Wyniki wyszukiwania

1

Diving behavior reduces genera richness of lice [Insecta, Phthiraptera] of mammals

100%

Felso B., Rozsa L.

Acta Parasitologica

|

2007

|

tom 52

|

nr 1

Lice of mammals spend the entire life cycle in the host hair, thus, the microclimate found near the mammal skin is likely to influence the structure of louse communities. Here we use a comparative approach to examine the effect of mammals’ diving behavior on the taxonomic richness of their lice. We compared the mean genera richness of lice, and — as potential confounding variables — the mean species richness of host, and the mean body mass of host between diving clades and their non-diving sister clades. Louse genera richness was significantly lower in clades of aquatic mammals than on their non-diving sister clades. Host species richness was not significantly different between these clades. Body mass was significantly higher in clades of aquatic mammals, however, the direction of this difference cannot explain the difference in parasite taxonomic richness. This study suggests that mammals’ diving behavior can effectively shape their ectoparasite communities.

2

Dive types and circadian behaviour patterns of Saimaa ringed seals Phoca hispida saimensis during the open-water season

84%

Kunnasranta M., Hyvarinen H., Hakkinen J., Koskela J. T.

Acta Theriologica

|

2002

|

tom 47

|

nr 1

Diving and circadian behaviour patterns of 7 free-ranging Saimaa ringed seals Phoca hispida saimensis Nordquist, 1899 were examined by VHF-radiotelemetry during open-water seasons between May and November in Lake Saimaa, eastern Finland. The mean recorded dive duration ranged from 2.8 to 6.5 min, with a maximum of 21 min. The mean dive depth ranged from 9.8 to 15.7 m, with maximum of 39.6 m. The maximum dive depth of each seal was limited by water depth in the study area. The dive depths were positively correlated with dive duration and body mass of the seal. Five different dive types were defined, as based on their depth-time characteristics, each falling into one of the three functional categories: travelling, feeding, and resting. Long duration diving bouts occurred mostly at night and were presumed to be resting dives. Saimaa ringed seals exhibited a circadian pattern of haul-out behaviour that shifted seasonally. During molting (May-June) the seals hauled-out both day and night, but later in summer haul-out was more frequent at night.

3

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Decompression syndrome and diving behavior in Odontochelys, the first turtle

67%

Rothschild B. M., Naples V.

Acta Palaeontologica Polonica

|

2015

|

tom 60

|

nr 1

Odontochelys semitestacea, the oldest known turtle, from the Late Triassic of China, shows a pathology. Sharply defined, focal depressions were noted on the articular surfaces of both humeri, documenting avascular necrosis. Diving habits of Mesozoic marine reptiles have been characterized on the basis of this localized form of bone death attributed to decompression syndrome. Pursuit by a predator was likely the cause of dangerously rapid depth changes by swimming turtles. The prevalence of avascular necrosis decreased geometrically from the Cretaceous to the Pleistocene. This study suggests that the habit of repetitive diving in turtles was already present in the Late Triassic, but that protective physiological and behavioral adaptations had not yet evolved.

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Acta Parasitologica

1 Acta Theriologica

1 Felso B.

1 Hakkinen J.

1 Hyvarinen H.

1 Koskela J. T.

1 Kunnasranta M.

1 Naples V.

1 Rothschild B. M.

1 Rozsa L.

1 2015

1 2007

1 2002

Diving behavior reduces genera richness of lice [Insecta, Phthiraptera] of mammals

Dive types and circadian behaviour patterns of Saimaa ringed seals Phoca hispida saimensis during the open-water season

Decompression syndrome and diving behavior in Odontochelys, the first turtle