Community Ecology I. Introduction II. Multispecies Interactions with a Trophic Level III. Multispecies Interactions across Trophic Levels IV. Succession.

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Presentation transcript:

Community Ecology I. Introduction II. Multispecies Interactions with a Trophic Level III. Multispecies Interactions across Trophic Levels IV. Succession V. Biodiversity: Patterns and Processes A.The Species-Area Relationship 1. The pattern 2. The Theory of Island Biogeography 3. Why is this important? Fragmentation 4. The SLOSS debate

- The SLOSS Debate - So, to preserve biodiversity (and the ecosystem services it provides to humanity), conservationists began to consider the best strategy for maximizing the preservation of diversity...should we preserve several small areas, or a single large one?

Large > Small Minimize Edge Clumped Corridors Wilson and Willis (1975) - Why is this important? - Conserving Diversity: the SLOSS debate

Number of Species Area in Square Meters - Why is this important? - Conserving Diversity: the SLOSS debate Simberloff and Gotelli (1983)

BUT! Can we maintain all the species if they live on different islands? ABCDEFGHABCDEFGH AB C D E F G H All species preserved while accommodating the species area effect!

- BUT! Can we maintain all the species if they live on different islands? - Probably not, because communities are NESTED. ABCDEFGHABCDEFGH AB C D E F G H

- BUT! Can we maintain all the species if they live on different islands? - Probably not, because communities are NESTED. Nested Subset Structure: Species on species- poor islands are also found on species-rich islands. ABCDEFGHABCDEFGH AB C D E F G H

- BUT! Can we maintain all the species if they live on different islands? - Probably not, because communities are NESTED. Nested Subset Structure: Species on species- poor islands are also found on specie-rich islands. ABCDEFGHABCDEFGH AB C D E F G H NOT NESTED AA A B A B C A NESTED

Community Ecology I. Introduction II. Multispecies Interactions with a Trophic Level III. Multispecies Interactions across Trophic Levels IV. Succession V. Biodiversity: Patterns and Processes A.The Species-Area Relationship 1. The pattern 2. The Theory of Island Biogeography 3. Why is this important? Fragmentation 4. The SLOSS debate 5. Nestedness

NESTED-SUBSET STRUCTURE: (Darlington 1957, Patterson and Atmar 1986) - Why is this important? - Conserving Diversity: the SLOSS debate - "Nestedness" (Darlington (1957); Patterson and Atmar (1986) Communities are ‘nested’ if the species in depauperate assemblages are also found in progressively more species rich communities Communities are ‘nested’ if the species in depauperate assemblages are also found in progressively more species rich communities A B C D E A A B C A B C D

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z26 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z26 A B C D E F G H I J K L M N O P Q R S T U V W X 24 A B C D E F G H I J K L M N O P Q R S T U V W X 24 A B C D E F G H I J K L M N O + Q R S T U V W X23 A B C D E F G H I J K L M N O + Q R S T U V W X23 A B C D E F G H I J K L M N O P Q R S T U +21 A B C D E F G H I J K L M N O P Q R S T U +21 A B C D E F G H I J K L M + O P Q R S T +19 A B C D E F G H I J K L M + O P Q R S T +19 A B C D E + G H I J K + + N O P +13 A B C D E + G H I J K + + N O P +13 A B C D E + G + I J K + + N O + Q + V 14 A B C D E + G + I J K + + N O + Q + V 14 A B C D E + + H I J K L + N O A B C D E + + H I J K L + N O A B C D E F G H + +K L + + O P +11 A B C D E F G H + +K L + + O P +11 A B C D E F G + I J K A B C D E F G + I J K A B C D E F G H I J A B C D E F G H I J A B C D E F G M + R 9 A B C D E F G M + R 9 A B C D E F + H + + L + + P 9 A B C D E F + H + + L + + P 9 A B C + E + I J + N 7 A B C + E + I J + N 7 A B C D E F I + 7 A B C D E F I + 7 A B C D E F + M 7 A B C D E F + M 7 A B C D E + G + M 7 A B C D E + G + M 7 A B C D E F H + 7 A B C D E F H + 7 A B C D E F + 6 A B C D E F + 6 A B C D + F L 6 A B C D + F L 6 A B C D E + 5 A B C D E + 5 A B C + + F L 5 A B C + + F L 5 A B + D E 4 A B + D E 4 A B + F 3 A B + F 3 A B + 2 A B + 2 C 1 C 1 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z26 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z26 A B C D E F G H I J K L M N O P Q R S T U V W X 24 A B C D E F G H I J K L M N O P Q R S T U V W X 24 A B C D E F G H I J K L M N O + Q R S T U V W X23 A B C D E F G H I J K L M N O + Q R S T U V W X23 A B C D E F G H I J K L M N O P Q R S T U +21 A B C D E F G H I J K L M N O P Q R S T U +21 A B C D E F G H I J K L M + O P Q R S T +19 A B C D E F G H I J K L M + O P Q R S T +19 A B C D E + G H I J K + + N O P +13 A B C D E + G H I J K + + N O P +13 A B C D E + G + I J K + + N O + Q + V 14 A B C D E + G + I J K + + N O + Q + V 14 A B C D E + + H I J K L + N O A B C D E + + H I J K L + N O A B C D E F G H + +K L + + O P +11 A B C D E F G H + +K L + + O P +11 A B C D E F G + I J K A B C D E F G + I J K A B C D E F G H I J A B C D E F G H I J A B C D E F G M + R 9 A B C D E F G M + R 9 A B C D E F + H + + L + + P 9 A B C D E F + H + + L + + P 9 A B C + E + I J + N 7 A B C + E + I J + N 7 A B C D E F I + 7 A B C D E F I + 7 A B C D E F + M 7 A B C D E F + M 7 A B C D E + G + M 7 A B C D E + G + M 7 A B C D E F H + 7 A B C D E F H + 7 A B C D E F + 6 A B C D E F + 6 A B C D + F L 6 A B C D + F L 6 A B C D E + 5 A B C D E + 5 A B C + + F L 5 A B C + + F L 5 A B + D E 4 A B + D E 4 A B + F 3 A B + F 3 A B + 2 A B + 2 C 1 C 1 NESTEDNESS (Patterson and Atmar 1986)

Goby Gudgeon Catfish Hardyhead Perch NESTEDNESS AND NICHE SPACE (Kodric-Brown and Brown 1993)

Goby Gudgeon Catfish Hardyhead Perch

- Why is this important? - Conserving Diversity: the SLOSS debate - "Nestedness" (Darlington (1957); Patterson and Atmar (1986) - Fragmentation causes decreased diversity - non-random loss of predators - subsequent declines – keystone effects

- Why is this important? - Conserving Diversity: the SLOSS debate - "Nestedness" (Darlington (1957); Patterson and Atmar (1986) - Fragmentation causes decreased diversity - increased stress decreases diversity non-randomly

Summary: Causes of nestedness - nested niche space - differences in dispersal capabilities -differences in extinction probabilities As these are the same factors that cause the species-area relationship, itself, we should not be surprized that communities distributed across habitats of different size are often nested, too.