RNA/DNA ratio of crabs as an indicator of mangrove habitat quality

Amaral, Valter; Penha‐Lopes, Gil; Paula, José

doi:10.1002/aqc.1039

Cited by 17 publications

(8 citation statements)

References 46 publications

(60 reference statements)

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“…Nucleic acid M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 3 derived indices of growth and condition have been used in recent decades in several marine organisms such as fish, bivalves, cephalopods and crustaceans (e.g. Gorokhova and Kyle, 2002;Sykes et al, 2004;Chícharo and Chícharo, 2008;Amaral et al, 2009). More specifically, it has been developed to assess copepod physiological conditions (Chícharo and Chícharo, 2008), as an indicator of nutritional condition (Wagner et al, 1998;Vehmaa et al, 2012), growth (Elser et al, 2000;Wagner et al, 2001), dormant condition (Kobari et al, 2013) and egg viability (Hogfors et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

RNA:DNA ratios as a proxy of egg production rates of Acartia

Cruz

Teodósio

Ben-Hamadou

et al. 2017

Estuarine, Coastal and Shelf Science

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Estimates of copepod secondary production are of great importance to infer the global organic matter fluxes in aquatic ecosystems and species-specific responses of zooplankton to hydrologic variability. However, there is still no routine method to determine copepods secondary production in order to eliminate time consuming experimental analyses. Therefore, we determined whether there is a correlation between Egg Production Rates (EPR) and RNA:DNA ratios of Acartia, by measuring their seasonal and spatial variability and the influence of environmental factors for Acartia sp. collected in the the Guadiana river estuary. EPR of A. tonsa was positively related with chlorophyll a concentration, freshwater inflow and biomass of dinoflagellates, while A. clausi was only related to dinoflagellates. Dinoflagellates seem to be the optimal food item influencing the reproduction of both Acartia species in the studied area. The biochemical index RNA:DNA was positively related to EPR, indicating that it is a good proxy of copepod production and a promising method to use in the future to estimate secondary production.

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Section: Introductionmentioning

confidence: 99%

RNA:DNA ratios as a proxy of egg production rates of Acartia

Cruz

Teodósio

Ben-Hamadou

et al. 2017

Estuarine, Coastal and Shelf Science

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“…To our knowledge, this study corresponds to the first in-situ ecotoxicological assessment of the effects of regular and controlled urban WW discharges on crab physiology in a natural mangrove. This new approach using a caging experimental protocol in a natural mangrove forest is complementary to previous studies that focused on artificial mesocosms Penha-Lopes et al, 2012, 2009a or to in-situ studies using sampled crabs in polluted mangroves (Amaral et al, 2009;Penha-Lopes et al, 2009b). As already discussed in Capdeville (2018), the response of the crab community and the individual physiological response may be linked to WW discharge but also to the induced environmental modifications.…”

Section: Discussionmentioning

confidence: 79%

Wastewater bioremediation by mangrove ecosystems impacts crab ecophysiology: In-situ caging experiment

Theuerkauff

Rivera‐Ingraham

Lambert³

et al. 2020

Aquatic Toxicology

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Mangroves are tidal wetlands that are often under strong anthropogenic pressures, despite the numerous ecosystem services they provide. Pollution from urban runoffs is one such threats, yet some mangroves are used as a bioremediation tool for wastewater (WW) treatment. This practice can impact mangrove crabs, which are key engineer species of the ecosystem. Using an experimental area with controlled WW releases, this study aimed to determine from an ecological and ecotoxicological perspective, the effects of WW on the red mangrove crab Neosarmatium africanum. Burrow density and salinity levels (used as a proxy of WW dispersion) were recorded, and a 3-week caging experiment was performed. Hemolymph osmolality, gill Na+/K+-ATPase (NKA) activity and gill redox balance were assessed in anterior and posterior gills of N. africanum. Burrow density decreased according to salinity decreases around the discharged area. Crabs from the impacted area had a lower osmoregulatory capacity despite gill NKA activity remaining undisturbed. The decrease of the superoxide dismutase activity indicates changes in redox metabolism. However, both catalase activity and oxidative damage remained unchanged in both areas but were higher in posterior gills. These results indicate that WW release may induce osmoregulatory and redox imbalances, potentially explaining the decrease in crab density. Based on these results we conclude that WW release should be carefully monitored as crabs are key players involved in the bioremediation process. Highlights ► Mangroves are suggested as biofiltering systems of domestic effluent. ► Mangrove crabs are involved through their bioturbation activities. ► Wastewater release impacts crab burrow density. ► Mangrove crabs are physiologically impacted by wastewaters.

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“…These multiple potential synergies and trade‐offs are under‐researched at present in mangroves, as indeed in many other ecosystems. Information relating to ecological changes stemming from domestic pollution indicates potentially significant interactions between services in mangroves (Amaral et al ., ).…”

Section: Discussionmentioning

confidence: 97%

The benefits of fringing mangrove systems to Mumbai

Everard

Jha

Russell³

2014

Aquatic Conservation

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1. Mumbai's mangroves have been significantly depleted through historical city development and continuing encroachment. These mangroves are important for production of a range of ecosystem services.2. Recent conservation-oriented orders in India's courts of justice recognize some of the values associated with mangroves, though wider benefits flow to diverse stakeholders through many additional ecosystem services provided by Mumbai's remaining fringe of mangrove systems.3. Valuation of ecosystem services on a semi-quantitative basis and, where possible, using value-transfer techniques from other relevant studies, demonstrates in indicative terms the magnitude of the benefits provided to Mumbai by its mangrove systems and connected habitats. Values could only be deduced approximately as most services lie outside the current market.4. Conservative valuation and assumptions about cumulative, non-quantified value emphasize the importance of mangroves to the built environment, people, and future security of Mumbai. This reinforces the need for conservation and restoration of the mangrove resource, particularly as a matter of 'natural insurance' in the light of a changing climate, sea-level rise and other emerging sustainability challenges. 5. Current mangrove extent is at its most sparse on the seaward border of the city, arguably where greatest protection is required from storms, tsunamis, and other threats.6. Investment in mangrove restoration would add significant value to the city region. Novel economic tools such as 'payments for ecosystem services' (PES) may be used to protect or enhance the mangrove stands of Mumbai.

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RNA/DNA ratio of crabs as an indicator of mangrove habitat quality

Cited by 17 publications

References 46 publications

RNA:DNA ratios as a proxy of egg production rates of Acartia

RNA:DNA ratios as a proxy of egg production rates of Acartia

Wastewater bioremediation by mangrove ecosystems impacts crab ecophysiology: In-situ caging experiment

The benefits of fringing mangrove systems to Mumbai

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