scholarly journals Physiological mechanisms linking cold acclimation and the poleward distribution limit of a range-extending marine fish

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Barrett W Wolfe ◽  
Quinn P Fitzgibbon ◽  
Jayson M Semmens ◽  
Sean R Tracey ◽  
Gretta T Pecl
Keyword(s):  
Swimming Speed ◽  
Minimum Temperature ◽  
Temperature Acclimation ◽  
Environmental Data ◽  
Range Extension ◽  
Range Limits ◽  
Marine Biodiversity ◽  
Aerobic Scope ◽  
Range Edge ◽  
Temperature Exposure

Abstract Extensions of species’ geographical distributions, or range extensions, are among the primary ecological responses to climate change in the oceans. Considerable variation across the rates at which species’ ranges change with temperature hinders our ability to forecast range extensions based on climate data alone. To better manage the consequences of ongoing and future range extensions for global marine biodiversity, more information is needed on the biological mechanisms that link temperatures to range limits. This is especially important at understudied, low relative temperatures relevant to poleward range extensions, which appear to outpace warm range edge contractions four times over. Here, we capitalized on the ongoing range extension of a teleost predator, the Australasian snapper Chrysophrys auratus, to examine multiple measures of ecologically relevant physiological performance at the population’s poleward range extension front. Swim tunnel respirometry was used to determine how mid-range and poleward range edge winter acclimation temperatures affect metabolic rate, aerobic scope, swimming performance and efficiency and recovery from exercise. Relative to ‘optimal’ mid-range temperature acclimation, subsequent range edge minimum temperature acclimation resulted in absolute aerobic scope decreasing while factorial aerobic scope increased; efficiency of swimming increased while maximum sustainable swimming speed decreased; and recovery from exercise required a longer duration despite lower oxygen payback. Cold-acclimated swimming faster than 0.9 body lengths sec−1 required a greater proportion of aerobic scope despite decreased cost of transport. Reduced aerobic scope did not account for declines in recovery and lower maximum sustainable swimming speed. These results suggest that while performances decline at range edge minimum temperatures, cold-acclimated snapper are optimized for energy savings and range edge limitation may arise from suboptimal temperature exposure throughout the year rather than acute minimum temperature exposure. We propose incorporating performance data with in situ behaviour and environmental data in bioenergetic models to better understand how thermal tolerance determines range limits.

Low prevalence of the parasite Ophryocystis elektroscirrha at the range edge of the eastern North American monarch (Danaus plexippus) butterfly population

2021 ◽  
Author(s):  
Felipe Dargent ◽  
Sydney M Gilmour ◽  
Emma A Brown ◽  
Rees Kassen ◽  
Heather M Kharouba
Keyword(s):  
North American ◽  
Population Distribution ◽  
Danaus Plexippus ◽  
Range Limits ◽  
North American Population ◽  
Ophryocystis Elektroscirrha ◽  
Range Edge ◽  
Relative Contribution ◽  
Northern Edge ◽  
Butterfly Population

Every year monarch butterflies (Danaus plexippus Linnaeus, 1758) from the eastern North American population migrate from Mexico to Southern Canada in the spring. This northward migration has been shown to reduce monarch infection with the host-specific parasite Ophryocystis elektroscirrha (OE) (McLaughlin and Myers, 1970); yet, the prevalence of OE at their range limits, and the mechanism(s) responsible, is unknown. We assessed OE infection levels of monarchs at the northern edge of the eastern population distribution around Ottawa, Canada, and found extremely low levels of infection (~1% with upper confidence intervals close to 3%). Low OE infection levels are likely due to low densities of monarchs in this region and/or migratory escape effects, where migrating individuals leave behind areas with high density of conspecifics and high potential for parasite accumulation and transmission. Future work should aim to disentangle the relative contribution of these two mechanisms for governing the decrease in parasitism at the range limits of migratory populations.

scholarly journals Range extension of the Central American Red Brocket, Mazama temama (Kerr, 1792) (Artiodactyla, Cervidae), in Colombia

Check List ◽  
2021 ◽  
Vol 17 (4) ◽  
pp. 1095-1105
Author(s):  
Héctor E. Ramírez-Chaves ◽  
Paula Andrea Ossa-López ◽  
Luis Lasso-Lasso ◽  
Fredy A. Rivera-Páez ◽  
Néstor Roncancio-Duque ◽  
...  
Keyword(s):  
Gene Sequence ◽  
Complete Information ◽  
Geographic Range ◽  
Central American ◽  
Range Extension ◽  
Range Limits ◽  
Colombian Andes ◽  
Representative Species

Mazama temama (Kerr, 1792) is a representative species of the northern Neotropics, but the geographic range limits for this species remain unclear. We report the southernmost record of M. temama from the southwestern Colombian Andes, increasing the previously known range of this species by more than 300 km. We obtained a cytochrome gene sequence (849 bp) which is 95% identical to samples from Mexico. This record raises the need for extensive sampling to obtain more complete information about the distribution of M. temama in northern Colombia.

scholarly journals Framing Cutting-Edge Integrative Deep-Sea Biodiversity Monitoring via Environmental DNA and Optoacoustic Augmented Infrastructures

2022 ◽  
Vol 8 ◽  
Author(s):  
Sergio Stefanni ◽  
Luca Mirimin ◽  
David Stanković ◽  
Damianos Chatzievangelou ◽  
Lucia Bongiorni ◽  
...  
Keyword(s):  
Deep Sea ◽  
Environmental Dna ◽  
Ecological Monitoring ◽  
Environmental Data ◽  
Marine Biodiversity ◽  
Biodiversity Monitoring ◽  
Imaging Data ◽  
Optoacoustic Imaging ◽  
Future Direction ◽  
Critical Overview

Deep-sea ecosystems are reservoirs of biodiversity that are largely unexplored, but their exploration and biodiscovery are becoming a reality thanks to biotechnological advances (e.g., omics technologies) and their integration in an expanding network of marine infrastructures for the exploration of the seas, such as cabled observatories. While still in its infancy, the application of environmental DNA (eDNA) metabarcoding approaches is revolutionizing marine biodiversity monitoring capability. Indeed, the analysis of eDNA in conjunction with the collection of multidisciplinary optoacoustic and environmental data, can provide a more comprehensive monitoring of deep-sea biodiversity. Here, we describe the potential for acquiring eDNA as a core component for the expanding ecological monitoring capabilities through cabled observatories and their docked Internet Operated Vehicles (IOVs), such as crawlers. Furthermore, we provide a critical overview of four areas of development: (i) Integrating eDNA with optoacoustic imaging; (ii) Development of eDNA repositories and cross-linking with other biodiversity databases; (iii) Artificial Intelligence for eDNA analyses and integration with imaging data; and (iv) Benefits of eDNA augmented observatories for the conservation and sustainable management of deep-sea biodiversity. Finally, we discuss the technical limitations and recommendations for future eDNA monitoring of the deep-sea. It is hoped that this review will frame the future direction of an exciting journey of biodiscovery in remote and yet vulnerable areas of our planet, with the overall aim to understand deep-sea biodiversity and hence manage and protect vital marine resources.

scholarly journals The proteomic response of the reef coral Pocillopora acuta to experimentally elevated temperatures

2017 ◽  
Author(s):  
Anderson B Mayfield ◽  
Yi-Jyun Chen ◽  
Chi-Yu Lu ◽  
Chii-Shiarng Chen
Keyword(s):  
High Temperature ◽  
Elevated Temperatures ◽  
Reef Coral ◽  
Temperature Acclimation ◽  
Differentially Expressed ◽  
Cellular Stress Response ◽  
Coral Host ◽  
Host Coral ◽  
Regulate Protein ◽  
Temperature Exposure

Although most reef-building corals live near the upper threshold of their thermotolerance, some scleractinians are resilient to temperature increases. For instance, Pocillopora acuta specimens from an upwelling habitat in Southern Taiwan survived a 9-month experimental exposure to 30°C, a temperature hypothesized to induce stress. To gain a greater understanding of the molecular pathways underlying such high-temperature acclimation, the protein profiles of experimental controls incubated at 27°C were compared to those of conspecific P. acuta specimens exposed to 30°C for two, four, or eight weeks, and differentially expressed proteins (DEPs) were removed from the protein gels and sequenced with mass spectrometry. Sixty unique DEPs were uncovered across both eukaryotic compartments of the P. acuta-dinoflagellate (genus Symbiodinium) mutualism, and Symbiodinium were more likely to up-regulate protein expression in response to high temperature exposure than the coral hosts in which they resided at the 2-week sampling time. Furthermore, different cellular pathways were affected by elevated temperature exposure in each compartment; Symbiodinium tended to up-regulate the expression of proteins involved in the cellular stress response, whereas the differentially expressed host coral proteome featured numerous proteins involved in cytoskeletal structure, immunity, and metabolism. These proteome-scale data suggest that the coral host and its intracellular dinoflagellates have differing cellular strategies for acclimating to elevated temperatures.

GENERATING BIOLOGICALLY RELEVANT ENVIRONMENTAL DATA FROM REMOTE SENSING IMAGERIES AND OCEANOGRAPHIC MODELS TO SUPPORT SPATIAL PRIORITIZATION OF MARINE BIODIVERSITY CONSERVATION AND MANAGEMENT IN INDONESIA

2019 ◽  
Vol 3 ◽  
pp. 965
Author(s):  
Safran Yusri ◽  
Vincentius P. Siregar ◽  
Suharsono Suharsono
Keyword(s):  
Environmental Variables ◽  
Google Earth ◽  
Earth Observation ◽  
Environmental Data ◽  
Marine Biodiversity ◽  
Observation Data ◽  
Distribution Models ◽  
Surface Salinity ◽  
Biologically Relevant ◽  
Earth Observation Data

Long term Earth observation data stored in Google Earth Engine (GEE) can be ingested and derived to biologically relevant environmental variables that can used as the predictors of a species niche. The aim of this research was to create a script using GEE to generate biologically meaningful environmental variables from various Earth observation data and models in Indonesia. Elevation and bathymetry raster data from GEBCO were land masked and benthic terrain modelling were done in order to get the aspect, depth, curvature, and slope. HYCOM and MODIS AQUA dataset were filtered using spatial (Indonesia and surrounding region) and temporal filter (from 2002–2017), and reduced to biologically meaningful variables, the maximum, minimum, and mean. Water speed vector (northward and eastward) data were also converted in to scalar unit. In order to fill data gaps, kriging was done using Bayesian slope. Results shows the water depth in Indonesia ranges from 0 – 6827 m, with slope ranging from 0 – 34.33°, aspect from 0 – 359.99°, and curvature from 0 – 0.94. Variables representing water energy, mean sea surface elevation ranges from 0 – 0.85 m, and mean scalar water velocity 0 – 4 m/s. Mean surface salinity ranges from 20.09 – 35.32‰. Variables representing water quality includes mean of particulate organic carbon which ranges from 25.31 – 953.47‰ and mean of clorophyll-A concentration from 0.05 – 13.63‰. These data can be used as the input for species distribution models or spatially explicit decision support systems such as Marxan for spatial planning and zonation in Marine and Coastal Zone Management Plan.

scholarly journals Temperature acclimation rate of aerobic scope and feeding metabolism in fishes: implications in a thermally extreme future

2014 ◽  
Vol 281 (1794) ◽  
pp. 20141490 ◽  
Author(s):  
Erik Sandblom ◽  
Albin Gräns ◽  
Michael Axelsson ◽  
Henrik Seth
Keyword(s):  
Metabolic Rate ◽  
Time Course ◽  
Standard Metabolic Rate ◽  
Temperature Acclimation ◽  
Specific Dynamic Action ◽  
Energetic Cost ◽  
Aerobic Scope ◽  
Postprandial Metabolism ◽  
Myoxocephalus Scorpius ◽  
Maximum Metabolic Rate

Temperature acclimation may offset the increased energy expenditure (standard metabolic rate, SMR) and reduced scope for activity (aerobic scope, AS) predicted to occur with local and global warming in fishes and other ectotherms. Yet, the time course and mechanisms of this process is little understood. Acclimation dynamics of SMR, maximum metabolic rate, AS and the specific dynamic action of feeding (SDA) were determined in shorthorn sculpin ( Myoxocephalus scorpius ) after transfer from 10°C to 16°C. SMR increased in the first week by 82% reducing AS to 55% of initial values, while peak postprandial metabolism was initially greater. This meant that the estimated AS during peak SDA approached zero, constraining digestion and leaving little room for additional aerobic processes. After eight weeks at 16°C, SMR was restored, while AS and the estimated AS during peak SDA recovered partly. Collectively, this demonstrated a considerable capacity for metabolic thermal compensation, which should be better incorporated into future models on organismal responses to climate change. A mathematical model based on the empirical data suggested that phenotypes with fast acclimation rates may be favoured by natural selection as the accumulated energetic cost of a slow acclimation rate increases in a warmer future with exacerbated thermal variations.

scholarly journals Analysis of Climate Change and Sustainable Development in Peru and Its Departments during the Year 2006 - 2018

2021 ◽  
pp. 31-46
Author(s):  
Vladimir Villarroel Diaz ◽  
Ronald Révolo Acevedo ◽  
Uriel Quispe Quezada ◽  
Elvis Carmen Delgadillo ◽  
Joel Colonio Llacua ◽  
...  
Keyword(s):  
Climate Change ◽  
Sustainable Development ◽  
Minimum Temperature ◽  
Regression Models ◽  
Environmental Data ◽  
Maximum Temperature ◽  
Climate Index ◽  
P Value ◽  
Climatic Data ◽  
General Index

Aims: Analyze and relate the general index of climate change and sustainable development of Peru and its departments during the year 2006 - 2018. Study Design:  The research is not intended to deliberately manipulate the variables, therefore, it is non-experimental; is descriptive, correlational and longitudinal. Place and Duration of Study: The research project was carried out in the Faculty of Forestry and Environmental Sciences of the UNCP, likewise the collection of information data was carried out during 2020 and 2021, due to the Covid19 pandemic. Methodology: Two economic data, four social data and five environmental data were selected, in addition climatic data of precipitation, maximum and minimum temperature of the 24 departments of Peru were collected during the years 2006 - 2018; To estimate the climatic and sustainable indices, the Prescott-Allen methodology was applied, the interpretation and assessment scale (climate change and sustainable development) was carried out using the barometric analysis of McCarthy. Five regression models were applied [dependent variable GISD; independent variable IGCC], hypothesis testing was performed using Karl Pearson's r coefficient and p-value at 0.05. Results: It is stated that Peru presents an economic sustainable index [EcSI] of 0.066 low, social sustainability [SoSI]: 0.225 medium, environmental sustainability [EnSI]: 0.282 high and general index of sustainable development [GISD] is 0.572 medium. In itself the climate index of precipitation is [CPrI]: 0.079 weak, the climate index maximum temperature [CTxI]: 0.251 severe, climate index minimum temperature [CTnI]: 0.138 weak and the general index of climate change [GICC] is 0.468 moderate. Two appropriate regression models [linear and exponential] were determined to estimate the GISD as a function of the GICC, CPrI, CTxI and CTnI. Conclusion: It was found that during the year 2006 to 2018 Peru presented a low economic, social medium, high environmental situation and therefore its sustainable development is in a medium situation; while precipitation is weak, severe maximum temperature, weak minimum temperature, and therefore, climate change has a moderate impact. Likewise, it is stated that there are two linear and exponential regression models to estimate the GISD based on the GICC, CPrI, CTxI and CTnI. It is recommended to collect more climatic data and economic indicators to be able to differentiate the economic and climatic situation that Peru and departments represent during its thirteen years of development.

scholarly journals The Effects of Temperature Acclimation on Swimming Performance in the Pelagic Mahi-Mahi (Coryphaena hippurus)

2021 ◽  
Vol 8 ◽  
Author(s):  
Rachael M. Heuer ◽  
John D. Stieglitz ◽  
Christina Pasparakis ◽  
Ian C. Enochs ◽  
Daniel D. Benetti ◽  
...  
Keyword(s):  
Swimming Performance ◽  
Distribution Patterns ◽  
Temperature Acclimation ◽  
Aerobic Scope ◽  
Broad Distribution ◽  
Swim Performance ◽  
Coryphaena Hippurus ◽  
Natural Range ◽  
Utilization Patterns ◽  
Effects Of Temperature

Mahi-mahi (Coryphaena hippurus) are a highly migratory pelagic fish, but little is known about what environmental factors drive their broad distribution. This study examined how temperature influences aerobic scope and swimming performance in mahi. Mahi were acclimated to four temperatures spanning their natural range (20, 24, 28, and 32°C; 5–27 days) and critical swimming speed (Ucrit), metabolic rates, aerobic scope, and optimal swim speed were measured. Aerobic scope and Ucrit were highest in 28°C-acclimated fish. 20°C-acclimated mahi experienced significantly decreased aerobic scope and Ucrit relative to 28°C-acclimated fish (57 and 28% declines, respectively). 32°C-acclimated mahi experienced increased mortality and a significant 23% decline in Ucrit, and a trend for a 26% decline in factorial aerobic scope relative to 28°C-acclimated fish. Absolute aerobic scope showed a similar pattern to factorial aerobic scope. Our results are generally in agreement with previously observed distribution patterns for wild fish. Although thermal performance can vary across life stages, the highest tested swim performance and aerobic scope found in the present study (28°C), aligns with recently observed habitat utilization patterns for wild mahi and could be relevant for climate change predictions.

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