Biomass determination based on the individual volume of the dominant copepod species in the Western Egyptian Mediterranean Coast

Zakaria, Howaida Y.; Hassan, Abdel-Kader M.; El‐Naggar, Hussein A.; Abo-Senna, Fekry M.

doi:10.1016/j.ejar.2018.05.002

Cited by 11 publications

(9 citation statements)

References 19 publications

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“…They stated that the high abundance of copepods in Lake Timsah occurred under conditions of elevated salinity, whereas lower salinity allowed rotifers and other freshwater forms to flourish near the outlet of a canal carrying urban waste. This dominance of copepods was documented previously in the same area (Abou-Zeid 1990;Ghobashy et al 1992), in the Suez Canal area (El-Serehy et al, 2001) and in the eastern Mediterranean (Dowidar, 1988;Zakaria et al, 2018b). Rotifers are known to be excellent indicators of organic pollution as they thrive better in organically rich environments (Paleolog et al, 1997).…”

Section: Discussionsupporting

confidence: 74%

Zooplankton groups in Lake Timsah, Suez Canal, Egypt

El-Damhougy¹,

El‐Naggar²,

Aly-Eldeen³

et al. 2019

Egypt. J. of Aquatic Biolo. and Fish.

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To shed some light on distribution, abundance and diversity of zooplankton groups in Lake Timsah, four cruises (spring 2015, summer 2015, autumn 2015, and winter 2016) were carried out. In the present result, Lake Timsah zooplankton were comprised 13 groups of the animal kingdom include, Copepoda (with relative abundance of 39.44%); Rotifera (32.72%); Mollusca (15.15%); Tintinnida (4.55%); Polychaeta (3.43%); Cirripedia (1.62%); Decapoda (1.24%); Cladocera (0.94%); Ostracoda (0.57%); Appendicularia (0.19%); Fish egg (0.06%); Foramenifera (0.04%) and Cnidaria (0.04%). Copepoda was found to be the most diversified group during the study period, it represented by 62 species comprised 44.93% of the total recorded species, followed by Rotifera (33 species, 23.91%), Tintinnida (18 species, 13.04%), Cladocera (10 species, 7.25%), Ostracoda (5 species, 3.62%), Mollusca (4 species, 2.90%), Appendicularia (3 species, 2.17%), Cnidaria (2 species, 1.45%) and only one species of Foramenifera represented 0.72% of the total recorded zooplankton species. Seasonally, zooplankton was flourished in summer, while winter is the lowest abundant season. Spatially, because of the difference of water masses entering the lake, each group is dominant in a certain region. Copepods are common in sites that near of Suez Canal due to the presence of saline water masses. While, rotifers and other freshwater zooplanktons are dominant in sites that near freshwater masses, such as western lagoon.

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Section: Discussionsupporting

confidence: 74%

Zooplankton groups in Lake Timsah, Suez Canal, Egypt

El-Damhougy¹,

El‐Naggar²,

Aly-Eldeen³

et al. 2019

Egypt. J. of Aquatic Biolo. and Fish.

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“…Copepod carbon biomass was calculated from (i) the median of the minimum and maximum weights for the CV and CVI copepodite stages; and (ii) the regression equations relating wet weight and dry weight (mg) to carbon (mg C, Wiebe, 1988). The minimum and maximum weights were estimated from the range values of copepodite length reviewed by Conway (2006) for the North Atlantic sector and species-specific lengthweight relationships (Durbin and Durbin, 1978;Cohen and Lough, 1981;Williams and Robins, 1982;Dam and Peterson, 1991;Zakaria et al, 2018). The list of the copepod species identified in this study, the final carbon conversion factor values and their corresponding frequencies (%) and average biomasses (µgC L −1 ), are shown in Supplementary Table 1.…”

Section: Datasetsmentioning

confidence: 99%

Seasonal Variations in the Biodiversity, Ecological Strategy, and Specialization of Diatoms and Copepods in a Coastal System With Phaeocystis Blooms: The Key Role of Trait Trade-Offs

et al. 2021

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Although eutrophication induced by anthropogenic nutrient enrichment is a driver of shifts in community composition and eventually a threat to marine biodiversity, the causes and consequences on ecosystem functioning remain greatly unknown. In this study, by applying a trait-based approach and measuring niche breadth of diatoms and copepods, the drivers and underlying mechanisms of the seasonal species succession of these ecological communities in a coastal system dominated in spring by Phaeocystis blooms were explored. It is suggested that the seasonal succession of diatoms and copepods is the result of several trade-offs among functional traits that are controlled by the seasonal abiotic and biotic pressure encountered by the plankton communities. The results of this study highlight that a trade-off between competition and predator, i.e., weak competitors are better protected against predation, plays an important role in promoting plankton species richness and triggers the Phaeocystis bloom. As often observed in eutrophicated ecosystems, only the biotic homogenization of the copepod community and the shift in the diet of copepods toward Phaeocystis detrital materials have been detected during the Phaeocystis bloom. The diatom and copepod communities respond synchronously to fluctuating resources and biotic conditions by successively selecting species with specific traits. This study confirms the key role of competition and predation in controlling annual plankton succession.

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“…In this respect, the quantitative and qualitative investigation of zooplankton organisms in any aquatic environment is essential regarding the knowledge about the productivity and diversity in that specific environment (El-Damhougy et al, 2019). The study of zooplankton is essential for the evaluation of ecosystem conditions, even though their passive transportation does not permit the formation of clearly defined units, as is possible for benthic system (Ibrahim et al, 2017;Zakaria et al, 2018a). Therefore, study of the distribution of these organisms is also useful for the general monitoring of certain aspects of the environment, such as hydrographic events, eutrophication, pollution, warming trends and long-term changes which are signs of environmental disturbance .…”

Section: Introductionmentioning

confidence: 99%