scholarly journals Physiology of juvenile hydroids - High food availability mitigates stress responses of Hydractinia echinata to increasing seawater temperatures

2018 ◽  
Vol 508 ◽  
pp. 64-72
Author(s):  
Yvonne Eder ◽  
Daniel Tschink ◽  
Gabriele Gerlach ◽  
Julia Strahl
Keyword(s):  
Food Availability ◽  
Stress Responses ◽  
High Food ◽  
Hydractinia Echinata

scholarly journals Diminished growth and vitality in juvenile Hydractinia echinata under anticipated future temperature and variable nutrient conditions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Daniel Tschink ◽  
Gabriele Gerlach ◽  
Michael Winklhofer ◽  
Cora Kohlmeier ◽  
Bernd Blasius ◽  
...  
Keyword(s):  
Food Availability ◽  
Stress Responses ◽  
Energy Demand ◽  
Marine Invertebrates ◽  
Interactive Effects ◽  
Warming Climate ◽  
Hydractinia Echinata ◽  
Northern Atlantic ◽  
Biodiversity And Ecosystem Function ◽  
Numerical Growth Model

AbstractIn a warming climate, rising seawater temperatures and declining primary and secondary production will drastically affect growth and fitness of marine invertebrates in the northern Atlantic Ocean. To study the ecological performance of juvenile hydroids Hydractinia echinata we exposed them to current and predicted water temperatures which reflect the conditions in the inter- and subtidal in combination with changing food availability (high and low) in laboratory experiments. Here we show, that the interplay between temperature stress and diminished nutrition affected growth and vitality of juvenile hydroids more than either factor alone, while high food availability mitigated their stress responses. Our numerical growth model indicated that the growth of juvenile hydroids at temperatures beyond their optimum is a saturation function of energy availability. We demonstrated that the combined effects of environmental stressors should be taken into consideration when evaluating consequences of climate change. Interactive effects of ocean warming, decreasing resource availability and increasing organismal energy demand may have major impacts on biodiversity and ecosystem function.

scholarly journals Occurrence and correlation between the numbers of Black-headed Gull Chroicocephalus ridibundus and Yellow-legged Gull Larus michahellis on Kolut fish ponds (Serbia)

2015 ◽  
Vol 84 (1) ◽  
pp. 37
Author(s):  
Marko Tucakov ◽  
Milan Vogrin
Keyword(s):  
Food Availability ◽  
Fish Ponds ◽  
Early Winter ◽  
High Food ◽  
High Concentration ◽  
Aquatic Animals ◽  
Autumn Period ◽  
Larus Michahellis ◽  
The Difference ◽  
Fish Harvest

Presence and correlation between the numbers of Black-headed and Yellow-legged Gull was studies between 1998 and 2004 on Kolut fishponds in NW Serbia. Both species occurred there from February to December. Spring migration culminated in late February and early March. The period of the most intensive autumn concentration was from October to December. The difference between the numbers in all months as well as between the numbers in spring and in autumn was statistically significant. The period of the most intensive autumn passage of Yellow-legged Gull was from late October to early December. The difference between the numbers between the months was not statistically significant. A high concentration of both species in autumn and early winter was explained by high food availability during fish harvest when ponds were empty. Positive correlation between the numbers of two species thru the year indicated attractiveness of large flocks of Black-headed Gulls for Yellow-legged Gulls. This is especially true for the autumn period, when feeding niches and food is easily accessible. Correlation between the numbers of two species was negative in spring, when accesibility of aquatic animals is lower and large flocks of Black-headed Gulls are lacking.

Reproductive Tactics in an Island Population of Adders, Vipera berus (L.), with a fluctuating Food Resource

1983 ◽  
Vol 4 (1) ◽  
pp. 63-79 ◽  
Author(s):  
Göran Nilson ◽  
Claes Andren
Keyword(s):  
Mass Loss ◽  
Clutch Size ◽  
Food Availability ◽  
Prey Density ◽  
Reproductive Capacity ◽  
Relative Mass ◽  
High Food ◽  
Vipera Berus ◽  
Positive Correlations ◽  
Clutch Mass

AbstractThis paper describes the density fluctuations of the adder Vipera berus and its prey during seven years. The reproduction during high adder density and low food availability was compared with that seven years later in the same population during low adder density and high food availability. Female length was similar but weight status (mass/length 2.56) was significantly higher during high prey density. Female mass loss when giving birth and clutch mass were significantly higher during high availability of food, but relative clutch mass and relative mass loss were similar in the two situations. However, the variance in relative clutch mass was significantly lower with high prey density. Clutch size and mass per young were significantly higher during high prey density. During high food availability there were significant positive correlations between female length (~ age) and birth mass loss, female length and clutch mass, female length and clutch size, clutch mass and mass per young and between relative clutch mass and mass per young. During low food availability there were significant positive correlations between clutch mass and clutch size and relative clutch mass and clutch size. A significant negative correlation was found between female length and relative mass loss. This study do not conform entirely to general theories on reproductive adaptations to varying food availability (r-K strategies). During high prey density both more and heavier young were produced than during scarcity of food. A high correlation of reproductive parameters during high food availability indicates a maximal utilization of reproductive capacity in most females, while the lack of such correlations during low food availability indicates a varying access to food and fat storage possibility among females.

scholarly journals Maternal programming of offspring in relation to food availability in an insect ( Forficula auricularia )

2016 ◽  
Vol 283 (1828) ◽  
pp. 20152936 ◽  
Author(s):  
Shirley Raveh ◽  
Dominik Vogt ◽  
Mathias Kölliker
Keyword(s):  
Food Availability ◽  
Maternal Effects ◽  
Developmental Rate ◽  
High Food ◽  
Forficula Auricularia ◽  
Matching Effect ◽  
Food Conditions ◽  
The One ◽  
Size Adjustment ◽  
European Earwig

Maternal effects can induce adjustments in offspring phenotype to the environment experienced by the mother. Of particular interest is if mothers can programme their offspring to cope best under matching environmental conditions, but the evidence for such anticipatory maternal effects (AME) is limited. In this study, we manipulated experimentally the food availability experienced by mothers and their offspring in the European earwig ( Forficula auricularia ). Offspring produced by females that had access to high or low food quantities were cross-fostered to foster mothers experiencing matched or mismatched environments. Offspring experiencing food availability matching the one of their mothers had an increased survival to adulthood compared with offspring experiencing mismatched conditions. Females experiencing high food laid larger clutches. This clutch-size adjustment statistically explained the matching effect when offspring experienced high food, but not when experiencing low food conditions. There were no effects of matching on offspring growth and developmental rate. Overall, our study demonstrates that AME occurs in relation to food availability enhancing offspring survival to adulthood under matching food conditions.

Unusually high food availability in Kaikoura Canyon linked to distinct deep-sea nematode community

2014 ◽  
Vol 104 ◽  
pp. 310-318 ◽  
Author(s):  
D. Leduc ◽  
A.A. Rowden ◽  
S.D. Nodder ◽  
K. Berkenbusch ◽  
P.K. Probert ◽  
...  
Keyword(s):  
Food Availability ◽  
Deep Sea ◽  
Nematode Community ◽  
High Food

scholarly journals Differential cell stress responses to food availability by the nestlings of Asian Short-toed Lark (Calandrella cheleensis)

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Liang Zhang ◽  
Lidan Zhao ◽  
Xinjie Zhang ◽  
Wei Liang ◽  
Shuping Zhang
Keyword(s):  
Gene Expression ◽  
Stress Response ◽  
Food Availability ◽  
Stress Responses ◽  
Cell Stress ◽  
Gene Expression Level ◽  
Timing Of Breeding ◽  
Cell Stress Response ◽  
Sample Time ◽  
Gene Expression Levels

Abstract Background Timing of breeding season of temperate passerines has been considered to be adjusted to their food availability. There is little work to reveal the cell stress responses of the nestlings hatched asynchronized with the food abundance peak, which is important for understanding the physiological link between the timing of breeding and the fitness of offspring. Methods Using gene expression level of blood HSP70 and HSP90 as indicators, we compared the cell stress response of Asian Short-toed Lark (Calandrella cheleensis) nestlings hatched under conditions of low, mid or high food (grasshopper nymph) availability in 2017. Results Nymph biomass, sample time and interaction of these two factors significantly influenced the blood gene expression level of HSP70 and HSP90 of Asian Short-toed Lark nestlings. HSP70 and HSP90 gene expression levels of the nestlings at 14:00 were significantly higher than those at 5:00. At either 5:00 or 14:00, the gene expression levels of HSP70 and HSP90 increase with the decrease of nymph biomass. Conclusions These results indicate that food availability is an important environment factor inducing cellular stress of Asian Short-toed Lark nestlings. The interactive effect of the nymph abundance and sample time on the HSPs response may be related with the daily temperature variation of the grassland. Over cell stress response may be one of physiological factor mediating the effect of food availability and the nestling’s fitness.

scholarly journals Animal abundance and food availability: some comments

2001 ◽  
Vol 81 (6) ◽  
pp. 1065-1068 ◽  
Author(s):  
J.J. Beukema ◽  
G.C. Cadée
Keyword(s):  
Food Availability ◽  
Environmental Conditions ◽  
Benthic Invertebrates ◽  
Food Supply ◽  
Wadden Sea ◽  
High Food ◽  
Soft Bottom ◽  
Animal Abundance ◽  
Primary Consumers

We challenge a conclusion reached by Barnes & de Villiers in a paper that was recently published in this Journal, viz that certain benthic invertebrates occur in lower abundances in lagoons than in intertidal soft-bottom areas and that this difference is due to lower food supply at lagoon bottoms. Our experience in the Wadden Sea shows that food does not limit the abundance of primary consumers in areas where environmental conditions are harsh. Such conditions prevail in most of the upper half of the intertidal which is characterized by low abundance of zoobenthos despite a high food supply.

Triploid lion-paw scallop (Nodipecten subnodosus Sowerby); growth, gametogenesis, and gametic cell frequencies when grown at a high food availability site

Aquaculture ◽  
2004 ◽  
Vol 235 (1-4) ◽  
pp. 185-205 ◽  
Author(s):  
Rosalı́o Maldonado-Amparo ◽  
José L Ramı́rez ◽  
Susana Ávila ◽  
Ana M Ibarra
Keyword(s):  
Food Availability ◽  
High Food
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