Preliminary Ecopath model of a tropical coastal estuarine ecosystem around bight of Benin, Nigeria

Abdul, W. O.; Adekoya, E. O.

doi:10.1007/s10641-016-0532-7

Cited by 15 publications

(5 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, high EE values calculated for zooplankton and Mullidae suggest that they are used by many groups of organisms (Christensen et al, 2000). Consistent with this result, there are reports from Benin inshore waters in Nigeria (Abdul & Adekoya, 2016) and an offshore ecosystem in Sri Lanka (Haputhantria et al, 2008). On the other hand, our data showed the least EE values in N. japonicas and S. sihama, indicating that a few predators feed on these food chains (Christensen et al, 2000).…”

Section: Sauridasupporting

confidence: 89%

“…The value of this index ranges from a likelihood of zero for ambiguous data to 1 for the best data (Behera et al, 2020;Villanueva et al, 2008). Our estimated value for this index was 0.38, which is similar to the (0.36), obtained in an estuarine ecosystem in Nigeria (Abdul & Adekoya, 2016), but lower than the (0.19), reported for India's Bay of Bengal (Dutta et al, 2017). Based on the results, however, the Ecopath model prepared for the Kolahi to Dargahan region has good quality.…”

Section: Ta B L Esupporting

confidence: 84%

See 1 more Smart Citation

Trophic structure using ecological relationships between five dominant commercial fish in Kolahi to Dargahan

et al. 2023

View full text Add to dashboard Cite

The purpose of this study was to determine the effects of frequent species population fluctuations and the impact of different rates of exploitation on other ecological links in the food web. The mass-balanced Ecopath model represents the trophic interactions among the 31 defined functional groups in the Kolahi to Dargahan area, with five main species, including Trichiurus lepturus, Saurida tumbil, Nemipterus japonicus, Sillago sihama, and Cynoglossus arel (from April 2018 to April 2019). To investigate the effects of fishing and environmental disturbances, the Ecopath modeling approach combines software for analyzing ecosystem trophic-level balances with population dynamic models. In the past 5 years, Hormozgan province has caught more than 45% of the benthic fish caught off the northern coasts of the Persian Gulf. From Kolahi to Dargahan, one of the most important fishing grounds in this province's southeast is located. Food web models are used to represent a marine system's current state, assess stock levels, and predict change over time. Over a year, the first five dominant fish in the study area, S. tumbil, S. sihama, C. arel, N. japonicus, and T. lepturus, were biometrically measured, and their population dynamics parameters as well as feeding ecology indices were analyzed. According to the trophic-level index results, the five most common species studied in this study belonged to the third (N. Japonicas, S. sihama, and C. arel) and fourth (T. lepturus, and S. tumbil) trophic levels. The key species with the greatest impact on other groups of studied species were identified as S. tumbil and T. lepturus, respectively. The estimated ecosystem indicators were the system operational power (75846.797), the primary production/respiration ratio (0.034), the connectance index (0.159), and the system omnivory index (0.253). A pedigree index (PI) of 0.38 was estimated for the present model. Overexploitation of T. lepturus could disrupt the aquatic food web and adversely affect the long-term sustainable use of aquatic resources, according to data. As a result, ecosystem-based fisheries management should be implemented to find a more appropriate solution to sustainable exploitation in the studied habitat, an important fishing area in the Persian Gulf's north.

show abstract

Section: Sauridasupporting

confidence: 89%

Section: Ta B L Esupporting

confidence: 84%

Trophic structure using ecological relationships between five dominant commercial fish in Kolahi to Dargahan

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The high system overhead value in the SIR, and the results reported for other indicators (TPP/TR; TPP/TB; AC and FCI), suggest that the SIR is an ecosystem in the process of development with an acceptable degree of resilience, similar to other estuarine systems (Senegal,Colléter et al (2012); Nigeria,Abdul and Adekoya (2016); France,Tecchio et al (2015);…”

mentioning

confidence: 53%

“…High AC values can be derived by eutrophication (due to nutrient enrichment), which causes an increase in the total system throughput (Ulanowicz, 1986). Two other tropical systems, Sine-Saloum and Ogun State (Africa), had similar flows as those of temperate and subtropical ecosystems, which could be attributed to their high production of organic matter and lower consumption values (Abdul and Adekoya, 2016). Moreover, the Seine Estuary (temperate) showed a similar flow as that of tropical estuaries.…”

Section: Comparison Of Estuarine Ecopath Modelsmentioning

confidence: 82%

“…Table S6 for model details. Xavier (2013) Caete estuary CAE 220 Brazil 19 Tropical Wolff et al (2000) Sine-Saloum estuary SIN 543 Senegal 37 Tropical Villanueva (2015) Gambia River estuary GAM 654 Senegal 41 Tropical Villanueva (2015) Cameroon estuary CAM 1750 Cameroon 26 Tropical Simon and Raffaelli (2016) Ogun State coastal estuary OGU 26 Nigeria 14 Tropical Abdul and Adekoya (2016) Bamboung Bolong* BOL BOL2 4.7 Senegal 31 Tropical Colléter et al (2012) Río de la Plata estuary RÍO 70500 Uruguay 37 Sub-Tropical Lercari et al (2015) Pearl Selleslagh et al (2012) Somme estuary SOM 50 France 9 Temperate Rybarczyk et al (2003) Seine estuary SEI 188.7 France 15 Temperate Rybarczyk and Elkaïm (2003) St…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Trophic flow structure of a neotropical estuary in northeastern Brazil and the comparison of ecosystem model indicators of estuaries

Lira

Angelini

Loc’h

et al. 2018

Journal of Marine Systems

View full text Add to dashboard Cite

We developed an Ecopath model in the Estuary of Sirinhaém River (SIR), a small-sized system surrounded by mangroves, subject to high impact, mainly by sugar cane industry and other farming industries in order to describe the food web structure and trophic interactions. In addition, we compared our findings with those of 20 available Ecopath estuarine models for tropical, subtropical and temperate regions, aiming to synthesize the knowledge on trophic dynamics and provide a comprehensive analysis of the structures and functioning of estuaries. Our model consisted of 25 compartments and its indicators were within the expected range for estuarine areas around the world. The average trophic transfer efficiency for the entire system was 11.8%, similar to the theoretical value of 10%. The Keystone Index and MTI (Mixed Trophic Impact) analysis indicated that the snook (Centropomus undecimalis and Centropomus parallelus) and jack (Caranx latus and Caranx hippos) are considered as key resources in the system, revealing its high impact in the food web. Both the species have a high ecological and commercial relevance, despite the unregulated fisheries. As result of the comparison of ecosystem model indicators in estuaries, differences in the ecosystem structure from the low latitude zones (tropical estuaries) to the high latitude zones (temperate system) were noticed. The structure of temperate and sub-tropical estuaries were based on high flows of detritus and export, while tropical systems have high biomass, respiration and consumption rates. Higher values of System Omnivory Index (SOI) and Overhead (SO) were observed in the tropical and subtropical estuaries, denoting a more complex food chain. Globally, none of the estuarine models were classified as fully mature ecosystems, although the tropical ecosystems were considered more mature than the subtropical and temperate ecosystems. This study is an important contribution to the trophic modeling of estuaries, Highlights ► Sirinhaém estuary, Northeast Brazil, is an immature and resilient ecosystem. ► The jack and, mainly, snook were key species in the Estuary of Sirinhaém River. ► Tropical estuaries were based in high biomass, respiration and consumption rates. ► The System Overhead Index was higher in tropical estuaries than in the other systems. ► TPP/TR was lower in tropical estuaries than in the other systems.

show abstract

Exploring the ecosystem health of a tropical Indian estuary using mass-balanced ecosystem model

Bhavan

Ingole

Rakshit³

et al. 2022

Aquat Sci

View full text Add to dashboard Cite

Preliminary Ecopath model of a tropical coastal estuarine ecosystem around bight of Benin, Nigeria

Cited by 15 publications

References 51 publications

Trophic structure using ecological relationships between five dominant commercial fish in Kolahi to Dargahan

Trophic structure using ecological relationships between five dominant commercial fish in Kolahi to Dargahan

Trophic flow structure of a neotropical estuary in northeastern Brazil and the comparison of ecosystem model indicators of estuaries

Exploring the ecosystem health of a tropical Indian estuary using mass-balanced ecosystem model

Contact Info

Product

Resources

About