 43 (3) ◽  
pp. 718-722 ◽  
Author(s):  
Eric C. Volk
Keyword(s):  
Life History ◽  
Frequency Analysis ◽  
Petromyzon Marinus ◽  
Age Determination ◽  
Sea Lamprey ◽  
Length Frequency ◽  
Sea Lampreys ◽  
Band Number ◽  
Age Determinations ◽  
Length Frequency Analysis

I examined the possibility that the number of internal bands in calcareous otic elements (statoliths) of sea lamprey ammocoetes (Petromyzon marinus) could be used to estimate age. The correspondence between statolith band number and known ammocoete age was very close for the first 4 yr but less rigorous for the few 7-yr-old specimens examined. This is the first use of calcareous otic elements to determine age in a nonteleost and represents the only direct age determination technique for lampreys. Compared with length–frequency analysis, this method will provide greater reliability of age determinations, essential for investigations on the life history and ecology of sea lampreys.

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