Brachyuran crab community structure and associated sediment reworking activities in pioneer and young mangroves of French Guiana, South America

Aschenbroich, Adélaïde; Michaud, Emma; Stieglitz, Thomas; Fromard, François; Gautier, Antoine; Tavares, Marcos; Thouzeau, Gérard

doi:10.1016/j.ecss.2016.09.003

Cited by 28 publications

(23 citation statements)

References 67 publications

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“…high spectral resolution and broad spectral coverage to enable addressing a large variety of topics and questions, such as deriving water depth, water properties and benthic habitat by optimization [9,10,20], coral reef monitoring [20], or biofilm characterization [8,21]; -high spatial resolution (<10 cm) to study structures with complex geometry, such as coral reefs [20], or small features, such as the holes of mangrove crabs [22].…”

Section: Introductionmentioning

confidence: 99%

Direct Georeferencing of a Pushbroom, Lightweight Hyperspectral System for Mini-UAV Applications

et al. 2018

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Abstract:Hyperspectral imagery has proven its potential in many research applications, especially in the field of environmental sciences. Currently, hyperspectral imaging is generally performed by satellite or aircraft platforms, but mini-UAV (Unmanned Aerial Vehicle) platforms (<20 kg) are now emerging. On such platforms, payload restrictions are critical, so sensors must be selected according to stringent specifications. This article presents the integration of a light pushbroom hyperspectral sensor onboard a multirotor UAV, which we have called Hyper-DRELIO (Hyperspectral DRone for Environmental and LIttoral Observations). This article depicts the system design: the UAV platform, the imaging module, the navigation module, and the interfacing between the different elements. Pushbroom sensors offer a better combination of spatial and spectral resolution than full-frame cameras. Nevertheless, data georectification has to be performed line by line, the quality of direct georeferencing being limited by mechanical stability, good timing accuracy, and the resolution and accuracy of the proprioceptive sensors. A georegistration procedure is proposed for geometrical pre-processing of hyperspectral data. The specifications of Hyper-DRELIO surveys are described through two examples of surveys above coastal or inland waters, with different flight altitudes. This system can collect hyperspectral data in VNIR (Visible and Near InfraRed) domain above small study sites (up to about 4 ha) with both high spatial resolution (<10 cm) and high spectral resolution (1.85 nm) and with georectification accuracy on the order of 1 to 2 m.

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Section: Introductionmentioning

confidence: 99%

Direct Georeferencing of a Pushbroom, Lightweight Hyperspectral System for Mini-UAV Applications

et al. 2018

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“…Thus, additional bare sediment areas, pioneer mangroves, and young mangroves could not (1) Denotes taxa in functional groups that are significantly correlated with bioturbation rates. Significant correlations are denoted by asterisks: * P \ 0.05; ** P \ 0.01; *** P \ 0.001 be reached and replicated, as also found by Aschenbroich et al (2016) in 2014 in the same Guianese study area. Sampling was thus only done during the spring tide, because a minimum water height (2.8 m) was required to access the targeted sites.…”

Section: Spatial Limitationsmentioning

confidence: 97%

“…In mangroves, studies evaluating the importance of bioturbation have focused on the activities of megafauna (i.e., crabs; Kristensen, 2008;Aschenbroich et al, 2016;Chen et al, 2016). However, in temperate wetlands, the bioturbation activities by small benthic invertebrates (Oligochaetes) also enhance the production of nitrogen necessary for the growth of temperate macrophytes (Mermillod-Blondin & Lemoine, 2010).…”

Section: Introductionmentioning

confidence: 99%

Bioturbation functional roles associated with mangrove development in French Guiana, South America

et al. 2017

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 17613 Any correspondence concerning this service should be sent to the repository administrator: staff-oatao@listes-diff.inp-toulouse.fr Abstract This study aims to qualify, quantify, and compare the sediment reworking rates induced by the meso-(0.25-1 mm) and macro-infauna ([1 mm) along a mangrove growth gradient in the sedimentary dynamics of the French Guiana coast. The characterization of the role of small-infauna bioturbation in mangroves is new despite their known numerical dominance in tropical environments. Bare sediment, pioneer mangroves, and young mangroves were investigated during the dry season and spring tide to characterize their environment, infaunal functional community structure and sediment reworking rates. The biodiffusion differed significantly between mangrove stages, co-varying mainly with density and functional richness. On the contrary, the non-local transport remained similar, despite the mangrove-agespecificity of infauna functional compositions, which responded to modifications in the nature and content of organic matter. The first mangrove infaunal functional sequence is described: organisms that first colonize deposited mud generate the maximum biodiffusive mixing and induce a total downward particle flux (BDF) as high as in the young mangroves; in the pioneer mangroves, the infauna variables and BDF are stressed to minimum values. Our study sheds light on the functional contribution of the small infauna in a mangrove coastal area and quantifies its role in particle transport during mangrove development.

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“…These densities, means, basal area, and standing biomass provided an indication of mangrove forest structure and the health of mangrove stands. The non-parametric Kruskal-Wallis test (data did not follow normal distribution) was used to test if there were any significant differences in mangrove height and DBH between sites in conservation and general use zones [57,58]. Height and DBH readings for sites in conservation and general use zones were compared using the Mann-Whitney test to evaluate any differences in forest structure between these locations, since they were all a part of Turneffe Atoll [57].…”

Section: Statistical Analysesmentioning

confidence: 99%

The Relationship between Resilient Mangroves and Fish Populations in the Largest Marine Reserve in Belize: A Case for Conservation

Osborne

Cho-Ricketts

Salazar

2019

Preprint

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Mangrove forests are one of the most bio-diverse and productive wetland environments on earth.However, these unique tropical forest environments that occupy coastal areas are among the most threatened habitats globally. Approximately one-third of the world's mangrove forests in tropical and subtropical coastlines have been lost to logging, conversion of land for agriculture and mariculture, and degradation due to general pollution over the past 50 years. The large population of mangroves occupying the Turneffe Atoll area in Belize face growing anthropogenic threats such as permanent clearing of land for housing and infrastructural development as well as pollution and natural factors (climate change). Despite these threats, mangroves have high resilience due to their fast rates of microbial decomposition and nutrient flux, large storage of nutrients below-ground, numerous feedbacks, keystone species redundancy and self-design, and highly efficient biotic controls. Given the few formal studies done to evaluate mangrove resilience at Turneffe Atoll, the purpose of this study was to evaluate mangrove resilience and nursery functions in the Turneffe Atoll Marine Reserve. Mangrove fish abundance, forest structure, and prop root length was assessed by means of visual census and point centred quarter method (PCQM) for 11 sites that span across conservation and general use zones. This study found that resilient mangroves (lower vulnerability ranks, higher standing biomass, and higher fish biomass and abundance) exist in conservation and general use zones and warrant the need for improved mangrove conservation measures. Some conservation measures include: greater reduction of non-climate stressors, establishment of more mangrove conservation areas, and implementation of more outreach and educational programmes.

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Brachyuran crab community structure and associated sediment reworking activities in pioneer and young mangroves of French Guiana, South America

Cited by 28 publications

References 67 publications

Direct Georeferencing of a Pushbroom, Lightweight Hyperspectral System for Mini-UAV Applications

Direct Georeferencing of a Pushbroom, Lightweight Hyperspectral System for Mini-UAV Applications

Bioturbation functional roles associated with mangrove development in French Guiana, South America

The Relationship between Resilient Mangroves and Fish Populations in the Largest Marine Reserve in Belize: A Case for Conservation

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