scholarly journals Phenological and phenotypic changes in Atlantic salmon populations in response to a changing climate

2012 ◽  
Vol 69 (9) ◽  
pp. 1686-1698 ◽  
Author(s):  
Christopher D. Todd ◽  
Kevin D. Friedland ◽  
Julian C. MacLean ◽  
Bryce D. Whyte ◽  
Ian C. Russell ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
Age Structure ◽  
Condition Factor ◽  
Temporal Trends ◽  
Maternal Influence ◽  
Phenotypic Changes ◽  
Changing Climate ◽  
The North ◽  
Age Related ◽  
Run Timing

Abstract Todd, C. D., Friedland, K. D., MacLean, J. C., Whyte, B. D., Russell, I. C., Lonergan, M. E., and Morrissey, M. B. 2012. Phenological and phenotypic changes in Atlantic salmon populations in response to a changing climate. – ICES Journal of Marine Science, 69: 1686–1698. Atlantic salmon (Salmo salar) of southern European origin migrating to the Norwegian Sea currently encounter anomalously high sea-surface temperatures, and returning adults are of low mean condition factor. For the River North Esk (Scotland), time-series changes in river age-structure of emigrant smolts and returning one- and two-sea-winter (1SW and 2SW) adults are assessed. A comparison of the river age-structure of returning adults (1977–1999) with that of their respective annual emigrant smolt cohorts shows no evidence of river age-related bias in survivorship at sea. Evidence is presented of a possible transgenerational, or maternal, influence (poor somatic condition of spawners) driving reduced quality of emigrant S2 smolts in the North Esk. This effect is concurrent with an influence of freshwater climate as indicated by the North Atlantic Oscillation Index (NAOI). The maternal influence and NAOI variation in the winter immediately prior to smolt migration jointly explain approximately 29 (S2) and 17% (S3), respectively, of the variation in the mean size of smolts over the period 1975–2010. Run-timing of 1SW adult cohorts returning to Scotland shows recent delays. Variation in river flow did influence mean return date for the River Tweed, but adult condition factor, which itself shows temporal trends likely to be associated with ocean climate change, was the primary significant explanatory variable for run-timing in the rivers North Esk and Tweed. Overall, in years of poorer adult condition, 1SW salmon stay at sea longer.

Climate-driven biophysical changes in feeding and breeding environments explain the decline of southernmost European Atlantic salmon populations

2019 ◽  
Vol 76 (9) ◽  
pp. 1581-1595 ◽  
Author(s):  
Ana Almodóvar ◽  
Daniel Ayllón ◽  
Graciela G. Nicola ◽  
Bror Jonsson ◽  
Benigno Elvira
Keyword(s):  
Atlantic Salmon ◽  
Regime Shift ◽  
Temporal Trends ◽  
Atlantic Multidecadal Oscillation ◽  
Warming Trend ◽  
Trophic Conditions ◽  
Proximate Cause ◽  
The North ◽  
Spanish Atlantic ◽  
Biophysical Changes

The consistency of the global declining trend of Atlantic salmon (Salmo salar) populations suggests that climate-driven reduced survival and growth at sea are the main driving factors. The southernmost populations have experienced the greatest declines, consistent with harsher conditions in natal fresh waters. We analyzed temporal trends in Spanish Atlantic salmon, important food organisms at sea, and climatic variables in the breeding (fresh water) and feeding (marine) salmon areas from 1950 onwards to elucidate drivers of declining patterns. Salmon abundance dropped abruptly in 1970–1971, plausibly linked to widespread overfishing coincident with incipient changes in the marine food webs and freshwater hydrology. A major regime shift in biophysical conditions throughout the North Atlantic salmon feeding grounds occurred in 1986–1987, driven by the concurrence of an abrupt acceleration in the anthropogenic warming trend and the warm phase of the Atlantic Multidecadal Oscillation. This regime shift may be the proximate cause of the collapse of Spanish salmon observed in 1988–1989, which kept declining in parallel to trends of ever-increasing ocean and freshwater temperatures, decreasing river flows, and poorer marine trophic conditions.

scholarly journals Feeding of Atlantic salmon (Salmo salar L.) post-smolts in the Northeast Atlantic

2006 ◽  
Vol 63 (8) ◽  
pp. 1488-1500 ◽  
Author(s):  
Monika Haugland ◽  
Jens Christian Holst ◽  
Marianne Holm ◽  
Lars Petter Hansen
Keyword(s):  
Atlantic Salmon ◽  
Condition Factor ◽  
Pelagic Fish ◽  
Norwegian Sea ◽  
Northeast Atlantic ◽  
The North ◽  
Important Prey ◽  
The United Kingdom ◽  
Spawning Areas ◽  
High Condition

Abstract Stomach samples from 1384 Atlantic salmon, collected from 1991 to 2003 in the Northeast Atlantic, were analysed to fill the gap between studies on post-smolt diet in fjords and coastal areas of the Northeast Atlantic and studies on the diet of pre-adults and adults in the Norwegian Sea. The post-smolts fed largely on 0-group fish. Blue whiting was an important prey only in the slope current transporting the larvae from the spawning areas west of the United Kingdom into the North and Norwegian Seas. Sandeel and herring were important or present in the stomachs throughout most of the area studied. Unusually large quantities of 0-group herring in the Norwegian Sea in summer 2002 coincided with a high condition factor of post-smolts that year. The forage ratio of the post-smolts was positively related to the proportion of herring in the stomachs and the abundance of herring recruits. Despite these findings, the most productive period for Atlantic salmon on record, the 1970s, coincided with the collapse of the Norwegian spring-spawning herring, which raises the question as to whether herring is more important as a competitor than as a food source. Hyperiid amphipods were more important prey than krill, in contrast to the situation for other pelagic fish species.

Present Status of the Salmonids Atlantic Salmon and Sea-Trout in the Dutch Part of the River Rhine

1994 ◽  
Vol 29 (3) ◽  
pp. 37-41 ◽  
Author(s):  
W. G. Cazemier
Keyword(s):  
Atlantic Salmon ◽  
Salmo Trutta ◽  
Natural Populations ◽  
River Rhine ◽  
Sea Trout ◽  
The Past ◽  
The North ◽  
Trout Population ◽  
The North Sea ◽  
Heavy Pollution

In the past, the anadromous salmonids, Atlantic salmon (Salmo salar) and sea-trout (Salmo trutta), have formed natural populations in the river Rhine. From the beginning of the nineteenth century onwards, the greater part of the drainage area of the river has been gradually altered from a more or less rural and agricultural area, into a highly industrialised one with subsequent industrialisation, river-engineering and heavy pollution. These developments are considered to be the major cause for the disappearance of the populations of anadromous salmonid fish in the 1950s. The water quality has recovered significantly during the past 25 years. From about 1975 onwards, this process gave rise to a recovery of the anadromous trout population. Results of recent studies of the sea-trout migration pattern are presented. They reveal that nowadays these salmonids can complete their up- and downstream migrations from the North Sea to places, situated at hundreds of kilometres upward the river and vica versa. The numbers of recorded Atlantic salmon and catch locations in inland waters are presented. They show a significant increase since 1989. These phenomena can be understood as promising signs of the recovery of the Rhine aquatic ecosystem.

scholarly journals Physiological resilience of pink salmon to naturally occurring ocean acidification

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Andrea Y Frommel ◽  
Justin Carless ◽  
Brian P V Hunt ◽  
Colin J Brauner
Keyword(s):  
British Columbia ◽  
Elevated Co2 ◽  
Condition Factor ◽  
Pacific Salmon ◽  
Pink Salmon ◽  
Hypoxia Tolerance ◽  
High Co2 ◽  
The North ◽  
Naturally Occurring ◽  
Co2 Levels

Abstract Pacific salmon stocks are in decline with climate change named as a contributing factor. The North Pacific coast of British Columbia is characterized by strong temporal and spatial heterogeneity in ocean conditions with upwelling events elevating CO2 levels up to 10-fold those of pre-industrial global averages. Early life stages of pink salmon have been shown to be affected by these CO2 levels, and juveniles naturally migrate through regions of high CO2 during the energetically costly phase of smoltification. To investigate the physiological response of out-migrating wild juvenile pink salmon to these naturally occurring elevated CO2 levels, we captured fish in Georgia Strait, British Columbia and transported them to a marine lab (Hakai Institute, Quadra Island) where fish were exposed to one of three CO2 levels (850, 1500 and 2000 μatm CO2) for 2 weeks. At ½, 1 and 2 weeks of exposure, we measured their weight and length to calculate condition factor (Fulton’s K), as well as haematocrit and plasma [Cl−]. At each of these times, two additional stressors were imposed (hypoxia and temperature) to provide further insight into their physiological condition. Juvenile pink salmon were largely robust to elevated CO2 concentrations up to 2000 μatm CO2, with no mortality or change in condition factor over the 2-week exposure duration. After 1 week of exposure, temperature and hypoxia tolerance were significantly reduced in high CO2, an effect that did not persist to 2 weeks of exposure. Haematocrit was increased by 20% after 2 weeks in the CO2 treatments relative to the initial measurements, while plasma [Cl−] was not significantly different. Taken together, these data indicate that juvenile pink salmon are quite resilient to naturally occurring high CO2 levels during their ocean outmigration.

scholarly journals The early marine distribution of Atlantic salmon in the North‐east Atlantic: A genetically informed stock‐specific synthesis

2021 ◽  
Author(s):  
John Gilbey ◽  
Kjell Rong Utne ◽  
Vidar Wennevik ◽  
Alexander Christian Beck ◽  
Kyrre Kausrud ◽  
...  
Keyword(s):  
Atlantic Salmon ◽  
East Atlantic ◽  
North East ◽  
The North ◽  
Specific Synthesis

AGE-RELATED FEATURES OF THE DYNAMICS OF MORBIDITY AND MORTALITY, LOCALIZATION AND HISTOLOGICAL STRUCTURES OF RECTAL CANCER (POPULATION STUDY)

2021 ◽  
pp. 900-907
Author(s):  
В. М. Мерабишвили ◽  
Д. М. Дубовиченко ◽  
М. Ю. Вальков ◽  
А. М. Щербаков ◽  
Э. Н. Мерабишвили
Keyword(s):  
Rectal Cancer ◽  
Malignant Tumors ◽  
Federal District ◽  
Distal Colon ◽  
Morbidity And Mortality ◽  
The North ◽  
Leading Role ◽  
Age Related ◽  
Icd 10 ◽  
North Western

Рак прямой кишки (РПК) - это злокачественная опухоль дистального отдела толстой кишки эпителиального происхождения. Ежегодно в России регистрируется более 30 тыс. (30 969 в 2018 г.) новых случаев РПК и 16 тыс. (16 151) случаев смерти. Индекс достоверности учета (отношение числа умерших к заболевшим) составляет 0,52 %. РПК относится к локализациям со средним уровнем летальности. В Северо-Западном Федеральном округе зарегистрировано более 3 тыс. первичных случаев РПК (3 285 в 2018 г.). Государственная статистика РПК представляет данные о заболеваемости и смертности населения по трем рубрикам МКБ-10 вместе (С19-21). Детальная разработка данных не только отдельно по каждой рубрике МКБ-10, но и по четвертому знаку возможна только по материалам баз данных раковых регистров. Созданный нами Популяционный раковый регистр Северо-Западного Федерального округа насчитывал на 01.01.2019 г. более 1 млн (1 067 661) случаев злокачественных новообразований (ЗНО), в том числе РПК - 50 745 случаев, или 4,8 %. Удельный вес РПК близок к среднероссийскому - 4,9 %. В работе представлена детальная структура онкологической патологии по РПК. Ведущая роль из трех указанных рубрик принадлежит ЗНО прямой кишки (С20) - 75,4 %; 19,8 % приходится на ЗНО ректосигмоидного отдела (С19) и только 4,7 % на С21 - ЗНО ануса и анального канала. По всем этим рубрикам представлена динамика структуры, которая оказалась достаточно устойчивой. Rectal cancer is a malignant tumor of the distal colon of epithelial origin. Every year, more than 30,000 (30 969 - 2018) new cases of Rectal cancer and 16,000 deaths (16 151) are registered in Russia. The index of reliability of accounting (the ratio of the number of dead to sick) is 0,52 %. Rectal cancer refers to localities with an average mortality rate. In the North-Western Federal district, more than 3 thousand primary cases of Rectal cancer were registered (3285 - 2018). The state statistics of the Rectal cancer provides data on morbidity and mortality in three categories of ICD-10 together (C19-21). Detailed development of data not only separately for each category of ICD-10, but also for the fourth sign is possible only from the data bases of cancer registers. As of 01.01.2019, the Population cancer register of the North-Western Federal district created by us totaled more than 1 million cases of malignant tumors (1 067 661), including Rectal cancer - 50 745 cases, or 4,8 %. The share of the Rectal cancer is close to the national average - 4,9 %. The article presents a detailed structure of cancer pathology in Rectal cancer. The leading role of the 3 specified categories belongs to the rectal malignant tumors (C20) - 75,4 %, 19,8 % falls on the malignant tumors of the rectosigmoid department (C19) and only 4,7 % on the C21 - malignant tumors of the anus and anal canal. For all these categories, the dynamics of the structure is presented, which proved to be quite stable.

Age-related blood biochemical changes (lipid metabolism) in healthy young and mature men living under the North conditions

2021 ◽  
Vol 66 (12) ◽  
pp. 728-732
Author(s):  
Inessa Vladislavovna Averyanova
Keyword(s):  
Lipid Metabolism ◽  
Cardiovascular Diseases ◽  
Lipid Profile ◽  
Metabolic Disorders ◽  
Age Groups ◽  
Photometric Method ◽  
The North ◽  
Blood Biochemical ◽  
Age Related ◽  
Younger Men

Metabolic disorders (dyslipidemias) are currently crucial since they develop cardiovascular diseases. The work was aimed at studying age dynamics and its correlation with severity of dyslipidemia in basic lipid metabolism variables (in different age groups). Materials and methods: Examinees were Caucasians born and permanently residing in Magadan region: 55 mature men and 147 young men (mean ages were 36.8±0.8 and 18.7±0.8 yr, respectively). Blood serum lipid metabolism was examined by colorimetric and photometric method using AU 680 (Beckman Coulter, USA). Results: The data of obtained lipidogram showed dependence of rise in all indicators on subjective older age with higher percentage of dyslipidemia and increase in calculated indices reflecting degree of the lipid profile atherogenicity. Conclusion: Overall, the North study revealed a safer lipid profile in group of younger men, while biochemical picture of older residents demonstrated increased values. Lipid atherogenicity is a very alarming factor in developing cardiovascular diseases, and a predictor of risks for metabolic syndrome.

Reproductive senescence in free-ranging North American elk Cervus elaphus Cervidae

Mammalia ◽  
2019 ◽  
Vol 83 (6) ◽  
pp. 593-600 ◽  
Author(s):  
Louis C. Bender ◽  
Jessica R. Piasecke
Keyword(s):  
Age Structure ◽  
Cervus Elaphus ◽  
North American ◽  
Reproductive Senescence ◽  
Female Age ◽  
North American Elk ◽  
Age Related ◽  
Consistent Manner ◽  
Multiple Species ◽  
Free Ranging

Abstract Successful production of calves is necessary for growth of North American elk (Cervus elaphus Linnaeus 1758) populations, but few studies have evaluated age-related effects on both the conception and survival of a calf to weaning in multiple free-ranging populations. Conception and survival of calves to weaning were both affected by maternal age, with old (age 9 and older) females showing reproductive senescence as compared to prime-aged (ages 2–8) females despite achieving similar or greater size and condition. Reproductive senescence in our free-ranging populations ultimately resulted in old females weaning fewer calves (0.42 calves/female) than did prime-aged females (0.64 calves/female). Other factors, especially maternal size, also influenced conception and survival to weaning, and these interacted with age in a consistent manner, i.e. larger females or females in better condition were more likely to conceive and successfully wean calves within each age class. Female age structure receives less consideration in ungulate management than does male age structure, despite demonstrated impacts on population productivity of multiple species because of reproductive senescence. Because of the large proportion of individuals in senesced age classes in elk populations, low productivity in populations may simply reflect female age structure, rather than other frequently hypothesized factors.

scholarly journals Spatial and spatiotemporal dynamics of visceral leishmaniasis in an endemic North-eastern region of Brazil

2021 ◽  
Vol 15 (2) ◽  
Author(s):  
Ândria Silveira Almeida ◽  
Caíque Jordan Nunes Ribeiro ◽  
Camila Caroline Carlini ◽  
Rogério Silva Santos ◽  
Allan Dantas Dos Santos ◽  
...  
Keyword(s):  
Visceral Leishmaniasis ◽  
Temporal Trends ◽  
Spatiotemporal Dynamics ◽  
Eastern Region ◽  
Endemic Region ◽  
Health Care Networks ◽  
The North ◽  
North Eastern ◽  
Local Moran ◽  
New Research

Visceral Leishmaniasis (VL) is a neglected disease with increasing incidence in Brazil, particularly in the North-eastern. The aim of this study was to analyze the spatial and spatiotemporal dynamics of VL in an endemic region of North-eastern Brazil, between 2009 and 2017. Using spatial analysis techniques, an ecological and time series study was made regarding VL cases in Sergipe filed as notifiable disease events. With data from the Brazilian Institute of Geography and Statistics (Instituto Brasileiro de Geografia e Estatística, IBGE), a digital population and cartographic baseline was established. Segmented linear regression was used to examine the temporal trends. The statistical analysis methods of Global and Local Moran’ I, local Bayesian empirical methodology and spatial-temporal scanning were used to produce thematic maps. High instances were found among adults, males, urban residents, non-Whites and persons with low levels of education. A decrease in the recovery rate and an increase in the proportion of urban cases and lethality was found. A heterogeneous VL distribution with spatiotemporal agglomeration on the seaside of the state was seen in Sergipe. To better manage the disease, new research is encouraged together with development of public health strategies. Further, improving health care networks, especially primary care, is suggested as this approach has a key role in health promotion, prevention and monitoring of the most prevalent diseases.

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