Models on the Slope of, and Biomass Flow up, the Biomass Size Spectrum

1987 ◽  
Vol 44 (S2) ◽  
pp. s136-s140 ◽  
Author(s):  
Uwe Borgmann
Keyword(s):  
Somatic Growth ◽  
Production Data ◽  
Food Chains ◽  
Size Spectrum ◽  
Allometric Relationship ◽  
Complex Models ◽  
Simple Equations ◽  
Growth And Reproduction ◽  
Biomass Size Spectrum ◽  
Number Of Authors

A comparison is made between the different models of the biomass size spectrum proposed by a number of authors. Though superficially dissimilar, the models are all mathematically compatible if the differences in their underlying assumptions are taken into account. The simplest model does not consider the complexities of food webs over food chains, somatic growth, or the continuous nature of the size spectrum. Comparison with the more complex models, however, shows that these omissions do not seriously affect the slope of the size spectrum. For example, one model predicts that the effects of somatic growth and reproduction cancel if cohort biomasses remain relatively constant as the cohorts mature. If growth rate is related to body size in an allometric relationship and reproduction is ignored, then another model gives a slightly different slope (higher by roughly 0.03). If the same assumptions are used in both models, however, they give compatible results. Some simple equations are suggested for routine application in size spectrum analysis of biomass and production data.

Effect of Somatic Growth and Reproduction on Biomass Transfer up Pelagic Food Webs as Calculated from Particle-Size-Conversion Efficiency

1983 ◽  
Vol 40 (11) ◽  
pp. 2010-2018 ◽  
Author(s):  
Uwe Borgmann
Keyword(s):  
Particle Size ◽  
Food Web ◽  
Food Webs ◽  
Conversion Efficiency ◽  
Somatic Growth ◽  
Mysis Relicta ◽  
Biomass Transfer ◽  
Pelagic Food Webs ◽  
Simple Equations ◽  
Growth And Reproduction

Biomass or energy transfer up pelagic food webs to larger sized organisms is a function of (1) direct trophic level transfer through predation, (2) somatic growth, a process that augments biomass transfer through predation, and (3) reproduction, which impedes biomass transfer by moving biomass down the food web to smaller sizes. By assuming that particle-size-conversion efficiency (log (food consumed/biomass produced)/log (predator–prey size ratio)) is relatively constant, I derive simple equations to calculate the effect of somatic growth and reproduction on biomass transfer up the food web. This defines the conditions under which somatic growth and reproduction can be ignored and biomass flow can be calculated from predation alone, using a previously developed model. When these conditions are not met, the effect of somatic growth and reproduction can be calculated from data on cohort growth and mortality rates. It is not necessary to identify the food of any species. This eliminates one of the problems often encountered when modeling food webs. I have applied these equations to production of Mysis relicta. If the estimates of Mysis abundance and growth rates are correct, then size-corrected production is about 25% greater for this species when somatic growth is accounted for in the calculations. This is because mortality of young Mysis appears to be low and most production occurs during somatic growth and not during reproduction.

scholarly journals Combined effects of food quality and temperature on somatic growth and reproduction of two freshwater cladocerans

2009 ◽  
Vol 54 (4) ◽  
pp. 1323-1332 ◽  
Author(s):  
HÉlène Masclaux ◽  
Alexandre Bec ◽  
Martin J. Kainz ◽  
Christian Desvilettes ◽  
Lionel Jouve ◽  
...  
Keyword(s):  
Food Quality ◽  
Somatic Growth ◽  
Combined Effects ◽  
Growth And Reproduction

scholarly journals Evaluation of Fish Communities in Daya Bay Using Biomass Size Spectrum and ABC Curve

2021 ◽  
Vol 9 ◽  
Author(s):  
Shannan Xu ◽  
Jianzhong Guo ◽  
Yong Liu ◽  
Jiangtao Fan ◽  
Yayuan Xiao ◽  
...  
Keyword(s):  
Fish Communities ◽  
Breeding Population ◽  
Trophic Levels ◽  
Daya Bay ◽  
Size Spectrum ◽  
The Status ◽  
Unimodal Pattern ◽  
Severe Disturbance ◽  
Main Factor ◽  
Biomass Size Spectrum

Based on the data collected by four trawl surveys during 2016–2017, we applied biomass size spectrum (BSS) and abundance–biomass comparison (ABC) curve to assess the status of fish communities’ status in Daya Bay, China. Our findings indicated a unimodal pattern and biomass size ranged from −2 to 10 grain levels and the pattern of the Sheldon-type BSS of fish in Daya Bay. Moreover, fishes in the range of four to eight size class were relatively abundant. The highest peak belonged to the two to four grain level (log2 size bins), mainly consisting of Leiognathus brevirostris, Callionymus meridionalis, Callionymus koreanus, Evynnis cardinalis, Trachurus japonicus, and other small fishes. The curves of the BSS in spring and winter were relatively flat and comprised a large curvature. The summer and autumn curves were comparatively steep, and the seasonal curvature was small. The curvatures of the curve were mainly related to a large number of small Evynnis cardinalis and a small number of large-sized Harpadon nehereus and Leiognathus ruconius. In our study, it was observed that the number and the size of the breeding population, trophic levels, migration habits, and other life history characteristics, as well as anthropogenic disturbances (especially overfishing), significantly affected the peak shape, slope, or curvature of the fish BSS, with overfishing being the main factor. The ABC curve exhibited that Daya Bay was in a critical state of disturbance throughout the year. The spring, summer, and autumn were in severe disturbance, while the winter was in moderate disturbance.

Life history characteristics of the potentially invasive Ponto-Caspian goby Neogobius fluviatilis in natural lakes from its native range (Black Sea region of Turkey)

2018 ◽  
Vol 69 (10) ◽  
pp. 1544 ◽  
Author(s):  
Uǧur Karakuş ◽  
Nildeniz Top ◽  
Erdi Gökhan Tepeköy ◽  
John Robert Britton ◽  
Ali Serhan Tarkan
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Somatic Growth ◽  
Reproductive Traits ◽  
Native Range ◽  
Black Sea Region ◽  
Factors Affecting ◽  
Natural Lakes ◽  
Key Factor ◽  
Growth And Reproduction

The aim of this study was to provide baseline data and fill an outstanding knowledge gap in our understanding of factors affecting the invasiveness of the Ponto-Caspian gobiid Neogobius fluviatilis. To this end, the life history traits (as somatic growth and reproduction) of N. fluviatilis were studied in three natural freshwater lakes in its native range. These populations were characterised by slow somatic growth rates, being the slowest reported across all the native and non-native ranges of N. fluviatilis. Ages were recorded to 7 years. Across the three lakes, there was considerable variability in sex ratios and reproductive traits (including length at maturity and fecundity at length and age), revealing considerable interpopulation variability. These data suggest that N. fluviatilis has considerable plasticity in the expression of its life history traits, with this plasticity argued as a key factor in facilitating the ability of N. fluviatilis to establish and invade new waters following introductions.

Vallisneria natans detritus supports Daphnia magna somatic growth and reproduction under addition of periphyton

2021 ◽  
Author(s):  
Yali Tang ◽  
Daiying Zhou ◽  
Ling Su ◽  
Zhengwen Liu ◽  
Xiufeng Zhang ◽  
...  
Keyword(s):  
Daphnia Magna ◽  
Somatic Growth ◽  
Vallisneria Natans ◽  
Growth And Reproduction
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