What environmental factors affect marine nematode abundance?5 answersEnvironmental factors influencing marine nematode abundance include sediment granulometry, inundation period, food availability (such as phytopigments), dissolved oxygen concentration, pH, nitrate levels, suspending material, reactive silicate, water temperature, salinity, and sediment factors like phaeophorbide, chlorophyll a, and mean grain size. These factors play crucial roles in shaping nematode communities in marine ecosystems. For instance, disturbances like sediment erosion and bait harvesting can alter nematode genus richness and feeding guilds, favoring certain taxa over others. Additionally, hypoxic conditions impact nematode populations, with changes in community composition and feeding types observed under different oxygen levels, highlighting the importance of dissolved oxygen in driving shifts in nematode communities.
How the water fluorescence influence Copepoda abundance?5 answersWater fluorescence can influence the abundance of Copepoda. The fluorescence technique has been criticized for possible degradation of chlorophyll during passage through copepod guts and changes in gut passage time with food concentration. However, fluorescence microscopy using specific excitation and emission wavelengths has been found to be a reliable means of visualizing and differentiating salmon lice from non-target copepods. Environmental factors such as phytoplankton density, salinity, total suspended solids (TSS), and dissolved oxygen (DO) significantly influence the abundance of epibenthic copepod groups. Additionally, the fluorescence signal emitted by chlorophyll-a molecules can be used to identify phytoplankton abundance in inland waters, providing valuable ecological indications about water quality. The presence of highly pigmented copepod species, such as those in the Boeckella genus, may allow them to survive brightly lighted environments, contributing to their abundance in certain habitats.
What factors influence the abundance of phytoplankton in marine ecosystems?4 answersFactors influencing the abundance of phytoplankton in marine ecosystems include environmental variables such as water temperature, dissolved inorganic nitrogen (DIN), heavy metals, nutrients, and light availability.These factors can vary seasonally and spatially, impacting the composition and biomass of phytoplankton communities.In coastal ecosystems, water temperature and DIN were found to be key factors controlling the seasonal variability of phytoplankton communities.In the Global Ocean, Southern Ocean, and Arctic Ocean, phytoplankton biomass and composition were influenced by factors such as nitrate concentration, photosynthetically available radiation (PAR), and sea surface temperature.In tropical estuaries, environmental conditions including temperature, salinity, dissolved oxygen (DO), and dissolved organic matter (DOM) were found to be important in explaining the variation in zooplankton abundance.Additionally, river plumes can carry high nutrient loads and influence phytoplankton distribution along the plume gradient.Overall, the abundance of phytoplankton in marine ecosystems is influenced by a combination of physical, chemical, and biological factors that vary across different regions and seasons.
What determines the abundance of copepods in the sea?4 answersThe abundance of copepods in the sea is determined by various factors. Temperature and salinity are important physical factors that strongly influence the taxonomic diversity and distribution of copepod populations. Food availability also plays a crucial role in controlling copepod growth, with phytoplankton blooms being important regulators of copepod abundance. Copepods have the potential to influence the surrounding microbial communities through nutrient release and sloppy feeding, shaping bacterial community composition and distribution in seawater. Environmental variability, such as depth and distance from the shore, can also affect copepod populations, with copepod abundance and biomass showing seasonal changes. The distribution and abundance of calanoid copepods, a dominant group of copepods, are influenced by sea surface temperature and variation in species composition and abundance. Overall, the abundance of copepods in the sea is influenced by a combination of physical factors, food availability, microbial interactions, and environmental variability.
What are the factors that affect the abundance of fish in an area?5 answersThe factors that affect the abundance of fish in an area include weather and climate dynamics, temperature, rainfall, ocean acidification, dissolved oxygen, salinity, sea temperature, salinity flux, landscape structure and land use, topography, morphology, hydrology, physical and chemical water characteristics, hormonally active substances, pesticides, food availability, fisheries, and piscivorous birds. These factors have been found to have significant correlations with fish population variability and fisheries activities. Additionally, the distribution of fish communities is associated with topographic characteristics, landscape configuration, land-use type, hydrology, and morphology. Climate change also plays a role in affecting fish abundance through its impact on wild fisheries, aquaculture, and supply chain processes such as storage, transport, processing, and retail. Overall, a multitude of factors, including environmental parameters and human activities, influence the abundance of fish in an area.
What physical factors affect human health?5 answersPhysical factors that affect human health include the built environment, cosmogeophysical disturbances, and lifestyle choices. The built environment, including factors such as air quality, water quality, and access to green spaces, can have both positive and negative impacts on human health. Cosmogeophysical disturbances, such as changes in weather patterns and photoperiodic variations, can also influence human health, particularly in high-latitude regions. Additionally, lifestyle choices, such as diet, physical activity, and exposure to environmental hazards, play a significant role in determining overall health. These factors interact with each other and can have both direct and indirect effects on human health. Understanding and addressing these physical factors is crucial for promoting and maintaining good health in individuals and communities.