Ecosystem Network Analysis in a Smallholder Integrated Crop–Livestock System for Coastal Lowland Situation in Tropical Humid Conditions of India
Abstract
:1. Introduction
2. Material and Methods
2.1. Experimental Site and Experimental Details
2.2. Ecopath Data
2.3. Ecological Groups and Input Data
2.3.1. Rice (Oryza sativa L.)
2.3.2. Vegetables (Chili and Baby Corn)
2.3.3. Pulses (Cowpea and Moong)
2.3.4. Weeds and Fodder
2.3.5. Aquatic Weeds
2.3.6. Phytoplankton (Diatoms, Dinoflagellates and Blue Green Algae)
2.3.7. Fruit Crops (Papaya, Carica papaya L. and Banana, Musa acuminate Colla.)
2.3.8. Trees (Mango, Mangifera indica L.)
2.3.9. Ruminants (2 Cross-Bred Cows)
2.3.10. Poultry
2.3.11. Fish (Rohu (Labeo rohita, F. Hamilton), Catla (Catla catla, F. Hamilton) and Common carp (Cyprinus carpio, L.) at 50:25:25 Ratio)
2.3.12. Detritus and Benthic Nitrogen Fixers (BNF)
2.4. Ecosystem Modelling of Lowland Integrated Crop–Livestock System (ICLS)
2.5. Trophic Relationships in the Model
2.6. Balancing the Model and Pedigree Index
2.7. Ecosystem Statistics and Network Indices
3. Results
3.1. Mass-Balanced Model and Ecological Structure
3.2. Ecotrophic Efficiency
3.3. Gross Efficiency (GE)
3.4. Ecosystem Properties and Network Indices
3.5. Mean Trophic Level and Keystone Groups
4. Discussion
4.1. Ecosystem Features and Organization
4.2. Ecosystem Performance Indicators
4.3. Nutrient Balances in the Integrated Crop-Livestock System (ICLS)
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Group Name | Value (kg N ha−1 year−1) | |
---|---|---|
1 | Pulses | 6.79 |
2 | Rice | 20.42 |
3 | Vegetables | 0.75 |
4 | Weeds | 0 |
5 | Aquatic weeds | 5.5 |
6 | Phytoplankton | 0 |
7 | Fruit crops | 0.16 |
8 | Trees | 2.86 |
9 | Poultry | 7.36 |
10 | Ruminants | 8.32 |
11 | Fish | 4.62 |
12 | Benthic Nitrogen Fixers | 0 |
13 | Detritus | 0 |
14 | Sum | 56.18 |
Prey\Predator | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | |
---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Pulses | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.01 | 0 |
2 | Rice | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.1 | 0.1 | 0 |
3 | Vegetables | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
4 | Weeds | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.8 | 0 |
5 | Aquatic weeds | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0.05 |
6 | Phytoplankton | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.75 |
7 | Fruit crops | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
8 | Trees | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
9 | Poultry | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
10 | Ruminants | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
11 | Fish | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
12 | Benthic Nitrogen Fixers | 0.5 | 0 | 0.4 | 0.2 | 0.2 | 0.1 | 0.2 | 0.5 | 0 | 0 | 0 |
13 | Detritus | 0.5 | 1 | 0.6 | 0.8 | 0.8 | 0.9 | 0.8 | 0.5 | 0 | 0 | 0.2 |
14 | Import | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.8 | 0.09 | 0 |
15 | Sum | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 |
Performance Indicator | Definition | Significance |
---|---|---|
Functional group (FG) | A group of single species, individuals of same size/age or ecologically related species | The number and type of functional groups determines the diversity of the ecosystem |
Sum of all consumption (t km−2 year−1) (SC) | Total consumption within the ecosystem | Structure of the ecosystem |
Sum of all exports (t km−2 year−1) (SE) | Total exports from the ecosystem | Structure of the ecosystem |
Sum of all flows into detritus (t km−2 year−1) (SD) | Total flows to detritus within the ecosystem | Structure of the ecosystem |
Sum of all production (t km−2 year−1) (SP) | Summation of all production within the ecosystem | Structure of the ecosystem |
Total system throughput (t km−2 year−1) (TST) | Summation of all trophic flows (total consumption + total export + total respiration + total flows to detritus) in the ecosystem | Provides an idea about the size of the ecosystem |
Mean trophic level of the ecosystem (MTL) | Weighted mean value of all trophic levels in the ecosystem | Gives the overall picture of the trophic network in the ecosystem |
Gross efficiency (GE) | Ratio between the total harvests and NPP in the ecosystem | Represents the harvest of groups in an ecosystem with respect to inputs |
Net system production (t km−2 year−1) (NSP) | This is the difference between total primary production and total respiration | Maturity of the ecosystem, it will be high in immature ecosystems and close to zero in mature ones |
Total biomass (exc. detritus) (t km−2 year−1) (B) | Total biomass of all functional groups except detritus | Gives the carrying capacity within the ecosystem |
Total primary production/B (P/B) | Ratio between total primary production and total biomass in the ecosystem | Maturity of the ecosystem, in mature ecosystems, the ratio will be low |
Total primary production/respiration (PP/R) | Ratio between total primary production and total respiration in the ecosystem | Maturity of the ecosystem, this index demonstrates values greater than unity in immature ecosystems |
Total biomass/TST (TB/TST) | Ratio between total biomass and TST | Maturity of the ecosystem, maximum values (close to 1) will be observed for mature ecosystems |
System omnivory index (SOI) | Average omnivory indices of all consumers weighted by the logarithm of each consumer’s food intake | Maturity of the ecosystem, it yields higher values in mature ecosystems (>0.5) |
Mean path length (MPL) | Average ecological distance between various pathways in the food web | Maturity of the ecosystem, higher values denote maturity of ecosystems |
Finn’s cycling index (FCI) | The recycled fraction of the ecosystem’s TST | Maturity and stability of the ecosystem, higher values show more mature and resilient ecosystems |
Ascendency (%) (A) | This measures the extent of balance of food web in an ecosystem. It is in contrast to system overhead | Maturity of the ecosystem, higher values for this index indicate maturity of the system (>50%) |
System overhead (%) (SO) | Energy in balance for an ecosystem. It is contrast to ascendency | Stability of the ecosystem, in stable and resilient ecosystems, the value will be high (>50%) |
Ecopath pedigree index (PI) | The pedigree of input data showing the origin of an input data | This index provides the extent of validity of the model based on the input data. If the model is based on local data, the index will be more than 0.6 |
Group Name | Trophic Level | Biomass (kg N ha−1 year−1) | P/B | Q/B | EE | P/Q | |
---|---|---|---|---|---|---|---|
1 | Pulses | 2 | 23.56 | 2 | 2 | 0.20 | 1.00 |
2 | Rice | 2 | 60.1 | 2 | 2 | 0.96 | 1.00 |
3 | Vegetables | 2 | 0.75 | 2 | 2 | 0.34 | 1.00 |
4 | Weeds and fodder | 2 | 100.4 | 2 | 2 | 0.96 | 1.00 |
5 | Aquatic weeds | 2 | 40.65 | 2 | 2 | 0.96 | 1.00 |
6 | Phytoplankton | 2 | 4.8 | 24 | 24 | 0.24 | 1.00 |
7 | Fruit crops | 1 | 50.6 | 0.14 | 0.14 | 0.62 | 1.00 |
8 | Trees | 2 | 10.6 | 0.55 | 0.55 | 0.39 | 1.00 |
9 | Poultry | 3 | 2.32 | 4.2 | 304.4 | 0.72 | 0.01 |
10 | Ruminants | 3 | 8.704 | 2.26 | 27.8 | 0.17 | 0.08 |
11 | Fish | 2.8 | 2.38 | 1.95 | 15.2 | 0.99 | 0.13 |
12 | BNF | 1 | 5.6 | 34 | 0 | 0.50 | |
13 | Detritus | 1 | 1800 |
Parameter | Value |
---|---|
Sum of all consumption (kg N ha−1 year−1) | 1562.33 |
Sum of all exports (kg N ha−1 year−1) | −427.35 |
Total system throughput (kg N ha−1 year−1) (TST) | 1134.98 |
Sum of all production (kg N ha−1 year−1) | 802.43 |
Mean trophic level of the functional groups | 2.34 |
Gross efficiency (harvest/net p.p.) (GE) | 0.30 |
Calculated total net primary production (kg N ha−1 year−1) (NPP) | 190.40 |
Total primary production/total biomass (PP/B) | 0.61 |
Total biomass/total system throughput (TB/TST) | 0.27 |
Total biomass (excluding detritus) | 309.93 |
Total harvest (kg N ha−1 year−1) | 56.18 |
System omnivory index (SOI) | 0.09 |
Finn’s cycling index | 16.60 |
Mean path length | 3.50 |
Ascendency (%) (A) | 40.40 |
System overhead (%) (SO) | 59.60 |
Food self-sufficiency ratio | 7.64 |
Ecopath pedigree index | 0.84 |
Measure of fit, t* | 5.31 |
Shannon diversity | 2.52 |
Group Name | Keystone Index | Keystone Index #2 | Relative Total Impact | |
---|---|---|---|---|
1 | Pulses | −0.48 | 0.66 | 0.39 |
2 | Rice | −0.31 | 0.49 | 0.67 |
3 | Vegetables | −2.27 | 0.87 | 0.0059 |
4 | Weeds | −0.44 | 0.21 | 0.59 |
5 | Aquatic weeds | −0.64 | 0.29 | 0.29 |
6 | Phytoplankton | −0.38 | 1.42 | 0.46 |
7 | Fruit crops | −2.35 | −1.48 | 0.006 |
8 | Trees | −1.01 | 0.46 | 0.11 |
9 | Poultry | −0.053 | 2.07 | 1.00 |
10 | Ruminants | −0.28 | 1.27 | 0.59 |
11 | Fish | −0.27 | 1.84 | 0.60 |
12 | BNF | −0.24 | 1.50 | 0.64 |
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Paramesh, V.; Sreekanth, G.B.; Chakurkar, E.B.; Chethan Kumar, H.B.; Gokuldas, P.; Manohara, K.K.; Ramdas Mahajan, G.; Rajkumar, R.S.; Ravisankar, N.; Panwar, A.S. Ecosystem Network Analysis in a Smallholder Integrated Crop–Livestock System for Coastal Lowland Situation in Tropical Humid Conditions of India. Sustainability 2020, 12, 5017. https://doi.org/10.3390/su12125017
Paramesh V, Sreekanth GB, Chakurkar EB, Chethan Kumar HB, Gokuldas P, Manohara KK, Ramdas Mahajan G, Rajkumar RS, Ravisankar N, Panwar AS. Ecosystem Network Analysis in a Smallholder Integrated Crop–Livestock System for Coastal Lowland Situation in Tropical Humid Conditions of India. Sustainability. 2020; 12(12):5017. https://doi.org/10.3390/su12125017
Chicago/Turabian StyleParamesh, Venkatesh, Giri Bhavan Sreekanth, Eaknath. B. Chakurkar, H.B. Chethan Kumar, Parappurath Gokuldas, Kallakeri Kannappa Manohara, Gopal Ramdas Mahajan, Racharla Solomon Rajkumar, Natesan Ravisankar, and Azad Singh Panwar. 2020. "Ecosystem Network Analysis in a Smallholder Integrated Crop–Livestock System for Coastal Lowland Situation in Tropical Humid Conditions of India" Sustainability 12, no. 12: 5017. https://doi.org/10.3390/su12125017