Habitat Fragmentation and Loss

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Habitat Fragmentation and Loss

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Habitat Fragmentation and Loss. Habitat fragmentation = the breaking apart of continuous habitat 1. reduction in the total amount of original habitat (i.e. habitat loss) 2. subdivision of the remaining habitat into fragments, remnants, or patches (i.e. habitat fragmentation) - PowerPoint PPT Presentation

Transcript of Habitat Fragmentation and Loss

Habitat Fragmentation and Degradation

Habitat Fragmentation and Loss

Habitat fragmentation = the breaking apart of continuous habitat1. reduction in the total amount of original habitat (i.e. habitat loss)2. subdivision of the remaining habitat into fragments, remnants, or patches (i.e. habitat fragmentation)3. introduction of new forms of area-use to replace lost habitat

Stages of Landscape Change1. Intact landscapes

2. Variegated landscapes

3. Fragmented

4. Relict landscapesMcIntyre and Hobbs (1999)

Species-Area RelationshipsRelationship between the size of a habitat (or island) and the number of species presentGenerally, for every 10x increase in habitat area you can expect a doubling in species abundance

Theory of Island BiogeographyPreston (1962) and MacArthur & Wilson (1963, 1967)Proposed that the number of species on an island is in a dynamic equilibrium between immigration and extinction

Island Biogeography: Area Effect

Island Biogeography: Distance Effect

Island Biogeography and ConservationAreas of application:How large should preserves be?How does isolation affect species number in reserves?What kinds of species will survive if area is reduced?Fragmentation and its Effects on Community StructureLoss of species richness

Changes in species interactions

Changes to trophic levels

Loss of foundation species

Edge EffectsHigh perimeter length to area ratioGreatest effects occur in small remnant areas and those with complex shapes

Deterministic and Stochastic ProcessesDeterministic = factors that are not necessarily a direct consequence of habitat fragmentation but arise from land uses typically associated with it.

Stochastic (chance) = natural factors related to demographics, genetic variation, environmental fluctuations, catastrophic events

Effects of IsolationImpairs regular movements of organisms

Impairs seasonal/migratory movements

Impairs dispersal movementsMetapopulationsLocal populations interconnected by movements of individuals between them

Salt Marsh Habitat Fragmentation, Degradation and Loss

Problems Facing Salt MarshesAgricultureChannelizationFlood control/LeveesRoadwaysDevelopment

Case Study: Louisiana

http://gallery.usgs.gov/search/Case Study: Louisiana

Seagrass Habitat Fragmentation, Degradation and Loss

Prop Scars!

Coral Reef Habitat Fragmentation, Degradation and Loss

Global annual value of reefs32

Mangrove Habitat Fragmentation, Degradation and Loss

Conservation in Fragmented SeascapesProtect and expand the amount of habitatEnhance the quality of the habitatManage across the entire seascapeIncrease connectivityPlan for the long-termLearn from current and previous efforts


Habitat Fragmentation and its effects on pollinators ...

Habitat Fragmentation and its effects on pollinators ...

Habitat fragmentation and biodiversity conservation: key ...leml.asu.edu/jingle/Wu-Publications-PDFs/2016/Wilson_Etal-2016... · Habitat fragmentation and biodiversity conservation:

Habitat fragmentation and biodiversity conservation: key ...leml.asu.edu/jingle/Wu-Publications-PDFs/2016/Wilson_Etal-2016... · Habitat fragmentation and biodiversity conservation:

Island Biogeography and Habitat Loss...Island Biogeography and Habitat Loss 1. Habitat loss and fragmentation 2. Lessons from islands • Effects of patch area and shape on species

Island Biogeography and Habitat Loss...Island Biogeography and Habitat Loss 1. Habitat loss and fragmentation 2. Lessons from islands • Effects of patch area and shape on species

Changing Climate, Changing Wildlife · Michigan wildlife face myriad conservation challenges, including land use change and habitat loss, habitat fragmentation, competition from invasive

Changing Climate, Changing Wildlife · Michigan wildlife face myriad conservation challenges, including land use change and habitat loss, habitat fragmentation, competition from invasive

Ecosystem Loss and Fragmentation

Ecosystem Loss and Fragmentation

Group Territoriality, Dispersal and Population Persistence in an Endangered Species Endangerment Loss of Required/Preferred Habitat Habitat Fragmentation.

Group Territoriality, Dispersal and Population Persistence in an Endangered Species Endangerment Loss of Required/Preferred Habitat Habitat Fragmentation.

WHAT IS HABITAT FRAGMENTATION? · Habitat fragmentation is an issue of primary concern in conservation biology. However, both the concepts of habitat and fragmentation are ill-defined

WHAT IS HABITAT FRAGMENTATION? · Habitat fragmentation is an issue of primary concern in conservation biology. However, both the concepts of habitat and fragmentation are ill-defined

Review Theory meets reality: How habitat fragmentation ...

Review Theory meets reality: How habitat fragmentation ...

EXERCISE. Effect of fragmentation on orthopteran communities Two main pressures: 1. Habitat loss 2. Abandonment (within-patch forest encroachment)

EXERCISE. Effect of fragmentation on orthopteran communities Two main pressures: 1. Habitat loss 2. Abandonment (within-patch forest encroachment)

Quantifying Terrestrial Habitat Loss and Fragmentation: A

Quantifying Terrestrial Habitat Loss and Fragmentation: A

Habitat Fragmentation - University of Tennesseefwf.ag.utk.edu/mgray/wfs493/Lectures/Students/2015/Cotham.pdf · Habitat fragmentation is the process by which habitat loss results

Habitat Fragmentation - University of Tennesseefwf.ag.utk.edu/mgray/wfs493/Lectures/Students/2015/Cotham.pdf · Habitat fragmentation is the process by which habitat loss results

Habitat Loss, Degradation, and Fragmentation 9 Habitat Loss, Degradation...Habitat Loss, Degradation, and Fragmentation . ... Bolivia (1,098,581) ... prairie lost primarily to ag and

Habitat Loss, Degradation, and Fragmentation 9 Habitat Loss, Degradation...Habitat Loss, Degradation, and Fragmentation . ... Bolivia (1,098,581) ... prairie lost primarily to ag and

Effects of Habitat Fragmentation on - Karen

Effects of Habitat Fragmentation on - Karen

MRE Foundation, Inc. · 2. Protect critical coastal and ocean habitats and biodiversity: a) “Halve the current rate of natural habitat loss and reduce habitat degradation and fragmentation

MRE Foundation, Inc. · 2. Protect critical coastal and ocean habitats and biodiversity: a) “Halve the current rate of natural habitat loss and reduce habitat degradation and fragmentation

Effects of Habitat Fragmentation on Biodiversityweb.pdx.edu/~rueterj/courses/esr220-201001/HabitatFragment2.pdf · distinguish between habitat loss and habitat fragmentation per se,

Effects of Habitat Fragmentation on Biodiversityweb.pdx.edu/~rueterj/courses/esr220-201001/HabitatFragment2.pdf · distinguish between habitat loss and habitat fragmentation per se,

Habitat loss and fragmentation II Bio 415/615. Questions 1. What changes in patch structure occur with habitat fragmentation? 2. How is fragmentation.

Habitat loss and fragmentation II Bio 415/615. Questions 1. What changes in patch structure occur with habitat fragmentation? 2. How is fragmentation.

Habitat Loss & Fragmentation

Habitat Loss & Fragmentation

Habitat fragmentation may not matter to species diversityoferovad/library/Yaacobi_etal_PRSB2007.pdf · Habitat fragmentation may not matter to species diversity Gal Yaacobi1,*, ...

Habitat fragmentation may not matter to species diversityoferovad/library/Yaacobi_etal_PRSB2007.pdf · Habitat fragmentation may not matter to species diversity Gal Yaacobi1,*, ...

I.BIODIVERSITY II. CAUSES OF SPECIES DECLINES A.Habitat loss and Degradation (CH4 is Habitat Destruction and CH5 is Habitat Fragmentation and Landscape.

I.BIODIVERSITY II. CAUSES OF SPECIES DECLINES A.Habitat loss and Degradation (CH4 is Habitat Destruction and CH5 is Habitat Fragmentation and Landscape.

Habitat loss

Habitat loss