Emotional vs Practical Management

Grey Whales, Wolves

Political Process: management by committee, public input

Fig. 19-3; MFC Statement; Bay Game

Renewable resource management: Fisheries, Game, Timber

terrestrial market hunting no longer a factor, trapping reduced

hunter-gatherer still in marine environment, some aquaculture

Tragedy of the commons: Garrett Hardin 1968 Science 162: 1243

Science 284: 278- Common Pool Resources

1) preservation of breeding stock, control of harvest:

closed seasons, bag limits, size limits,

maximum sustained yield Fig. 18.4; Gulf Menhaden

catch per unit effort: technology improvements: skipjacks & oysters

Biotic potential important in defining management strategies

Fig. 18.3a ≥r≤; Fig. 18.3b ≥K≤

Other criteria: ecological role of managed population:

mullet, salmon

Fishing down the food chain: top predators harvested from sea.

2) predator control beneficial in some cases,

1) expensive and ineffectual

2) competition with hunters generally unimportant

3) most predators now seen as beneficial to game management (fig 19-2)

3) habitat preservation/improvement

Preserves: hunted land

Refuges: protected areas

Habitat preservation may be the most important factor

Increasing food resources

Frequently combined with agricultural practices

fence rows, potholes, erodable areas

more under design of preserves

Marine reserves: Dry Tortugas

4) game stocking/farming

augmentation and introduction: introduced ≥farm raised≤ species rarely survive

trout/ducks/turkeys

put and take

Pest control

what is a pest? Starlings

r selected, respond to disturbance

K selected, outcompete natives

Chemical control: wipe out non-target and predator species as well

Resistance

Biological Control:

Bacillus thuringensus: Bt spray and genetic

Lots of horror stories; cane toads, mongoose

Intyegrated pest management: Fig 18.13