Modeling the refuge effect of submerged macrophytes in ecological dynamics of shallow lakes: A new model of fish functional response

2010 ◽  
Vol 221 (17) ◽  
pp. 2076-2085 ◽  
Author(s):  
Junmin Li ◽  
Ping Huang ◽  
Renduo Zhang
Keyword(s):  
Functional Response ◽  
Shallow Lakes ◽  
Submerged Macrophytes ◽  
Ecological Dynamics ◽  
New Model ◽  
Refuge Effect

scholarly journals Quantitative Assessment of Ammonia-Oxidizing Bacterial Communities in the Epiphyton of Submerged Macrophytes in Shallow Lakes

2010 ◽  
Vol 76 (6) ◽  
pp. 1813-1821 ◽  
Author(s):  
M. Coci ◽  
G. W. Nicol ◽  
G. N. Pilloni ◽  
M. Schmid ◽  
M. P. Kamst-van Agterveld ◽  
...  
Keyword(s):  
16S Rrna ◽  
Shallow Lakes ◽  
Submerged Macrophytes ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Gene Copy ◽  
Potamogeton Pectinatus ◽  
Rrna Gene ◽  
Ammonia Oxidizing Bacteria ◽  
Potential Nitrification

ABSTRACT In addition to the benthic and pelagic habitats, the epiphytic compartment of submerged macrophytes in shallow freshwater lakes offers a niche to bacterial ammonia-oxidizing communities. However, the diversity, numbers, and activity of epiphytic ammonia-oxidizing bacteria have long been overlooked. In the present study, we analyzed quantitatively the epiphytic communities of three shallow lakes by a potential nitrification assay and by quantitative PCR of 16S rRNA genes. On the basis of the m2 of the lake surface, the gene copy numbers of epiphytic ammonia oxidizers were not significantly different from those in the benthic and pelagic compartments. The potential ammonia-oxidizing activities measured in the epiphytic compartment were also not significantly different from the activities determined in the benthic compartment. No potential ammonia-oxidizing activities were observed in the pelagic compartment. No activity was detected in the epiphyton of Chara aspera, the dominant submerged macrophyte in Lake Nuldernauw in The Netherlands. The presence of ammonia-oxidizing bacterial cells in the epiphyton of Potamogeton pectinatus was also demonstrated by fluorescent in situ hybridization microscopy images. By comparing the community composition as assessed by the 16S rRNA gene PCR-denaturing gradient gel electrophoresis approach, it was concluded that the epiphytic ammonia-oxidizing communities consisted of cells that were also present in the benthic and pelagic compartments. Of the environmental parameters examined, only the water retention time, the Kjeldahl nitrogen content, and the total phosphorus content correlated with potential ammonia-oxidizing activities. None of these parameters correlated with the numbers of gene copies related to ammonia-oxidizing betaproteobacteria.

Global Stability of a Non-Smooth Predator–Prey System with Holling I Functional Response and Refuge Effect

2014 ◽  
Vol 595 ◽  
pp. 283-288 ◽  
Author(s):  
Yuan Tian ◽  
Hai Ting Sun ◽  
Yu Xia He
Keyword(s):  
Global Stability ◽  
Functional Response ◽  
Tangent Point ◽  
Predator Prey ◽  
Predator Prey Model ◽  
Refuge Effect ◽  
Prey System ◽  
Trivial Equilibrium ◽  
The Stability ◽  
Regular Equilibrium

This paper analyses the dynamics of a non-smooth predator-prey model with refuge effect, where the functional response is taken as Holling I type. To begin with, some preliminaries and the existence of regular, virtual, pseudo-equilibrium and tangent point are established. Then, the stability of trivial equilibrium and predator free equilibrium is discussed. Furthermore, it is shown that the regular equilibrium and the pseudo-equilibrium cannot coexist. Finally, the conclusion is given.

scholarly journals Seasonality and Species Specificity of Submerged Macrophyte Biomass in Shallow Lakes Under the Influence of Climate Warming and Eutrophication

2021 ◽  
Vol 12 ◽  
Author(s):  
Haoping Wu ◽  
Beibei Hao ◽  
Hyunbin Jo ◽  
Yanpeng Cai
Keyword(s):  
Climate Warming ◽  
Shallow Lakes ◽  
Nutrient Enrichment ◽  
Plant Biomass ◽  
Submerged Macrophytes ◽  
Anthropogenic Activities ◽  
Species Specificity ◽  
Growth Responses ◽  
Potamogeton Crispus ◽  
Explanatory Factors

Climate warming and eutrophication caused by anthropogenic activities strongly affect aquatic ecosystems. Submerged macrophytes usually play a key role in shallow lakes and can maintain a stable clear state. It is extremely important to study the effects of climate warming and eutrophication on the growth of submerged macrophytes in shallow lakes. However, the responses of submerged macrophytes to climate warming and eutrophication are still controversial. Additionally, the understanding of the main pathways impacting submerged macrophytes remains to be clarified. In addition, the influence of seasonality on the growth responses of submerged macrophytes to climate warming and eutrophication requires further elucidation. In this study, we conducted a series of mesocosm experiments with four replicates across four seasons to study the effects of rising temperature and nutrient enrichment on the biomass of two submerged macrophytes, Potamogeton crispus and Elodea canadensis. Our results demonstrated the seasonality and species specificity of plant biomass under the influence of climate warming and eutrophication, as well as the main explanatory factors in each season. Consistent with the seasonal results, the overall results showed that E. canadensis biomass was directly increased by rising temperature rather than by nutrient enrichment. Conversely, the overall results showed that P. crispus biomass was indirectly reduced by phosphorus enrichment via the strengthening of competition among primary producers. Distinct physiological and morphological traits may induce species-specific responses of submerged macrophytes to climate warming and eutrophication, indicating that further research should take interspecies differences into account.

Modeling Refuge Effect of Submerged Macrophytes in Lake System

2016 ◽  
Vol 78 (4) ◽  
pp. 662-694 ◽  
Author(s):  
Dongyu Lv ◽  
Meng Fan ◽  
Yun Kang ◽  
Krystal Blanco
Keyword(s):  
Submerged Macrophytes ◽  
Lake System ◽  
Refuge Effect

Ambiguous climate impacts on competition between submerged macrophytes and phytoplankton in shallow lakes

2011 ◽  
Vol 56 (8) ◽  
pp. 1540-1553 ◽  
Author(s):  
SARIAN KOSTEN ◽  
ERIK JEPPESEN ◽  
VERA L.M. HUSZAR ◽  
NÉSTOR MAZZEO ◽  
EGBERT H. Van NES ◽  
...  
Keyword(s):  
Shallow Lakes ◽  
Submerged Macrophytes ◽  
Climate Impacts

scholarly journals Wave forces limit the establishment of submerged macrophytes in large shallow lakes

2015 ◽  
Vol 60 (5) ◽  
pp. 1536-1549 ◽  
Author(s):  
Bastiaan G. Van Zuidam ◽  
Edwin T. H. M. Peeters
Keyword(s):  
Shallow Lakes ◽  
Submerged Macrophytes ◽  
Wave Forces

scholarly journals Effects of Sediments Phosphorus Inactivation on the Life Strategies of Myriophyllum spicatum: Implications for Lake Restoration

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2112
Author(s):  
Zhenmei Lin ◽  
Chen Zhong ◽  
Guolong Yu ◽  
Yishu Fu ◽  
Baohua Guan ◽  
...  
Keyword(s):  
Shallow Lakes ◽  
Root Biomass ◽  
Submerged Macrophytes ◽  
Myriophyllum Spicatum ◽  
Morphological Characteristics ◽  
Shoot Biomass ◽  
Lake Ecosystem ◽  
Total Biomass ◽  
Life Strategies ◽  
Eutrophic Lakes

Eutrophication often results in the loss of submerged vegetation in shallow lakes and turns the lake to be a turbid state. Recovery of submerged macrophytes is the key in the restoration of shallow eutrophic lakes to create a clear water state. However, internal loading control was considered as the critical process for the recovery of submerged macrophytes in shallow lakes after the external nutrient reduction. Phoslock® (Lanthanum modified bentonite) is a useful passivation material in controlling the internal loadings (release of phosphorus from the sediments), which was applied to restore the eutrophic lakes. However, the effects of Phoslock® on the growth and life strategies of submerged macrophytes are less focused so far. In the present study, we studied the responses in the growth and morphological characteristics of Myriophyllum spicatum to the addition of Phoslock® to the sediments. Our results showed that the addition of Phoslock® significantly decreased the contents of bioavailable forms of phosphorus in the sediments, such as redox-sensitive phosphorus bound to Fe and Mn compounds (BD–P), phosphorus bound to aluminum (Al–P) and organic phosphorus (Org–P). However, the concentration of the non-bioavailable forms of phosphorus in the sediments, such as calcium bound phosphorus (Ca–P), increased significantly in the Phoslock® treatments compared with the controls. At the end of the experiments, the total biomass, aboveground biomass and relative growth rate (RGR) of M. spicatum decreased significantly in the Phoslock® mesocosms compared with the controls. In contrast, the wet root biomass, root–shoot biomass ratio, root numbers and root length of M. spicatum were significantly higher in the Phoslock® treatments than that in the controls. Our results indicated that the growth of M. spicatum was suppressed by the addition of Phoslock®, and thus the biomass was decreased; however, the increase of root biomass might be beneficial to the inhibition of phosphorus release and resuspension of sediments and to the restoration of the lake ecosystem.

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