Metapopulation extinction thresholds in rain forest remnants
Although habitat fragmentation is a major threat to global biodiversity, the demographic mechanisms underlying species loss from tropical forest remnants remain largely unexplored. In particular, no studies at the landscape scale have quantified fragmentation's impacts on colonization, extinction, a...
| Autor principal: | Zartman, Charles Eugene |
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| Outros Autores: | Shaw, A. Jonathan |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
American Naturalist
2020
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https://repositorio.inpa.gov.br/handle/1/18779 |
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oai:repositorio:1-18779 |
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oai:repositorio:1-18779 Metapopulation extinction thresholds in rain forest remnants Zartman, Charles Eugene Shaw, A. Jonathan Bryophyte Extinction Risk Fragmentation Metapopulation Population Dynamics Population Growth Relative Abundance Growth, Development And Aging Moss Physiology Population Growth Reproduction Species Extinction Tropic Climate Bryophyta Extinction, Biological Population Growth Reproduction Tropical Climate Bryophyta Bryophytes Although habitat fragmentation is a major threat to global biodiversity, the demographic mechanisms underlying species loss from tropical forest remnants remain largely unexplored. In particular, no studies at the landscape scale have quantified fragmentation's impacts on colonization, extinction, and local population growth simultaneously. In central Amazonia, we conducted a multiyear demographic census of 292 populations of two leaf-inhabiting (i.e., epiphyllous) bryophyte species transplanted from continuous forest into a network of 10 study sites ranging from 1, 10, and 100 to >10,000 ha in size. All populations experienced significantly positive local growth (λ > 1) and a nearly constant per-generational extinction probability (15%). However, experimental leaf patches in reserves of ≥ 100 ha experienced nearly double (48%) the colonization probability observed in small reserves (27%), suggesting that the proximate cause of epiphyll species loss in small fragments (≤10 ha) is reduced colonization. Nonetheless, populations of small fragments exhibit rates of colonization above patch extinction, positive local growth, and low temporal variation, which are features that should theoretically reduce the probability of extinction. This result suggests that for habitat-tracking metapopulations subject to frequent and stochastic turnover events, including epiphylls, colonization/extinction ratios must be maintained well above unity to ensure metapopulation persistence. © 2006 by The University of Chicago. All rights reserved. 2020-06-15T22:02:59Z 2020-06-15T22:02:59Z 2006 Artigo https://repositorio.inpa.gov.br/handle/1/18779 10.1086/499376 en Volume 167, Número 2, Pags. 177-189 Restrito American Naturalist |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Bryophyte Extinction Risk Fragmentation Metapopulation Population Dynamics Population Growth Relative Abundance Growth, Development And Aging Moss Physiology Population Growth Reproduction Species Extinction Tropic Climate Bryophyta Extinction, Biological Population Growth Reproduction Tropical Climate Bryophyta Bryophytes |
| spellingShingle |
Bryophyte Extinction Risk Fragmentation Metapopulation Population Dynamics Population Growth Relative Abundance Growth, Development And Aging Moss Physiology Population Growth Reproduction Species Extinction Tropic Climate Bryophyta Extinction, Biological Population Growth Reproduction Tropical Climate Bryophyta Bryophytes Zartman, Charles Eugene Metapopulation extinction thresholds in rain forest remnants |
| topic_facet |
Bryophyte Extinction Risk Fragmentation Metapopulation Population Dynamics Population Growth Relative Abundance Growth, Development And Aging Moss Physiology Population Growth Reproduction Species Extinction Tropic Climate Bryophyta Extinction, Biological Population Growth Reproduction Tropical Climate Bryophyta Bryophytes |
| description |
Although habitat fragmentation is a major threat to global biodiversity, the demographic mechanisms underlying species loss from tropical forest remnants remain largely unexplored. In particular, no studies at the landscape scale have quantified fragmentation's impacts on colonization, extinction, and local population growth simultaneously. In central Amazonia, we conducted a multiyear demographic census of 292 populations of two leaf-inhabiting (i.e., epiphyllous) bryophyte species transplanted from continuous forest into a network of 10 study sites ranging from 1, 10, and 100 to >10,000 ha in size. All populations experienced significantly positive local growth (λ > 1) and a nearly constant per-generational extinction probability (15%). However, experimental leaf patches in reserves of ≥ 100 ha experienced nearly double (48%) the colonization probability observed in small reserves (27%), suggesting that the proximate cause of epiphyll species loss in small fragments (≤10 ha) is reduced colonization. Nonetheless, populations of small fragments exhibit rates of colonization above patch extinction, positive local growth, and low temporal variation, which are features that should theoretically reduce the probability of extinction. This result suggests that for habitat-tracking metapopulations subject to frequent and stochastic turnover events, including epiphylls, colonization/extinction ratios must be maintained well above unity to ensure metapopulation persistence. © 2006 by The University of Chicago. All rights reserved. |
| format |
Artigo |
| author |
Zartman, Charles Eugene |
| author2 |
Shaw, A. Jonathan |
| author2Str |
Shaw, A. Jonathan |
| title |
Metapopulation extinction thresholds in rain forest remnants |
| title_short |
Metapopulation extinction thresholds in rain forest remnants |
| title_full |
Metapopulation extinction thresholds in rain forest remnants |
| title_fullStr |
Metapopulation extinction thresholds in rain forest remnants |
| title_full_unstemmed |
Metapopulation extinction thresholds in rain forest remnants |
| title_sort |
metapopulation extinction thresholds in rain forest remnants |
| publisher |
American Naturalist |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/18779 |
| _version_ |
1787143564629639168 |
| score |
11.653393 |