کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4372334 1617088 2016 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Newly proposed node segregation index is not suitable for analyzing unimode food webs
ترجمه فارسی عنوان
شاخص تفکیک گره به تازگی پیشنهاد شده، مناسب برای تجزیه و تحلیل شبکه های مواد غذایی unimode نیست
کلمات کلیدی
تجزیه و تحلیل شبکه؛ ماتریس مجاورت؛ نظریه گراف. سطوح تغذیه‌ای؛ سیستم های پیچیده
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


• Veech (2013)’s co-occurrence model is problematic for analysing unimode food webs.
• The problem is the number of species in the network available for being neighbors.
• That is, species are not independent from each other in unimode networks.
• A correct model is proposed for unimode networks.
• Both models behave distinctively for nested unimode network with generalists.

Strona and Veech (2015) developed a new node segregation (or node overlap) index for analysing ecological network structure based on the Veech (2013)’s species co-occurrence probabilistic model, which was originally applied to species-site matrices. However, a species-site matrix for analysing species co-occurrence patterns and an adjacency matrix for characterising unimode network structures are different. Directly applying Veech’s species co-occurrence probabilistic model to adjacency matrices in unimode food webs is problematic. The central critical problem is related to the number of free species (or nodes/vertices) in the unimode network that can be the neighbors (have links to connect) of a focused species or a focused pair of species. This number is typically less than the total number of species in real food webs. That is, species are not independent from each other in unimode networks. For a simple undirected unimode network without self-loops, based on the criterion whether there is a link between two species for a focused pair, a correct probabilistic model is developed to accurately compute the probability of observing some shared neighbors for a pair of species in the network. Numerical simulation show that the node overlap calculated using the correct and original probabilistic models present remarkable differences, especially when a unimode network is nested and contains generalists. In summary, The correct probabilistic model should be used if ones want Strona and Veech (2015)’s node segregation index to work for unimode food webs.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Complexity - Volume 26, June 2016, Pages 89–94
نویسندگان
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