http://en.wikipedia.org/wiki/Killer_whale#Mammal_prey

The rules state “In all cases, the other player will always have an opportunity to react to the change (one turn), before examining whether species cards need to be discarded because of loss of compatible linkage.”

However, “Food Chain Disruption” reads:
PLAY: on SPECIES card of FOREST TERRAIN. This card has an immediate effect.
EFFECT: The affected SPECIES card is discarded. Also discard played SPECIES that are incompatible.

This specifies that it has an immediate effect. Does this mean Species that are incompatible as a result of the discarding of the affected Species would be discarded immediately, without the other player having a chance to react? If not, why would anyone ever choose to use this card when they could use Wildfire instead (which would have precisely the same effect, but also be usable on Grassland terrain)?

I assume that this is, indeed, an immediate effect and that this happens before the opponent’s turn.

Compare this to “Habitat Loss”:
PLAY: on 1 SPECIES card on any land based TERRAIN.
EFFECT: Convert to URBAN terrain permanently. Discard played SPECIES that are incompatible.

This doesn’t mention that it’s an immediate effect. However, it does say that in the effect you are to discard played Species that are incompatible. Does this also happen before the opponent can react to it?
If the opponent does get to react to it, this is unnecessary text. Wildfire does not need to mention that Species that are made incompatible as a result will be discarded unless the opponent moves them or provides alternate links, so neither should Habitat Loss and similar cards.

(In addition, there are two Wildfire cards, one only usable on Plantae and the other usable on any Species that are Grassland or Forest terrain.)

Thanks!