Presentation is loading. Please wait.

Presentation is loading. Please wait.

The diet of the Eurasian badger (Meles meles) in the Republic of Ireland Gráinne Cleary, Nicola Marples, Leigh Corner & James OKeefe.

Similar presentations


Presentation on theme: "The diet of the Eurasian badger (Meles meles) in the Republic of Ireland Gráinne Cleary, Nicola Marples, Leigh Corner & James OKeefe."— Presentation transcript:

1 The diet of the Eurasian badger (Meles meles) in the Republic of Ireland Gráinne Cleary, Nicola Marples, Leigh Corner & James OKeefe

2 Why this is new First Republic of Ireland sample Results will help with BCG vaccine program Large sample size based on stomachs Badgers in Ireland have narrow niche breadths

3 Dietary Niche Breadth BS = (B-1) / (n-1) Specialist Generalist 0 1

4 Section 1 The diet during each season is examined followed by the dietary niche breadth Spring Summer Autumn Winter

5 Section 2 Feeding trails on captive badgers to estimate - passage rate - assimilation efficiency Results help to understand foraging strategy which may be related to dietary niche breadth Section 3 Summary of results

6 Section 1 What do badgers eat?

7 Spring

8 Dietary niche breadth = 0.23 Specialist Generalist 0 1

9 Summer

10 Dietary niche breadth = 0.40 Specialist Generalist 0 1

11 Autumn

12 Dietary niche breadth = 0.26 Specialist Generalist 0 1

13 Winter

14 Dietary niche breadth = 0.44 Specialist Generalist 0 1

15 To sum up… Seasonally, the diet is dominated by a couple of food items and therefore the badgers have a narrow niche breadth Spring Tipulid Larvae BS = 0.23 Summer Frogs BS = 0.40 Bees & Wasps Autumn Noctuid LarvaeBS = 0.26 Winter Noctuid LarvaeBS = 0.44 Frogs

16 Section 2 Feeding trails

17 Why does the badger have such a narrow dietary niche breadth?

18 Food items passed rapidly through the gastrointestinal tract –After 7 hours only one badgers stomach still had traces of food –After 16 hours the colon only had traces of selected food items Results showed that…

19 Stomach and faecal samples suggest that during periods of prey abundance badgers gorge. Therefore food passes rapidly through the gut resulting in low assimilation efficiency and food wastage. Combined with results from dietary analysis…

20 Other mustelids also have low assimilation efficiency Mink (Mustela vision) – Errington (1967) North American Badger (Taxidea taxus) – Harlow (1981) Weasel (Mustela nivalis) – Moors (1977) Wolverine (Gulo gulo) – Farrell and Wood (1968) Sea Otters (Enhydra lutris) – Iversen (1972)

21 Why does the badger have such a narrow dietary niche breadth? Species with low absorption efficiency may eat fewer food items = narrow niche breadth Species with high absorption efficiency eat more prey types = broader niche breadth

22 Section 3 To Sum Up, We tentatively suggest that…

23 Due to low assimilation efficiency badgers have a narrow dietary niche breadth composed of high-quality foods

24 Low ingested biomass of earthworms compared to UK This could be due to insect larvae having a higher engery content

25 Huge intake of v egetation may be involved in slowing down passage time through the gut? Could this result in higher assimilation efficiency?

26 Acknowledgements Mr. Bill Coleman Dept of Agriculture & Food Dr. Ursula Fogarty Staff at IEC Staff at Abbotstown farm Ms. Alison Boyce Mr. Peter Stafford Ms. Lynsey Stuart Lynsey Stuart


Download ppt "The diet of the Eurasian badger (Meles meles) in the Republic of Ireland Gráinne Cleary, Nicola Marples, Leigh Corner & James OKeefe."

Similar presentations


Ads by Google