Nanne van Hoytema

Nanne van Hoytema
Centre for Environment, Fisheries and Aquaculture Science | CEFAS · Division of Monitoring and Programme Management

PhD

About

30
Publications
15,845
Reads
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676
Citations
Citations since 2016
16 Research Items
622 Citations
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140

Publications

Publications (30)
Article
The mismanagement of waste and subsequent presence of litter in the environment is an increasingly significant problem. Globally, rivers have been shown to be a major pathway for mismanaged waste. We investigated the distribution of macro, meso and micro litter along the Belize river basin. The North-East Atlantic OSPAR beach litter monitoring prot...
Article
Full-text available
The increasing abundance of marine litter is impacting the environment, human health and economies in the South Pacific. Small Islands Developing States are particularly affected by marine litter, primarily due to insufficient waste management systems. For the first time, marine litter was quantified and characterised on 13 beaches in Solomon Islan...
Article
Full-text available
Data on the occurrence and abundance of meso and microplastics for the South Pacific are limited and there is urgent need to fill this knowledge gap. The main aim of the study was to apply a rapid screening method, based on the fluorescence tagging of polymers using Nile red, to determine the concentration of meso and microplastics in biota, sedime...
Article
The Wetlands Reserve in Al Wusta Governorate on the Arabian Sea is important for internationally migrating birds and local wildlife, but data on marine litter in the reserve, and wider region, are rare. Seven beaches around the reserve were surveyed for litter in February 2020. Abundance and weight of litter were categorised along 100 m transects....
Article
Plastic waste is of increasing concern in the aquatic environment. A large proportion of plastic waste is generated onshore from where it eventually reaches the marine environment, which is considered the main sink of plastic debris To date there is a substantial lack of knowledge on the composition of these accumulated polymers, their environmenta...
Article
Full-text available
The northern Red Sea experiences strong annual differences in environmental conditions due to its relative high-latitude location for coral reefs. This allows the study of regulatory effects by key environmental parameters (i.e., temperature, inorganic nutrient, and organic matter concentrations) on reef primary production and dinitrogen (N 2) fixa...
Article
Full-text available
Tropical corals are often associated with dinitrogen (N2)-fixing bacteria (diazotrophs), and seasonal changes in key environmental parameters, such as dissolved inorganic nitrogen (DIN) availability and seawater temperature, are known to affect N2 fixation in coral-microbial holobionts. Despite, then, such potential for seasonal and depth-related c...
Article
Full-text available
The tropical seagrass Halophila stipulacea exhibits a limited capacity to use nitrate, but has a high uptake capacity and efficiency for ammonium. Consequently, N2 fixation by associated diazotrophic epiphytes may be important in providing ammonium needed for seagrass photosynthesis and growth. When exposed to sea-sonality, this association could p...
Article
Nitrogen (N) is often a limiting nutrient for primary production in coral reef ecosystems. In this context, dinitrogen (N2) fixing prokaryotes (diazotrophs) associated with benthic primary producers can relieve N limitation. Macroalgae are key reef players that are generally able to rapidly uptake dissolved inorganic nutrients. They may thus partic...
Article
Full-text available
In the article above there is a spelling mistake in the Figure 3 legend. Largge should be Large. The correct Figure 3 legend is shown below:- Figure 3 Biomass values of herbivorous fish functional groups – browsers, grazers and detritivores, and scrapers and small excavators – for each island. Large excavators and bioeroders were not observed, and...
Article
Full-text available
Small-island coral reef ecosystems are usually closely coupled to the activities of human inhabitants. Ahus Island (Papua New Guinea) is an isolated Pacific island with a rapidly growing population, heavy reliance on marine resources and limited infrastructure. We hypothesized that untreated sewage was driving distinct benthic assemblages around Ah...
Article
Full-text available
Biological dinitrogen (N2) fixation (diazotrophy, BNF) relieves marine primary producers of nitrogen (N) limitation in a large part of the world oceans. N concentrations are particularly low in tropical regions where coral reefs are located, and N is therefore a key limiting nutrient for these productive ecosystems. In this context, the importance...
Article
Coral holobionts (i.e., coral-algal-prokaryote symbioses) exhibit dissimilar thermal sensitivities that may determine which coral species will adapt to global warming. Nonetheless, studies simultaneously investigating the effects of warming on all holobiont members are lacking. Here we show that exposure to increased temperature affects key physiol...
Article
Full-text available
Northern Red Sea coral reefs experience pronounced seasonal variations in environmental factors such as water temperature, light intensity, and nutrient availability. This allows studying related effects on primary production by different functional groups. The present study therefore quantified primary production of all dominant benthic primary pr...
Chapter
Full-text available
Bleaching of corals (reversible loss of endosymbiotic zooxanthellae) is an unspecific indicator for a range of environmental stressors including too high or too low water temperatures, sedimentation, high irradiance or turbidity, mechanical disturbance, or infection by microbial pathogens. Coral bleaching may result in the death of affected corals...
Article
Full-text available
Functional traits define species by their ecological role in the ecosystem. Animals themselves are host–microbe ecosystems (holobionts), and the application of ecophysiological approaches can help to understand their functioning. In hard coral holobionts, communities of dinitrogen (N2)-fixing prokaryotes (diazotrophs) may contribute a functional tr...
Article
Full-text available
N2 fixation by coral reef benthic substrates may support primary productivity on oligotrophic coral reefs. However, little is known regarding the influence of environmental parameters on coral reef benthic N2 fixation. This study quantified N2 fixation and photosynthesis in 3 common reef framework substrates: turf algae, coral rock, and the abundan...
Article
Full-text available
Permeable sediments are highly bioactive compartments in coral reefs. The associated dense microbial communities sustain fast degradation of organic matter, thereby playing a key role in nutrient recycling within the reef. Besides nutrient recycling, new nutrients (i.e. nitrogen) are acquired by dinitrogen (N2) fixing microbial communities, but kno...
Article
Full-text available
Dinitrogen (N2) fixation by specialized prokaryotes (diazotrophs) represents an important source of bioavailable nitrogen (N) in the ocean. In coral reefs, several substrates and organisms are associated with diazotrophs, but potential N2 fixation activity by zooxanthellate soft corals has not yet been investigated. Such soft corals may contribute...
Chapter
Bleaching of corals (reversible loss of endosymbiotic zooxanthellae) is an unspecific indicator for a range of environmental stressors including too high or too low water temperatures, sedimentation, high irradiance or turbidity, mechanical disturbance, or infection by microbial pathogens. Coral bleaching may result in the death of affected corals...
Article
Coral reef functioning is based on fixation and cycling of essential C and N. Here, research into these processes is presented from a northern Red Sea coral reef. Water column photosynthetic primary production was relatively low compared to other seas and lowest in the oligotrophic summer. Water column N2 fixation was stable throughout the year and...
Article
Full-text available
Ontogenetic niche shifts are taxonomically and ecologically widespread across the globe. Consequently, identifying the ecological mechanics that promote these shifts at diverse scales is central to an improved understanding of ecosystems generally. We evaluated multiple potential drivers of ontogenetic niche shifts (predation, growth, maturation, d...

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Projects

Projects (2)
Project
Aquire and explore remote sensing and sample data from UK MPAs, develop bespoke monitoring approaches and detect future changes in habitat condition.
Archived project
This research project simultaneously quantified both C- and N-fixation of key reef primary producers, and how these fluxes contributed to overall reef C- and N-fixation. Additionally, the influence of key environmental factors (e.g. light and inorganic nutrient availability, temperature, acidity) on these processes, both on the organism and ecosystem level, were examined.