scholarly journals Growth, population dynamics, and reproductive output model of the non-zooxanthellate temperate solitary coral Caryophyllia inornata (Scleractinia, Caryophylliidae)

2017 ◽  
Vol 62 (3) ◽  
pp. 1111-1121 ◽  
Author(s):  
Erik Caroselli ◽  
Francesco Ricci ◽  
Viviana Brambilla ◽  
Chiara Marchini ◽  
Giada Tortorelli ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Reproductive Output ◽  
Solitary Coral

scholarly journals Weather and food availability additively affect reproductive output in an expanding raptor population

Oecologia ◽  
2021 ◽  
Author(s):  
Melanie Nägeli ◽  
Patrick Scherler ◽  
Stephanie Witczak ◽  
Benedetta Catitti ◽  
Adrian Aebischer ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Food Availability ◽  
Reproductive Output ◽  
Weather Conditions ◽  
Interactive Effects ◽  
Food Supplementation ◽  
Nestling Development ◽  
Trade Offs ◽  
Adverse Weather ◽  
Expanding Population

AbstractThe joint effects of interacting environmental factors on key demographic parameters can exacerbate or mitigate the separate factors’ effects on population dynamics. Given ongoing changes in climate and land use, assessing interactions between weather and food availability on reproductive performance is crucial to understand and forecast population dynamics. By conducting a feeding experiment in 4 years with different weather conditions, we were able to disentangle the effects of weather, food availability and their interactions on reproductive parameters in an expanding population of the red kite (Milvus milvus), a conservation-relevant raptor known to be supported by anthropogenic feeding. Brood loss occurred mainly during the incubation phase, and was associated with rainfall and low food availability. In contrast, brood loss during the nestling phase occurred mostly due to low temperatures. Survival of last-hatched nestlings and nestling development was enhanced by food supplementation and reduced by adverse weather conditions. However, we found no support for interactive effects of weather and food availability, suggesting that these factors affect reproduction of red kites additively. The results not only suggest that food-weather interactions are prevented by parental life-history trade-offs, but that food availability and weather conditions are crucial separate determinants of reproductive output, and thus population productivity. Overall, our results suggest that the observed increase in spring temperatures and enhanced anthropogenic food resources have contributed to the elevational expansion and the growth of the study population during the last decades.

Life history and population dynamics of the exotic snail Potamopyrgus antipodarum (Prosobranchia : Hydrobiidae) in Lake Purrumbete, Victoria, Australia

1998 ◽  
Vol 49 (1) ◽  
pp. 73 ◽  
Author(s):  
E. S. G. Schreiber ◽  
A. Glaister ◽  
G. P. Quinn ◽  
P. S. Lake
Keyword(s):  
Population Dynamics ◽  
Reproductive Output ◽  
Size Structure ◽  
Seasonal Pattern ◽  
Potamopyrgus Antipodarum ◽  
Seasonal Patterns ◽  
High Fecundity ◽  
Successful Invader ◽  
Density Population ◽  
Different Levels

The density, population size-structure, and fecundity of the exotic snail Potamopyrgus antipodarum are described, for a period of two years, on two shores subject to different levels of disturbance in Lake Purrumbete. The population dynamics of Potamopyrgus antipodarum showed the same seasonal pattern in the numbers of embryos carried per individual female in both years, but seasonal patterns in density and potential reproductive output of the population differed between shores. Densities of Potamopyrgus antipodarum were high, with a trend for highest densities to occur in spring and summer. The population consisted almost entirely of females, which is indicative of a parthenogenic mode of reproduction. Fecundity was high, with the number of embryos carried per female peaking in spring. In summer, the population was dominated by small individuals, but some small snails were present at all times of the year. Potamopyrgus antipodarum was found to be a very successful invader of Lake Purrumbete, with high densities, high fecundity, parthenogenesis and the presence of embryos throughout the year contributing to this success.

scholarly journals Long-Term Effects of Elevated Co2 on the Population Dynamics of The Seagrass Cymodocea Nodosa: Evidence from Volcanic Seeps

2020 ◽  
Author(s):  
Amrit Kumar Mishra ◽  
Susana Cabaco ◽  
Carmen de los Santos ◽  
Eugenia Apostolaki ◽  
Salvatrice Vizzini ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Elevated Co2 ◽  
Reproductive Output ◽  
Cymodocea Nodosa ◽  
Long Term Effects ◽  
Production Rates ◽  
Population Reconstruction ◽  
Short And Long Term ◽  
First Time

We used population reconstruction techniques to assess for the first time the population dynamics of a seagrass, Cymodocea nodosa, exposed to long-term elevated CO2 near three volcanic seeps and compare them with reference sites away from the seeps. Under high CO2, the density of shoots and of individuals (apical shoots), and the vertical and horizontal elongation and production rates, were higher. Nitrogen effects on rhizome elongation and production rates and on biomass, were stronger than CO2 as these were highest at the location where the availability of nitrogen was highest. At the seep where the availability of CO2 was highest and nitrogen lowest, density of shoots and individuals were highest, probably due to CO2 effects on shoot differentiation and induced reproductive output, respectively. In all three seeps there was higher short- and long-term recruitment and growth rates around zero, indicating that elevated CO2 increases the turnover of C. nodosa shoots.

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