scholarly journals Who’s for dinner? Bird prey diversity and choice in the great evening bat, Ia io

2021 ◽  
Author(s):  
Lixin Gong ◽  
Biye Shi ◽  
Hui Wu ◽  
Jiang Feng ◽  
Tinglei Jiang
Keyword(s):  
2021 ◽  
Vol 7 (2) ◽  
pp. eabe4214
Author(s):  
Hae Jin Jeong ◽  
Hee Chang Kang ◽  
An Suk Lim ◽  
Se Hyeon Jang ◽  
Kitack Lee ◽  
...  

Microalgae fuel food webs and biogeochemical cycles of key elements in the ocean. What determines microalgal dominance in the ocean is a long-standing question. Red tide distribution data (spanning 1990 to 2019) show that mixotrophic dinoflagellates, capable of photosynthesis and predation together, were responsible for ~40% of the species forming red tides globally. Counterintuitively, the species with low or moderate growth rates but diverse prey including diatoms caused red tides globally. The ability of these dinoflagellates to trade off growth for prey diversity is another genetic factor critical to formation of red tides across diverse ocean conditions. This finding has profound implications for explaining the global dominance of particular microalgae, their key eco-evolutionary strategy, and prediction of harmful red tide outbreaks.


2018 ◽  
Vol 96 (5) ◽  
pp. 497-504 ◽  
Author(s):  
P.A. Byerly ◽  
R.C. Lonsinger ◽  
E.M. Gese ◽  
A.J. Kozlowski ◽  
L.P. Waits

Range expansions by generalists can alter communities and introduce competitive pressures on native species. In the Great Basin Desert, USA, coyotes (Canis latrans Say, 1823) have colonized and are now sympatric with native kit foxes (Vulpes macrotis Merriam, 1888). Since both species have similar diets, dietary partitioning may facilitate coexistence. We analyzed coyote and kit fox diets, then compared our results to an earlier study. Because populations are dynamic, we expected that decreases in prey or increases in predator abundance could alter dietary patterns. We found no significant changes in population-level prey diversity for kit foxes or coyotes, but found high levels of dietary overlap between species. We did detect a significant decrease in the relative importance of leporids (family Leporidae) in the diets of both canids, but they remained important for coyotes. The relative importance of small mammals was greater for kit foxes than coyotes, but their importance had not changed significantly over time. We detected significant declines in prey diversity per sample (scat-level dietary diversity) for both canids, suggesting that during a foraging event, individuals may encounter less diverse prey now than historically. These findings suggested that kit foxes and coyotes were not limited by prey, despite high dietary overlap.


1991 ◽  
Vol 69 (2) ◽  
pp. 504-511 ◽  
Author(s):  
Laurie J. Vitt

A field study on two populations of the tropical iguanid lizard Plica plica in the Brazilian Amazon revealed that this lowland forest species is diurnal, occurs on vertical smooth-barked trunks of the largest trees in the forest, and feeds mostly on ants. Comparisons between rainy season samples from Pará and dry season samples from Rondonia show that even though lizards ate, on average, the same number of prey, prey were larger in Rondonia and prey diversity was greater in Pará. Lizards sleep on tree trunks or similar surfaces when available, apparently leaving the trees only to deposit eggs. Clutches are deposited in palm litter and inside rotted palm trunks. Clutch size averages 2.9 ± 0.1 eggs and is significantly correlated with female snout–vent length. The reproductive season appears to be extended in that females produce at least two clutches. Relative clutch mass of females is low compared with that of other sit-and-wait foraging lizard species, and this, coupled with the flattened morphology, presumably reflects adaptations for maintaining the center of gravity near vertical smooth tree trunks.


Oecologia ◽  
2017 ◽  
Vol 184 (3) ◽  
pp. 653-661 ◽  
Author(s):  
Daniel Wohlgemuth ◽  
Joanna Filip ◽  
Helmut Hillebrand ◽  
Stefanie D. Moorthi

2020 ◽  
Vol 66 (1) ◽  
pp. 44-61 ◽  
Author(s):  
Javier Sánchez‐Hernández ◽  
Anders G. Finstad ◽  
Jo Vegar Arnekleiv ◽  
Gaute Kjærstad ◽  
Per‐Arne Amundsen

Ecology ◽  
2013 ◽  
Vol 94 (7) ◽  
pp. 1636-1646 ◽  
Author(s):  
Jarrett E. K. Byrnes ◽  
Bradley J. Cardinale ◽  
Daniel C. Reed

2010 ◽  
Vol 13 (2) ◽  
pp. 194-201 ◽  
Author(s):  
Kyle F. Edwards ◽  
Kristin M. Aquilino ◽  
Rebecca J. Best ◽  
Kirsten L. Sellheim ◽  
John J. Stachowicz
Keyword(s):  

2005 ◽  
Vol 56 (4) ◽  
pp. 395 ◽  
Author(s):  
J. Matías Braccini ◽  
Jorge E. Perez

Understanding the variation in the diet of skates is crucial for determining their roles in marine ecosystems. The diet of 458 sandskates, Psammobatis extenta, from Puerto Quequén, Argentina was quantified to determine whether there was geographical, sexual, ontogenetic, and/or seasonal variation in dietary composition. Cumulative prey-diversity curves reached a stable level at ~30 stomachs and thus the sample size was large enough to describe the overall diet of the sandskate. The diet comprised a variety of small invertebrates, suggesting that the sandskate is a secondary consumer (trophic level of 3.5). The most important prey items were gammarids, shrimps and, to a lesser extent, polychaete worms. A significant correlation was found between the diets of sandskates from south-eastern Brazil and Puerto Quequén, suggesting that in both locations they used similar resources and would have similar ecological roles. No difference was found between the diets of males and females, but ontogenetic and seasonal patterns were detected. Small sandskates preyed largely on gammarids and shrimps but consumed fewer polychaetes and brachyurans than larger individuals. In summer and winter, the most important prey item by number was gammarids, whereas the consumption of shrimps peaked in autumn. This ontogenetic and seasonal pattern indicates that large and small sandskates are versatile predators that can shift their diets in response to prey abundance.


eLife ◽  
2019 ◽  
Vol 8 ◽  
Author(s):  
David William Kikuchi ◽  
Anna Dornhaus ◽  
Vandana Gopeechund ◽  
Thomas N Sherratt

Warning signals displayed by defended prey are mimicked by both mutualistic (Müllerian) and parasitic (Batesian) species. Yet mimicry is often imperfect: why does selection not improve mimicry? Predators create selection on warning signals, so predator psychology is crucial to understanding mimicry. We conducted experiments where humans acted as predators in a virtual ecosystem to ask how prey diversity affects the way that predators categorize prey phenotypes as profitable or unprofitable. The phenotypic diversity of prey communities strongly affected predator categorization. Higher diversity increased the likelihood that predators would use a ‘key’ trait to form broad categories, even if it meant committing errors. Broad categorization favors the evolution of mimicry. Both species richness and evenness contributed significantly to this effect. This lets us view the behavioral and evolutionary processes leading to mimicry in light of classical community ecology. Broad categorization by receivers is also likely to affect other forms of signaling.


2019 ◽  
Vol 6 (1) ◽  
pp. 84-100
Author(s):  
Ashra Kunwar ◽  
Narayan Prasad Koju

Conflict between human and wildlife is one of the main threats to the continued survival of many species in different parts of the world, and is also a significant threat to local human populations. As human populations expand and natural habitats shrink, people and animals are increasingly coming into conflict over living space and food. People lose their crops, livestock, property, and sometimes even their lives. Initially, with the use of structured interviews and few key informant survey, 120 households were selected for questionnaire in which 25 were from victim’s family and 95 from Sandhikharka village and the city areas using both purposive and random sampling method. Key informant interviews were also taken with officers of Division forest office and active members of community forest. Similarly, to access the prey diversity, a total of 9 infrared cameras were installed. As the objective of the research, the result was obtained based on secondary and primary data with the use of structured interviews to quantify attitudes based on 5 questions with the given scores where the scores were added together. At the end, the ANOVA test was carried outwit the variances among the control variables influencing the attitude toward leopards while assessing the overall attitudes of people with those scores. The result discusses the mean attitude of illiterate people as negative (-1.03±0.14 SE) towards leopard. Also, overall mean attitude of literate people was negative (-1.19±0.17 SE). Total 6750 images were recorded during study period among them only single event of leopard was captured in the camera trap and 72 independent prey images were captured by infrared camera. Mongoose, Wild cat, Rabbit, Porcupine and barking deer were commonly recorded. Rest of photos recorded were human movement, suggesting less prey abundance and higher human activities in study area.PCA analysis regarding factors affecting leopard human conflict suggested that the distance from water source to local people, distance from toilet to home, land use change going on in the study area, scarcity of water source to wildlife inside the forest, distance to graze livestock are major factors having positive impact on human leopard conflict. 


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