The ecology of extinction

• Autorzy: Simberloff D
• Języki publikacji: EN

Abstrakty

EN

Studies of species-area curves and of the spatial correlation of biogeographic ranges with climatic variables may allow some crude prediction of amount of extinction over large regions in the face of major environmental change. However, these approaches tell little about the proximate causes of species loss. The contention that failure of metapopulation dynamics is at the root of many species extinctions is so far not borne out by observed rates of inter-population movement. Rather, most species that have a metapopulation structure seem to have central source populations and peripheral sink populations. Much of the extinction recorded in the ecological literature is probably of such peripheral populations and their loss has little to do with species extinctions. The disappearance of central, source populations is more important but its causes are not well documented. Habitat loss is the single greatest ultimate cause of current extinction. However, disappearance of the very last individuals of the last population of a species may not be obviously related to habitat loss. Rather, it may seem mysterious, because the last individuals will look healthy, or it may seem attributable to one of the stochastic forces widely assumed to set minimum viable population sizes.

PL

Powiązanie wiedzy o areałach zajmowanych przez poszczególne gatunki ze zmiennością klimatu może pozwolić na przybliżone przewidywanie intensywności wymierania na dużych obszarach w wyniku wielkich przemian środowiska. Podejście takie niewiele jednak pomaga w ustaleniu ostatecznej przyczyny wymierania. Większość gatunków ma swoje centralne populacje źródłowe i peryferyczne populacje zanikowe. Większość zapisanych w materiale paleontologicznym przykładów wymierania odnosi się do populacji peryferycznych. Ich koniec niewiele ma wspólnego z rzeczywistym wymieraniem gatunku. O wiele istotniejszy jest zanik populacji centralnych, ale przyczyny tego zjawiska nie są dostatecznie udokumentowane. W czasach nam współczesnych zanik środowiska właściwego dla gatunku jest najpoważniejszym czynnikiem wymierania. Śmierć ostatnich osobników ostatniej populacji nie musi być jednak w oczywisty spoób związana ze zmianami w środowisku. Najczęściej jest skutkiem działania nieidentyfikowalnych, zapewne przypadkowych czynników.

Słowa kluczowe

PL

zmiany klimatyczne; wymieranie gatunkow; populacje centralne; populacje zrodlowe; skamienialosci; wymieranie populacji; paleontologia; populacje zanikowe

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 1993
• Tom: 38
• Numer: 3-4
• Opis fizyczny: s.159-174,bibliogr.

Twórcy

autor

Simberloff D

• Florida State University, Tallahassee, Frorida 32306, USA

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