ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    facet.materialart.
    Unknown
    A novel clade of protistan parasites near the animal-fungal divergence. (1996)
    National Academy of Sciences
    Details
    Publication Date: 1996-10-15
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 2
    facet.materialart.
    Unknown
    Habitat modelling of key copepod species in the Northwest Atlantic Ocean based on the Atlantic Zone Monitoring Program (2016)
    Oxford University Press
    Details
    Publication Date: 2016-06-04
    Description: Fourteen years of data collected by the Atlantic Zone Monitoring Program served to model the habitat of four dominant copepod species ( Calanus glacialis , Calanus hyperboreus , Calanus finmarchicus , Paracalanus sp.) on the continental shelf and slope waters in the Northwest Atlantic Ocean. Generalized additive mixed models (GAMMs) were applied to abundance and presence–absence data for C. hyperboreus , C. glacialis and Paracalanus sp. and abundance for C. finmarchicus , to describe the optimal environmental productivity envelopes associated with the occurrence and/or the net productivity of these species. The models for Calanus species considered two main phases of their life cycle: (i) an active population growth phase dominated by early stages that occur primarily in surface layers, and (ii) a dormant phase dominated by overwintering stages generally found in deeper layers. GAMMs identified a marked contrast in environmental envelopes occupied by arctic and temperate species. Our analyses underline the importance of using data representative of all the copepodid developmental stages and occupied habitats in order to accurately model the distribution of Calanus species. The value of our models as tools to understand past events in the Northwest Atlantic or to predict future distributions of the species is also discussed.
    Print ISSN: 0142-7873
    Electronic ISSN: 1464-3774
    Topics: Biology
    Published by Oxford University Press
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 3
    facet.materialart.
    Unknown
    Mortality and recruitment in two copepod populations in a subarctic oligotrophic reservoir and the influence of environmental forcing (2016)
    Oxford University Press
    Details
    Publication Date: 2016-08-20
    Description: We describe the stage-specific mortality, survival and recruitment patterns for a cyclopoid and a calanoid copepod through the use of vertical life table analysis. Over a 2-year period in Lake Saint-Jean, Québec, Canada, we show that during the growing season, Diacyclops bicuspidatus thomasi  (May–June) had its highest daily mortality rate during metamorphosis (N6–C1), while Leptodiaptomus ashlandi (June–August) had its highest daily mortality rates during the naupliar stages. Patterns in daily recruitment rates differed between the species with the early stages of L. ashlandi experiencing a greater population loss during the growing season. Recruitment of D. bicuspidatus thomasi was controlled by reproduction, while recruitment of L. ashlandi was governed by reproduction and mortality/survival although also influenced by seasonal patterns of phytoplankton biomass. A multiple regression model suggested that cannibalism influenced the mortality of the early stages of D. bicuspidatus thomasi during their growing season. Temperature, competition and cannibalism influenced the mortality of the early stages of L. ashlandi . However, there are interannual differences likely due to interannual difference in seasonal patterns of phytoplankton biomass. Our study emphasizes the importance of interactions between bottom-up and top-down controls governing copepod population dynamics.
    Print ISSN: 0142-7873
    Electronic ISSN: 1464-3774
    Topics: Biology
    Published by Oxford University Press
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 4
    facet.materialart.
    Unknown
    Assessing stable isotope dynamics of diapausing Calanus finmarchicus and C. hyperboreus during the overwintering period: a laboratory experiment (2012)
    Oxford University Press
    Details
    Publication Date: 2012-06-26
    Description: This study aimed at describing changes in the stable isotopic composition of late copepodite stage V (CV) subarctic marine copepods ( Calanus finmarchicus and C. hyperboreus ) during overwintering non-feeding periods. Diapausing stage CVs sampled in deep waters of the Lower St. Lawrence Estuary (Québec, Canada) in late-September 2009 were monitored for 4 months under controlled laboratory conditions. CVs and newly moulted adults were analyzed for 13 C and 15 N signatures as well as lipid, carbon and nitrogen content. Lipids were extracted in half of the samples to compare 13 C of individuals with and without lipids and to evaluate the accuracy of mass balance correction models for 13 C under lipid influence. Lipid content generally decreased with time for both species, which was reflected in an increase of 13 C values of CVs but a constant 13 C in newly moulted adults. Accordingly, lipid extraction resulted in an increase of 13 C in CVs and adults. The mean 13 C signature of lipid-extracted individuals remained constant through the time for CVs of both species and for C. finmarchicus adults. 15 N signatures of individuals increased after lipid extraction, but this did not result in a constant value over time, suggesting that several endogenous metabolic processes affected nitrogen isotopic content. The accuracy of the mass balance model differed between species and stages, suggesting that lipid extraction should always be performed prior to applying mathematical corrections.
    Print ISSN: 0142-7873
    Electronic ISSN: 1464-3774
    Topics: Biology
    Published by Oxford University Press
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 5
    facet.materialart.
    Unknown
    Overlapping size ranges of Calanus spp. off the Canadian Arctic and Atlantic Coasts: impact on species' abundances (2011)
    Oxford University Press
    Details
    Publication Date: 2011-11-24
    Description: In the North Atlantic, Calanus finmarchicus , C. glacialis and C. hyperboreus are identified based on subtle morphological traits, which is fastidious, or based on their allegedly non-overlapping prosome length ranges. We reappraised the prosome length-based diagnosis for the copepodite stage V stage by coupling prosome length and molecular identifications (mtDNA, 16S gene) for 1159 individuals collected over 2 years from 15 stations off the Canadian coast from the Arctic to the Atlantic. We observed spatial but no intra-annual variation in species' average prosome length. At sympatric coastal sites, prosome length overlap was frequent between C. finmarchicus and C. glacialis and restricted to the Estuary/Gulf of St. Lawrence between C. glacialis and C. hyperboreus . We used discriminant analyses to redefine prosome length criteria to minimize errors in species identification. Species abundances were corrected and this affected mostly C. glacialis . In the St. Lawrence Estuary and on the Labrador shelf, abundance of C. glacialis was underestimated by 19 and 35%, respectively, with important interannual variations since 2000. This increase in abundance could enhance estimation of the role of C. glacialis in the food web and potentially alter our view of the long-term changes along the eastern Canadian coast.
    Print ISSN: 0142-7873
    Electronic ISSN: 1464-3774
    Topics: Biology
    Published by Oxford University Press
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 6
    facet.materialart.
    Unknown
    Daytime depth and thermal habitat of two sympatric krill species in response to surface salinity variability in the Gulf of St Lawrence, eastern Canada (2014)
    Oxford University Press
    Details
    Publication Date: 2014-01-22
    Description: Plourde, S., McQuinn, I. H., Maps, F., St-Pierre, J-F., Lavoie, D., and Joly, P. 2014. Daytime depth and thermal habitat of two sympatric krill species in response to surface salinity variability in the Gulf of St Lawrence, eastern Canada. – ICES Journal of Marine Science, 71: 272–281. We describe the response of acoustically determined weighted mean depth (WMD) of two sympatric species of krill, Thysanoessa raschii and Meganyctiphanes norvegica , to variations in surface salinity during summer in the Gulf of St Lawrence. In this coastal system, non-living particulates and CDOM carried by the freshwater run-off of the St Lawrence River and several large rivers have a strong impact on turbidity and light attenuance in the surface layer. The WMD of T. raschii and M. norvegica were significantly and positively related to surface salinity. However, M. norvegica was found deeper and in warmer water than T. raschii , and the latter had a steeper response to surface salinity. The species-specific relationships between daytime WMD and surface salinity enabled us to estimate both species regional and interannual variations in summertime temperature habitat during a 21-year period (1991–2011). The variability in daytime WMD resulted in significant inter- and intraspecific differences in the temperature experienced by adult krill that may impact development, growth, and reproduction. Our study illustrated the importance of considering species-specific responses to environmental forcing in coupled biophysical models that aim to explore the impacts of environmental variations on krill dynamics.
    Print ISSN: 1054-3139
    Electronic ISSN: 1095-9289
    Topics: Biology , Geosciences , Physics
    Published by Oxford University Press
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 7
    facet.materialart.
    Unknown
    Parameterizing and operationalizing zooplankton population dynamic and trophic interaction models: Introduction (2014)
    Oxford University Press
    Details
    Publication Date: 2014-01-22
    Description: Plourde, S., and Browman, H. I. 2014. Parameterizing and operationalizing zooplankton population dynamic and trophic interaction models. – ICES Journal of Marine Science, 71: 234–235. This themed set (TS) of articles was motivated by the need for modellers and biologists–ecologists to work more closely together to produce more realistic simulation models of zooplankton population dynamics and trophic interactions. The TS was intended to cover a broad range of subjects and potential approaches, including identifying crucial gaps in our knowledge and parameterization of biological/physiological processes, experimental/fieldwork aimed at quantifying the response of key physiological and behavioural processes to variations in the environment, identifying novel modelling approaches that would enable the development of simulation models that would minimize the need for species-specific (and stage-specific) model parameterization, etc. Five articles were accepted for inclusion in the TS. They cover the majority of these themes. TSs are intended to be instrumental in focusing attention, triggering opinions, and stimulating ideas, discussion and activity in specific research fields. We hope that this TS has achieved that.
    Print ISSN: 1054-3139
    Electronic ISSN: 1095-9289
    Topics: Biology , Geosciences , Physics
    Published by Oxford University Press
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 8
    facet.materialart.
    Unknown
    Modelling the influence of daytime distribution on the transport of two sympatric krill species (Thysanoessa raschii and Meganyctiphanes norvegica) in the Gulf of St Lawrence, eastern Canada (2014)
    Oxford University Press
    Details
    Publication Date: 2014-01-22
    Description: Maps, F., Plourde, S., Lavoie, D., McQuinn, I., and Chassé, J. 2014. Modelling the influence of daytime distribution on the transport of two sympatric krill species ( Thysanoessa raschii and Meganyctiphanes norvegica ) in the Gulf of St Lawrence, eastern Canada. – ICES Journal of Marine Science, 71: 282–292. The Gulf of St Lawrence (GSL) provides several species of North Atlantic baleen whale with an abundant supply of krill, dominated by Thysanoessa raschii and Meganyctiphanes norvegica . We aimed to quantify the differences in upstream advection resulting from the interaction between the circulation and the specific diel vertical migration of T. raschii and M. norvegica at the scale of the northwest GSL. We coupled a regional circulation model with Lagrangian models where the daytime depth followed specific functions of surface salinity. Our results help to explain the spatio-temporal variability in both T. raschii and M. norvegica distributions. We identified in particular spatio-temporal patterns in krill upstream transport. During summer and autumn, the upstream transport of krill is steady across Jacques Cartier Strait, limited across Honguedo Strait, and more sporadic across the Estuary mouth. We estimated that the upstream advection of krill particles across the Estuary mouth would be higher by 16–17% for the T. raschii than for the M. norvegica daytime behaviour. Our results also suggest that the advective processes operating on the adults during the productive season are not the only cause for the observed magnitude of the interannual and interspecific variability in krill abundance.
    Print ISSN: 1054-3139
    Electronic ISSN: 1095-9289
    Topics: Biology , Geosciences , Physics
    Published by Oxford University Press
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 9
    facet.materialart.
    Unknown
    Modelling the timing and duration of dormancy in populations of Calanus finmarchicus from the Northwest Atlantic shelf (2011)
    Oxford University Press
    Details
    Publication Date: 2011-12-13
    Description: Calanus finmarchicus relies on dormancy to thrive in the seasonal environment of the boreal Atlantic. The lipid accumulation window (LAW) hypothesis proposes that a seasonal window of environmental conditions allows developing individuals to store enough lipids for dormancy to be safely initiated. Successful dormancy requires a sufficient amount of lipids to fulfil the reduced metabolic demand of the dormant individual and to sustain the final maturation process. We used a pattern-oriented modelling approach that implements the LAW hypothesis and employs a genetic algorithm for parameter estimation, in order to reproduce the observed phenology and demography of C. finmarchicus populations from the two contrasting regions, the Gulf of St. Lawrence (GSL) and the Gulf of Maine (GoM) in the northwest Atlantic shelf. In the GSL, the model reproduced the timing of dormancy, the abundance and individual condition of late copepodid stages. In the GoM, the model produced a semi-annual dormancy pattern, as no locally produced individual could last the 6–8 months of dormancy inferred from the available observations. Further testing requires extending demographic time series, including lipid condition of late copepodid stages in the GoM, and the implementation of a 3-D modelling framework that would explicitly address the complex interactions between circulation and population dynamics of C. finmarchicus over the entire northwest Atlantic shelf.
    Print ISSN: 0142-7873
    Electronic ISSN: 1464-3774
    Topics: Biology
    Published by Oxford University Press
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
  • 10
    facet.materialart.
    Unknown
    Zooplankton prey selection among three dominant ichthyoplankton species in the northwest Gulf of St Lawrence (2012)
    Oxford University Press
    Details
    Publication Date: 2012-02-07
    Description: The diets and feeding niches of early-stage larval sandlance ( Ammodytes spp.), arctic shanny ( Stichaeus punctatus ), and snakeblenny ( Lumpenus lampreytaeformis ) were examined to study interactions among these dominant fish species and to better understand the ecological processes involved in structuring the ichthyoplankton community in the northwest Gulf of St Lawrence (GSL). Results indicate that sandlance and arctic shanny larvae have similar feeding niches but also that arctic shanny is more of a generalist and could be better adapted to cope with changes in the zooplankton community. The feeding incidence of sandlance larvae was lower than expected when compared with other similar studies. Snakeblenny larvae were larger and more developed at sampling time; they occupied a different feeding niche with larger prey species compared with sandlance and arctic shanny larvae. In the northwest GSL, the presence of Calanus glacialis and Calanus hyperboreus may be favourable for arctic shanny and snakeblenny since these copepod species are less exploited by sandlance larvae. This study is the first to describe diet selectivity and feeding niches of early-stage larval snakeblenny and arctic shanny in the natural environment. Our results demonstrate that detailed diet descriptions based on prey species and developmental stage identification should be used for a better interpretation of interactions within ichthyoplankton communities.
    Print ISSN: 0142-7873
    Electronic ISSN: 1464-3774
    Topics: Biology
    Published by Oxford University Press
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER CURRENT
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...