Results 31 to 40 of about 1,988,646 (98)

Modeling Fish Biomass Structure at Near Pristine Coral Reefs and Degradation by Fishing [PDF]

arXiv, 2008
Until recently, the only examples of inverted biomass pyramids have been in freshwater and marine planktonic communities. In 2002 and 2008 investigators documented inverted biomass pyramids for nearly pristine coral reef ecosystems within the NW Hawaiian islands and the Line Islands, where apex predator abundance comprises up to 85% of the fish biomass.
arxiv  

Population dynamics in the global coral symbiont network under temperature variations [PDF]

arXiv
Coral reefs are crucial to marine biodiversity and rely on a delicate symbiotic relationship between corals and zooxanthellae algae. Water temperature variations, however, disrupt this association, leading to coral bleaching events that severely affect marine ecosystems.
arxiv  

Mathematical modelling and uncertainty quantification for analysis of biphasic coral reef recovery patterns [PDF]

arXiv
Coral reefs are increasingly subjected to major disturbances threatening the health of marine ecosystems. Substantial research underway to develop intervention strategies that assist reefs in recovery from, and resistance to, inevitable future climate and weather extremes.
arxiv  

Hydrodynamics of In-Canopy Flow in Synthetically Generated Coral Reefs Under Oscillatory Wave Motion [PDF]

arXiv
The interaction of oscillatory wave motion with morphologically complex coral reefs showcases a wide range of consequential hydrodynamic responses within the canopy. While a large body of literature has explored the interaction of morphologically simple coral reefs, the in-canopy flow dynamics in complex coral reefs is poorly understood.
arxiv  

Negligible effects of environmental fluctuations on the maintenance of coral biodiversity: A test of five storage effects [PDF]

arXiv
The storage effect is a general explanation for ecological coexistence, wherein different species specialize on different states of a fluctuating environment, e.g., hot vs. cold years. Despite the storage effect's prominence in theoretical ecology, we lack evidence on whether it maintains biodiversity in nature. Here, we examine five storage effects in
arxiv  

From underwater to aerial: a novel multi-scale knowledge distillation approach for coral reef monitoring [PDF]

arXiv
Drone-based remote sensing combined with AI-driven methodologies has shown great potential for accurate mapping and monitoring of coral reef ecosystems. This study presents a novel multi-scale approach to coral reef monitoring, integrating fine-scale underwater imagery with medium-scale aerial imagery. Underwater images are captured using an Autonomous
arxiv  

Multi-label classification for multi-temporal, multi-spatial coral reef condition monitoring using vision foundation model with adapter learning [PDF]

arXiv
Coral reef ecosystems provide essential ecosystem services, but face significant threats from climate change and human activities. Although advances in deep learning have enabled automatic classification of coral reef conditions, conventional deep models struggle to achieve high performance when processing complex underwater ecological images.
arxiv  

Cutting-edge 3D reconstruction solutions for underwater coral reef images: A review and comparison [PDF]

arXiv
Corals serve as the foundational habitat-building organisms within reef ecosystems, constructing extensive structures that extend over vast distances. However, their inherent fragility and vulnerability to various threats render them susceptible to significant damage and destruction.
arxiv  

Hierarchical Classification for Automated Image Annotation of Coral Reef Benthic Structures [PDF]

arXiv
Automated benthic image annotation is crucial to efficiently monitor and protect coral reefs against climate change. Current machine learning approaches fail to capture the hierarchical nature of benthic organisms covering reef substrata, i.e., coral taxonomic levels and health condition.
arxiv  

CORSTITCH - A free, open source software for stitching and georeferencing underwater coral reef videos [PDF]

arXiv
CorStitch is an open-source software developed to automate the creation of accurate georeferenced reef mosaics from video transects obtained through Automated Rapid Reef Assessment System surveys. We utilized a Fourier-based image correlation algorithm to stitch sequential video frames, aligning them with synchronized GNSS timestamps.
arxiv