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Ecological Disturbance

Ecological Disturbance

An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.

Ecological Niches

Ecological Niches

All organisms have a position within an ecosystem. The complete set of living and nonliving factors—including food resources, climate, and terrain—that define the position of a given organism are collectively referred to as the organism’s ecological niche.

Ecological Succession

Ecological Succession

Ecological succession is influenced by the processes of facilitation, inhibition, and toleration. Facilitation occurs when early successional species create more favorable ecological conditions for subsequent species, such as enhanced nutrient, water, or light availability. In contrast, inhibition happens when early successional species create unfavorable ecological conditions for potential successive species, such as limiting resource availability. In some cases, later successional species...

Short-distance Transport of Resources

Short-distance Transport of Resources

Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.

Genome Size and the Evolution of New Genes

Genome Size and the Evolution of New Genes

While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.

Genomics

Genomics

Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...

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Related Experiment Video

Updated: Feb 11, 2026

Collecting Marine Gnathiid Isopod Fish Parasites with Light Traps

Collecting Marine Gnathiid Isopod Fish Parasites with Light Traps

Published on: September 25, 2023

Megx.net--database resources for marine ecological genomics.

Thierry Lombardot¹, Renzo Kottmann, Hauke Pfeffer

¹Microbial Genomics Group, Max Planck Institute for Marine Microbiology, D-28359 Bremen, Germany.

Nucleic Acids Research

|December 31, 2005

Summary

Marine microbial genomics and metagenomics are rapidly growing fields. Megx.net provides integrated databases and tools to link sequence data with environmental context, aiding marine ecosystem research.

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Last Updated: Feb 11, 2026

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Genomic MRI - a Public Resource for Studying Sequence Patterns within Genomic DNA

Genomic MRI - a Public Resource for Studying Sequence Patterns within Genomic DNA

Published on: May 9, 2011

Area of Science:

Environmental microbiology
Marine genomics
Bioinformatics

Background:

Marine microbial genomics and metagenomics are rapidly expanding research areas.
Exponential growth in sequence data necessitates better organization and accessibility.
Linking sequence data with geographical and environmental context is crucial for understanding marine ecosystems.

Purpose of the Study:

To introduce Megx.net, a novel set of databases and tools for managing marine genomic and metagenomic data.
To integrate sequence data with environmental context for enhanced analysis.
To facilitate a deeper understanding of marine ecosystem functions.

Main Methods:

Development of a geographic information system for storing and analyzing marine genomic and metagenomic data with contextual information.
Implementation of an environmental genome browser for rapid data searching.
Creation of databases for precomputed genomic analyses and metagenomic fragment classification using oligonucleotide signatures.

Main Results:

Megx.net offers a centralized platform for accessing and interpreting marine genomic and metagenomic data.
The system integrates diverse data types, including sequence, geographic, physical, chemical, and biological information.
Tools for data classification and analysis are provided, enhancing research capabilities.

Conclusions:

Megx.net provides an essential resource for researchers studying marine microbial communities.
The integrative approach aids in addressing complex questions about organismal adaptation and nutrient cycling.
Freely accessible online resources promote broader scientific engagement and discovery in marine science.