scholarly journals Role of Crassicauda sp. in natural mortality of pantropical spotted dolphins Stenella attenuata: a reassessment

2014 ◽  
Vol 108 (1) ◽  
pp. 83-89 ◽  
Author(s):  
JA Balbuena ◽  
A Simpkin
Keyword(s):  
Natural Mortality ◽  
Stenella Attenuata

scholarly journals Honeybee lifespan: the critical role of pre-foraging stage

2020 ◽  
Vol 7 (11) ◽  
pp. 200998
Author(s):  
Alberto Prado ◽  
Fabrice Requier ◽  
Didier Crauser ◽  
Yves Le Conte ◽  
Vincent Bretagnolle ◽  
...  
Keyword(s):  
Critical Role ◽  
Natural Mortality ◽  
Anthropogenic Pressures ◽  
Mortality Risks ◽  
Flight Experience ◽  
The Impact ◽  
Monitoring Devices ◽  
Foraging Flight ◽  
Orientation Flights

Assessing the various anthropogenic pressures imposed on honeybees requires characterizing the patterns and drivers of natural mortality. Using automated lifelong individual monitoring devices, we monitored worker bees in different geographical, seasonal and colony contexts creating a broad range of hive conditions. We measured their life-history traits and notably assessed whether lifespan is influenced by pre-foraging flight experience. Our results show that the age at the first flight and onset of foraging are critical factors that determine, to a large extent, lifespan. Most importantly, our results indicate that a large proportion (40%) of the bees die during pre-foraging stage, and for those surviving, the elapsed time and flight experience between the first flight and the onset of foraging is of paramount importance to maximize the number of days spent foraging. Once in the foraging stage, individuals experience a constant mortality risk of 9% and 36% per hour of foraging and per foraging day, respectively. In conclusion, the pre-foraging stage during which bees perform orientation flights is a critical driver of bee lifespan. We believe these data on the natural mortality risks in honeybee workers will help assess the impact of anthropogenic pressures on bees.

scholarly journals Increased mortality among people with anxiety disorders: total population study

2016 ◽  
Vol 209 (3) ◽  
pp. 216-221 ◽  
Author(s):  
Sandra M. Meier ◽  
Manuel Mattheisen ◽  
Ole Mors ◽  
Preben B. Mortensen ◽  
Thomas M. Laursen ◽  
...  
Keyword(s):  
Anxiety Disorders ◽  
Mortality Risk ◽  
Disease Burden ◽  
Total Population ◽  
Common Mental Disorders ◽  
Natural Mortality ◽  
Risk Of Death ◽  
Mortality Rate Ratio

BackgroundAnxiety disorders and depression are the most common mental disorders worldwide and have a striking impact on global disease burden. Although depression has consistently been found to increase mortality; the role of anxiety disorders in predicting mortality risk is unclear.AimsTo assess mortality risk in people with anxiety disorders.MethodWe used nationwide Danish register data to conduct a prospective cohort study with over 30 million person-years of follow-up.ResultsIn total, 1066 (2.1%) people with anxiety disorders died during an average follow-up of 9.7 years. The risk of death by natural and unnatural causes was significantly higher among individuals with anxiety disorders (natural mortality rate ratio (MRR) = 1.39, 95% CI 1.28–1.51; unnatural MRR= 2.46, 95% CI 2.20–2.73) compared with the general population. Of those who died from unnatural causes, 16.5% had comorbid diagnoses of depression (MRR = 11.72, 95% CI 10.11–13.51).ConclusionsAnxiety disorders significantly increased mortality risk. Comorbidity of anxiety disorders and depression played an important part in the increased mortality.

Natural mortality, growth parameters, and environmental temperature in fishes revisited

2007 ◽  
Vol 64 (2) ◽  
pp. 249-255 ◽  
Author(s):  
David Griffiths ◽  
Chris Harrod
Keyword(s):  
Environmental Temperature ◽  
Growth Parameters ◽  
Mortality Rates ◽  
Ecological Effects ◽  
Path Model ◽  
Lower Mortality ◽  
Natural Mortality ◽  
Reef Habitat ◽  
Morphological Defences

Pauly (1980. J. Cons. Int. Explor. Mer, 39: 175–192) showed that natural mortality rates in fish could be predicted from body growth parameters and environmental temperature but found no evidence for ecological or taxonomic influences. Using an updated database and techniques that avoid some of the earlier analytical problems, we confirm Pauly's conclusion that mortality is correlated with growth and temperature. A path model supports the role of ecological effects on mortality. A phylogenetic effect is also apparent: perciform fishes occupy warmer environments than other species, but in the predator-rich reef habitat they suffer much lower mortality rates. Species that are cryptic or hide in burrows or have morphological defences against predators show the lowest mortality rates.

Covariation between grey seal (Halichoerus grypus) abundance and natural mortality of cod (Gadus morhua) in the southern Gulf of St. Lawrence

2005 ◽  
Vol 62 (9) ◽  
pp. 1991-2000 ◽  
Author(s):  
G A Chouinard ◽  
D P Swain ◽  
M O Hammill ◽  
G A Poirier
Keyword(s):  
Gadus Morhua ◽  
Atlantic Cod ◽  
Population Analysis ◽  
Halichoerus Grypus ◽  
Natural Mortality ◽  
Grey Seal ◽  
Synthetic Populations ◽  
Time Period ◽  
Abundance Indices

More than 10 years after the collapse of Atlantic cod (Gadus morhua) fisheries in Canada, the role of increased seal populations in the decline and lack of recovery of the stocks continues to be discussed. Using removals and abundance indices from synthetic populations, we found that sequential population analysis can uncover trends in natural mortality. We used this approach to examine variation in natural mortality (M) of southern Gulf of St. Lawrence cod. M increased from the late 1970s to the mid-1990s but declined slightly recently. Results were consistent with previous work indicating that M increased in the 1980s. Changes in estimated M for this cod stock matched fluctuations in grey seal (Halichoerus grypus) abundance. The increase in grey seal abundance from the late 1970s to the mid-1990s corresponded with the increase in estimated M of cod over this time period. The correspondence between seal abundance and M of cod supports the hypothesis that seal predation may be a cause of increased M. However, the diet information available suggests that seals consume mainly juvenile cod, whereas our evidence for an increase in M is for larger cod (ages 3 years and older).

Role of Natural Mortality in Boll Weevil (Coleoptera: Curculionidae) Management Programs

1990 ◽  
Vol 83 (1) ◽  
pp. 1-7 ◽  
Author(s):  
M. M. Sturm ◽  
W. L. Sterling ◽  
A. W. Hartstack
Keyword(s):  
Boll Weevil ◽  
Natural Mortality

scholarly journals Avoidance within a changing assessment paradigm for Mediterranean Hake stocks

2009 ◽  
Vol 10 (1) ◽  
pp. 125 ◽  
Author(s):  
S. RAGONESE
Keyword(s):  
Growth Rates ◽  
Reference Point ◽  
Present Note ◽  
The Other ◽  
Natural Mortality ◽  
Short Term ◽  
Merluccius Merluccius ◽  
Recovery Plan ◽  
Large Size

The Mediterranean hake Merluccius merluccius L., 1758, is the emblem of the so-called Mediterranean demersal fisheries paradox, showing a persistent, although stable, status of growth overexploitation and an impressive gap between current and any biological reference point. Almost full avoidance capability of large size females to bottom trawls, higher overall growth rates than previously believed and higher natural mortality in juveniles than adult, were considered among the most plausible explanation factors of such persistence. In the present note, arguments are illustrated to raise some concern about avoidance and highlight the important role of the other factors in improving assessments and launching a short term recovery plan for Mediterranean Hake stocks which is more acceptable to fishermen.

A novel approach for estimation of the natural mortality of the common whelk, Buccinum undatum (L.) and role of hermit crabs in its shell turnover

2016 ◽  
Vol 183 ◽  
pp. 146-154 ◽  
Author(s):  
V. Laptikhovsky ◽  
C. Barrett ◽  
C. Firmin ◽  
P. Hollyman ◽  
A. Lawler ◽  
...  
Keyword(s):  
Hermit Crabs ◽  
Natural Mortality ◽  
Buccinum Undatum ◽  
Novel Approach ◽  
The Common

Role of a Nematode in Natural Mortality of Spotted Dolphins

1980 ◽  
Vol 44 (4) ◽  
pp. 960 ◽  
Author(s):  
William F. Perrin ◽  
Joseph E. Powers
Keyword(s):  
Natural Mortality
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