Challenges to the assessment of benthic populations and biodiversity as a result of rhythmic behaviour: Video solutions from cabled observatories
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Document typePart of book or chapter of book
Defense date2012-06-01
PublisherChapman & Hall/CRC
Rights accessRestricted access - publisher's policy
All rights reserved. This work is protected by the corresponding intellectual and industrial
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Abstract
All marine species studied thus far show rhythmic temporal patterns in their behavioural, physiological,
and molecular functions, which are collectively known as biological rhythms. Biological
rhythms are generated by biological clocks that time biological functions and are synchronized
by geophysical cycles, such as the solar light-dark
cycle and tidal cycle. On continental margins,
behavioural rhythms can be detected by diel (i.e., 24-hour based) or seasonal periodical trawling as
a consequence of massive inward and outward displacements of populations to and from the sample
areas. As a result, significant errors in population/stock and biodiversity assessments performed
by trawling may occur if timing of sampling is not taken into account. The increasing number of
cabled and permanent multiparametric seafloor observatories now allows direct, continuous, and
long-lasting
monitoring of benthic ecosystems and analysis in relation to several habitat cycles. This
review describes the adaptation of this technology to investigations of rhythmic behaviour by focusing
on automated video imaging. Diel fluctuations in the number of video-observed
individuals can
be used as a measure of average population rhythmic behaviour. The potential implementation of
automated video image analysis in relation to animal tracking and classification procedures based
on the combined use of morphometric tools and multivariate statistics is detailed in relation to
populational and community studies. Based on video cameras mounted at multiparametric cabled
observatories, an integrated time-series
analysis protocol using chronobiomedical procedures is
proposed to place video-recorded
bioinformation in an oceanographic context.
CitationAguzzi, J. [et al.]. Challenges to the assessment of benthic populations and biodiversity as a result of rhythmic behaviour: Video solutions from cabled observatories. A: "Oceanography and Marine Biology: An Annual Review, 2012". Chapman & Hall/CRC, 2012, p. 233-284.
ISBN9781439889985
Publisher versionhttp://www.crcpress.com/product/isbn/9781439889985
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