Search Results - "Unwin, MJ"

Water quality in New Zealand rivers: current state and trends by Larned, ST, Snelder, T, Unwin, MJ, McBride, GB

“…River water quality, particularly in lowland catchments, is a matter of concern to the New Zealand public. We assessed river water quality and biological state…”
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EVOLUTION OF TEMPORAL ISOLATION IN THE WILD: GENETIC DIVERGENCE IN TIMING OF MIGRATION AND BREEDING BY INTRODUCED CHINOOK SALMON POPULATIONS by Quinn, Thomas P, Unwin, Martin J, Kinnison, Michael T

“…The timing of migration and breeding are key life-history traits; they are not only adaptations of populations to their environments, but can serve to increase…”
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The effects of season, temperature and initial gonad condition on roe enhancement of the sea urchin Evechinus chloroticus by James, Philip J., Heath, Philip, Unwin, Martin J.

“…A series of 10-week experiments were repeated during the austral autumn, winter, spring and summer to investigate the seasonal effects, independent of seasonal…”
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MIGRATORY COSTS AND THE EVOLUTION OF EGG SIZE AND NUMBER IN INTRODUCED AND INDIGENOUS SALMON POPULATIONS by Kinnison, Michael T, Unwin, Martin J, Hendry, Andrew P, Quinn, Thomas P

“…The trade-off between reproductive investment and migration should be an important factor shaping the evolution of life-history traits among populations…”
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Contemporary divergence in migratory timing of naturalized populations of chinook salmon, Oncorhynchus tshawytscha, in New Zealand by Quinn, T P, Unwin, MJ, Kinnison, M T

“…Hypotheses: Recently established populations, sharing common ancestry but facing different reproductive habitat seasonality, will genetically diverge in the…”
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Migratory costs and contemporary evolution of reproductive allocation in male chinook salmon by Kinnison, M. T., Unwin, M. J., Quinn, T. P.

“…Energetically demanding migrations may impact the resources available for reproductive trait development and activity, and hence favour evolution of new…”
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Evolution of chinook salmon (Oncorhynchus tshawytscha) populations in New Zealand: pattern, rate, and process by Quinn, T P, Kinnison, M T, Unwin, M J

“…Chinook salmon, Oncorhynchus tshawytscha, from the Sacramento River, California, USA were introduced to New Zealand between 1901 and 1907, and colonized most…”
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Reconstructing recent divergence: evaluating nonequilibrium population structure in New Zealand chinook salmon by Kinnison, M. T., Bentzen, P., Unwin, M. J., Quinn, T. P.

“…Newly established or perturbed populations are often the focus of conservation concerns but they pose special challenges for population genetics because…”
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Survival of chinook salmon, Oncorhynchus tshawytscha, from a spawning tributary of the Rakaia River, New Zealand, in relation to spring and summer mainstem flows by Unwin, MJ

“…To characterize the impact of spring floods on the survival of juvenile chinook salmon (O. tshawytscha) in the unstable, braided rivers on the east coast of…”
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Suppression of maturation in 2-year-old Chinook salmon ( Oncorhynchus tshawytscha) reared under continuous photoperiod by Unwin, M.J., Rowe, D.K., Poortenaar, C.W., Boustead, N.C.

“…We investigated the effect of 24-h photoperiod (LD24:0) on the incidence of sexual maturation in freshwater-reared, 2-year-old Chinook salmon by supplying…”
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Divergence in juvenile growth and life history in two recently colonized and partially isolated chinook salmon populations by Unwin, MJ, Quinn, T P, Kinnison, M T, Boustead, N C

“…In 47 families of New Zealand chinook salmon, Oncorhynchus tshawytscha derived from two populations, differing in mean spawning date by 11-17 days and in…”
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Free and total cortisol levels in semelparous and iteroparous chinook salmon by Barry, T P, Unwin, MJ, Malison, JA, Quinn, T P

“…Total cortisol, free cortisol and percent free cortisol were all significantly higher in semelparous male chinook salmon Oncorhynchus tshawytscha than in…”
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Quantifying Production of Salmon Fry in an Unscreened Irrigation System: A Case Study on the Rangitata River, New Zealand by Unwin, Martin J., Webb, Mark, Barker, Richard J., Link, William A.

“…Diversion of out‐migrant juvenile salmon into unscreened irrigation and hydroelectric canals is thought to have contributed significantly to declining…”
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GPS/GNSS reflectometry nanosatellite demonstration mission by Unwin, Martin J., Douglas Liddle, J., Jason, Susan J.

“…ESA's Passive Reflectometry and Interferometry System makes use of GPS/GNSS signals from satellites and their reflection off the ocean surface to derive…”
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The effect of restricted springtime feeding on growth and maturation of freshwater-reared Chinook salmon, Oncorhynchus tshawytscha (Walbaum) by Hopkins, C L, Unwin, M J

“…Springtime fasting was used as a means to reduce the incidence of early maturation in freshwater cultured male chinook salmon Oncorhynchus tshawytscha…”
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Macroscopic intersexuality in salmonid fishes by Kinnison, M. T., Unwin, M. J., Jara, F.

“…The occurrence of individual salmonids with macroscopically identifiable, simultaneous male and female gonads is an uncommon reproductive disorder. Individual…”
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Variation in the size of Buller's albatross (Thalassarche bulleri) eggs by Sagar, P. M., Unwin, M. J., Stahl, J. C., Warham, John

“…The effect of minimum maternal experience, individual and year on egg size variation, breeding success and sex of the surviving chick were investigated in…”
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Seasonal profiles in growth, energy reserves, gonad development, and plasma steroids in age 1+ cultured Chinook salmon (Oncorhynchus tshawytscha) females by Unwin, M. J., Poortenaar, C. W., Rowe, D. K., Boustead, N. C., Porter, M. J. R.

“…Sexual maturation in 2-year-old female Chinook salmon (Oncorhynchus tshawytscha) is unknown within their native range, but occurs in up to 20% of farmed stocks…”
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An accurate and efficient method for reading sequentially coded wire tags aided by a PC-based data capture program by Unwin, MJ, Hill, J T, Lucas, D H

“…Sequentially coded wire tags (S-CWTs) provide a viable method for marking individuals and small groups of fish but are more difficult to read accurately than…”
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Origin and genetic structure of chinook salmon, Oncorhynchus tshawytscha, transplanted from California to New Zealand: Allozyme and mtDNA evidence by Quinn, T P, Nielsen, J L, Gan, C, Unwin, MJ, Wilmot, R, Guthrie, C, Utter, F M

“…Chinook salmon, Oncorhynchus tshawytscha, transplanted from the Sacramento River, California, to the Waitaki River catchment of New Zealand at the turn of the…”
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