Comparison of shorebird abundance and foraging rate estimates from footprints, fecal droppings and trail cameras

Wader Study ◽  
2020 ◽  
Vol 127 (1) ◽  
Author(s):  
Rachel Canham
Keyword(s):  
Foraging Rate ◽  
Trail Cameras

scholarly journals Wildlife Use of Drainage Structures Under 2 Sections of Federal Highway 2 in the Sky Island Region of Northeastern Sonora, Mexico

2021 ◽  
Vol 14 ◽  
pp. 117862212098872
Author(s):  
Mirna Manteca-Rodríguez ◽  
Ricardo E Félix-Burruel ◽  
Cecilia Aguilar-Morales ◽  
Juan Carlos Bravo ◽  
Myles Traphagen ◽  
...  
Keyword(s):  
Quality Index ◽  
Black Bear ◽  
Island Region ◽  
Wildlife Use ◽  
Field Assessment ◽  
Federal Highway ◽  
Wildlife Migration ◽  
Trail Cameras ◽  
Sky Island ◽  
Wildlife Mortality

Roads and highways are 1 of the most significant obstacles affecting wildlife movement by fragmenting habitat, altering wildlife migration and use of habitat, while also being a danger to wildlife and humans caused by wildlife-vehicle interactions. To mitigate wildlife mortality on highway sections and to minimize death and injury to motorists as well, road ecologists have proposed structures adapted for the safe passage of wildlife across roads. In this study, photographic sampling was conducted using trail cameras to quantify wildlife activity and use of existing culverts, bridges, and drainages within 2 separate sections of Mexico Federal Highway 2 where previous field assessment had observed high levels of activity. These sections are important areas for the conservation of wildlife, and they are known to be biological corridors for rare species of concern such as jaguar, black bear, and ocelot. The trail cameras were operated for 1 year to document the annual cycle of wildlife movement through the area. With the photographs obtained, a database was created containing the information from each wildlife-culvert interaction. Prior to sampling, an inventory of existing culverts was conducted that measured height, width, volume, and surrounding habitat to assign a hypothesized use quality index. After testing for significant differences in use index among culverts, we recognized that all culverts were equally important for moving wildlife, and that there were no significant differences in the use of culverts by the quality index.

scholarly journals Potential of Small Culverts as Wildlife Passages on Forest Roads

2021 ◽  
Vol 13 (13) ◽  
pp. 7224
Author(s):  
Hsiang-Ling Chen ◽  
Erin E. Posthumus ◽  
John L. Koprowski
Keyword(s):  
Animal Movement ◽  
Small Dimension ◽  
Lynx Rufus ◽  
Tamiasciurus Hudsonicus ◽  
Red Squirrels ◽  
Forest Roads ◽  
Alternative Pathways ◽  
Slow Moving ◽  
Trail Cameras ◽  
Spermophilus Variegatus

Roads and traffic can cause animal mortality. Specifically, roads serve as barriers by impeding animal movement, resulting in demographic and genetic consequences. Drainage structures, such as culverts, can provide linkages between habitat patches. However, the potential of small culverts with diameters of <60 cm (e.g., wildlife passages that facilitate movement on forest roads) are relatively unknown. In this study, we used trail cameras to monitor the use of 14 small culverts, by mammals, along forest roads on Mt. Graham, home of the critically endangered Mt. Graham red squirrels (Tamiasciurus hudsonicus grahamensis), in southeastern Arizona, USA. From 2011 to 2013, we only recorded 20 completed road crossings through culverts. More than half of culvert uses were by striped skunks (Mephitis mephitis), followed by the rock squirrel (Spermophilus variegatus) and the bobcat (Lynx rufus). The Mt. Graham red squirrel was the only species that was common along the roads, but never crossed the roads. Culverts with higher usages were characterized by shorter culvert lengths and absence of accumulated soil inside the culverts. Our study shows that small-dimension drainage systems may provide alternative pathways for wildlife crossing roads, especially for slow moving and ground dwelling species. However, the potential of small culverts assisting wildlife crossings can only be maximized when culverts are accessible year-round.

Experimental functional response and inter-individual variation in foraging rate of teal (Anas crecca)

2007 ◽  
Vol 75 (1) ◽  
pp. 66-71 ◽  
Author(s):  
C. Arzel ◽  
M. Guillemain ◽  
D.B. Gurd ◽  
J. Elmberg ◽  
H. Fritz ◽  
...  
Keyword(s):  
Functional Response ◽  
Individual Variation ◽  
Anas Crecca ◽  
Foraging Rate

scholarly journals Feeding strategy of mackerel in the Norwegian Sea relative to currents, temperature, and prey

2015 ◽  
Vol 73 (4) ◽  
pp. 1127-1137 ◽  
Author(s):  
Leif Nøttestad ◽  
Justine Diaz ◽  
Hector Penã ◽  
Henrik Søiland ◽  
Geir Huse ◽  
...  
Keyword(s):  
Swimming Speed ◽  
Swimming Performance ◽  
Feeding Strategy ◽  
Near Field ◽  
Norwegian Sea ◽  
Swimming Direction ◽  
Atlantic Mackerel ◽  
The North ◽  
Foraging Rate ◽  
Feeding Resources

Abstract High abundance of Northeast Atlantic mackerel (Scomber scombrus L.), combined with limited food resources, may now force mackerel to enter new and productive regions in the northern Norwegian Sea. However, it is not known how mackerel exploit the spatially varying feeding resources, and their vertical distribution and swimming behaviour are also largely unknown. During an ecosystem survey in the Norwegian Sea during the summer feeding season, swimming direction, and speed of mackerel schools were recorded with high-frequency omnidirectional sonar in four different regions relative to currents, ambient temperature, and zooplankton. A total of 251 schools were tracked, and fish and zooplankton were sampled with pelagic trawl and WP-2 plankton net. Except for the southwest region, swimming direction of the tracked schools coincided with the prevailing northerly Atlantic current direction in the Norwegian Sea. Swimming with the current saves energy, and the current also provides a directional cue towards the most productive areas in the northern Norwegian Sea. Average mean swimming speed in all regions combined was ∼3.8 body lengths s−1. However, fish did not swim in a straight course, but often changed direction, suggesting active feeding in the near field. Fish were largest and swimming speed lowest in the northwest region which had the highest plankton concentrations and lowest temperature. Mackerel swam close to the surface at a depth of 8–39 m, with all schools staying above the thermocline in waters of at least 6°C. In surface waters, mackerel encounter improved foraging rate and swimming performance. Going with the flow until temperature is too low, based on an expectation of increasing foraging rate towards the north while utilizing available prey under way, could be a simple and robust feeding strategy for mackerel in the Norwegian Sea.

scholarly journals Foraging behavior of major insect pollinators on pumpkin, Cucurbita moschata (Duch.ex Lam)

2017 ◽  
Vol 9 (2) ◽  
pp. 1208-1213
Author(s):  
Lalita Lalita ◽  
Yogesh Kumar
Keyword(s):  
Honey Bee ◽  
Foraging Behavior ◽  
Activity Period ◽  
Field Crop ◽  
Cucurbita Moschata ◽  
Foraging Activity ◽  
Peak Period ◽  
Insect Pollinators ◽  
Foraging Rate ◽  
The Mean

Foraging activity period of different honey bee species on C. moschata (C-1076) flowers at different day hours during August-September (2013) revealed that A. dorsata, A. mellifera, A. cerana and A. florea initiated their activity early in the morning at 0530, 0615, 0625 and 0630 h, respectively and stopped their activity at 1030, 1020, 1025 and 1030 h of the day, respectively while on C. moschata (C-1106, A. dorsata, A. mellifera, A. cerana and A. florea initiated their activity early in the morning at 0535, 0615, 0620 and 0625 h, respectively and ceased their activity at 1045, 1025, 1015 and 1040 h of the day, respectively. The mean foraging speed (time spent per flower) in seconds on flowers of pumpkin (C-1106) was maximum of A. florea (181.72), followed by A. mellifera (7.15), A. cerana (6.05) and A. dorsata spent least time (5.83) and in pumpkin (C-1076), foraging speed was maximum in case of A. florea (178.71), followed by A. mellifera (7.63), A. cerana (6.24) and A. dorsata spent least time (6.06). The mean foraging rate (flowers visited per minute) on flowers of pumpkin (C-1106) was maximum in case of A. dorsata (5.13), followed by A. cerana (4.30), A. mellifera (4.16) and A. florea visited least flower (0.32) and in pumpkin (C-1076), foraging rate was maximum in case of A. dorsata (4.96), followed by A. cerana (4.19), A. mellifera (4.02) and A. florea visited least flower (0.33). Present study advises the farmers that they should not apply the pesticide when the activityof honey bee is on the peak period because pesticides application at the time of bee activity in the field crop causes mortality of bees.

scholarly journals Foraging behavior of major insect pollinators on Pumpkin, Cucurbitamoschata (Duch.ex Lam)

2017 ◽  
Vol 9 (3) ◽  
pp. 1603-1607
Author(s):  
Lalita Lalita ◽  
Yogesh Kumar
Keyword(s):  
Honey Bee ◽  
Foraging Behavior ◽  
Activity Period ◽  
Field Crop ◽  
Foraging Activity ◽  
Peak Period ◽  
Insect Pollinators ◽  
Foraging Rate ◽  
The Mean

Foraging activity period of different honey bee species on C. moschata (C-1076) flowers at different day hours during August-September (2013) revealed that A. dorsata, A. mellifera, A. cerana and A. florea initiated their activity early in the morning at 0530, 0615, 0625 and 0630 h, respectively and stopped their activity at 1030, 1020, 1025 and 1030 h of the day, respectively while on C. moschata (C-1106, A. dorsata, A. mellifera, A. cerana and A. florea initiated their activity early in the morning at 0535, 0615, 0620 and 0625 h, respectively and ceased their activity at 1045, 1025, 1015 and 1040 h of the day, respectively. The mean foraging speed (time spent per flower) in seconds on flowers of pumpkin (C-1106) was maximum of A. florea (181.72), followed by A. mellifera (7.15), A. cerana (6.05) and A. dorsata spent least time (5.83) and in pumpkin (C-1076), foraging speed was maximum in case of A. florea (178.71), followed by A. mellifera (7.63), A. cerana (6.24) and A. dorsata spent least time (6.06). The mean foraging rate (flowers visited per minute) on flowers of pumpkin (C-1106) was maximum in case of A. dorsata (5.13), followed by A. cerana (4.30), A. mellifera (4.16) and A. florea visited least flower (0.32) and in pumpkin (C-1076), foraging rate was maximum in case of A. dorsata (4.96), followed by A. cerana (4.19), A. mellifera (4.02) and A. florea visited least flower (0.33). Present study advises the farmers that they should not apply the pesticide when the activity of honey bee is on the peak period because pesticides application at the time of bee activity in the field crop causes mortality of bees.

scholarly journals COVID-19 Restrictions in a Nature Reserve Reveal the Costs of Human Presence for the Threatened Nubian Ibex (Capra nubiana)

2021 ◽  
Vol 9 ◽  
Author(s):  
Yuval Zukerman ◽  
Zehava Sigal ◽  
Oded Berger-Tal
Keyword(s):  
Water Source ◽  
Nature Reserves ◽  
Water Pool ◽  
Natural Habitats ◽  
Human Presence ◽  
Wildlife Species ◽  
Trail Cameras ◽  
The Impact ◽  
Preferred Hours ◽  
Rare Opportunity

The increasing pressure of ecotourism on wildlife in their natural habitats leads many wild animals to alter their behaviors. The restrictions issued in many places due to COVID-19 provide a rare opportunity to examine wildlife behavior in nature reserves with reduced human presence, and to reveal the impact of human visitation on the behaviors and fitness of local wildlife species. In 2019 and 2020 we placed trail cameras next to two natural springs in the Israeli Negev Desert, Ein-Avdat and Ein-Shaviv, located 9 km apart. Both sites serve as the main water source for local Nubian ibex (Capra nubiana) populations, but Ein-Avdat is situated within a popular national park into which visitors’ entrance was restricted due to COVID-19 regulations in 2020, while Ein-Shaviv is more remote and thus attracts only few visitors regardless of COVID-19 regulations. Our study revealed that during 2020, ibex in Ein-Avdat arrived to drink earlier in the day and the population’s Female:Kids ratio more than doubled. These changes were not observed in Ein-Shaviv. We found that the daily number of visitors in Ein-Avdat affected the arrival time of ibex to the water pool. We conclude that the reduced number of visitors to Ein-Avdat in 2020 compared to 2019 may have allowed ibex to arrive in preferred hours, and may have contributed to the increased kid-to-females ratio. Our study shows that behavioral adaptions to human visitation in nature reserves might carry a high fitness cost.

scholarly journals Assessing arrays of multiple trail cameras to detect North American mammals

PLoS ONE ◽  
2019 ◽  
Vol 14 (6) ◽  
pp. e0217543 ◽  
Author(s):  
Bryn E. Evans ◽  
Cory E. Mosby ◽  
Alessio Mortelliti
Keyword(s):  
North American ◽  
Trail Cameras
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