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Litter size and latitude in a large mammal: the wild boar Sus scrofa

Bywater, Kirsten A. and Apollonio, Marco and Cappai, Nadia and Stephens, Philip A. (2010) Litter size and latitude in a large mammal: the wild boar Sus scrofa. Mammal Review, Vol. 40 (3), p. 212-220. eISSN 1365-2907. Article.

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DOI: 10.1111/j.1365-2907.2010.00160.x


1. A positive relationship between clutch size or litter size and latitude exists in birds and many species of small mammal. Hitherto, however, analyses for large mammals have failed to provide evidence that litter sizes increase with latitude.
2. We collated data from published studies of wild boar in Europe, to analyse the relationship between litter size and latitude in this widely distributed terrestrial mammal.
3. Depending on the specific data set (whether only the most reliable data or all available data were included), latitude explained 58% to 72% of the variation in mean litter sizes across studies. On average, litter size increases by approximately 0.15 piglets per degree of latitude.
4. A strong correlation between litter size and latitude for wild boar in Europe provides a starting point for demographic modelling of this species of both ecological and economic importance.
5. The pattern for wild boar is consistent with Ashmole’s explanation for the effects of latitude on reproduction. The contrast between our results and those generated for other large mammals may result from our focus on an herbivore in contrast to previous work which was focused on carnivores. Further work could usefully examine the extent of seasonality in the availability of resources for species of different dietary types.

Item Type:Article
ID Code:5505
Uncontrolled Keywords:Demographic modelling, diet, life history, reproduction, seasonality
Subjects:Area 05 - Scienze biologiche > BIO/05 Zoologia
Divisions:001 Università di Sassari > 01 Dipartimenti > Zoologia e genetica evoluzionistica
Publisher:Blackwell / Wiley
Copyright Holders:© 2010 The Authors, Journal compilation © 2010 Mammal Society, Mammal Review
Deposited On:14 Feb 2011 10:29

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