Vocab Quiz 6 Flashcards
Allee effect
The increase of probability of extinction when the population is so small that population density itself matters.
DNA Barcoding
taxonomic method using a short genetic marker of DNA to identify the species it belongs to.
Catch per unit effort - CPUE
An estimate of how much fishing is done to acquire a given catch
Fishing down the food web
The process where having depleted the large predatory fish on top of the food web, you then turn to increasingly smaller species, finally ending up with previously spurned small fish and invertebrates
Habitat degradation
A process where the natural habitat is reduced and functionally unable to support the species present
Habitat fragmentation
process by which habitat loss results in the division of large, continuous habitats into a greater number of smaller patches of lower total area, isolated from each other by a matrix of dissimilar habitats
Latitude diversity gradient
The general case where diversity increases from high to low latitude
Maximum sustainable yield
In fisheries biology, the maximum catch obtainable per unit time under the appropriate fishing rate
Molecular clocks
The dating of a biological event (e.g, origin of an evolutionary group) by using the rate at which DNA sequences change over time
Marine Protected Area - MPAs
A conservation geographic unit designed to protect crucial communities and to provide reproductive reserves for fisheries that hopefully will disperse over wider areas
Otoliths
A small mass of calcium carbonate, used in the inner ear of a fish for perception of balance. The mass often grows in increments that can allow us to determine the age of the fish
Phylogeography
The study that combines geographic and evolutionary aspects of the distribution of species
Shifting baselines
The concept that our perception of the natural environment may change according to how the environment changes over the generations, resulting in a misperception of what was natural several generations before human degradation
Year Class
Fish of a given species that were all spawned in the same year or at the same time
