scholarly journals Ecological and environmental drivers of blue crab population dynamics across scales

2018 ◽  
Author(s):  
Rogers
Keyword(s):  
Population Dynamics ◽  
Blue Crab ◽  
Environmental Drivers ◽  
Crab Population

scholarly journals POPULATION TREND OF THE INVASIVE BLUE CRAB CALLINECTES SAPIDUS RATHBUN,1896 IN PATOKU LAGOON.

2021 ◽  
pp. 135-140
Author(s):  
Ermira Milori ◽  
Stela Ruci ◽  
Sajmir Beqiraj
Keyword(s):  
Alien Species ◽  
Blue Crab ◽  
Callinectes Sapidus ◽  
Population Trend ◽  
Crab Population ◽  
Scientific Report ◽  
Marine Alien Species

The blue crab Callinectes sapidus is one of the 23 marine alien species reported for the Albanian coast so far (Beqiraj et al., 2012; Katsanevakis et al., 2011). The first scientific report on the presence of this species in the Albanian coast is in 2009, in Patoku Lagoon. The blue crab population in Patoku Lagoon had grown significantly by 2009 and the blue crab had started to be traded. The data collected in that year showed that this species is assessed to be established in the Patoku Lagoon (Beqiraj & Kashta, 2010). Special attention has been paid to the study of blue crab population in the following years during 2010 - 2015. The aim of this study is to evaluate the development and population trend of blue crab in the Patoku Lagoon referring to the data collected throughout years of study.

scholarly journals Contrasting effects of climate change on seasonal survival of a hibernating mammal

2020 ◽  
Vol 117 (30) ◽  
pp. 18119-18126 ◽  
Author(s):  
Line S. Cordes ◽  
Daniel T. Blumstein ◽  
Kenneth B. Armitage ◽  
Paul J. CaraDonna ◽  
Dylan Z. Childs ◽  
...  
Keyword(s):  
Climate Change ◽  
Population Dynamics ◽  
Life History ◽  
Environmental Conditions ◽  
Temporal Trends ◽  
Life History Strategies ◽  
Environmental Drivers ◽  
Age Classes ◽  
History Of ◽  
Colorado Rocky Mountains

Seasonal environmental conditions shape the behavior and life history of virtually all organisms. Climate change is modifying these seasonal environmental conditions, which threatens to disrupt population dynamics. It is conceivable that climatic changes may be beneficial in one season but result in detrimental conditions in another because life-history strategies vary between these time periods. We analyzed the temporal trends in seasonal survival of yellow-bellied marmots (Marmota flaviventer) and explored the environmental drivers using a 40-y dataset from the Colorado Rocky Mountains (USA). Trends in survival revealed divergent seasonal patterns, which were similar across age-classes. Marmot survival declined during winter but generally increased during summer. Interestingly, different environmental factors appeared to drive survival trends across age-classes. Winter survival was largely driven by conditions during the preceding summer and the effect of continued climate change was likely to be mainly negative, whereas the likely outcome of continued climate change on summer survival was generally positive. This study illustrates that seasonal demographic responses need disentangling to accurately forecast the impacts of climate change on animal population dynamics.

scholarly journals Climatic changes cause synchronous population dynamics and adaptive strategies among coastal hunter-gatherers in Holocene northern Europe

2020 ◽  
pp. 1-16 ◽  
Author(s):  
Erlend Kirkeng Jørgensen ◽  
Petro Pesonen ◽  
Miikka Tallavaara
Keyword(s):  
Population Dynamics ◽  
Environmental Changes ◽  
Environmental Variability ◽  
Temporal Frequency ◽  
Environmental Drivers ◽  
Natural Phenomenon ◽  
Northern Europe ◽  
Human Populations ◽  
Hunter Gatherers ◽  
Human Ecodynamics

Abstract Synchronized demographic and behavioral patterns among distinct populations is a well-known, natural phenomenon. Intriguingly, similar patterns of synchrony occur among prehistoric human populations. However, the drivers of synchronous human ecodynamics are not well understood. Addressing this issue, we review the role of environmental variability in causing human demographic and adaptive responses. As a case study, we explore human ecodynamics of coastal hunter-gatherers in Holocene northern Europe, comparing population, economic, and environmental dynamics in two separate areas (northern Norway and western Finland). Population trends are reconstructed using temporal frequency distributions of radiocarbon-dated and shoreline-dated archaeological sites. These are correlated to regional environmental proxies and proxies for maritime resource use. The results demonstrate remarkably synchronous patterns across population trajectories, marine resource exploitation, settlement pattern, and technological responses. Crucially, the population dynamics strongly correspond to significant environmental changes. We evaluate competing hypotheses and suggest that the synchrony stems from similar responses to shared environmental variability. We take this to be a prehistoric human example of the “Moran effect,” positing similar responses of geographically distinct populations to shared environmental drivers. The results imply that intensified economies and social interaction networks have limited impact on long-term hunter-gatherer population trajectories beyond what is already proscribed by environmental drivers.

Periodicities in blue crab population of Chesapeake Bay

1979 ◽  
Vol 2 (1) ◽  
pp. 75-78 ◽  
Author(s):  
Paul R. Hurt ◽  
Leona Marshall Libby ◽  
Louis J. Pandolfi ◽  
Lawrence H. Levine ◽  
W. A. Van Engel
Keyword(s):  
Chesapeake Bay ◽  
Blue Crab ◽  
Crab Population

scholarly journals Morfologija i ekologija slabo poznatog dinoflagelata Prorocentrum arcuatum (Dinophyceae) iz Medulinskog zaljeva (istočni dio Jadranskog mora)

2017 ◽  
Vol 58 (1) ◽  
pp. 41-52 ◽  
Author(s):  
Sanda Skejić ◽  
Slaven Jozić ◽  
Jacob Larsen ◽  
Olja Vidjak ◽  
Grozdan Kušpilić ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Population Structure ◽  
Environmental Drivers ◽  
Natural Conditions ◽  
Sem Images ◽  
Phytoplankton Population ◽  
Narrow Temperature Range ◽  
Physical Conditions ◽  
Field Samples ◽  
General Similarity

The unusual and prolonged occurrence of rare and poorly known dinoflagellate Prorocentrum arcuatum in the phytoplankton of the shallow aquaculture site in Medulin Bay was recorded from July 2013 to October 2014. This enabled us to investigate changes in abundance and environmental drivers of P. arcuatum population dynamics in natural conditions, and to provide first detailed description of P. arcuatum from field samples based on SEM images. During 15 months of observations we also recorded seasonal variability in P. arcuatum cell size. The optimum physical conditions for P. arcuatum proliferation were reached in autumn 2013, during the narrow temperature range between 19.6 oC – 20.4 oC, and salinity between 36.7 - 37.7. Despite the general similarity in physical conditions in autumn 2014, this increase in the abundance of P. arcuatum was not repeated, which might be connected to higher competition due to observed interannual changes in phytoplankton population structure.

Drivers of demography: past challenges and a promise for a changed future

2021 ◽  
pp. 115-130
Author(s):  
Pedro F. Quintana-Ascencio ◽  
Eric S. Menges ◽  
Geoffrey S. Cook ◽  
Johan Ehrlén ◽  
Michelle E. Afkhami
Keyword(s):  
Population Dynamics ◽  
Environmental Variables ◽  
Environmental Drivers ◽  
Factors Affecting ◽  
Future Developments ◽  
Projections And Predictions ◽  
Demographic Modelling ◽  
Experimental Approaches ◽  
Closed Systems ◽  
Metapopulation Models

There is an urgent need to understand how populations and metapopulations respond to shifts in the environment to mitigate the consequences of human actions and global change. Identifying environmental variables/factors affecting population dynamics and the nature of their impacts is fundamental to improve projections and predictions. This chapter examines how environmental drivers, both continuous (stress) and episodic (disturbance), are incorporated in demographic modelling across many types of organisms and environments, using both observational and experimental approaches to characterise drivers. It critically summarises examples of the main approaches and identifies major accomplishments, challenges, and limitations. The chapter points to promising approaches and possible future developments. In the initial sections, models in closed systems without migration among populations are considered. The chapter then focuses on metapopulation models, emphasising the importance of understanding drivers affecting migration and differential extinction among populations. Finally, it concludes with a discussion of some important and general problems associated with assessing how population dynamics may be affected by environmental drivers that are dynamic, nonlinear, and with indirect and/or interacting effects with other drivers..

scholarly journals Environmental drivers of salp Thalia democratica population dynamics from in situ observations

2016 ◽  
Vol 561 ◽  
pp. 189-201 ◽  
Author(s):  
M Pascual ◽  
MG Neubert ◽  
JL Acuña ◽  
AR Solow ◽  
C Dominguez-Carrió ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Environmental Drivers ◽  
In Situ Observations
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