{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Heat heat primary producers m35 bio 3115 universit

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: oducers M3.5 BIO 3115 Université d’Ottawa / University of Ottawa Natural rarity - specialized requirements Some species are naturally rare because they have very specialized habitat requirements. If the required habitat is rare, then so too will be the species in question. E.g. Kirtland’s Warbler requires 10-15 yr old Jack Pine forests for breeding. M3.6 BIO 3115 Université d’Ottawa / University of Ottawa M3 2009-2010.3 BIO 3115 Conservation Biology Natural rarity: specialized requirements, competition Some species are naturally rare because while they can survive outside of particular habitats, they are generally excluded due to interactions with other species (e.g. competition) E.g. McDonald’s rock-cress can only persist on serpentine rock outcrops with high levels of soil magnesium. But it is at a severe competitive disadvantage on normal soils. M3.7 BIO 3115 Université d’Ottawa / University of Ottawa Natural rarity: patchy availability of suitable habitat and limited dispersal Some species are naturally rare because habitable areas are beyond the dispersal range of the species; this is particularly a problem for island endemics. E.g. corral reef fish; coral reefs have more species than tropical forests, but are limited (only 0.2% of the oceans’ surface!); 93% have been damaged and 510% destroyed. M3.8 BIO 3115 Université d’Ottawa / University of Ottawa M3 2009-2010.4 BIO 3115 Conservation Biology Natural rarity; low genetic variability Some species are naturally rare because low genetic variability prevents them from adapting to changing environmental conditions E.g. Furbish’s Lousewort An endemic to Maine, found only in four isolated populations; Lives in unstable habitat patches along riverbanks, and is a poor competitor. Thus, probability of local extinction is very high even at best locations. M3.9 BIO 3115 Université d’Ottawa / University of Ottawa Proportion of species Rarity, population abundance and species richness Within a given area, the proportion of species (in a given taxon) having a population abundance x is often well-approximated by the log-normal distribution f(x) As overall richness increases, the proportion of species with low abundance increases, and average abundance decreases. Higher richness P...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern