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Isotope analysis reveals dietary overlap among sympatric canids
Abstract When colonizing new regions, invading species might compete strongly with phylogenetically related species native to the regions they are colonizing, eventually leading to coexistence or displacement. In the southeast of the United States, recently established coyotes (Canis latrans) compete with red fox (Vulpes vulpes) and gray fox (Urocyon cinereoargenteus), although it remains unclear if competition is leading to resource partitioning or displacement by species. Using nitrogen and carbon stable isotopes, we tested the hypothesis that coyotes compete with foxes for food resources, with canids partitioning those resources to mitigate competition. We compared diets of canids in the southeast to those in the Plains region of the United States, a region where all three species historically have coexisted. We analyzed 217 hair samples from both regions pre-1960, prior to coyote colonization of the southeast, and post-2000, after coyotes were ubiquitous there, to assess differences in diet among species for both regions (southeast versus Plains and time periods, pre- versus postcolonization by coyotes). Modeling revealed significant dietary overlap among historical and contemporary populations in the southeast. Historically, all species partitioned resources in the Plains. Contemporarily, red fox and coyotes co-occurring in the Plains overlapped in diet; however, gray fox diet did not overlap with those of red fox and coyotes. Absence of partitioning in diet among co-occurring canids in the southeast indicates that interspecific competition could be strong in the region. Competition among canid populations in the southeast could lead to further resource partitioning among species that promotes coexistence or competitive exclusion of smaller fox species where coyote populations are abundant.
Journal Article
Amazing arctic animals
Describes the physical characteristics, adaptations, and behavior of various animals that live in the arctic, including the polar bear, arctic fox, and arctic hare.
Book
Flight directions of songbirds are unaffected by the topography of Lake Erie’s southern coastline during fall migration
Not provided.
Journal Article
Crocodile encounters : and more true stories of adventures with animals
Follow along with National Geographic explorer Brady Barr as he crawls into a muddy hole just barely big enough for his shoulders, and comes face to face with thirteen crocodiles! Laugh out loud as you learn how to catch a crocodile using shoe laces and underpants. Read in anticipation to find out what happens when you put a 600-lb crocodile on an airplane in just a flimsy wooden crate. These action-packed stories and more will engage readers and inspire them to go out and explore their own world.
Book
