scholarly journals Pitfall trap sampling bias depends on body mass, temperature, and trap number: insights from an individual‐based model

Ecosphere ◽  
2017 ◽  
Vol 8 (4) ◽  
Author(s):  
Jan Engel ◽  
Lionel Hertzog ◽  
Julia Tiede ◽  
Cameron Wagg ◽  
Anne Ebeling ◽  
...  
Keyword(s):  
Body Mass ◽  
Sampling Bias ◽  
Pitfall Trap ◽  
Individual Based Model ◽  
Mass Temperature

Body mass, temperature and cost of walking in polar bears

1982 ◽  
Vol 115 (4) ◽  
pp. 391-395 ◽  
Author(s):  
RICKI J. HURST ◽  
NILS A. ØRITSLAND ◽  
PAUL D. WATTS
Keyword(s):  
Body Mass ◽  
Polar Bears ◽  
Mass Temperature

scholarly journals Body mass, temperature, and depth shape the maximum intrinsic rate of population increase in sharks and rays

2021 ◽  
Author(s):  
Sebastián A. Pardo ◽  
Nicholas K. Dulvy
Keyword(s):  
Body Mass ◽  
Deep Sea ◽  
Extinction Risk ◽  
Deep Ocean ◽  
Intrinsic Rate ◽  
Population Increase ◽  
Theoretic Approach ◽  
Mass Scaling ◽  
Mass Temperature ◽  
Recovery Potential

AbstractAn important challenge in ecology is to understand variation in species’ maximum intrinsic rate of population increase,rmax, not least becausermaxunderpins our understanding of the limits of fishing, recovery potential, and ultimately extinction risk. Across many vertebrates, terrestrial and aquatic, body mass and environmental temperature across important correlatesrmaxacross species. In sharks and rays, specifically,rmaxis known be lower in larger species, but also in deep-sea ones. We use an information-theoretic approach that accounts for phylogenetic relatedness to evaluate the relative importance of body mass, temperature and depth onrmax. We show that both temperature and depth have separate effects on shark and rayrmaxestimates, such that species living in deeper waters have lowerrmax. Furthermore, temperature also correlates with changes in the mass scaling coefficient, suggesting that as body size increases, decreases inrmaxare much steeper for species in warmer waters. These findings suggest that there (as-yet understood) depth-related processes that limit the maximum rate at which populations can grow in deep sea sharks and rays. While the deep ocean is associated with colder temperatures, other factors that are independent of temperature, such as food availability and physiological constraints, may influence the lowrmaxobserved in deep sea sharks and rays. Our study lays the foundation for predicting the intrinsic limit of fishing, recovery potential, and extinction risk species based on easily accessible environmental information such as temperature and depth, particularly for data-poor species.

Sampling bias affects the relationship between structural importance and species body mass in frugivore-plant interaction networks

2020 ◽  
Vol 44 ◽  
pp. 100870
Author(s):  
Juan Fernando Acevedo-Quintero ◽  
Romeo A. Saldaña-Vázquez ◽  
Eduardo Mendoza ◽  
Joan Gastón Zamora-Abrego
Keyword(s):  
Body Mass ◽  
Sampling Bias ◽  
Interaction Networks ◽  
Plant Interaction ◽  
Structural Importance ◽  
The Relationship

Population structure, body mass, activity, and orientation of an aquatic snake (Seminatrix pygaea) during a drought

1993 ◽  
Vol 71 (7) ◽  
pp. 1281-1288 ◽  
Author(s):  
C. Kenneth Dodd Jr.
Keyword(s):  
Body Mass ◽  
Tail Length ◽  
Weather Conditions ◽  
Pitfall Trap ◽  
Temporary Ponds ◽  
Temporary Pond ◽  
Central Florida ◽  
Sampling Regime ◽  
Large Water ◽  
Seminatrix Pygaea

The snout – vent length, tail length, weight, sex, activity, and orientation of a population of swamp snakes (Seminatrix pygaea) in north – central Florida were recorded from 1985 through 1990. A small temporary pond was monitored for 1343 days, using a drift fence – pitfall trap sampling regime. I captured 123 different snakes, plus 45 recaptures. Juveniles comprised 89% of the snakes at the pond. Females were generally longer and weighed more than males, although regression analysis showed no differences between the sexes in the relationship of length versus wet body mass. Males had longer tails than females. The sex ratio of snakes with a snout – vent length of more than 150 mm was 1:1. Activity occurred throughout the year but peaked during summer. Hydroperiod and weather conditions did not appear to influence snake activity. During the latter years of the study, a regional drought that began in the mid-1980s became quite severe. However, drought had little direct effect on overland migration or body condition but caused snakes to leave or to shorten the amount of time they spent within the pond basin. Snakes immigrated and emigrated nonrandomly; orientation was directed to and from the nearest large water body. Certain temporary ponds may comprise developmental habitat for Seminatrix pygaea. The dynamic wet – dry climatic cycles in southeastern North America may lead to the formation of metapopulations in some aquatic snakes.

Oxygen consumption of the ascidianStyela clavain relation to body mass, temperature and salinity

2008 ◽  
Vol 39 (14) ◽  
pp. 1562-1568 ◽  
Author(s):  
Jiang Ai-li ◽  
Guo Jin-li ◽  
Cai Wen-gui ◽  
Wang Chang-hai
Keyword(s):  
Oxygen Consumption ◽  
Body Mass ◽  
Mass Temperature
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