Your Federal Quarterly Tax Payments are due April 15th Get Help Now >>

Match a Patch by gyvwpsjkko

VIEWS: 7 PAGES: 16

									     Match a Patch




Yolanda

Pretorius        University of KwaZulu Natal
                 STUDY AIM:
To identify the main mechanisms behind small
  scale forage selection by large herbivores



     Patch
    Selection
         Water   Fire     Topography       Geology   Wind




                 Soil Nutrient Heterogeneity
∆ Time




                           ∆ Space
?
      Fertilization Experiment Plot Design
NPK             2m x 2m   10m x 10m       50mx50m



0.6         6g/m²         1.2g/m²     X
kg/50x50m
3           30g/m²        6g/m²       1.2g/m²
kg/50x50m

15          X             30g/m²      6g/m²
kg/50x50m
                  Dung Counts




- Old marked
  dung
- Fresh
  unmarked dung
- Fresh marked
  dung
                        Herbivore Response to Fertilization

                                                                                                   Fertilizer Presence
                                                                                                          Absent
                40.00                                                                                     Present


                                                                                                   Dot/Lines show Sums
Dung Presence




                30.00




                20.00




                10.00




                 0.00

                        Steenbok      Impala        Kudu       Zebra        Giraffe     Elephant
                               Duiker       Warthog    Waterbuck     Buffalo    White Rhino

                                                     Species
                      1. Body Size




Jarman-Bell Principle: Larger ungulates can tolerate a wider range in
       diet quality (digestibility) than smaller ungulates can
1.1 Body Size – Patch Scale Hypothesis




                               10




                               8
     Standardized Dung Count




                                                    0.014
                               6




                               4                             Body Size

                                                                Small
                               2
                                                                Medium

                               0                                Large
                                    2x2m   10x10m   50x50m
1.2 Body Size – Patch [Nutrient] Hypothesis




                                      10


                                           0.002
                                                     0.034
            Standardized Dung Count




                                       8




                                       6

                                                                        0.019
                                       4                              Body Size

                                                                         Small
                                       2
                                                                         Medium

                                       0                                 Large
                                           1.2g/m2   6g/m2   30g/m2
1.3 Body Size – Patch Heterogeneity Hypothesis




                                       10

                                            0.008                     0.017
                                       8
             Standardized Dung Count




                                       6

                                                                                   0.005
                                       4                                           Body Size

                                                                                      Small
                                       2
                                                                                      Medium

                                       0                                              Large
                                            0.6ton/plot   3ton/plot   15ton/plot
                 2. GIT Type
Retention Time                  Digestibility




                  Monogastric




                    Ruminant
2.1 GIT Type – Patch Scale Hypothesis




                                10




                                8
      Standardized Dung Count




                                6




                                4


                                                              GIT
                                2
                                                                Monogastric

                                0                               Ruminant
                                     2x2m   10x10m   50x50m
2.2 GIT Type – Patch [Nutrient] Hypothesis




                               10



                                    0.039
                               8
     Standardized Dung Count




                               6




                               4


                                                               GIT
                               2
                                                                 Monogastric

                               0                                 Ruminant
                                    1.2g/m2   6g/m2   30g/m2
3. Mouth Size &        4. Herd/Solitaire
Manoeuvrability




            5. Grazer/Browser
Thank You

								
To top