Dynamic Energy Budget Theory for Metabolic Organisation

Visconti

Marine Environmental Research

et al. 2014

a b s t r a c tThe increasing abundances of the thermophilous black sea urchin Arbacia lixula in the Mediterranean Sea are attributed to the Western Mediterranean warming. However, few data are available on the potential impact of this warming on A. lixula in combination with other global stressors such as ocean acidification. The aim of this study is to investigate the interactive effects of increased temperature and of decreased pH on fertilization and early development of A. lixula. This was tested using a fully crossed design with four temperatures (20, 24, 26 and 27 C) and two pH levels (pH NBS 8.2 and 7.9). Temperature and pH had no significant effect on fertilization and larval survival (2d) for temperature <27 C. At 27 C, the fertilization success was very low (<1%) and all larvae died within 2d. Both temperature and pH had effects on the developmental dynamics. Temperature appeared to modulate the impact of decreasing pH on the % of larvae reaching the pluteus stage leading to a positive effect (faster growth compared to pH 8.2) of low pH at 20 C, a neutral effect at 24 C and a negative effect (slower growth) at 26 C. These results highlight the importance of considering a range of temperatures covering today and the future environmental variability in any experiment aiming at studying the impact of ocean acidification.

Section: Impact Of Ocean Acidification and Warming On Larval Survivalsupporting

confidence: 92%

Section: Impact Of Ocean Acidification and Warming On Larval Growthmentioning

confidence: 99%

Temperature modulates the response of the thermophilous sea urchin Arbacia lixula early life stages to CO2-driven acidification

Visconti

Marine Environmental Research

et al. 2014

Journal of Theoretical Biology

“…For the Icelandic capelin, we use a basic form of the DEB model with one food substrate and one type of reserve. These assumptions can be generalized (Kooijman, 2010).DEB theory has been successfully applied to anchovy (Engraulis engrasicolus) in the Bay of Biscay (Pecquerie et al, 2009) where their whole life cycle was modeled. The capelin and anchovies are similar fish in size and energetics, and both store energy mostly as lipids in their muscle.…”

mentioning

confidence: 99%

“…DEB theory treats individuals as nonlinear dynamics systems that follow predictable patterns during their life cycle. This approach has firm physiological roots and provides a sound basis for population dynamic theories (Nisbet et al, 2000;Kooijman, 2010). We refer to Kooijman (2010) for a full description of the DEB theory.…”

mentioning

confidence: 99%

See 1 more Smart Citation

A dynamic energy budget (DEB) model for the energy usage and reproduction of the Icelandic capelin (Mallotus villosus)

Einarsson

Birnir

Sigurðsson

2011

is closely related to bioenergetics that focuses on molecular aspects and metabolic pathways in a thermodynamic setting. DEB theory treats individuals as nonlinear dynamics systems that follow predictable patterns during their life cycle. This approach has firm physiological roots and provides a sound basis for population dynamic theories (Nisbet et al., 2000;Kooijman, 2010). We refer to Kooijman (2010) for a full description of the DEB theory. A conceptual introduction is given in Kooijman (2001), and further guides and discussion can be found in van der Meer (2006) and Sousa et al. (2008) DEB theory is ultimately the theory of life. Its aim is to describe all life forms within the same framework. The complexity of the DEB model will depend on the complexity of the species at hand. For the Icelandic capelin, we use a basic form of the DEB model with one food substrate and one type of reserve. These assumptions can be generalized (Kooijman, 2010).DEB theory has been successfully applied to anchovy (Engraulis engrasicolus) in the Bay of Biscay (Pecquerie et al., 2009) where their whole life cycle was modeled. The capelin and anchovies are similar fish in size and energetics, and both store energy mostly as lipids in their muscle. We fit the DEB parameters to the data on capelin and compare the resulting parameter values to those of the anchovies, obtaining similar results.In Section 2.2 we give a brief account of the state variables of the standard DEB model which can be found in Kooijman et al. (2008). Furthermore, we introduce a new variable to account for the roe production of individuals in Section 2.4.

Integrating Herbivore Population Dynamics Into a Global Land Biosphere Model: Plugging Animals Into the Earth System

Dangal

Tian

Lü

et al. 2017

J Adv Model Earth Syst

Mammalian herbivores are an essential component of grassland and savanna ecosystems, and with feedbacks to the climate system. To date, the response and feedbacks of mammalian herbivores to changes in both abiotic and biotic factors are poorly quantified and not adequately represented in the current global land surface modeling framework. In this study, we coupled herbivore population dynamics in a global land model (the Dynamic Land Ecosystem Model, DLEM 3.0) to simulate populations of horses, cattle, sheep, and goats, and their responses to changes in multiple environmental factors at the site level across different continents during 1980–2010. Simulated results show that the model is capable of reproducing observed herbivore population dynamics across all sites for these animal groups. Our simulation results also indicate that during this period, climate extremes led to a maximum mortality of 27% of the total herbivores in Mongolia. Across all sites, herbivores reduced aboveground net primary productivity (ANPP) and heterotrophic respiration (Rh) by 14% and 15%, respectively (p < 0.05). With adequate parameterization, the model can be used for historical assessment and future prediction of mammalian herbivore populations and their relevant impacts on biogeochemical cycles. Our simulation results demonstrate a strong coupling between primary producers and consumers, indicating that inclusion of herbivores into the global land modeling framework is essential to better understand the potentially large effect of herbivores on carbon cycles in grassland and savanna ecosystems.