Seasonal changes in bacteria and phytoplankton biomass control the condition index of the demosponge Halichondria panicea in temperate Danish waters

2019 ◽  
Vol 608 ◽  
pp. 119-132 ◽  
Author(s):  
F Lüskow ◽  
HU Riisgård ◽  
V Solovyeva ◽  
JR Brewer
Keyword(s):  
Seasonal Changes ◽  
Phytoplankton Biomass ◽  
Condition Index ◽  
Halichondria Panicea ◽  
Biomass Control

scholarly journals Development of a noninvasive photograph-based method for the evaluation of body condition in free-ranging brown bears

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e9982
Author(s):  
Yuri Shirane ◽  
Fumihiko Mori ◽  
Masami Yamanaka ◽  
Masanao Nakanishi ◽  
Tsuyoshi Ishinazaka ◽  
...  
Keyword(s):  
Body Condition ◽  
Seasonal Changes ◽  
Ursus Arctos ◽  
Accurate Method ◽  
Condition Index ◽  
The Body ◽  
Length Ratio ◽  
Brown Bears ◽  
Practical Applications ◽  
Free Ranging

Body condition is an important determinant of health, and its evaluation has practical applications for the conservation and management of mammals. We developed a noninvasive method that uses photographs to assess the body condition of free-ranging brown bears (Ursus arctos) in the Shiretoko Peninsula, Hokkaido, Japan. First, we weighed and measured 476 bears captured during 1998–2017 and calculated their body condition index (BCI) based on residuals from the regression of body mass against body length. BCI showed seasonal changes and was lower in spring and summer than in autumn. The torso height:body length ratio was strongly correlated with BCI, which suggests that it can be used as an indicator of body condition. Second, we examined the precision of photograph-based measurements using an identifiable bear in the Rusha area, a special wildlife protection area on the peninsula. A total of 220 lateral photographs of this bear were taken September 24–26, 2017, and classified according to bear posture. The torso height:body/torso length ratio was calculated with four measurement methods and compared among bear postures in the photographs. The results showed torso height:horizontal torso length (TH:HTL) to be the indicator that could be applied to photographs of the most diverse postures, and its coefficient of variation for measurements was <5%. In addition, when analyzing photographs of this bear taken from June to October during 2016–2018, TH:HTL was significantly higher in autumn than in spring/summer, which indicates that this ratio reflects seasonal changes in body condition in wild bears. Third, we calculated BCI from actual measurements of seven females captured in the Rusha area and TH:HTL from photographs of the same individuals. We found a significant positive relationship between TH:HTL and BCI, which suggests that the body condition of brown bears can be estimated with high accuracy based on photographs. Our simple and accurate method is useful for monitoring bear body condition repeatedly over the years and contributes to further investigation of the relationships among body condition, food habits, and reproductive success.

scholarly journals Seasonal changes in phytoplankton biomass on the western Agulhas Bank, South Africa

1999 ◽  
Vol 21 (1) ◽  
pp. 217-233 ◽  
Author(s):  
B. A. Mitchell-Innes ◽  
A. J. Richardson ◽  
S. J. Painting
Keyword(s):  
South Africa ◽  
Seasonal Changes ◽  
Phytoplankton Biomass

scholarly journals Long-Term and Seasonal Changes in Nutrients, Phytoplankton Biomass, and Dissolved Oxygen in Deep Bay, Hong Kong

2009 ◽  
Vol 33 (2) ◽  
pp. 399-416 ◽  
Author(s):  
Jie Xu ◽  
Kedong Yin ◽  
Joseph H. W. Lee ◽  
Hongbin Liu ◽  
Alvin Y. T. Ho ◽  
...  
Keyword(s):  
Hong Kong ◽  
Dissolved Oxygen ◽  
Seasonal Changes ◽  
Phytoplankton Biomass ◽  
Deep Bay
Sign in / Sign up

Export Citation Format

Share Document