کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6369954 1623841 2015 19 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Size change, shape change, and the growth space of a community
ترجمه فارسی عنوان
تغییر اندازه، تغییر شکل و فضای رشد یک جامعه
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم کشاورزی و بیولوژیک (عمومی)
چکیده انگلیسی


- The Living Planet Index measures proportional change in abundance of typical species (“size” change).
- I develop a measure of the extent to which different species' abundances change in different ways (“shape” change).
- I hypothesize that phylogenetically restricted assemblages will show a high proportion of “size” change.

Measures of biodiversity change such as the Living Planet Index describe proportional change in the abundance of a typical species, which can be thought of as change in the size of a community. Here, I discuss the orthogonal concept of change in relative abundances, which I refer to as shape change. To be logically consistent, a measure of the rate of shape change should be scaling invariant (have the same value for all data with the same vector of proportional change over a given time interval), but existing measures do not have this property. I derive a new, scaling invariant measure. I show that this new measure and existing measures of biodiversity change such as the Living Planet Index describe different aspects of dynamics. I show that neither body size nor environmental variability need affect the rate of shape change. I extend the measure to deal with colonizations and extinctions, using the surreal number system. I give examples using data on hoverflies in a garden in Leicester, UK, and the higher plant community of Surtsey. I hypothesize that phylogenetically restricted assemblages will show a higher proportion of size change than diverse communities.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Theoretical Biology - Volume 369, 21 March 2015, Pages 23-41
نویسندگان
,