Non-predatory mortality of planktonic microcrustaceans (Cladocera and Copepoda) in neotropical semiarid reservoirs

Diniz, Leidiane Pereira; França, Elton José de; Bonecker, Cláudia Cósta; Marcolin, Catarina da Rocha; Júnior, Mauro de Meló

doi:10.1590/0001-3765202120190991

Cited by 3 publications

(1 citation statement)

References 57 publications

(32 reference statements)

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“…Non‐predatory factors are related to an estimated 25%–33% of marine copepod mortality (Hirst & Kiørboe, 2002). Ignoring this type of mortality can lead researchers to incorrect interpretations of the population dynamics of these groups (Diniz et al, 2021; Silva et al, 2020; Tang & Elliott, 2014). The causes of non‐predatory mortality can be highly variable, and the most common are senescence, feeding, physicochemical stress and even marine pollution (Pavlova & Melnikova, 2006a, 2006b, 2011; Tang et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Zooplankton community and copepod carcasses and non‐predatory mortality in six tropical estuarine systems (Northeast of Brazil)

da Cruz,

Lira,

de Melo Júnior

2023

Marine Ecology

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Copepod carcasses and non‐predatory mortality can occur due to natural senescence, disease, pollution, and physicochemical stress. Our objective is to evaluate and characterize the rates of non‐predatory mortality and the contribution of zooplankton community carcasses, represented by the copepods, in tropical estuarine ecosystems with different degrees of urbanization. During the study, there was a significant difference between environments and copepod carcasses, with Suape Bay (moderately urbanized) being the environment with the highest abundance of adult copepod carcasses (93.3%). The average non‐predatory mortality rate of adult copepods was 0.15 day−1: Santa Cruz Channel (sparsely urbanized) contributed the lowest values, with a mortality rate of 0.01 day−1, and Suape (moderately urbanized) had the highest rate (2.80 day−1). The families Paracalanidae (0.554 day−1) and Oithonidae (0.122 day−1) had the highest values, with an average carcass decomposition of 4.7 days. Among the environments studied, there was little differentiation between carcass percentages and mortality rate, not supporting the hypothesis that the higher rates of mortality among non‐predatory copepods were related to large urban centers. However, there was an almost proportional contribution of carcasses and non‐predatory mortality in all but a few areas, agreeing with the hypothesis that there is spatial variation with respect to carcasses in tropical estuaries. With our work, we show that estuaries can provide the estuarine food web with a significant portion of copepod carcasses, which may vary by family, and that it is not necessarily environments with a higher degree of urbanization that will have higher mortality rates.

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Section: Introductionmentioning

confidence: 99%

Zooplankton community and copepod carcasses and non‐predatory mortality in six tropical estuarine systems (Northeast of Brazil)

da Cruz,

Lira,

de Melo Júnior

2023

Marine Ecology

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Degradation of dead cladoceran zooplankton and their contribution to organic carbon cycling in stratified lakes: field observation and model prediction

Толомеев

Dubovskaya

Kirillin

et al. 2022

Journal of Plankton Research

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The contribution of dead zooplankton biomass to carbon cycle in aquatic ecosystems is practically unknown. Using abundance data of zooplankton in water column and dead zooplankton in sediment traps in Lake Stechlin, an ecological-mathematical model was developed to simulate the abundance and sinking of zooplankton carcasses and predict the related release of labile organic matter (LOM) into the water column. We found species-specific differences in mortality rate of the dominant zooplankton: Daphnia cucullata, Bosmina coregoni and Diaphanosoma brachyurum (0.008, 0.129 and 0.020 day−1, respectively) and differences in their carcass sinking velocities in metalimnion (and hypolimnion): 2.1 (7.64), 14.0 (19.5) and 1.1 (5.9) m day−1, respectively. Our model simulating formation and degradation processes of dead zooplankton predicted a bimodal distribution of the released LOM: epilimnic and metalimnic peaks of comparable intensity, ca. 1 mg DW m−3 day−1. Maximum degradation of carcasses up to ca. 1.7 mg DW m−3 day−1 occurred in the density gradient zone of metalimnion. LOM released from zooplankton carcasses into the surrounding water may stimulate microbial activity and facilitate microbial degradation of more refractory organic matter; therefore, dead zooplankton are expected to be an integral part of water column carbon source/sink dynamics in stratified lakes.

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Temporal Variation and Spatial Distribution in the Water Environment Helps Explain Seasonal Dynamics of Zooplankton in River-Type Reservoir

Yin

Xia

et al. 2022

Sustainability

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Integrated assessment of the water environment has become widespread in many rivers, lakes, and reservoirs; however, aquatic organisms in freshwater are often overlooked in this process. Zooplankton, as primary consumers, are sensitive and responsive to changes in the water environment. Water and zooplankton samples were collected on-site at Shanxi Reservoir quarterly to determine 12 water environmental indicators and to quantify the abundance of zooplankton of Cladocera, Copepoda and Rotifera by using the ZooScan zooplankton image-scanning analysis system, combined with OLYMPUS BX51 using machine learning recognition classification. The aim was to explore the relationship between water environmental factors and zooplankton through their spatial and temporal heterogeneity. Through principal component analysis, redundancy analysis and cluster analysis, variations in the factors driving zooplankton population growth in different seasons could be identified. At the same time, different taxa of zooplankton can form clusters with related water environmental factors during the abundant water period in summer and the dry water period in winter. Based on long-term monitoring, zooplankton can be used as a comprehensive indicator for water environment and water ecological health evaluation, as well as providing scientific support for regional water resources deployment and management.

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Non-predatory mortality of planktonic microcrustaceans (Cladocera and Copepoda) in neotropical semiarid reservoirs

Cited by 3 publications

References 57 publications

Zooplankton community and copepod carcasses and non‐predatory mortality in six tropical estuarine systems (Northeast of Brazil)

Zooplankton community and copepod carcasses and non‐predatory mortality in six tropical estuarine systems (Northeast of Brazil)

Degradation of dead cladoceran zooplankton and their contribution to organic carbon cycling in stratified lakes: field observation and model prediction

Temporal Variation and Spatial Distribution in the Water Environment Helps Explain Seasonal Dynamics of Zooplankton in River-Type Reservoir

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