Occurrence of species-rich crab fauna in a human-impacted mangrove forest questions the application of community analysis as an environmental assessment tool

Geist, Simon Joscha; Nordhaus, Inga; Hinrichs, Saskia

doi:10.1016/j.ecss.2011.10.002

Cited by 37 publications

(31 citation statements)

References 53 publications

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“…Logged mangrove areas in the SAL, which were then overgrown by Derris, still provide an important food source for Episesarma spp., as highest densities of Episesarma spp. were recorded directly among the Derris stands (Geist et al 2012). Under these circumstances, deforestation of Rhizophora apiculata might not have an effect on leaf-feeders as previously assumed, presuming that other crab species would also consume Derris willingly.…”

Section: Consumption Ratesmentioning

confidence: 91%

“…Sediment input through these rivers, mainly due to deforestation in the hinterland, continues to reduce the water volume of the lagoon (Ardli 2007). Dominant benthic crabs in the intertidal region are from the genera Episesarma, Ilyoplax, Perisesarma, Macrophthalmus, Metaplax, Uca (Geist et al 2012) and Scylla (Sastranegara et al 2003). In the eastern lagoon, dominant tree species are Aegiceras corniculatum, Nypa fructicans and Rhizophora apiculata, the latter 2 being indicators for a mature forest.…”

Section: Study Sitementioning

confidence: 99%

“…The most abundant crab species in the Segara Anakan Lagoon (SAL) in Java, Indonesia, belong to the families Sesarmidae (Perisesarma darwinense, P. longicristatum, P. semperi, Episesarma singaporense, E. versicolor, E. palawense), Grapsidae (Metopograpsus latifrons) and Varunidae (Metaplax elegans) (Geist et al 2012). The main carbon sources of the genera Episesarma and Persisesarma in the SAL are detritus, mangrove leaves and bark (Nordhaus et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Experimental determination of stable carbon and nitrogen isotope fractionation between mangrove leaves and crabs

Herbon¹,

Nordhaus²

2013

Mar. Ecol. Prog. Ser.

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The analysis of benthic food webs in mangrove forests is complicated by the lack of experimental investigations of consumer-diet discrimination factors (Δ 15 N and Δ 13 C) for most mangrove invertebrates. This study aimed to determine the fractionation of δ Leaves of D. trifoliata and R. apiculata were preferentially consumed, indicating their higher nutritive value. We concluded that (1) the discrimination values for mangrove crabs feeding on a leaf diet are much higher than previously assumed, which can most likely be explained by the selective assimilation of isotopic heavy carbon compounds and by metabolic cycling of non-essential amino acids; (2) the frequently used average discrimination factors are inappropriate for the study of benthic food webs in mangrove forests with a high biomass of leaf-eating crabs; and (3) E. singaporense and E. versicolor can meet their nitrogen demand by assimilating nitrogen from R. apiculata leaves and by using internal reserves for at least 50 d.

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Section: Consumption Ratesmentioning

confidence: 91%

Section: Study Sitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental determination of stable carbon and nitrogen isotope fractionation between mangrove leaves and crabs

Herbon¹,

Nordhaus²

2013

Mar. Ecol. Prog. Ser.

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“…The mangrove swamp connects to the Lagos lagoon by tidal creek [12]. The Crab species (Plates 1 and 2) were collected at the mangrove part of the Lagos Lagoon along University of Lagos using the removal method [5]. They were caught between 7 pm and 11 pm.…”

Section: Methodsmentioning

confidence: 99%

“…The crab fisheries are also predominant in the marine, coastal, freshwater and lagoon fishery [4]. According to Geist et al, [5] crabs are known as ecosystem engineers due to their ability to burrow into sediment structures. These enhance sediment aeration and improve the biodiversity of surrounding vegetation associated to the mangrove environment.…”

Section: Introductionmentioning

confidence: 99%

Size and Growth of Cardiosoma armatum and Cardiosoma guanhumi as Ecological Parameters for Mangrove Ecosystem

Olalekan¹,

Ao²,

Pr³

2015

J Marine Sci Res Dev

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Assessing the conservation status of mangroves in Rakhine, Myanmar

Lee,

Nicholson,

Duncan

et al. 2023

Aquatic Conservation

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Ecosystem degradation is a key challenge that human society faces, as ecosystems provide services that are tied to human well‐being. Particularly, mangrove ecosystems provide important services to communities but are suffering heavy degradation, loss and potential collapse due to anthropogenic activities. The IUCN Red List of Ecosystems is a transparent and consistent framework for assessing ecosystems' risk of collapse and is increasingly used to inform legislation and ecosystem management globally. Satellite data have become increasingly common in environmental monitoring due to their extensive spatial and temporal coverage. Here, recent advances in analyses using satellite‐derived data were implemented to reassess the conservation status of the ‘Rakhine mangrove forest on mud’, an important intertidal ecosystem in Myanmar, extending a previous national Red List assessment that assessed the ecosystem as Critically Endangered. By incorporating additional data sources and analyses, the extended assessment produced more robust results and reduced the uncertainty in the previous assessment. Overall, the ecosystem was assessed as Critically Endangered (range: Vulnerable to Critically Endangered) as a result of historical mangrove extent loss. Recent losses and biotic disruptions were also observed, which would have led to the ecosystem being assessed as Vulnerable. While the final outcome of the Red List assessment remained at Critically Endangered due to the historical state of the mangroves pre‐dating the temporal coverage from satellite data, the uncertainty of the ecosystem's status was reduced, and the reassessment highlighted the recent areal changes and mangrove degradation that has occurred. The importance of conducting reassessments when new data become available is discussed, and a template for future mangrove Red List assessments that use satellite data as their primary source of information to improve the robustness of their results is presented.

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Occurrence of species-rich crab fauna in a human-impacted mangrove forest questions the application of community analysis as an environmental assessment tool

Cited by 37 publications

References 53 publications

Experimental determination of stable carbon and nitrogen isotope fractionation between mangrove leaves and crabs

Experimental determination of stable carbon and nitrogen isotope fractionation between mangrove leaves and crabs

Size and Growth of Cardiosoma armatum and Cardiosoma guanhumi as Ecological Parameters for Mangrove Ecosystem

Assessing the conservation status of mangroves in Rakhine, Myanmar

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