Six‐year population dynamics of seven passalid species in a humid tropical rainforest in B orneo

2021 ◽  
Author(s):  
Hiroto Ueno ◽  
Kunio Araya ◽  
Paulus Meleng ◽  
Clement Het Kaliang ◽  
Shoko Sakai ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Tropical Rainforest

scholarly journals Population Dynamics of Pometia for The Period of Post-Selective Logging in Tropical Rainforest, Southern Papua, Indonesia

2016 ◽  
Vol 8 (3) ◽  
pp. 321
Author(s):  
Agustinus Murdjoko ◽  
Djoko Marsono ◽  
Ronggo Sadono ◽  
Suwarno Hadisusanto
Keyword(s):  
Population Dynamics ◽  
Tropical Rainforest ◽  
Biology Education ◽  
Selective Logging ◽  
Composition And Structure ◽  
Significant Difference ◽  
Before And After ◽  
Permanent Sample Plot ◽  
Logged Forest ◽  
Species Composition And Structure

<p>Tropical rainforest changed in term of structure, composition and population, resulting from logging. One of target trees during logging is <em>Pometia</em>. Our goals of this research were to answer that (1) How were survival, growth, fecundity and population growth rate (λ) of <em>Pometia</em> within remnant stands?; (2) what were driving factors to explain population dynamics of <em>Pometia</em> within logged forest?. Data were derived from three hectares-permanent sample plot (PSP) in logged forest of PT Tunas Timber Lestari. Integral Projection Models (IPMs) were applied to analyze population dynamics. The study showed dynamically that probability of the individuals of <em>Pometia</em> survived in this area did not significantly differ among their size, while stands showed the significant difference between small and large individuals. The growth of both individuals of <em>Pometia</em> and stands varied significantly in different size. The probability of fecundity both <em>Pometia</em> and stands were significantly different among size. The population of <em>Pometia</em> has been increasing for about a decade as the population of all stands was growing as well. Moreover, the regular documentation of species composition and structure before and after logging is necessary as a control of biodiversity. Therefore, a proper protocol to monitor the biodiversity should be designed by government and disseminated it to logging companies.    </p><p><strong>How to Cite</strong></p><p>Murdjoko, A., Marsono, D., Sadono, R. &amp; Hadisusanto, S. (2016). Population Dynamics of Pometia for The Period of Post-Selective Logging in Tropical Rainforest, Southern Papua, Indonesia. <em>Biosaintifika: Journal of Biology &amp; Biology Education</em>, 8(3), 321-330. </p>

Persistence of giants: population dynamics of the limpet Scutellastra laticostata on rocky shores in Western Australia

2020 ◽  
Vol 646 ◽  
pp. 79-92
Author(s):  
RE Scheibling ◽  
R Black
Keyword(s):  
Population Dynamics ◽  
Western Australia ◽  
Size Structure ◽  
Survival Rates ◽  
Maximum Size ◽  
High Rate ◽  
Adult Survival ◽  
Rocky Shores ◽  
Adult Size ◽  
Decadal Time Scale

Population dynamics and life history traits of the ‘giant’ limpet Scutellastra laticostata on intertidal limestone platforms at Rottnest Island, Western Australia, were recorded by interannual (January/February) monitoring of limpet density and size structure, and relocation of marked individuals, at 3 locations over periods of 13-16 yr between 1993 and 2020. Limpet densities ranged from 4 to 9 ind. m-2 on wave-swept seaward margins of platforms at 2 locations and on a rocky notch at the landward margin of the platform at a third. Juvenile recruits (25-55 mm shell length) were present each year, usually at low densities (<1 m-2), but localized pulses of recruitment occurred in some years. Annual survival rates of marked limpets varied among sites and cohorts, ranging from 0.42 yr-1 at the notch to 0.79 and 0.87 yr-1 on the platforms. A mass mortality of limpets on the platforms occurred in 2003, likely mediated by thermal stress during daytime low tides, coincident with high air temperatures and calm seas. Juveniles grew rapidly to adult size within 2 yr. Asymptotic size (L∞, von Bertalanffy growth model) ranged from 89 to 97 mm, and maximum size from 100 to 113 mm, on platforms. Growth rate and maximum size were lower on the notch. Our empirical observations and simulation models suggest that these populations are relatively stable on a decadal time scale. The frequency and magnitude of recruitment pulses and high rate of adult survival provide considerable inertia, enabling persistence of these populations in the face of sporadic climatic extremes.

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