Population dynamics and life history of Paratya australiensis Kemp, 1917 (Decapoda: Atyidae) in upland rainforest streams, south-eastern Queensland, Australia

Aspects of the life history and population dynamics of Paratya australiensis were examined in headwater streams of the Conondale Range, south-eastern Queensland, particularly in relation to spatial and temporal variation in temperature and flow dynamics. Breeding period and population structure at nine sites in three subcatchments were examined during three years of monthly sampling using a non-destructive, photographic method. Breeding was restricted to the warmer months of late spring and summer. Peak abundances of ovigerous females and release of larvae occurred earlier at warmer, lower-altitude sites than at cooler, upper-altitude sites. This is consistent with the general trend for seasonal breeding in temperate and subtropical species of atyids, and perennial breeding in tropical species, and suggests that the summer breeding period of P. australiensis was strongly influenced by temperature. In subtropical, south-eastern Queensland, larvae were released just before and during the wet season. Although populations were quite resilient, disturbance from high-flow events also shaped the life history. Hydrology modified the breeding period by influencing overall abundance and recruitment success and by favouring the early release of larvae before peak flows. The reasonably well defined seasonal cycle and synchronized development appear to result from the combined effects of temperature and hydrology.

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Distribution and life history of caridean shrimps in regulated lowland rivers in southern Australia

Marine and Freshwater Research ◽

10.1071/mf03126 ◽

2004 ◽

Vol 55 (3) ◽

pp. 295 ◽

Cited By ~ 19

Author(s):

A. J. Richardson ◽

J. E. Growns ◽

R. A. Cook

Keyword(s):

Life History ◽

Life Stages ◽

Lowland Rivers ◽

Flow Alteration ◽

Eastern Australia ◽

History Of ◽

Paratya Australiensis ◽

Juvenile Stages ◽

Shrimp Abundance ◽

Large Adult

Caridean shrimps are an integral component of lowland river ecosystems in south-eastern Australia, but their distributions may be affected by flow alteration. Monthly shrimp samples were collected from slackwaters in three hydrologically distinct sections of the heavily regulated Campaspe River and the less regulated Broken River for three consecutive years. The distributions of Paratya australiensis, Caridina mccullochi and Macrobrachium australiense, along with their life history in river sections with different hydrology are outlined. Paratya australiensis and M. australiense occurred in all sections, but C. mccullochi was absent from sections of the Campaspe River that received irrigation flows during summer/autumn. Shrimp larvae were most abundant in summer (December–February) and juvenile recruitment continued through to mid autumn (April). Breeding and recruitment of P. australiensis occurred for longer than other shrimps. Apart from large adult and berried M. australiense, all life stages of shrimps commonly occurred in slackwaters, particularly the larval and juvenile stages. Irrigation flows in summer/autumn probably adversely affect the size, extent and arrangement of slackwaters, at a time when they may be critical habitats for C. mccullochi larval development and recruitment. Dams and weirs in the Campaspe River may have influenced shrimp abundance and the timing of breeding.

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Population dynamics of Stenothoe valida Dana, 1852 (Amphipoda, Stenothoidae) at Cheongsapo beach of Busan, Republic of Korea

Crustaceana ◽

10.1163/15685403-bja10105 ◽

2021 ◽

Vol 94 (4) ◽

pp. 413-429

Author(s):

Ye Ji Lee ◽

Won Gyu Park

Keyword(s):

Population Dynamics ◽

Life History ◽

Sex Ratio ◽

Brood Size ◽

Ovigerous Female ◽

Seasonal Pattern ◽

Recruitment Rate ◽

Republic Of Korea ◽

Female Size ◽

History Of

Abstract The population dynamics of Stenothoe valida Dana, 1852 were studied at Cheongsapo beach of Busan, Republic of Korea, from March 2019 to March 2020. Sampling was conducted once a month at low tide during spring tides. Specimens were grouped by the cephalic length at 0.025 mm intervals, and classified into four categories: females, ovigerous females, males and juveniles. The sex ratio, defined as females : total males + females, exceeded 0.5 during most of the study period. Brood size was significantly coupled with ovigerous female size. Two to four cohorts appeared at each study period. New cohorts occurred at almost every sampling except in the samples Jun-2, and Nov-2. Life span was estimated at 1-2 months. The juvenile ratio, the ratio of ovigerous females, and the recruitment rate estimated by FiSAT were commonly high in summer and winter. The life history of S. valida was not coupled with water temperature, but had a strong seasonal pattern.

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Contrasting effects of climate change on seasonal survival of a hibernating mammal

Proceedings of the National Academy of Sciences ◽

10.1073/pnas.1918584117 ◽

2020 ◽

Vol 117 (30) ◽

pp. 18119-18126 ◽

Cited By ~ 3

Author(s):

Line S. Cordes ◽

Daniel T. Blumstein ◽

Kenneth B. Armitage ◽

Paul J. CaraDonna ◽

Dylan Z. Childs ◽

...

Keyword(s):

Climate Change ◽

Population Dynamics ◽

Life History ◽

Environmental Conditions ◽

Temporal Trends ◽

Life History Strategies ◽

Environmental Drivers ◽

Age Classes ◽

History Of ◽

Colorado Rocky Mountains

Seasonal environmental conditions shape the behavior and life history of virtually all organisms. Climate change is modifying these seasonal environmental conditions, which threatens to disrupt population dynamics. It is conceivable that climatic changes may be beneficial in one season but result in detrimental conditions in another because life-history strategies vary between these time periods. We analyzed the temporal trends in seasonal survival of yellow-bellied marmots (Marmota flaviventer) and explored the environmental drivers using a 40-y dataset from the Colorado Rocky Mountains (USA). Trends in survival revealed divergent seasonal patterns, which were similar across age-classes. Marmot survival declined during winter but generally increased during summer. Interestingly, different environmental factors appeared to drive survival trends across age-classes. Winter survival was largely driven by conditions during the preceding summer and the effect of continued climate change was likely to be mainly negative, whereas the likely outcome of continued climate change on summer survival was generally positive. This study illustrates that seasonal demographic responses need disentangling to accurately forecast the impacts of climate change on animal population dynamics.

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Notes on the Biology of some predacious Mites on Fruit Trees in south-eastern England

Bulletin of Entomological Research ◽

10.1017/s0007485300046654 ◽

1956 ◽

Vol 47 (2) ◽

pp. 205-214 ◽

Cited By ~ 26

Author(s):

Elsie Collyer

Keyword(s):

Life History ◽

Plant Tissue ◽

Fruit Trees ◽

Predacious Mites ◽

Apple Trees ◽

South Eastern ◽

Three Generations ◽

Phytophagous Mites ◽

History Of ◽

Considerable Length

A number of predacious mites of the PHYTOSEIINAE (family LAELAPTIDAE), found in south-eastern England, mostly in association with fruit trees, are listed. Certain measurements and other characters that are of value in separating species are given. The species found were: Typhlodromus tiliae Oudm., T. cucumeris Oudm., T. tiliarum Oudm., T. rhenanus (Oudm.), T. finlandicus (Oudm.), T. umbraticus Chant, T. massei Nesbitt, T. vitis Oudm., T. soleiger (Ribaga), Phytoseius macropilis (Banks) and two Amblyseius spp. Of these, T. tiliae, T. finlandicus and P. macropilis are normally abundant on apple trees, but only T. tiliae remains abundant on commercially-grown apple trees. For each species a list of plants on which it has been found is given.Details of the life-history of laboratory-reared mites are given and these, together with counts of field populations, show that three generations a year is normal.Predacious phytoseiine mites feed on several species of TETRANYCHIDAE, including Metatetranychus ulmi (Koch) and Tetranychus telarius (L.); when M. ulmi is supplied in adequate numbers, adults of T. tiliae consume 3 mites per day, the nymphs 2 mites per day, on an average. It is thought that they also feed on plant tissue, since individuals survived in the laboratory for a considerable length of time in the absence of phytophagous mites, though eggs were not laid.

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THE ECOLOGY AND LIFE HISTORY OF RETUSA OBTUSA (MONTAGU) (GASTROPODA, OPISTHOBRANCHIA)

Canadian Journal of Zoology ◽

10.1139/z67-051 ◽

1967 ◽

Vol 45 (4) ◽

pp. 397-405 ◽

Cited By ~ 5

Author(s):

S. Tyrell Smith

Keyword(s):

Life History ◽

Life Cycle ◽

Life Span ◽

High Tide ◽

Breeding Period ◽

Protandrous Hermaphrodite ◽

History Of ◽

Natural Breeding ◽

One Year ◽

Short Time

The habitat, diet, life history, and reproductive cycle of Retusa obtusa were investigated over a period of [Formula: see text] years in a population found in the Inner Harbour at Barry, Glamorgan, U.K. A technique was devised for extracting Retusa from the mud of this area. R. obtusa occurs in the topmost 3.5 cm of fine mud covering Barry harbor, which is immersed by the sea for only a short time at each high tide. The principal prey was found to be Hydrobia ulvae.The life cycle was found to be annual, the adults dying in spring, following the natural breeding season. Occasionally, a short extra breeding period occurs in the fall. The life span in no case greatly exceeded one year. Retusa is a protandrous hermaphrodite, and copulates in the fall. The eggs mature through the late fall and the winter, a few at a time, until oviposition occurs in the spring. The average number of eggs produced per individual was 33, deposited in 1–4 egg batches. Development is direct.

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The life history of a tropical dragonfly: Cora marina (Odonata: Polythoridae) in Guanacaste, Costa Rica

Journal of Tropical Ecology ◽

10.1017/s0266467400009792 ◽

1996 ◽

Vol 12 (4) ◽

pp. 573-581 ◽

Cited By ~ 11

Author(s):

Gordon Pritchard

Keyword(s):

Life History ◽

Costa Rica ◽

Hyporheic Zone ◽

Flight Period ◽

Low Oxygen ◽

Wet Season ◽

Oxygen Conditions ◽

History Of ◽

One Year ◽

Oviposition Sites

ABSTRACTThe life history of Cora marina was followed for one year in two permanent streams at 600 m elevation in Guanacaste National Park; Costa Rica. The water temperature was c. 21°C year-round, but there was a distinct wet-dry seasonality, very little rain falling from January to May. In both streams, C. marina was univoltine. Adults first appeared at the beginning of May and the flight period coincided with the wet season. The availability of water-soaked logs as oviposition sites probably restricts reproduction to the wet season. Eggs hatched from mid-July to December. Recruitment to subsequent larval instars was slow during the wet season but increased at the start of the dry season. Final-instar larvae were collected from March to October. Oviposition in logs above the stream and the ability to live in the low oxygen conditions of the hyporheic zone probably allow eggs and small larvae to survive wet season spates.El ciclo biológico de una libelula tropical: Cora marina (Odonata: Polythoridae) en Guanacaste, Costa Rica.

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